Old Town Weather Forecast, Cornwall TR21 0

Today 18 Aug South West England

Another breezy day for some western areas, and locally windy across Cornwall, with a chance of heavy, perhaps thundery showers later. Elsewhere, hazy sunny periods are expected. It will feel warm in the sunshine. Maximum Temperature 24C.

Tonight 18 Aug South West England

Remaining dry with clear spells in the east, but cloudier across Devon and Cornwall with a risk of an isolated shower, perhaps with the odd rumble of thunder. Minimum Temperature 12C.

Tue 19 Aug South West England

A continued risk of showers on Tuesday, these locally heavy, but for many it will be a cloudy day with sunny spells. Feeling warm in the sunshine. Maximum Temperature 24C.

Wed 20 Aug South West England

Remaining dry and settled for the rest of the week with a mixture of cloud and sunny periods. Lower temperatures than of late but feeling warm in any sunshine.

Thu 21 Aug South West England

Remaining dry and settled for the rest of the week with a mixture of cloud and sunny periods. Lower temperatures than of late but feeling warm in any sunshine.

Fri 22 Aug South West England

Remaining dry and settled for the rest of the week with a mixture of cloud and sunny periods. Lower temperatures than of late but feeling warm in any sunshine.

Sat 23 Aug South West England

High pressure is likely to be the dominant feature at first bringing widely fine and dry weather whilst a generally northerly flow leads to rather cool conditions. This will be increasingly eroded from the west as frontal systems start to move in from the Atlantic through the weekend, leading to more changeable conditions. Whilst this is happening a deep area of low pressure is likely to develop in the North Atlantic, linked to Hurricane Erin. This likely progresses towards the UK through the early part of the week. The changeable period will likely continue through the last week of August, especially in the north and west, with a small chance of widely wetter and windier weather developing. The evolution of this is highly uncertain though.

Sun 24 Aug South West England

High pressure is likely to be the dominant feature at first bringing widely fine and dry weather whilst a generally northerly flow leads to rather cool conditions. This will be increasingly eroded from the west as frontal systems start to move in from the Atlantic through the weekend, leading to more changeable conditions. Whilst this is happening a deep area of low pressure is likely to develop in the North Atlantic, linked to Hurricane Erin. This likely progresses towards the UK through the early part of the week. The changeable period will likely continue through the last week of August, especially in the north and west, with a small chance of widely wetter and windier weather developing. The evolution of this is highly uncertain though.

Old Town Weather Forecast

Today 18 Aug South West England

Tonight 18 Aug South West England

Tue 19 Aug South West England

Wed 20 Aug South West England

Thu 21 Aug South West England

Fri 22 Aug South West England

Sat 23 Aug South West England

Sun 24 Aug South West England

Temperature Forecast Met Office

Temperature Real-Time

Predannack (Cornwall) Radar

National Satellite

National Synoptic

Old Town Temperature Statistics

August Temperature

Scilly St Marys (0km)

Lowest 8 February, 2025

Average 2025

Highest 13 August, 2025

Lowest 4 July, 2025

Average July

Highest 11 July, 2025

Lowest 2 August, 2025

Average August

Highest 13 August, 2025

Climate (2020–Present)

Scilly St Marys (0km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025