14-day forecast
Review operation-specific advisory levels and drill into hourly conditions for flagged days.
Forecast and advisories →From bid to final account
Construction weather intelligence across the project lifecycle
Connect weather forecasts with planning trade activities, reviewing weather risks across sites, preparing early warnings and organising supporting delay evidence — for daily site work alongside tender planning and commercial review.
Five integrated tools
The 14-day forecast, 29 trade advisories, radar, multi-site views, tender allowances, early-warning tools and historical evidence support connected decisions from daily site work through commercial review.
Historical data
Retrieve past conditions for a selected project location and export supporting records.
Historical weather data →Time-extension evidence
Compare a selected month with a five- or ten-year benchmark and organise identified events.
Time-extension evidence →Tender planning
Estimate average unsuitable days by project month and assigned trade operation.
Tender planning tool →Why weather risk matters at tender →
Early warnings
Create an editable notice draft containing forecast conditions, anticipated impact and proposed mitigation.
Early-warning notices →Live site conditions
Wind, rain and snow at your location — right now
The map below shows animated wind flow and current precipitation at your approximate location using live weather data. The same overlay is available inside the platform for any project site worldwide — helping site teams understand the immediate environment around their site before committing crews.
- Animated arrows show live wind speed and direction
- Rain streaks and snow flakes animate when precipitation is active
- Powered by Open-Meteo real-time data, refreshed hourly
- Works for any construction site location worldwide
Weather: Open-Meteo · Map: OpenStreetMap · Location estimated from your IP address.
Rain radar example
See what's arriving at your site
This captured Melbourne sequence demonstrates the animated radar available inside the platform for any project location. Colour intensity shows rainfall rate from light drizzle through to heavy rain.
- Fixed Melbourne example recorded on 25 August 2026
- Two hours of captured radar observations
- Play, pause or scrub through recent frames
- Powered by RainViewer global radar network
Rain radar: RainViewer · Map: OpenStreetMap · Captured Melbourne example — the sequence remains unchanged for every visitor.
Configurable thresholds
Set alert conditions to match your project specifications
Every project has different operational limits — defined by the crane manufacturer, the welding procedure specification, the coating product data sheet or the contract method statement. The notifications system lets you configure project-specific alert thresholds so the platform flags the conditions that matter for your work, not generic defaults.
Wind and gust alerts
Set the wind speed and gust limits relevant to your crane configuration, scaffold design or structural welding procedure — and receive notification before forecast conditions reach your threshold.
Rainfall and humidity alerts
Configure rainfall intensity alerts for planned concrete pours, earthworks compaction, pipeline installation or coating application windows. Set humidity and dew point alerts for blasting, painting or waterproofing work.
Temperature alerts
Set minimum or maximum temperature alerts for concrete placement and curing, mortar setting, coating application or any temperature-sensitive site operation referenced in your specification.
Four stages. One platform.
Where do you fit in the project?
Construction weather affects every role from the estimator setting the tender allowance to the QS compiling the time-extension claim months later. Every stage is connected in a single location-based workflow — so the evidence you build on day one supports the claim at the end.
Stage 1
Price it
Tender team
Use ten years of location-specific historical data to calculate realistic unsuitable-day allowances by trade and project month. Avoid underpricing weather risk — and the P&G overruns that follow when the allowance runs out mid-programme.
Tender planning tool →Stage 2
Plan around it
Site manager
Check whether tomorrow's conditions are suitable for the planned operation before the crew mobilises. Green, Amber and Red advisory grading across 29 construction trades — concrete, craneage, roofing, earthworks and more — with a 14-day outlook.
Trade advisories →Stage 3
Protect the programme
Project manager
Issue contractual early-warning notices before adverse conditions arrive. Maintain the contemporaneous weather records that underpin any future delay claim. A 14-day forecast benchmarked against historical norms keeps you ahead of the programme.
Early warning notices →Stage 4
Review the evidence
QS & commercial team
Benchmark the affected project month against a five- or ten-year historical average, identify qualifying weather events and organise supporting evidence around the contract clause — NEC, JCT or FIDIC — for professional commercial and programme review.
Time-extension evidence tool →Weather intelligence — not a daily diary app
Construction-Weather.com connects weather forecasts with what happens next: planning trade activities, reviewing weather risks across sites, preparing early warnings and organising supporting delay evidence. It supports daily site work alongside tender planning and commercial review; outputs do not determine safety, legal entitlement or recovery.
