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 Aug 2025 – 31 Aug 2025
Rainfall over this period was 69% of the 10-year average for the same calendar window at this location. Conditions were drier than typical for the time of year. 2 days had gusts at or above 47 mph.
Rainfall vs 10-yr avg
69%
71 mm vs 102 mm typical
Rain days >5mm
4
typical: 6.4
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 Aug 2025 | 1.0 | 11.3 | 17.4 | 25 | |
| 2 Aug 2025 | 1.9 | 9.5 | 21.2 | 23 | |
| 3 Aug 2025 | 3.4 | 14.4 | 19.2 | 27 | |
| 4 Aug 2025 | 2.8 | 13.1 | 17.6 | 52 | wind |
| 5 Aug 2025 | 0.8 | 11.7 | 17.3 | 40 | |
| 6 Aug 2025 | 0.2 | 11.5 | 18.6 | 27 | |
| 7 Aug 2025 | 3.4 | 13.3 | 18.2 | 33 | |
| 8 Aug 2025 | 0.2 | 11.6 | 19.2 | 38 | |
| 9 Aug 2025 | 0.9 | 13.0 | 18.6 | 35 | |
| 10 Aug 2025 | 1.0 | 10.0 | 18.3 | 24 | |
| 11 Aug 2025 | 2.7 | 14.7 | 21.0 | 20 | |
| 12 Aug 2025 | 0.0 | 13.6 | 24.3 | 15 | |
| 13 Aug 2025 | 0.0 | 14.8 | 22.7 | 23 | |
| 14 Aug 2025 | 16.1 | 14.8 | 21.8 | 20 | wet |
| 15 Aug 2025 | 0.4 | 11.7 | 21.3 | 20 | |
| 16 Aug 2025 | 0.0 | 13.5 | 21.1 | 23 | |
| 17 Aug 2025 | 0.0 | 12.4 | 21.6 | 21 | |
| 18 Aug 2025 | 0.0 | 14.9 | 21.3 | 25 | |
| 19 Aug 2025 | 0.0 | 13.9 | 18.2 | 25 | |
| 20 Aug 2025 | 0.0 | 11.6 | 16.9 | 22 | |
| 21 Aug 2025 | 0.1 | 7.5 | 19.6 | 13 | |
| 22 Aug 2025 | 0.8 | 11.4 | 19.9 | 17 | |
| 23 Aug 2025 | 0.7 | 13.4 | 20.8 | 21 | |
| 24 Aug 2025 | 0.3 | 14.8 | 20.6 | 25 | |
| 25 Aug 2025 | 3.4 | 14.0 | 20.9 | 36 | |
| 26 Aug 2025 | 2.2 | 13.8 | 18.9 | 30 | |
| 27 Aug 2025 | 9.3 | 12.3 | 18.3 | 30 | wet |
| 28 Aug 2025 | 4.1 | 12.7 | 16.0 | 31 | |
| 29 Aug 2025 | 1.5 | 11.2 | 17.6 | 30 | |
| 30 Aug 2025 | 7.2 | 11.4 | 18.1 | 45 | wet |
| 31 Aug 2025 | 6.1 | 12.2 | 17.0 | 48 | wet · wind |
4 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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