Portland Harbour Weather Forecast, Dorset

Today 13 Jul South West England

Temperatures a degree or two lower today, though still widely very warm with sunny spells and light winds. Fair weather cloud bubbling up through the afternoon with a few showers possible in the far west later. Maximum Temperature 29C.

Tonight 13 Jul South West England

Increasingly cloudy overnight with showers spreading northeastwards, these perhaps heavy and thundery at times. Still feeling rather warm and muggy in the east, but a fresher feel further west. Minimum Temperature 13C.

Mon 14 Jul South West England

A cloudier start to the new week, with heavy and perhaps thundery showers continuing to move northeastwards. Some drier and brighter interludes possible. Increasingly breezy and feeling fresher for all. Maximum Temperature 23C.

Tue 15 Jul South West England

Remaining rather changeable with spells of rain or showers, these sometimes turning heavy and thundery. Temperatures briefly dropping back closer to the seasonal average by mid-week.

Wed 16 Jul South West England

Remaining rather changeable with spells of rain or showers, these sometimes turning heavy and thundery. Temperatures briefly dropping back closer to the seasonal average by mid-week.

Thu 17 Jul South West England

Remaining rather changeable with spells of rain or showers, these sometimes turning heavy and thundery. Temperatures briefly dropping back closer to the seasonal average by mid-week.

Fri 18 Jul South West England

Weather conditions are expected to be changeable across the UK during this forecast period. Periods of fine and dry weather are expected at times. These settled spells could persist for several days at a time and are likely to be accompanied by plenty of sunshine. Interspersed with this will be cloudier, more unsettled intervals which will bring some showers or longer spells of persistent rainfall. Some of the rainfall is likely to be heavy in places, with a risk thunderstorms at times as well. Temperatures are expected to be above normal for the majority of the UK throughout this period. Some hot conditions are likely to develop at times, particularly in southern and eastern areas of the UK.

Sat 19 Jul South West England

Weather conditions are expected to be changeable across the UK during this forecast period. Periods of fine and dry weather are expected at times. These settled spells could persist for several days at a time and are likely to be accompanied by plenty of sunshine. Interspersed with this will be cloudier, more unsettled intervals which will bring some showers or longer spells of persistent rainfall. Some of the rainfall is likely to be heavy in places, with a risk thunderstorms at times as well. Temperatures are expected to be above normal for the majority of the UK throughout this period. Some hot conditions are likely to develop at times, particularly in southern and eastern areas of the UK.

Portland Harbour Weather Forecast

Today 13 Jul South West England

Tonight 13 Jul South West England

Mon 14 Jul South West England

Tue 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

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portland Harbour Temperature Statistics

July Temperature

Isle Of Portland (6km)

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 (6km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025