See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
28°
Mostly Cloudy
Feels Like: 30°
Min: 27°
Max: 30°
The next few hours will be mostly clear, with tomorrow reaching 30°C and dropping to 27°C. The coming days will be drizzle
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:58
Sunrise
17:55
Sunset
Moon
Waxing Gibbous
16:41
Moonrise
03:58
Moonset
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View stargazing scoreWeather in Portsmouth tomorrow, September 25, 2026
Rain features in Portsmouth on September 25, 2026, so keep waterproofs handy through the day. The damp theme is strongest where shower chances rise. Cloud leads the morning, peaking close to 89% near 02:00. Sunshine has little room until later in the day.
The temperature range runs from about 28°C up to 30°C. Expect humidity between 67% and 84%, most humid near 22:00. Winds stay light, near 4.1 km/h by 17:00, so the day feels still more than breezy.
Expect persistent cloud later on, with amounts around 93% by 20:00. Sunshine remains the exception, not the rule. Horizontal visibility holds close to 16.1 km. The sun rises at 05:58 and sets at 17:54, for a total of 11 hours 55 minutes of sunlight today.
The practical takeaway for Portsmouth on September 25, 2026 is simple: plan for rain, keep layers handy, and work around a high of about 30°C.
Frequently asked questions about weather in Portsmouth
How warm does it get in Portsmouth?
The warmest month in Portsmouth is September, with average high temperatures of 28°C. The average temperature during this period is around 28°C.
How cold does it get in Portsmouth?
The coldest month in Portsmouth is February, with average low temperatures of 24°C. The average temperature during this period is around 25°C.
What is the wettest time of year in Portsmouth?
The wettest month in Portsmouth is September, with an average of 131mm of precipitation.
What is the driest time of year in Portsmouth?
The driest month in Portsmouth is March, with an average of 33mm of precipitation.
