Weather in Portsmouth in August
In an average August, Portsmouth sees a daily high around 21°C and a low around 13°C, based on 1980–2026 of local climate records.
| Average high | 21°C |
|---|---|
| Typical high range | 18°C to 25°C |
| Average low | 13°C |
| Typical low range | 10°C to 16°C |
| Average daily precipitation | 3 mm |
August records
The most extreme August on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total August accumulation.
High
Highest
33°C
1990-08-03
Lowest
14°C
1986-08-03
Low
Highest
20°C
2026-08-13
Lowest
6°C
2014-08-24
Feels-like
Highest
39°C
2020-08-12
Lowest
2°C
2014-08-21
Humidity
Highest
16.2 g/m³
2020-08-13
Lowest
6.9 g/m³
2012-08-31
Wind
Highest
47 km/h
2019-08-10
Lowest
7 km/h
2002-08-23
Gust
Highest
92 km/h
2019-08-10
Lowest
13 km/h
1992-08-18
Precip
Wettest
140 mm
1992
Driest
4 mm
1995
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