Portland Harbour Weather Forecast, Dorset

Today 6 Jan South West England

An icy start to the day, with sunny spells and a few wintry showers in the west. Cloud increasing through the afternoon with rain and stronger winds arriving across Cornwall by the evening. Another cold day for many. Maximum Temperature 8C.

Tonight 6 Jan South West England

A band of rain will move eastwards this evening, perhaps falling as snow over the Moors. This clearing during the early hours. Icy stretches developing where skies clear. Minimum Temperature -2C.

Wed 7 Jan South West England

Another cold day for many, with rather cloudy skies. A scattering of wintry showers still possible. Rain then returning across Cornwall and west Devon by the evening. Gusty winds. Maximum Temperature 9C.

Thu 8 Jan South West England

Most likely a dry start on Thursday. Then an increasing risk of heavy rain, along with strong winds, which may linger into Friday. Sunshine and showers following on Saturday.

Fri 9 Jan South West England

Most likely a dry start on Thursday. Then an increasing risk of heavy rain, along with strong winds, which may linger into Friday. Sunshine and showers following on Saturday.

Sat 10 Jan South West England

Most likely a dry start on Thursday. Then an increasing risk of heavy rain, along with strong winds, which may linger into Friday. Sunshine and showers following on Saturday.

Sun 11 Jan South West England

A changeable period is expected, with Atlantic frontal systems occasionally affecting the UK, bringing spells of rain, probably preceded by snow in some areas, this more likely in northern and eastern parts. Some significant snowfall is possible in places, particularly on northern hills. These low pressure systems could also bring some strong winds. These will be interspersed with quieter, drier interludes under transient ridges of high pressure, with the potential for frost, and wintry showers along coasts exposed to northerly winds. After a cold start, temperatures will tend to trend closer to average, especially in the south, such that the frequency of wintry hazards may reduce slightly. However, there is a hint late in this period that it may briefly turn more widely drier and colder again.

Mon 12 Jan South West England

A changeable period is expected, with Atlantic frontal systems occasionally affecting the UK, bringing spells of rain, probably preceded by snow in some areas, this more likely in northern and eastern parts. Some significant snowfall is possible in places, particularly on northern hills. These low pressure systems could also bring some strong winds. These will be interspersed with quieter, drier interludes under transient ridges of high pressure, with the potential for frost, and wintry showers along coasts exposed to northerly winds. After a cold start, temperatures will tend to trend closer to average, especially in the south, such that the frequency of wintry hazards may reduce slightly. However, there is a hint late in this period that it may briefly turn more widely drier and colder again.

Portland Harbour Weather Forecast

Today 6 Jan South West England

Tonight 6 Jan South West England

Wed 7 Jan South West England

Thu 8 Jan South West England

Fri 9 Jan South West England

Sat 10 Jan South West England

Sun 11 Jan South West England

Mon 12 Jan South West England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portland Harbour Temperature Statistics

January Temperature

Isle Of Portland (6km)

Lowest 5 January, 2026

Average 2026

Highest 1 January, 2026

Lowest 26 December, 2025

Average December

Highest 9 December, 2025

Lowest 5 January, 2026

Average January

Highest 1 January, 2026

Climate (2021–Present)

Isle Of Portland (6km)

Average Low 2021–2026

Average 2021–2026

Average High 2021–2026