Weather delay tool
Weather record

Construction weather in Northampton, September 2025

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

Weather delay record

Northampton — 1 Sept 2025 to 30 Sept 2025

NN1 1DE · 1 Sept 2025 – 30 Sept 2025

Rainfall over this period was 88% 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

88%

57 mm vs 65 mm typical

Rain days >5mm

3

typical: 3.7

Frost days

0

typical: 0.0

High-wind days

1

gusts ≥ 47 mph

Daily record

DateRain (mm)Min °CMax °CGust (mph)Flags
1 Sept 20250.513.220.137
2 Sept 20250.911.219.425
3 Sept 202515.314.619.438wet
4 Sept 20253.312.017.632
5 Sept 20250.010.819.821
6 Sept 20250.011.621.932
7 Sept 20250.715.023.430
8 Sept 20250.412.219.223
9 Sept 20250.79.319.521
10 Sept 20258.113.017.931wet
11 Sept 20250.410.516.438
12 Sept 20250.69.816.835
13 Sept 20252.310.416.530
14 Sept 202511.58.116.233wet
15 Sept 20250.512.817.252wind
16 Sept 20250.011.317.436
17 Sept 20254.011.718.739
18 Sept 20250.716.122.137
19 Sept 20250.015.823.826
20 Sept 20253.011.920.244
21 Sept 20250.18.314.447
22 Sept 20250.05.814.222
23 Sept 20250.06.315.621
24 Sept 20250.28.616.724
25 Sept 20250.08.517.327
26 Sept 20250.17.915.522
27 Sept 20250.07.916.327
28 Sept 20253.410.516.915
29 Sept 20250.06.416.513
30 Sept 20250.07.017.914

3 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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