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 Jun 2026 – 30 Jun 2026
Rainfall over this period was 156% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year. 2 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
156%
79 mm vs 51 mm typical
Rain days >5mm
5
typical: 3.0
Frost days
0
typical: 0.0
High-wind days
2
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Jun 2026 | 5.1 | 13.1 | 17.8 | 29 | wet |
| 2 Jun 2026 | 22.9 | 14.4 | 17.3 | 34 | wet |
| 3 Jun 2026 | 4.6 | 12.8 | 17.0 | 53 | wind |
| 4 Jun 2026 | 6.9 | 13.1 | 16.3 | 42 | wet |
| 5 Jun 2026 | 0.4 | 11.1 | 15.6 | 30 | |
| 6 Jun 2026 | 12.0 | 12.7 | 15.0 | 48 | wet · wind |
| 7 Jun 2026 | 0.5 | 11.9 | 16.4 | 32 | |
| 8 Jun 2026 | 10.5 | 11.1 | 16.2 | 29 | wet |
| 9 Jun 2026 | 3.3 | 9.9 | 16.0 | 32 | |
| 10 Jun 2026 | 4.1 | 9.1 | 15.0 | 29 | |
| 11 Jun 2026 | 3.0 | 9.5 | 16.3 | 41 | |
| 12 Jun 2026 | 0.3 | 14.9 | 18.3 | 32 | |
| 13 Jun 2026 | 0.0 | 12.0 | 20.3 | 24 | |
| 14 Jun 2026 | 0.0 | 10.9 | 19.6 | 17 | |
| 15 Jun 2026 | 0.0 | 13.7 | 18.9 | 33 | |
| 16 Jun 2026 | 0.9 | 13.9 | 20.6 | 29 | |
| 17 Jun 2026 | 3.1 | 15.5 | 19.4 | 31 | |
| 18 Jun 2026 | 0.1 | 15.4 | 19.7 | 19 | |
| 19 Jun 2026 | 0.0 | 14.4 | 22.5 | 29 | |
| 20 Jun 2026 | 0.0 | 16.1 | 21.6 | 21 | |
| 21 Jun 2026 | 0.0 | 15.2 | 26.1 | 15 | |
| 22 Jun 2026 | 0.0 | 17.9 | 28.7 | 27 | |
| 23 Jun 2026 | 0.1 | 19.9 | 27.9 | 28 | |
| 24 Jun 2026 | 0.0 | 21.9 | 34.1 | 15 | |
| 25 Jun 2026 | 0.0 | 21.9 | 33.2 | 29 | |
| 26 Jun 2026 | 0.0 | 19.7 | 27.9 | 29 | |
| 27 Jun 2026 | 0.8 | 18.1 | 25.3 | 20 | |
| 28 Jun 2026 | 0.2 | 17.2 | 21.2 | 34 | |
| 29 Jun 2026 | 0.0 | 13.1 | 21.2 | 27 | |
| 30 Jun 2026 | 0.5 | 15.5 | 20.2 | 28 |
5 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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