Weather in Portsmouth in September
In an average September, Portsmouth sees a daily high around 18°C and a low around 14°C, based on 1980–2026 of local climate records.
| Average high | 18°C |
|---|---|
| Typical high range | 16°C to 20°C |
| Average low | 14°C |
| Typical low range | 11°C to 16°C |
| Average daily precipitation | 3 mm |
September records
The most extreme September on record for each metric, across 1980–2026. For rainfall, the wettest and driest are by total September accumulation.
High
Highest
25°C
2023-09-09
Lowest
11°C
1993-09-27
Low
Highest
19°C
2023-09-07
Lowest
8°C
2010-09-25
Feels-like
Highest
25°C
2023-09-09
Lowest
3°C
2010-09-25
Humidity
Highest
15.5 g/m³
2023-09-07
Lowest
6.2 g/m³
2007-09-18
Wind
Highest
61 km/h
1981-09-19
Lowest
7 km/h
2023-09-08
Gust
Highest
102 km/h
1981-09-19
Lowest
11 km/h
2023-09-08
Precip
Wettest
165 mm
2024
Driest
11 mm
2014
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