Daily rainfall, frost and wind for Swansea against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
SA1 1NW · 1 Aug 2025 – 31 Aug 2025
Rainfall over this period was 70% of the 10-year average for the same calendar window at this location. Conditions were drier than typical for the time of year.
Rainfall vs 10-yr avg
70%
83 mm vs 119 mm typical
Rain days >5mm
7
typical: 7.6
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 Aug 2025 | 0.3 | 12.9 | 18.2 | 32 | |
| 2 Aug 2025 | 0.2 | 10.7 | 20.7 | 24 | |
| 3 Aug 2025 | 1.9 | 14.1 | 23.0 | 28 | |
| 4 Aug 2025 | 8.1 | 15.2 | 20.9 | 40 | wet |
| 5 Aug 2025 | 0.0 | 13.1 | 18.5 | 35 | |
| 6 Aug 2025 | 0.0 | 11.2 | 18.8 | 17 | |
| 7 Aug 2025 | 4.8 | 15.6 | 19.1 | 36 | |
| 8 Aug 2025 | 0.1 | 13.6 | 19.4 | 24 | |
| 9 Aug 2025 | 0.5 | 15.3 | 20.0 | 32 | |
| 10 Aug 2025 | 0.2 | 14.0 | 22.5 | 17 | |
| 11 Aug 2025 | 0.0 | 13.7 | 25.5 | 19 | |
| 12 Aug 2025 | 0.4 | 17.5 | 29.6 | 21 | |
| 13 Aug 2025 | 0.3 | 16.7 | 21.4 | 16 | |
| 14 Aug 2025 | 4.8 | 17.2 | 21.8 | 29 | |
| 15 Aug 2025 | 0.0 | 14.0 | 25.5 | 17 | |
| 16 Aug 2025 | 0.0 | 17.6 | 25.2 | 24 | |
| 17 Aug 2025 | 0.0 | 13.3 | 24.7 | 25 | |
| 18 Aug 2025 | 0.0 | 16.0 | 22.2 | 28 | |
| 19 Aug 2025 | 0.0 | 15.0 | 22.1 | 21 | |
| 20 Aug 2025 | 0.0 | 13.9 | 19.4 | 22 | |
| 21 Aug 2025 | 0.0 | 11.4 | 20.0 | 17 | |
| 22 Aug 2025 | 0.0 | 10.5 | 21.6 | 20 | |
| 23 Aug 2025 | 0.0 | 11.9 | 21.9 | 15 | |
| 24 Aug 2025 | 0.0 | 14.3 | 24.3 | 21 | |
| 25 Aug 2025 | 0.0 | 15.3 | 26.3 | 34 | |
| 26 Aug 2025 | 5.1 | 16.1 | 19.7 | 30 | wet |
| 27 Aug 2025 | 6.2 | 15.2 | 19.1 | 33 | wet |
| 28 Aug 2025 | 18.8 | 13.4 | 16.3 | 32 | wet |
| 29 Aug 2025 | 14.7 | 13.7 | 18.1 | 28 | wet |
| 30 Aug 2025 | 10.8 | 13.5 | 18.3 | 41 | wet |
| 31 Aug 2025 | 6.0 | 13.7 | 17.0 | 38 | wet |
7 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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