- Trade-specific risk grading, not a generic rain warning
- Early warning notices generated from project and forecast data
- Time-extension evidence benchmarked against 5–10 years of historical records
- Tender planning tool linked to the same historical dataset
- Aligned to NEC3, NEC4, JCT and FIDIC contract conventions
US contractors
Working under AIA, ConsensusDocs or FAR contracts?
See how Construction Weather supports US weather delay documentation, bid planning and federal REAs.
Find your fit
Find the tools most relevant to your role
Construction weather affects every discipline — but differently. Each role guide focuses on the tools and workflows that matter most for your job, with guidance tailored to how weather risk shows up in your day-to-day decisions.
Site managers & supervisors
Check whether today's conditions are suitable for the planned operation before the crew mobilises. Green, Amber and Red risk grading across 29 construction trades — with the weather records that protect you when the programme slips.
Site manager guide → Project managersIssue contractual early-warning notices before adverse conditions arrive. Maintain the contemporaneous weather records that underpin any future delay claim and protect the programme against LD exposure.
Project manager guide → Quantity surveyors & commercial teamsBenchmark the affected project month against five or ten years of historical data. Organise supporting time-extension evidence framed around the contract clause — NEC, JCT or FIDIC — for qualified commercial and programme review.
QS guide → Tender teams & estimatorsCalculate realistic unsuitable-day allowances by trade and project month from ten years of location-specific historical data. Price the weather risk accurately at bid stage — before the P&G overruns begin.
Tender team guide →All sectors
Works across all construction sectors
Weather-related delays and EOT entitlements are not unique to building construction. Civil and infrastructure contractors face identical exposure — and the same contract mechanisms to manage it.
- Building construction — concrete frames, precast erection, structural steel, fitout and finishing trades
- Civil and earthworks — fill placement and compaction suspended by rain, cut-and-fill programmes, roading subbase and kerb work
- Pipeline and utilities — temperature and precipitation limits for joint welding, pipe coating and trench backfill
- Industrial plant — large-scale civil pours (tank bases, reactor foundations), structural welding under wind and humidity constraints
Weather-related EOT entitlements apply to civil contracts under any standard form — NEC4, FIDIC, JCT, AS 4000 or NZS 3910 — in exactly the same way as building contracts. The platform's threshold library covers earthworks, road surfacing and pipeline operations alongside standard building trades.
Live on the job
A daily planning tool for site teams — not just a contracts resource
Construction Weather is opened on site every morning. Before the crew mobilises, the site manager checks whether today's conditions — wind, rain, temperature, humidity — are suitable for the planned operation. The trade advisory returns a simple Green, Amber or Red decision with the reasoning behind it.
- Check any supported trade before committing the crew — 29 construction trades, including crane lifts, concrete pours, scaffold erection, roofing and earthworks, each use reviewed operation-specific thresholds and safeguards
- Plan the week ahead — the 14-day outlook shows which days are workable for each planned operation so you can sequence work around the weather, not react to it afterwards
- Drill into the hours that matter — amber and red days break down hourly conditions so you can judge whether the morning window is workable before the afternoon front arrives
- Live radar as an instant site check — animated rain radar and wind conditions at your site, inside the same platform you use for advisories and early warning notices
- Works in your browser at the site gate — follow the iOS Safari or Android browser home-screen steps below when your browser offers them
The 6am question — answered in seconds
Every site morning starts with a weather question about the planned work. Construction Weather gives a structured, trade-specific advisory against configured thresholds — not a general forecast or a safety authorisation. Green means the configured threshold is not breached; Amber means review the detail; Red means a threshold is breached and the competent site team must assess the work.
- Advisory checked against configured thresholds, not gut feel or a generic rain warning
- Advisory and forecast outputs can support a contemporaneous record for later time-extension review
- The forecast, the notice and the time-extension evidence tool all pull from the same project and location data
- If the week turns amber mid-programme, the early warning tool is one step away
Data needs context
Use weather data alongside the site record
On-site weather stations and gridded weather datasets answer different questions. When conditions are reviewed for a time-extension claim or adjudication, the source, location, timing, siting and contract requirements all need to be clear.
The problem with on-site hardware
- Calibration and siting — record when the device was calibrated, who maintained it and whether its placement represented the relevant work area
- Limited history — a sensor installed at project start may not cover earlier periods needed for a benchmark
- Gap risk — power failure, connectivity loss or equipment damage can create holes in the record
- Project-by-project setup — installation, calibration and retrieval need to be planned and documented
What a stated gridded source provides
- Stated source — the platform identifies the weather source and gives the team a basis to compare against contract requirements
- Historical comparison — archive data can provide a longer comparison period where the requested dates and parameters are available
- No site hardware required — the platform can provide location-based data without installing an instrument at each project
- Still needs checking — local effects, missing values and the distinction between gridded data and site conditions remain part of the review
The practical upshot: No weather source answers every contractual question on its own. Preserve the source and query context, then connect the weather record to site records, notices, affected activities and programme analysis before relying on it in a formal review.
