Autumn equinox marks a change

[Updated 07:00 22/09/2020]

Sunny spells and showers. Near to Cardiff. Posted by hilett1978

The autumn equinox today is coinciding with a big change in the weather. There will be warms spells of sunshine, particularly in the south, but outbreaks of rain push into the north west. During the next 36 hours they spread southeastwards across the UK and introduce much cooler conditions. The chilly feel then lasts for the rest of the week and nighttime frosts are likely, particularly in the north.

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Sunny spells and showers. Near to Cardiff. Posted by hilett1978 View the full size picture.

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Tuesday starts wet in the far north west of the UK. Elsewhere it is dry but there is mist and fog locally. Through the day outbreaks of rain spread across Northern Ireland and western Scotland. Other areas stay mainly dry but a few showers probably break out in the west. The warmest and sunniest conditions will be in southern and central England.

Temperatures range from 12C (54F) in the north west to 25C (77F) in East Anglia. See the rain and lightning radar for the latest view.

Arpege forecast chart 1

Meteo France Arpege, rain, 16:00 BST Tue 22nd September

Tonight a band of rain pushes southeastwards. By the end of the night it stretches from north eastern England, down through Wales and into the south west. Ahead of it some showers are likely. Clearer conditions follow behind from the northwest and a patchy ground frost develops in Scotland.

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Tomorrow outbreaks of rain affect much of England and Wales. During the afternoon they become heavy in central and eastern counties. Scotland and Northern Ireland have brighter conditions but there will be scattered showers. Much cooler than recently in the south.

Arpege forecast chart 2

Meteo France Arpege, rain, 15:00 BST Wed 23rd September

Cool and mixed

During Thursday showery outbreaks of rain push eastwards across Northern Ireland, Wales and England. Much of Scotland remains mainly dry and bright. Cool for the time of year.

Through Friday outbreaks of rain could affect eastern and south eastern England. Elsewhere there will be sunny spells but showers are likely in the west. Temperatures remain low for late September. Quite windy.

The weekend is looking mixed. In the east showery rain is possible at times. There is also a chance of longer spells of rain on Saturday in Wales and south western England. Despite that there should be quite a lot of dry and bright weather. Cool with a risk of nighttime frosts in northern and western areas.

GFS chart 1

GFS, surface pressure and precipitation, 16:00 BST Fri 25th September

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