Weather delay tool
Weather record

Construction weather in Portsmouth, June 2025

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 Jun 2025 to 30 Jun 2025

PO1 2EG · 1 Jun 2025 – 30 Jun 2025

Rainfall over this period was 98% 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

98%

50 mm vs 51 mm typical

Rain days >5mm

3

typical: 3.0

Frost days

0

typical: 0.0

High-wind days

1

gusts ≥ 47 mph

Daily record

DateRain (mm)Min °CMax °CGust (mph)Flags
1 Jun 20250.013.117.737
2 Jun 20250.011.018.931
3 Jun 20251.612.216.849wind
4 Jun 20250.311.616.432
5 Jun 20259.012.615.936wet
6 Jun 20254.411.817.438
7 Jun 202510.111.515.541wet
8 Jun 20250.29.016.827
9 Jun 20250.411.717.028
10 Jun 20250.613.320.832
11 Jun 20250.012.820.828
12 Jun 20251.915.719.729
13 Jun 202511.716.022.218wet
14 Jun 20251.214.318.134
15 Jun 20251.212.520.625
16 Jun 20250.112.620.220
17 Jun 20250.012.022.222
18 Jun 20250.013.523.822
19 Jun 20250.014.624.719
20 Jun 20250.017.725.026
21 Jun 20250.318.425.427
22 Jun 20251.115.721.041
23 Jun 20250.215.821.736
24 Jun 20251.514.421.137
25 Jun 20250.015.221.423
26 Jun 20252.216.222.438
27 Jun 20251.715.821.137
28 Jun 20250.017.722.729
29 Jun 20250.017.724.223
30 Jun 20250.016.124.521

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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