Daily rainfall, frost and wind for Portsmouth against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
PO1 2EG · 1 May 2025 – 31 May 2025
Rainfall over this period was 56% 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
56%
28 mm vs 51 mm typical
Rain days >5mm
1
typical: 3.0
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 | 12.5 | 21.5 | 19 | |
| 2 May 2025 | 0.0 | 12.3 | 21.0 | 21 | |
| 3 May 2025 | 0.4 | 11.2 | 20.3 | 32 | |
| 4 May 2025 | 0.0 | 7.1 | 14.4 | 32 | |
| 5 May 2025 | 1.0 | 5.0 | 13.0 | 35 | |
| 6 May 2025 | 0.0 | 5.6 | 14.6 | 24 | |
| 7 May 2025 | 0.0 | 6.4 | 16.6 | 23 | |
| 8 May 2025 | 0.0 | 7.9 | 16.3 | 23 | |
| 9 May 2025 | 0.0 | 6.7 | 17.0 | 24 | |
| 10 May 2025 | 0.0 | 9.5 | 19.3 | 30 | |
| 11 May 2025 | 0.0 | 12.1 | 18.5 | 29 | |
| 12 May 2025 | 0.0 | 12.9 | 16.5 | 23 | |
| 13 May 2025 | 0.0 | 12.7 | 19.3 | 20 | |
| 14 May 2025 | 0.0 | 10.4 | 22.0 | 19 | |
| 15 May 2025 | 0.0 | 8.0 | 17.0 | 26 | |
| 16 May 2025 | 0.0 | 8.3 | 19.5 | 23 | |
| 17 May 2025 | 0.0 | 9.4 | 16.9 | 21 | |
| 18 May 2025 | 0.0 | 9.4 | 16.8 | 21 | |
| 19 May 2025 | 0.3 | 9.0 | 18.4 | 23 | |
| 20 May 2025 | 0.0 | 9.4 | 20.2 | 16 | |
| 21 May 2025 | 4.4 | 11.9 | 15.6 | 17 | |
| 22 May 2025 | 0.7 | 7.9 | 14.5 | 21 | |
| 23 May 2025 | 0.5 | 8.1 | 14.8 | 25 | |
| 24 May 2025 | 1.9 | 13.4 | 17.3 | 34 | |
| 25 May 2025 | 2.2 | 13.2 | 18.0 | 37 | |
| 26 May 2025 | 2.2 | 11.3 | 16.1 | 44 | |
| 27 May 2025 | 8.8 | 13.6 | 15.9 | 46 | wet |
| 28 May 2025 | 4.0 | 13.7 | 20.0 | 37 | |
| 29 May 2025 | 1.1 | 13.7 | 18.4 | 37 | |
| 30 May 2025 | 0.7 | 14.1 | 19.3 | 26 | |
| 31 May 2025 | 0.0 | 12.4 | 21.1 | 30 |
1 day 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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