See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
21°
Clear
Feels Like: 22°
Min: 12°
Max: 22°
The next few hours will be clear, with today reaching 22°C and dropping to 17°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
06:32
Sunrise
18:45
Sunset
Moon
Waxing Crescent
12:28
Moonrise
20:46
Moonset
Daily Forecast
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Thursday
Friday
Saturday
Sunday
Monday
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Friday
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Weather in Portsmouth today, September 16, 2026
Plan for bright conditions in Portsmouth on September 16, 2026, though cloud cover thickens for a spell near 17:00. The day as a whole still leans toward sunshine.
The day peaks near 22°C and cools toward 12°C. Moisture in the air spans 72%-96%, with the highest values around 23:00. Expect gentle winds, highest near 16:00 at 5.7 km/h.
Afternoon conditions open up, holding cloud close to 38% near 17:00. The day finishes on a milder, brighter note. Visibility stays generally good near 15.1 km on average, though it can drop toward 13.3 km in thicker cloud or showers. Sunrise is at 06:32 and sunset at 18:45, giving 12 hours 12 minutes of sunlight today.
Overall, Portsmouth on September 16, 2026 favours outdoor plans under mostly open skies, with a comfortable high near 22°C.
Frequently asked questions about weather in Portsmouth
How warm does it get in Portsmouth?
The warmest month in Portsmouth is July, with average high temperatures of 24°C. The average temperature during this period is around 22°C.
How cold does it get in Portsmouth?
The coldest month in Portsmouth is January, with average low temperatures of -1°C. The average temperature during this period is around 2°C.
What is the wettest time of year in Portsmouth?
The wettest month in Portsmouth is December, with an average of 140mm of precipitation.
What is the driest time of year in Portsmouth?
The driest month in Portsmouth is June, with an average of 81mm of precipitation.
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