Weather delay tool
Weather record

Construction weather in Brighton, September 2025

Daily rainfall, frost and wind for Brighton against the 10-year average — the starting point for any weather delay conversation on site.

Weather delay record

Brighton — 1 Sept 2025 to 30 Sept 2025

BN1 1UG · 1 Sept 2025 – 30 Sept 2025

Rainfall over this period was 113% 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. 4 days had gusts at or above 47 mph.

Rainfall vs 10-yr avg

113%

87 mm vs 77 mm typical

Rain days >5mm

5

typical: 4.9

Frost days

0

typical: 0.0

High-wind days

4

gusts ≥ 47 mph

Daily record

DateRain (mm)Min °CMax °CGust (mph)Flags
1 Sept 20254.014.418.238
2 Sept 20259.013.818.436wet
3 Sept 202521.316.519.455wet · wind
4 Sept 20255.414.918.647wet
5 Sept 20250.511.818.922
6 Sept 20250.014.720.832
7 Sept 20250.016.522.130
8 Sept 20250.814.818.428
9 Sept 20250.111.918.421
10 Sept 202516.014.517.135wet
11 Sept 20253.213.316.847
12 Sept 20252.912.616.944
13 Sept 202510.012.016.338wet
14 Sept 20254.49.818.153wind
15 Sept 20251.014.517.257wind
16 Sept 20250.313.017.337
17 Sept 20252.013.717.847wind
18 Sept 20252.316.918.437
19 Sept 20250.815.721.220
20 Sept 20251.214.419.547
21 Sept 20250.28.915.238
22 Sept 20250.18.115.429
23 Sept 20250.06.815.426
24 Sept 20250.110.016.230
25 Sept 20250.09.516.832
26 Sept 20250.58.914.323
27 Sept 20250.610.915.625
28 Sept 20250.013.016.219
29 Sept 20250.08.617.913
30 Sept 20250.08.017.514

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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