Daily rainfall, frost and wind for Cardiff against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
CF10 1EP · 1 Sept 2025 – 30 Sept 2025
Rainfall over this period was 143% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 4 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
143%
152 mm vs 106 mm typical
Rain days >5mm
13
typical: 7.8
Frost days
0
typical: 0.0
High-wind days
4
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Sept 2025 | 7.8 | 14.3 | 18.1 | 36 | wet |
| 2 Sept 2025 | 4.1 | 13.4 | 19.3 | 25 | |
| 3 Sept 2025 | 15.2 | 15.1 | 18.5 | 42 | wet |
| 4 Sept 2025 | 9.8 | 12.5 | 17.4 | 33 | wet |
| 5 Sept 2025 | 0.2 | 12.0 | 18.4 | 21 | |
| 6 Sept 2025 | 0.0 | 14.0 | 20.9 | 35 | |
| 7 Sept 2025 | 5.5 | 14.2 | 19.9 | 37 | wet |
| 8 Sept 2025 | 3.1 | 12.4 | 16.5 | 23 | |
| 9 Sept 2025 | 9.7 | 13.0 | 17.2 | 30 | wet |
| 10 Sept 2025 | 12.1 | 13.6 | 17.1 | 35 | wet |
| 11 Sept 2025 | 13.7 | 10.9 | 15.4 | 49 | wet · wind |
| 12 Sept 2025 | 8.8 | 11.0 | 15.8 | 35 | wet |
| 13 Sept 2025 | 5.6 | 11.7 | 15.6 | 34 | wet |
| 14 Sept 2025 | 19.8 | 11.7 | 18.1 | 48 | wet · wind |
| 15 Sept 2025 | 5.5 | 13.7 | 16.1 | 59 | wet · wind |
| 16 Sept 2025 | 1.3 | 12.9 | 16.3 | 42 | |
| 17 Sept 2025 | 12.9 | 13.4 | 18.7 | 35 | wet |
| 18 Sept 2025 | 2.8 | 16.8 | 19.3 | 28 | |
| 19 Sept 2025 | 0.0 | 14.7 | 19.2 | 22 | |
| 20 Sept 2025 | 8.4 | 11.4 | 17.8 | 48 | wet · wind |
| 21 Sept 2025 | 0.1 | 8.5 | 14.2 | 22 | |
| 22 Sept 2025 | 0.0 | 6.6 | 14.7 | 18 | |
| 23 Sept 2025 | 0.0 | 6.4 | 15.4 | 17 | |
| 24 Sept 2025 | 0.0 | 8.1 | 15.9 | 23 | |
| 25 Sept 2025 | 0.0 | 8.5 | 17.0 | 23 | |
| 26 Sept 2025 | 0.0 | 7.3 | 15.3 | 18 | |
| 27 Sept 2025 | 4.2 | 11.4 | 16.4 | 27 | |
| 28 Sept 2025 | 1.0 | 9.4 | 17.1 | 19 | |
| 29 Sept 2025 | 0.0 | 6.4 | 15.6 | 10 | |
| 30 Sept 2025 | 0.0 | 7.8 | 15.3 | 11 |
13 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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