Portland Harbour Weather Forecast, Dorset

Today 9 Dec South West England

Storm Bram brings a mainly cloudy start with outbreaks of heavy rain through the morning, especially over Dartmoor. Rain eventually eases bringing brighter skies through the afternoon. Gales easing but staying windy around the coasts. Exceptionally mild for December. Maximum Temperature 15C.

Tonight 9 Dec South West England

Skies continue to clear and any rain will ease, leaving a dry night at first. Showers move into the west later which will be heavy at times. Winds remain blustery. Minimum Temperature 10C.

Wed 10 Dec South West England

A much brighter day with sunny spells across the region. Some isolated showers for the west, but easing as they track eastwards. Winds easing through the day. Cooler than Tuesday. Maximum Temperature 12C.

Thu 11 Dec South West England

Turning cloudier again on Thursday but staying mostly dry. Showers moving in overnight with sunshine and showers to end the week. Wet and windy again for Saturday. Staying mild.

Fri 12 Dec South West England

Turning cloudier again on Thursday but staying mostly dry. Showers moving in overnight with sunshine and showers to end the week. Wet and windy again for Saturday. Staying mild.

Sat 13 Dec South West England

Turning cloudier again on Thursday but staying mostly dry. Showers moving in overnight with sunshine and showers to end the week. Wet and windy again for Saturday. Staying mild.

Sun 14 Dec South West England

A continuation of a similar pattern to that seen through early December is anticipated, especially at first, as frontal systems from the Atlantic spread into and across the UK, interspersed with some temporary drier interludes. These will bring spells of rain, which may be heavy at times leading to the risk of some impacts given how wet it has been lately, especially in the west. In addition, there may also be potential for some periods of strong winds at times too. Whilst it will often be mild, later in the period there may be a slight downward trend in temperature, especially across northern parts of the UK where there may also be a slightly higher chance of some wintry hazards at times.

Mon 15 Dec South West England

A continuation of a similar pattern to that seen through early December is anticipated, especially at first, as frontal systems from the Atlantic spread into and across the UK, interspersed with some temporary drier interludes. These will bring spells of rain, which may be heavy at times leading to the risk of some impacts given how wet it has been lately, especially in the west. In addition, there may also be potential for some periods of strong winds at times too. Whilst it will often be mild, later in the period there may be a slight downward trend in temperature, especially across northern parts of the UK where there may also be a slightly higher chance of some wintry hazards at times.

Portland Harbour Weather Forecast

Today 9 Dec South West England

Tonight 9 Dec South West England

Wed 10 Dec South West England

Thu 11 Dec South West England

Fri 12 Dec South West England

Sat 13 Dec South West England

Sun 14 Dec South West England

Mon 15 Dec South West England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portland Harbour Temperature Statistics

December Temperature

Isle Of Portland (6km)

Lowest 8 January, 2025

Average 2025

Highest 15 August, 2025

Lowest 21 November, 2025

Average November

Highest 13 November, 2025

Lowest 4 December, 2025

Average December

Highest 7 December, 2025

Climate (2020–Present)

Isle Of Portland (6km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025