Portland Harbour Weather Forecast, Dorset

Today 16 Jun South West England

Any low cloud, patchy mist and fog lifting and clearing fairly readily in the morning to leave a fine day. Some lengthy sunny spells developing, and continuing this way into the afternoon. Light winds, and feeling warm in the sunshine. Maximum Temperature 21C.

Tonight 16 Jun South West England

Any cloud gradually melting away to leave some late sunshine for many. Staying dry overnight with fog patches developing inland under the clear skies. Generally mild but becoming locally cool in the countryside. Perhaps turning somewhat cloudier in Cornwall later. Minimum Temperature 8C.

Tue 17 Jun South West England

Any early mist and fog soon clearing, then dry, warm and sunny for most. A little cloudier and cooler in Cornwall and north Devon and slightly breezier than on Monday. Maximum Temperature 22C.

Wed 18 Jun South West England

Generally fine and warm with plenty of strong sunshine. Perhaps cloudier and windier on Friday with a few showers possible. Becoming very warm in places, but cooler on many coasts.

Thu 19 Jun South West England

Generally fine and warm with plenty of strong sunshine. Perhaps cloudier and windier on Friday with a few showers possible. Becoming very warm in places, but cooler on many coasts.

Fri 20 Jun South West England

Generally fine and warm with plenty of strong sunshine. Perhaps cloudier and windier on Friday with a few showers possible. Becoming very warm in places, but cooler on many coasts.

Sat 21 Jun South West England

Very warm or hot conditions will likely be the focus of the weather over the weekend and into the start of next week. Temperatures could remain in the low thirties of Celsius across parts of England, with a small chance of approaching mid thirties in some places. Heatwave thresholds may continue to be exceeded across parts of the UK at first. Temperatures overnight will also be very warm and perhaps humid for much of the UK. Across the west of the British Isles, cloudier conditions could bring showers with the odd lightning flash. Winds will also be light for most, and moderate around coasts further west. From early mid week, signs are the heat will ease, with rain and showers, and less hot conditions, perhaps moving in from the west.

Sun 22 Jun South West England

Very warm or hot conditions will likely be the focus of the weather over the weekend and into the start of next week. Temperatures could remain in the low thirties of Celsius across parts of England, with a small chance of approaching mid thirties in some places. Heatwave thresholds may continue to be exceeded across parts of the UK at first. Temperatures overnight will also be very warm and perhaps humid for much of the UK. Across the west of the British Isles, cloudier conditions could bring showers with the odd lightning flash. Winds will also be light for most, and moderate around coasts further west. From early mid week, signs are the heat will ease, with rain and showers, and less hot conditions, perhaps moving in from the west.

Portland Harbour Weather Forecast

Today 16 Jun South West England

Tonight 16 Jun South West England

Tue 17 Jun South West England

Wed 18 Jun South West England

Thu 19 Jun South West England

Fri 20 Jun South West England

Sat 21 Jun South West England

Sun 22 Jun South West England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portland Harbour Temperature Statistics

June Temperature

Isle Of Portland (6km)

Lowest 8 January, 2025

Average 2025

Highest 3 May, 2025

Lowest 5 May, 2025

Average May

Highest 3 May, 2025

Lowest 8 June, 2025

Average June

Highest 13 June, 2025

Climate (2020–Present)

Isle Of Portland (6km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025