Daily rainfall, frost and wind for Swindon against the 10-year average — the starting point for any weather delay conversation on site.
Weather delay record
SN1 1LD · 1 Sept 2025 – 30 Sept 2025
Rainfall over this period was 117% 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
117%
67 mm vs 57 mm typical
Rain days >5mm
4
typical: 3.7
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 Sept 2025 | 1.9 | 13.2 | 18.9 | 33 | |
| 2 Sept 2025 | 0.8 | 11.5 | 18.9 | 25 | |
| 3 Sept 2025 | 19.9 | 14.5 | 18.5 | 38 | wet |
| 4 Sept 2025 | 5.3 | 12.5 | 17.8 | 33 | wet |
| 5 Sept 2025 | 0.0 | 10.9 | 19.7 | 21 | |
| 6 Sept 2025 | 0.0 | 12.4 | 21.4 | 32 | |
| 7 Sept 2025 | 3.9 | 14.5 | 21.9 | 40 | |
| 8 Sept 2025 | 0.5 | 11.0 | 18.5 | 27 | |
| 9 Sept 2025 | 1.1 | 10.6 | 18.1 | 28 | |
| 10 Sept 2025 | 5.5 | 12.9 | 17.2 | 33 | wet |
| 11 Sept 2025 | 2.9 | 10.8 | 15.2 | 42 | |
| 12 Sept 2025 | 1.7 | 9.8 | 15.7 | 35 | |
| 13 Sept 2025 | 0.9 | 10.5 | 16.1 | 33 | |
| 14 Sept 2025 | 11.5 | 8.6 | 16.8 | 44 | wet |
| 15 Sept 2025 | 2.6 | 12.4 | 15.9 | 52 | wind |
| 16 Sept 2025 | 0.1 | 11.0 | 16.9 | 34 | |
| 17 Sept 2025 | 3.8 | 11.7 | 17.8 | 37 | |
| 18 Sept 2025 | 0.7 | 16.3 | 20.9 | 35 | |
| 19 Sept 2025 | 0.0 | 14.1 | 23.2 | 24 | |
| 20 Sept 2025 | 1.9 | 11.2 | 18.6 | 44 | |
| 21 Sept 2025 | 0.0 | 7.9 | 14.0 | 34 | |
| 22 Sept 2025 | 0.0 | 5.1 | 14.4 | 24 | |
| 23 Sept 2025 | 0.0 | 4.1 | 15.6 | 22 | |
| 24 Sept 2025 | 0.0 | 7.4 | 16.0 | 27 | |
| 25 Sept 2025 | 0.0 | 6.8 | 17.3 | 26 | |
| 26 Sept 2025 | 0.1 | 5.9 | 15.3 | 20 | |
| 27 Sept 2025 | 0.2 | 8.7 | 15.3 | 29 | |
| 28 Sept 2025 | 1.4 | 9.4 | 16.8 | 22 | |
| 29 Sept 2025 | 0.0 | 5.1 | 16.7 | 12 | |
| 30 Sept 2025 | 0.0 | 7.0 | 17.6 | 14 |
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.
Need this for your exact site and dates?
Run the free tool with your postcode and claim period — print-ready evidence in seconds.
Check your site's dates