03/09/2025 – Weather in Cornwall – Yellow Weather Warning For Rain

Published On: 3 September 2025Last Updated: 3 September 2025By CornishStuff

A yellow weather warning has been issued by the Met Office for heavy rain across Cornwall, in place from 00:00 to 14:00 today, Wednesday 3rd September 2025.

The Met Office warns that the conditions could cause travel disruption and flooding in places.

What to Expect

According to the warning, the impacts could include:

Flooding of a few homes and businesses
Some interruption to power supplies and other services
Spray and flooding on roads, probably making journey times longer
Bus and train services likely affected, with delays expected

The Met Office explained:

“Heavy rain may cause travel disruption and flooding in places.”

Weather Details

Heavy rain and strong winds are forecast to move northeast through the first part of the day. These will be followed by heavy showers and some thunderstorms, which should become more isolated through the afternoon.

Rainfall totals are expected to be widely 20 to 30 mm, though some areas could see 40 to 60 mm within 6 to 9 hours.

Coastal gales are also likely for a time, particularly along English Channel coasts.

Safety Advice

The Met Office advises travellers and residents to take precautions.

“Give yourself the best chance of avoiding delays by checking road conditions if driving, or bus and train timetables, amending your travel plans if necessary.”
“Check if your property could be at risk of flooding. If so, consider preparing a flood plan and an emergency flood kit.”
“Be prepared for weather warnings to change quickly: when a weather warning is issued, the Met Office recommends staying up to date with the weather forecast in your area.”

Why Yellow?

The Met Office explained the warning is yellow because it has a medium likelihood but a low impact overall.

South West England weather forecast

Headline:

Windy with heavy rain followed by sunshine and blustery showers.

Today:

Widely wet and windy through the morning, with heavy, sometimes thundery spells of rain at times. Brighter skies developing by the afternoon bringing a mixture of sunshine and blustery heavy showers. Maximum temperature 21 °C.

Tonight:

A few showers this evening but most places dry with some late sunny spells. Turning cloudier overnight with showery outbreaks of rain, mainly in the south by dawn. Winds easing. Minimum temperature 10 °C.

Thursday:

Heavy showery rain clearing eastwards through the morning followed by a scattering of showers and sunny intervals. Breezy at times during the afternoon. Maximum temperature 20 °C.

Outlook for Friday to Sunday:

More settled on Friday and Saturday with a few light showers, but mainly dry and bright. Turning unsettled again on Sunday with outbreaks of rain and stronger winds.

Updated: 05:00 (UTC+1) on Wed 3 Sep 2025