Weather delay tool
Weather record

Construction weather in Portsmouth, September 2024

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

Weather delay record

Portsmouth — 1 Sept 2024 to 30 Sept 2024

PO1 2EG · 1 Sept 2024 – 30 Sept 2024

Rainfall over this period was 176% 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

176%

147 mm vs 83 mm typical

Rain days >5mm

8

typical: 5.1

Frost days

0

typical: 0.0

High-wind days

0

gusts ≥ 47 mph

Daily record

DateRain (mm)Min °CMax °CGust (mph)Flags
1 Sept 20240.016.426.821
2 Sept 20242.417.320.023
3 Sept 20241.815.420.520
4 Sept 20240.112.718.912
5 Sept 202428.413.919.241wet
6 Sept 202417.213.317.316wet
7 Sept 20243.912.819.918
8 Sept 20242.314.918.721
9 Sept 20240.212.417.027
10 Sept 20244.411.318.337
11 Sept 20240.39.315.030
12 Sept 20241.07.614.424
13 Sept 20240.06.716.118
14 Sept 20240.07.616.117
15 Sept 20241.19.318.222
16 Sept 20240.013.419.317
17 Sept 20240.010.420.227
18 Sept 20240.013.322.430
19 Sept 20240.015.323.831
20 Sept 20243.713.820.131
21 Sept 20241.114.621.221
22 Sept 202411.415.718.427wet
23 Sept 202417.715.216.925wet
24 Sept 20241.112.116.821
25 Sept 20246.111.716.334wet
26 Sept 202418.012.316.443wet
27 Sept 20243.18.413.233
28 Sept 20240.06.013.817
29 Sept 20245.59.614.545wet
30 Sept 202416.511.716.047wet

8 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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