Rainbow Bar Weather Forecast, Hampshire

Today 12 Sep London and South East England

Mostly dry start with sunny spells. However, cloud soon building, with a day of sunny intervals and occasional showers following. The odd heavy shower remains possible, perhaps thundery, along with blustery winds. However some eastern parts will stay dry throughout. Maximum Temperature 19C.

Tonight 12 Sep London and South East England

Clear spells through the evening, but with isolated showers continuing to move inland from the English Channel. More widespread heavy showers spreading northeast after midnight, heavy at times. Gusty winds. Minimum Temperature 10C.

Sat 13 Sep London and South East England

Mostly fine and sunny start, but with a few showers continuing, mainly along the Thames Estuary. Cloud then building elsewhere with sunny spells and occasional showers following. Staying breezy. Maximum Temperature 19C.

Sun 14 Sep London and South East England

Rain quickly moving northeast Sunday, clearing to sunshine and blustery showers. Strong gusty winds and coastal gales follow, continuing overnight and Monday, with showers. Drier, sunnier Tuesday with winds easing.

Mon 15 Sep London and South East England

Rain quickly moving northeast Sunday, clearing to sunshine and blustery showers. Strong gusty winds and coastal gales follow, continuing overnight and Monday, with showers. Drier, sunnier Tuesday with winds easing.

Tue 16 Sep London and South East England

Rain quickly moving northeast Sunday, clearing to sunshine and blustery showers. Strong gusty winds and coastal gales follow, continuing overnight and Monday, with showers. Drier, sunnier Tuesday with winds easing.

Wed 17 Sep London and South East England

Likely a continuation of the unsettled theme to begin, with further spells of unsettled weather bringing a risk of heavy rain and also the potential for some periods of stronger winds. Later in the period, there may be a trend toward more in the way of settled and drier interludes interspersed with further periods of rain and showers. These look more likely across southern areas of the UK, but may extend to other parts at times. Temperatures will likely be close to average or slightly below overall, but if we start to see more in the way of dry weather later in the period, temperatures could recover back to a little above average at times.

Thu 18 Sep London and South East England

Likely a continuation of the unsettled theme to begin, with further spells of unsettled weather bringing a risk of heavy rain and also the potential for some periods of stronger winds. Later in the period, there may be a trend toward more in the way of settled and drier interludes interspersed with further periods of rain and showers. These look more likely across southern areas of the UK, but may extend to other parts at times. Temperatures will likely be close to average or slightly below overall, but if we start to see more in the way of dry weather later in the period, temperatures could recover back to a little above average at times.

Rainbow Bar Weather Forecast

Today 12 Sep London and South East England

Tonight 12 Sep London and South East England

Sat 13 Sep London and South East England

Sun 14 Sep London and South East England

Mon 15 Sep London and South East England

Tue 16 Sep London and South East England

Wed 17 Sep London and South East England

Thu 18 Sep London and South East England

Temperature Forecast Met Office

Temperature Real-Time

Dean Hill (Wiltshire) Radar

National Satellite

National Synoptic

Rainbow Bar Temperature Statistics

September Temperature

Thorney Island (22km)

Lowest 4 January, 2025

Average 2025

Highest 12 August, 2025

Lowest 6 August, 2025

Average August

Highest 12 August, 2025

Lowest 5 September, 2025

Average September

Highest 6 September, 2025

Climate (2020–Present)

Thorney Island (22km)

Average Low 2020–2025

Average 2020–2025

Average High 2020–2025