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 Jun 2025 – 30 Jun 2025
Rainfall over this period was 172% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 1 day had gusts at or above 47 mph.
Rainfall vs 10-yr avg
172%
167 mm vs 97 mm typical
Rain days >5mm
8
typical: 6.2
Frost days
0
typical: 0.0
High-wind days
1
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jun 2025 | 2.0 | 11.3 | 15.7 | 37 | |
| 2 Jun 2025 | 0.0 | 9.0 | 15.5 | 33 | |
| 3 Jun 2025 | 14.1 | 11.3 | 15.4 | 47 | wet · wind |
| 4 Jun 2025 | 3.2 | 9.8 | 15.1 | 29 | |
| 5 Jun 2025 | 13.8 | 11.5 | 15.6 | 30 | wet |
| 6 Jun 2025 | 3.5 | 10.8 | 14.5 | 30 | |
| 7 Jun 2025 | 9.5 | 10.1 | 14.9 | 27 | wet |
| 8 Jun 2025 | 0.5 | 8.3 | 14.1 | 29 | |
| 9 Jun 2025 | 3.1 | 10.9 | 15.7 | 28 | |
| 10 Jun 2025 | 2.6 | 12.7 | 18.2 | 31 | |
| 11 Jun 2025 | 0.0 | 10.0 | 22.0 | 29 | |
| 12 Jun 2025 | 54.5 | 14.1 | 17.2 | 28 | wet |
| 13 Jun 2025 | 11.0 | 14.7 | 18.5 | 29 | wet |
| 14 Jun 2025 | 8.3 | 13.4 | 17.7 | 30 | wet |
| 15 Jun 2025 | 2.8 | 12.5 | 17.0 | 28 | |
| 16 Jun 2025 | 0.1 | 13.1 | 18.2 | 19 | |
| 17 Jun 2025 | 1.4 | 12.8 | 18.2 | 23 | |
| 18 Jun 2025 | 0.0 | 13.2 | 21.3 | 13 | |
| 19 Jun 2025 | 0.0 | 10.9 | 26.8 | 22 | |
| 20 Jun 2025 | 0.0 | 18.1 | 27.7 | 27 | |
| 21 Jun 2025 | 11.6 | 15.6 | 24.5 | 26 | wet |
| 22 Jun 2025 | 4.4 | 15.5 | 18.7 | 36 | |
| 23 Jun 2025 | 1.0 | 12.2 | 16.9 | 34 | |
| 24 Jun 2025 | 4.3 | 15.0 | 18.2 | 32 | |
| 25 Jun 2025 | 3.1 | 16.1 | 20.3 | 24 | |
| 26 Jun 2025 | 3.3 | 14.7 | 17.6 | 34 | |
| 27 Jun 2025 | 5.6 | 14.1 | 19.7 | 37 | wet |
| 28 Jun 2025 | 2.9 | 17.1 | 19.4 | 29 | |
| 29 Jun 2025 | 0.8 | 16.7 | 21.6 | 16 | |
| 30 Jun 2025 | 0.0 | 13.6 | 24.4 | 18 |
8 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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