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 May 2025 – 31 May 2025
Rainfall over this period was 65% 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
65%
58 mm vs 89 mm typical
Rain days >5mm
4
typical: 5.8
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 May 2025 | 0.0 | 10.0 | 24.6 | 15 | |
| 2 May 2025 | 0.2 | 12.1 | 19.6 | 21 | |
| 3 May 2025 | 0.4 | 10.2 | 19.8 | 26 | |
| 4 May 2025 | 1.3 | 8.5 | 13.6 | 16 | |
| 5 May 2025 | 0.3 | 4.5 | 13.2 | 26 | |
| 6 May 2025 | 0.0 | 4.4 | 15.3 | 15 | |
| 7 May 2025 | 0.2 | 6.7 | 17.7 | 25 | |
| 8 May 2025 | 0.0 | 8.5 | 15.8 | 21 | |
| 9 May 2025 | 0.0 | 6.8 | 17.8 | 19 | |
| 10 May 2025 | 0.0 | 8.9 | 21.1 | 23 | |
| 11 May 2025 | 0.3 | 13.0 | 22.5 | 21 | |
| 12 May 2025 | 0.8 | 12.0 | 19.2 | 27 | |
| 13 May 2025 | 0.6 | 12.8 | 21.0 | 26 | |
| 14 May 2025 | 0.0 | 11.9 | 21.0 | 19 | |
| 15 May 2025 | 0.0 | 9.7 | 19.7 | 17 | |
| 16 May 2025 | 0.0 | 8.8 | 21.3 | 21 | |
| 17 May 2025 | 0.0 | 9.7 | 18.0 | 26 | |
| 18 May 2025 | 0.0 | 7.1 | 19.5 | 23 | |
| 19 May 2025 | 0.5 | 10.2 | 17.9 | 21 | |
| 20 May 2025 | 0.1 | 9.1 | 19.3 | 19 | |
| 21 May 2025 | 1.6 | 11.4 | 18.4 | 28 | |
| 22 May 2025 | 0.0 | 9.7 | 19.5 | 26 | |
| 23 May 2025 | 0.5 | 9.2 | 19.0 | 23 | |
| 24 May 2025 | 10.1 | 14.1 | 17.5 | 37 | wet |
| 25 May 2025 | 2.1 | 12.1 | 15.5 | 41 | |
| 26 May 2025 | 7.4 | 10.9 | 14.5 | 42 | wet |
| 27 May 2025 | 15.7 | 12.6 | 15.1 | 43 | wet |
| 28 May 2025 | 2.9 | 12.2 | 17.2 | 34 | |
| 29 May 2025 | 7.6 | 13.2 | 16.2 | 38 | wet |
| 30 May 2025 | 2.9 | 13.8 | 17.1 | 29 | |
| 31 May 2025 | 2.4 | 12.9 | 17.6 | 30 |
4 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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