Wednesday 26 August is expected to start damp and cloudy, with mist possible early on and a high chance of rain through the morning.
Conditions should improve gradually later, with brighter spells developing into the afternoon and temperatures reaching around 24C.
Early morning
Wednesday will begin mild but grey, with mist possible around dawn and a 30% chance of rain at 5am.
Temperatures are expected to stay around 16C from 5am to 7am, feeling much the same.
The chance of rain increases from 50% at 6am to 60% by 7am, with cloudy or rainy conditions expected.
Winds will be light, from the north-east or east-north-east at around 3mph, with gusts of 11mph to 12mph. Visibility may be moderate at first, and humidity will be high at around 93% to 94%.
Midday
The unsettled theme continues through the morning, with an 80% chance of rain between 8am and 10am.
Temperatures will rise slowly from 17C at 8am to 18C at 10am, then 19C by 11am and 20C at midday.
Rain remains possible around lunchtime, with the chance of precipitation at 70% at 11am and 60% by midday.
Winds will stay light, mainly from the east or east-south-east at around 3mph. Gusts are expected to be around 13mph. Visibility should improve from moderate to good, while humidity gradually falls from 91% at 8am to 83% by midday.
Afternoon
The afternoon should become brighter, with sunny intervals and cloud.
Temperatures are forecast to reach 21C at 1pm and around 23C by 2pm, staying close to 23C through the afternoon. It may feel slightly warmer, around 24C to 25C at times.
The chance of rain eases through the afternoon, falling from 60% at 1pm to 50% at 2pm and 40% by 3pm and 4pm.
Winds will be from the east or east-south-east at around 4mph to 5mph, with gusts of 17mph to 18mph. Visibility should be very good later in the afternoon. UV levels will peak around moderate.
Evening
The evening will be mostly cloudy with some late brightness at first.
Temperatures will ease from around 24C at 5pm to 23C at 6pm, 22C at 7pm and 21C by 8pm. Later in the evening, temperatures will fall to around 18C by 11pm.
The chance of rain reduces from 30% between 5pm and 7pm to 20% at 8pm, 10% at 9pm and below 5% by 10pm.
Winds will remain light from the east or east-north-east, easing from around 6mph to 4mph. Gusts will fall from around 17mph early in the evening to 12mph by 11pm.
Visibility should remain very good, while humidity will rise again through the evening, reaching around 88% late on.
