Rainbow Bar Weather Forecast, Hampshire

Today 15 Sep London and South East England

Windy, with some sunny spells but also blustery scattered sharp showers. These showers will mainly affect the west at first, but should become more generalised later. Gales likely in exposure, making it feel cooler than temperatures may suggest. Maximum Temperature 19C.

Tonight 15 Sep London and South East England

Becoming generally dry overnight, with the blustery showers becoming lighter, fewer and further between during the evening. Remaining windy, with some clear spells developing by dawn. Minimum Temperature 10C.

Tue 16 Sep London and South East England

Cloudy in northern areas, however elsewhere mainly fine with some sunshine, this becoming hazy as cloud thickens later. Feeling warmer as winds ease. Maximum Temperature 20C.

Wed 17 Sep London and South East England

Unsettled through the period, but particularly wet and windy on Wednesday. More in the way of sunny spells expected later in the week. Near-average temperatures by day, mild by night.

Thu 18 Sep London and South East England

Unsettled through the period, but particularly wet and windy on Wednesday. More in the way of sunny spells expected later in the week. Near-average temperatures by day, mild by night.

Fri 19 Sep London and South East England

Unsettled through the period, but particularly wet and windy on Wednesday. More in the way of sunny spells expected later in the week. Near-average temperatures by day, mild by night.

Sat 20 Sep London and South East England

The broadly unsettled conditions look to continue during the first part of this period. All areas are likely to see some further spells of wet and at times windy weather, interspersed with brighter, showery interludes. By the start of the following week, a ridge of high pressure may extend eastwards towards the UK, bringing an increasing chance of longer periods of drier weather to northern areas initially, whilst low pressure remains closer to the south or southeast. Towards the end of this period, high pressure may be rather more dominant across the UK. A cooler interlude is likely for a time through next week, with chilly nights and fog patches likely under the influence of high pressure. Temperatures probably return closer to average by late September.

Sun 21 Sep London and South East England

The broadly unsettled conditions look to continue during the first part of this period. All areas are likely to see some further spells of wet and at times windy weather, interspersed with brighter, showery interludes. By the start of the following week, a ridge of high pressure may extend eastwards towards the UK, bringing an increasing chance of longer periods of drier weather to northern areas initially, whilst low pressure remains closer to the south or southeast. Towards the end of this period, high pressure may be rather more dominant across the UK. A cooler interlude is likely for a time through next week, with chilly nights and fog patches likely under the influence of high pressure. Temperatures probably return closer to average by late September.

Rainbow Bar Weather Forecast

Today 15 Sep London and South East England

Tonight 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

Fri 19 Sep London and South East England

Sat 20 Sep London and South East England

Sun 21 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 14 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