Portland Weather Forecast, Dorset

Today 15 Jul South West England

A largely dry and bright start but showers will become increasing frequent throughout the day. The showers will turn heavy and persistent at times, especially across the north. A windy day, especially over the hills and exposed coasts. Maximum Temperature 20C.

Tonight 15 Jul South West England

Any lingering showers will fade through this evening, allowing some clearer spells to develop for all but the far southwest overnight. Remaining widely cloudy here, with rain, drizzle, and hill fog spreading eastwards by dawn. Winds easing. Minimum Temperature 15C.

Wed 16 Jul South West England

Grey and rather gloomy for Cornwall and west Devon with rain and drizzle persisting through much of the day. Drier and brighter further east, with warm sunshine into the afternoon. Maximum Temperature 24C.

Thu 17 Jul South West England

A mixture of warm sunshine and a few scattered showers on Thursday and Friday. Cooler and more unsettled from Saturday with heavy downpours carrying a risk of thunder and hail.

Fri 18 Jul South West England

A mixture of warm sunshine and a few scattered showers on Thursday and Friday. Cooler and more unsettled from Saturday with heavy downpours carrying a risk of thunder and hail.

Sat 19 Jul South West England

A mixture of warm sunshine and a few scattered showers on Thursday and Friday. Cooler and more unsettled from Saturday with heavy downpours carrying a risk of thunder and hail.

Sun 20 Jul South West England

Overall a rather more changeable pattern of weather through this period, compared to much of the summer thus far. The first couple of days could well be particularly unsettled with heavy rain and/or thunderstorms in many areas. Into the following week, a general westerly type set-up looks to become established, with occasional weather systems moving in from the Atlantic. This means further rain or showers and breezy conditions at times, interspersed with some drier, sunnier periods. Temperatures are expected to average out above normal and whilst brief hotter and humid days are possible, the chance of prolonged heat is lower than during the last few weeks. This broad pattern is likely to continue towards the end of July.

Mon 21 Jul South West England

Overall a rather more changeable pattern of weather through this period, compared to much of the summer thus far. The first couple of days could well be particularly unsettled with heavy rain and/or thunderstorms in many areas. Into the following week, a general westerly type set-up looks to become established, with occasional weather systems moving in from the Atlantic. This means further rain or showers and breezy conditions at times, interspersed with some drier, sunnier periods. Temperatures are expected to average out above normal and whilst brief hotter and humid days are possible, the chance of prolonged heat is lower than during the last few weeks. This broad pattern is likely to continue towards the end of July.

Portland Weather Forecast

Today 15 Jul South West England

Tonight 15 Jul South West England

Wed 16 Jul South West England

Thu 17 Jul South West England

Fri 18 Jul South West England

Sat 19 Jul South West England

Sun 20 Jul South West England

Mon 21 Jul South West England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portland Temperature Statistics

July Temperature

Isle Of Portland (5km)

Lowest 8 January, 2025

Average 2025

Highest 10 July, 2025

Lowest 8 June, 2025

Average June

Highest 21 June, 2025

Lowest 3 July, 2025

Average July

Highest 10 July, 2025

Climate (2020–Present)

Isle Of Portland (5km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025