Daily rainfall, frost and wind for London against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
EC1A 1BB · 1 Sept 2025 – 30 Sept 2025
Rainfall over this period was 97% of the 10-year average for the same calendar window at this location. Conditions were broadly in line with typical for the time of year.
Rainfall vs 10-yr avg
97%
61 mm vs 63 mm typical
Rain days >5mm
2
typical: 3.8
Frost days
0
typical: 0.0
High-wind days
0
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Sept 2025 | 3.3 | 14.5 | 19.3 | 31 | |
| 2 Sept 2025 | 1.8 | 12.8 | 19.0 | 23 | |
| 3 Sept 2025 | 25.7 | 15.6 | 20.0 | 44 | wet |
| 4 Sept 2025 | 4.7 | 14.1 | 18.8 | 32 | |
| 5 Sept 2025 | 0.0 | 11.4 | 20.7 | 16 | |
| 6 Sept 2025 | 0.0 | 13.3 | 22.0 | 26 | |
| 7 Sept 2025 | 0.0 | 15.7 | 24.5 | 27 | |
| 8 Sept 2025 | 0.1 | 13.6 | 19.6 | 21 | |
| 9 Sept 2025 | 0.3 | 11.0 | 19.8 | 18 | |
| 10 Sept 2025 | 7.7 | 14.3 | 18.0 | 28 | wet |
| 11 Sept 2025 | 3.7 | 12.1 | 18.0 | 32 | |
| 12 Sept 2025 | 4.4 | 10.9 | 17.6 | 31 | |
| 13 Sept 2025 | 3.0 | 11.8 | 17.2 | 28 | |
| 14 Sept 2025 | 3.5 | 9.2 | 17.8 | 39 | |
| 15 Sept 2025 | 0.4 | 14.1 | 17.8 | 46 | |
| 16 Sept 2025 | 0.0 | 12.0 | 18.3 | 33 | |
| 17 Sept 2025 | 1.1 | 12.5 | 18.8 | 37 | |
| 18 Sept 2025 | 0.0 | 16.1 | 21.5 | 34 | |
| 19 Sept 2025 | 0.0 | 15.0 | 25.4 | 19 | |
| 20 Sept 2025 | 0.0 | 13.8 | 21.1 | 41 | |
| 21 Sept 2025 | 0.0 | 9.5 | 15.5 | 33 | |
| 22 Sept 2025 | 0.0 | 7.5 | 15.7 | 26 | |
| 23 Sept 2025 | 0.0 | 7.2 | 16.4 | 23 | |
| 24 Sept 2025 | 0.0 | 9.6 | 17.5 | 25 | |
| 25 Sept 2025 | 0.0 | 9.5 | 18.3 | 28 | |
| 26 Sept 2025 | 1.1 | 9.4 | 16.1 | 24 | |
| 27 Sept 2025 | 0.0 | 10.6 | 17.4 | 23 | |
| 28 Sept 2025 | 0.5 | 11.8 | 16.8 | 14 | |
| 29 Sept 2025 | 0.0 | 8.0 | 17.7 | 11 | |
| 30 Sept 2025 | 0.0 | 8.9 | 18.3 | 8 |
2 days with rainfall over 5 mm in this period.
Data: ERA5 reanalysis via Open-Meteo, taken at the nearest model grid point to the postcode — not a Met Office station record. Baselines are the mean of the same calendar months over the previous 10 years at this location. Whether conditions meet a contractual test (e.g. JCT “exceptionally adverse weather” or an NEC 1-in-10-year event) is a matter for the contract — this is a factual weather record, not advice.
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