What is the weather like in Portsmouth right now?
It is currently 20°C in Portsmouth with light drizzle. It feels like 19°C, humidity is 79% and the wind is SW 22 km/h.
Today (Saturday) reaches a maximum of 20°C and a minimum of 17°C, with 7.8 mm of rain and 1.9 hours of sunshine. Sunrise is at 06:13 and sunset at 19:56.
Portsmouth weather tomorrow
Tomorrow (Sunday) the maximum temperature in Portsmouth is 21°C and the minimum 17°C. Around 3.3 mm of rain is expected with 5.6 hours of sunshine, and the chance of rain is 100%. The data is refreshed several times a day through Open-Meteo.
Portsmouth weather this week and next week
Over the coming week the average maximum temperature in Portsmouth sits around 21°C and the average minimum around 16°C. Roughly 13.2 mm of rain is expected, spread across 2 days, with 0 largely sunny days.
The warmest day in the 14 day forecast for Portsmouth is Friday 4 Sept at 22°C. The coldest night falls on Sunday 6 Sept at 12°C. Click any day for hourly detail.
Rain, sunshine and UV in Portsmouth
A daily rainfall total says little on its own: the same 5 mm can be one short downpour or a grey day of drizzle, which is why the hourly chart above is often the more useful of the two. Over the next fortnight the highest UV index for Portsmouth is 5, which is low to moderate.
How reliable is a 14 day forecast?
The first three to five days are generally very accurate. After that the certainty drops off and it is better read as a trend than as an exact daily prediction. Our data comes from Open-Meteo, which combines national weather models — among them the Met Office, DWD and ECMWF — and recomputes them several times a day using measurements from stations worldwide.
Forecast for Portsmouth last updated: 29 August 2026 at 14:25. See also all United Kingdom forecasts and the European weather map.