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 Oct 2025 – 31 Oct 2025
Rainfall over this period was 98% of the 10-year average for the same calendar window at this location. Conditions were broadly in line with typical for the time of year. 1 day had gusts at or above 47 mph.
Rainfall vs 10-yr avg
98%
103 mm vs 105 mm typical
Rain days >5mm
8
typical: 7.3
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 Oct 2025 | 0.0 | 9.9 | 17.5 | 17 | |
| 2 Oct 2025 | 0.0 | 11.8 | 17.4 | 28 | |
| 3 Oct 2025 | 14.8 | 14.9 | 17.2 | 45 | wet |
| 4 Oct 2025 | 5.5 | 11.6 | 17.0 | 53 | wet · wind |
| 5 Oct 2025 | 0.0 | 10.7 | 15.8 | 33 | |
| 6 Oct 2025 | 0.0 | 10.2 | 18.0 | 23 | |
| 7 Oct 2025 | 0.0 | 11.9 | 16.9 | 20 | |
| 8 Oct 2025 | 0.3 | 9.4 | 17.2 | 12 | |
| 9 Oct 2025 | 0.0 | 9.9 | 16.2 | 16 | |
| 10 Oct 2025 | 0.5 | 12.8 | 15.5 | 12 | |
| 11 Oct 2025 | 0.0 | 10.6 | 15.5 | 13 | |
| 12 Oct 2025 | 0.0 | 9.9 | 15.6 | 18 | |
| 13 Oct 2025 | 0.0 | 12.9 | 15.9 | 23 | |
| 14 Oct 2025 | 0.1 | 12.0 | 14.6 | 20 | |
| 15 Oct 2025 | 0.0 | 10.7 | 13.9 | 21 | |
| 16 Oct 2025 | 0.0 | 10.3 | 15.8 | 18 | |
| 17 Oct 2025 | 0.2 | 11.2 | 15.5 | 17 | |
| 18 Oct 2025 | 0.4 | 11.1 | 14.8 | 36 | |
| 19 Oct 2025 | 11.1 | 13.7 | 15.5 | 34 | wet |
| 20 Oct 2025 | 16.2 | 12.8 | 14.1 | 38 | wet |
| 21 Oct 2025 | 0.2 | 10.9 | 15.4 | 30 | |
| 22 Oct 2025 | 13.4 | 8.5 | 14.5 | 28 | wet |
| 23 Oct 2025 | 20.7 | 7.0 | 12.5 | 46 | wet |
| 24 Oct 2025 | 0.6 | 6.6 | 12.3 | 35 | |
| 25 Oct 2025 | 0.9 | 6.7 | 11.8 | 30 | |
| 26 Oct 2025 | 1.3 | 4.9 | 12.0 | 33 | |
| 27 Oct 2025 | 0.0 | 10.9 | 13.4 | 39 | |
| 28 Oct 2025 | 0.0 | 12.2 | 14.8 | 33 | |
| 29 Oct 2025 | 5.3 | 8.1 | 13.2 | 25 | wet |
| 30 Oct 2025 | 0.0 | 6.5 | 14.0 | 43 | |
| 31 Oct 2025 | 11.3 | 13.7 | 16.0 | 46 | wet |
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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