Further reading
Not sure which type of platform you need?
Construction weather tools span four distinct categories — field workability apps, on-site hardware stations, enterprise alert systems and contractual workflow platforms. Each solves a different problem for a different user at a different stage of the project.
Read the platform guide →
A fair, category-by-category comparison — including where Construction Weather fits and where it does not.
Beta access
Free to use during the open beta
All five tools are available now at no cost. Use Construction Weather on live projects, give feedback through the survey inside the platform and lock in a lifetime discount when Pro launches.
Access the platform in your browser. See the iOS Safari and Android browser home-screen steps.
Mobile access
Keep the platform close at the site gate
Construction Weather is accessed in your browser. No native app download is required, and browser installation options can vary by device and browser.
iPhone or iPad — Safari
- Open Construction Weather in Safari.
- Tap Share.
- Choose Add to Home Screen, then confirm Add.
If the option is not shown, check that the page is open in Safari rather than an in-app browser.
Android — browser
- Open Construction Weather in your Android browser.
- Open the browser menu.
- Choose Install app or Add to Home screen when offered.
Menu labels and whether an install option appears depend on the browser.
Current public outputs include Excel, Word and PNG exports. There is no documented public integration API; use the platform's available exports rather than assuming an automated integration.
Common Questions
Platform FAQ
What construction contracts does Construction Weather support?
Construction Weather is designed for use on projects let under NEC3, NEC4, JCT and FIDIC contracts, where adverse weather clauses create entitlement to extension of time or additional cost. The platform's trade thresholds and time-extension evidence tools are aligned to how adverse weather is assessed under these standard forms. It is equally suitable for bespoke contracts that reference adverse or exceptional weather conditions.
What tools are included in the platform?
The platform includes five integrated tools: a 14-day trade forecast with operation-specific Green, Amber and Red advisories; a historical weather data retrieval tool; an EOT Evidence Generator that benchmarks a project month against five or ten years of historical data; a Tender Planning tool that calculates average unsuitable days by operation and project month; and an Early Warning Notice generator that produces editable draft notices from forecast data.
How is Construction Weather different from a standard weather app?
A standard weather app tells you it will rain. Construction Weather helps you assess how that rain — or wind, frost, heat or humidity — may affect the specific operation you have planned. Every tool is built around construction trade operations and contract processes rather than general weather presentation. Outputs are structured for construction decision-making: operational advisories, early warning notices and time-extension evidence documents, not forecasts designed for the general public.
Does Construction Weather cover all types of construction trades?
The platform covers 29 trade operations including crane and lifting, scaffold erection, steel erection, concrete placement, structural welding, painting and applied coatings, blasting and surface preparation, roofing and waterproofing, masonry, earthworks, road surfacing, piling, glazing and timber framing. Each trade has its own weather threshold set derived from published British Standards, NEC and JCT contract conventions, and CIOB and RICS guidance.
Is Construction Weather available on mobile?
Yes. Construction Weather is accessed in a browser. On iPhone, open the site in Safari, select Share, choose Add to Home Screen and confirm Add. On Android, open the site in your browser, open the browser menu and choose Install app or Add to Home screen when offered. Browser menus and availability can vary.
Can site managers use Construction Weather every morning for daily planning?
Yes — daily site planning is one of the platform's primary uses. Before mobilising the crew, a site manager checks whether that day's conditions are suitable for the planned operation. The trade advisory returns a Green, Amber or Red status against configured thresholds for wind, rain, temperature, frost and humidity; it is not a safety authorisation. Amber days break down hourly so you can judge whether a morning window is workable before an afternoon front arrives. The 14-day outlook lets you sequence the week's work around the forecast rather than react to it afterwards.
Why does Construction Weather use gridded weather data rather than relying on an on-site weather station?
Construction Weather uses Open-Meteo weather data: historical archive queries use ERA5 reanalysis from ECMWF, while recent and upcoming dates use forecast output. A radar view, where shown, is a separate recent precipitation observation product. These are location-based data outputs, not measurements taken at the construction site. Retain the source and query or issue time, check the contract's evidence requirements, and compare with station and project records where relevant.