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 Mar 2026 – 31 Mar 2026
Rainfall over this period was 52% of the 10-year average for the same calendar window at this location. Conditions were drier than typical for the time of year. 4 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
52%
39 mm vs 75 mm typical
Rain days >5mm
2
typical: 5.2
Frost days
0
typical: 2.2
High-wind days
4
gusts ≥ 47 mph
Daily record
| Date | Rain (mm) | Min °C | Max °C | Gust (mph) | Flags |
|---|---|---|---|---|---|
| 1 Mar 2026 | 3.9 | 7.7 | 11.6 | 41 | |
| 2 Mar 2026 | 0.0 | 8.1 | 12.3 | 30 | |
| 3 Mar 2026 | 0.0 | 6.2 | 15.0 | 16 | |
| 4 Mar 2026 | 0.0 | 6.2 | 12.8 | 21 | |
| 5 Mar 2026 | 0.9 | 8.2 | 13.1 | 22 | |
| 6 Mar 2026 | 5.3 | 7.8 | 10.6 | 19 | wet |
| 7 Mar 2026 | 0.3 | 7.8 | 11.5 | 16 | |
| 8 Mar 2026 | 0.0 | 7.2 | 9.3 | 20 | |
| 9 Mar 2026 | 4.2 | 7.2 | 10.8 | 18 | |
| 10 Mar 2026 | 0.7 | 8.2 | 10.9 | 32 | |
| 11 Mar 2026 | 4.5 | 7.8 | 12.1 | 37 | |
| 12 Mar 2026 | 2.2 | 7.7 | 11.5 | 52 | wind |
| 13 Mar 2026 | 9.5 | 3.8 | 11.4 | 54 | wet · wind |
| 14 Mar 2026 | 0.6 | 2.0 | 10.8 | 16 | |
| 15 Mar 2026 | 2.2 | 2.1 | 11.0 | 42 | |
| 16 Mar 2026 | 0.1 | 6.5 | 11.5 | 31 | |
| 17 Mar 2026 | 0.3 | 8.9 | 11.4 | 28 | |
| 18 Mar 2026 | 0.0 | 9.0 | 14.6 | 30 | |
| 19 Mar 2026 | 0.0 | 6.3 | 16.0 | 21 | |
| 20 Mar 2026 | 0.0 | 4.8 | 14.9 | 16 | |
| 21 Mar 2026 | 0.0 | 4.1 | 12.8 | 16 | |
| 22 Mar 2026 | 0.0 | 2.8 | 11.6 | 14 | |
| 23 Mar 2026 | 0.0 | 4.7 | 12.1 | 17 | |
| 24 Mar 2026 | 1.4 | 8.9 | 11.3 | 52 | wind |
| 25 Mar 2026 | 0.6 | 4.8 | 9.2 | 47 | wind |
| 26 Mar 2026 | 0.0 | 3.0 | 10.1 | 27 | |
| 27 Mar 2026 | 0.9 | 6.7 | 11.4 | 29 | |
| 28 Mar 2026 | 0.0 | 3.9 | 10.1 | 37 | |
| 29 Mar 2026 | 0.9 | 2.5 | 10.2 | 38 | |
| 30 Mar 2026 | 0.0 | 6.0 | 12.4 | 37 | |
| 31 Mar 2026 | 0.5 | 7.3 | 17.4 | 21 |
2 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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