Daily rainfall, frost and wind for Belfast against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
BT1 5GS · 1 Sept 2025 – 30 Sept 2025
Rainfall over this period was 139% of the 10-year average for the same calendar window at this location. Conditions were materially wetter than typical for the time of year.
Rainfall vs 10-yr avg
139%
135 mm vs 97 mm typical
Rain days >5mm
10
typical: 6.6
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 Sept 2025 | 5.8 | 12.4 | 17.3 | 38 | wet |
| 2 Sept 2025 | 0.2 | 10.2 | 16.8 | 22 | |
| 3 Sept 2025 | 18.5 | 12.0 | 16.0 | 15 | wet |
| 4 Sept 2025 | 1.1 | 9.4 | 16.3 | 22 | |
| 5 Sept 2025 | 0.2 | 10.7 | 16.6 | 22 | |
| 6 Sept 2025 | 1.7 | 12.9 | 17.5 | 39 | |
| 7 Sept 2025 | 18.6 | 12.4 | 17.5 | 39 | wet |
| 8 Sept 2025 | 3.3 | 9.2 | 15.1 | 27 | |
| 9 Sept 2025 | 1.9 | 10.6 | 16.2 | 45 | |
| 10 Sept 2025 | 10.5 | 11.1 | 15.5 | 32 | wet |
| 11 Sept 2025 | 0.7 | 9.2 | 13.7 | 39 | |
| 12 Sept 2025 | 1.9 | 8.7 | 14.3 | 32 | |
| 13 Sept 2025 | 5.2 | 7.8 | 14.5 | 38 | wet |
| 14 Sept 2025 | 9.0 | 8.6 | 14.4 | 45 | wet |
| 15 Sept 2025 | 1.6 | 11.0 | 15.6 | 38 | |
| 16 Sept 2025 | 1.6 | 11.3 | 15.6 | 34 | |
| 17 Sept 2025 | 15.7 | 11.4 | 18.0 | 39 | wet |
| 18 Sept 2025 | 1.8 | 11.2 | 17.5 | 32 | |
| 19 Sept 2025 | 3.7 | 13.0 | 17.3 | 28 | |
| 20 Sept 2025 | 5.9 | 9.9 | 14.0 | 31 | wet |
| 21 Sept 2025 | 0.4 | 7.4 | 12.2 | 25 | |
| 22 Sept 2025 | 0.1 | 3.8 | 12.4 | 18 | |
| 23 Sept 2025 | 0.0 | 6.2 | 13.5 | 11 | |
| 24 Sept 2025 | 0.0 | 6.0 | 14.9 | 24 | |
| 25 Sept 2025 | 0.0 | 7.5 | 15.5 | 26 | |
| 26 Sept 2025 | 0.0 | 8.9 | 14.8 | 29 | |
| 27 Sept 2025 | 16.0 | 8.3 | 13.6 | 34 | wet |
| 28 Sept 2025 | 0.5 | 6.3 | 14.2 | 11 | |
| 29 Sept 2025 | 0.5 | 5.6 | 14.5 | 24 | |
| 30 Sept 2025 | 9.0 | 11.1 | 15.4 | 23 | wet |
10 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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