A yellow thunderstorm warning has been issued by the Met Office as parts of the UK are expected to be battered by lightning and hail.
The alert came into force just after 8am and will be in effect until midday across parts of Wales and England.
Areas that will be hit the worst include Gloucester, Salisbury, Bath and Newport.
Forecasters warned of difficult driving conditions and urged people to take care on the roads.
There is a small chance of homes and businesses experiencing power cuts, being flooded or getting damaged by water, lightning strikes, hail or strong winds.
There may be a disruption to train and bus services as commuters are told to check before they travel.
A stretch of heavy rain and thunderstorms will move northwards across the day.
Some 30-40mm of downpour and frequent lightning and hail are expected, according to the Met Office.
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The storm towards the north-west has triggered the yellow thunderstorm warning
| WXCHARTSMeteorologist Ellie Glaisyer said: "It's a very windy start for many of us out there this morning, particularly across the west, where we've seen some coastal gales.
"We'll continue to see some very strong winds as we go throughout much of Sunday.
"A bit of a brighter start across eastern areas this morning, plenty of hazy sunshine on offer through the afternoon, but further west a bit of a wetter picture.
"Some outbreaks of heavy, showery rain push their way northwards as we go through this afternoon."
The alert came into force just after 8am and will be in effect until midday across parts of Wales and England
|MET OFFICE
The weather comes just before a total lunar eclipse expected to be visible in parts of England and Wales on Sunday night.
The moon is to turn a deep, dark red, sometimes called a "blood moon".
This occurs as the Earth passes directly between the sun and the moon, casting its shadow across the lunar surface, for the first time since 2022.
Where skies are clear, the eclipse will be visible at around 7.30pm.
Some 30-40mm of downpour and frequent lightning and hail are expected
|PA
Lunar eclipses are not always "total" and for UK observers, a total eclipse hasn't been visible since 2022, and will not occur again until August 2026.
It will slowly move out of the Earth's shadow until 9:55pm, giving stargazers in the UK just over two hours to see the eclipse.
Those in easternmost Africa, the Middle East, most of Asia, and western Australia can witness the entire event from start to finish, while UK observers will catch the latter stages.
Stargazers will hope the cloudy skies expected overhead during the day clear up before the lunar eclipse tonight.