Portsmouth Harbour - Portchester Castle Weather Forecast, Hampshire

Today 16 Nov London and South East England

Early cloud and light rain clearing south through the morning, A mainly fine afternoon follows with some late sunny spells, or clear spells developing into the evening. However, it will be feeling cooler than recently, especially in the developing breeze. Maximum Temperature 10C.

Tonight 16 Nov London and South East England

Cold with clear spells and brisk winds. Most parts will stay dry, with frost possible, most likely in the west. Perhaps the odd shower moving into Kent towards dawn. Minimum Temperature 1C.

Mon 17 Nov London and South East England

Fine with plenty of sunshine, but feeling much colder than recent days. This most notable in the east, with brisk winds. Any showers across Kent soon moving off-shore again. Maximum Temperature 8C.

Tue 18 Nov London and South East England

Cold start Tuesday, before cloud and rain, spreads south and east. Staying cold Wednesday and Thursday, but with plenty of fine and sunny weather. Often windy, particularly Wednesday. Overnight frosts.

Wed 19 Nov London and South East England

Cold start Tuesday, before cloud and rain, spreads south and east. Staying cold Wednesday and Thursday, but with plenty of fine and sunny weather. Often windy, particularly Wednesday. Overnight frosts.

Thu 20 Nov London and South East England

Cold start Tuesday, before cloud and rain, spreads south and east. Staying cold Wednesday and Thursday, but with plenty of fine and sunny weather. Often windy, particularly Wednesday. Overnight frosts.

Fri 21 Nov London and South East England

A cold northerly flow will affect the UK initially, with widespread overnight frosts, below average temperatures and frequent wintry showers, these primarily in exposed northern, eastern and western coastal counties, but may feed farther inland in some places. Towards the end of the week and beyond, a transition to a milder but more unsettled regime is likely, as Atlantic frontal systems track eastwards across or near the UK. This will bring a chance of more widespread spells of rain or showers at times, perhaps with some occasional hill snow in the north, and the risk of some strong winds. Temperatures will tend to fluctuate from day to day, but overall will likely be close to average.

Sat 22 Nov London and South East England

A cold northerly flow will affect the UK initially, with widespread overnight frosts, below average temperatures and frequent wintry showers, these primarily in exposed northern, eastern and western coastal counties, but may feed farther inland in some places. Towards the end of the week and beyond, a transition to a milder but more unsettled regime is likely, as Atlantic frontal systems track eastwards across or near the UK. This will bring a chance of more widespread spells of rain or showers at times, perhaps with some occasional hill snow in the north, and the risk of some strong winds. Temperatures will tend to fluctuate from day to day, but overall will likely be close to average.

Portsmouth Harbour - Portchester Castle Weather Forecast

Today 16 Nov London and South East England

Tonight 16 Nov London and South East England

Mon 17 Nov London and South East England

Tue 18 Nov London and South East England

Wed 19 Nov London and South East England

Thu 20 Nov London and South East England

Fri 21 Nov London and South East England

Sat 22 Nov London and South East England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Portsmouth Harbour - Portchester Castle Temperature Statistics

November Temperature

Thorney Island (13km)

Lowest 4 January, 2025

Average 2025

Highest 12 August, 2025

Lowest 26 October, 2025

Average October

Highest 6 October, 2025

Lowest 9 November, 2025

Average November

Highest 13 November, 2025

Climate (2020–Present)

Thorney Island (13km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025