The South West Coast Path goes through Somerset, Devon, and Cornwall. If you start in May, the weather varies but is usually mild.
In Somerset, expect temperatures between 12-15°C during the day and 6-10°C at night. It rains often, mostly light rain, but sometimes can be heavy. Some days will be cloudy with little sunshine.
In Devon, temperatures are a bit higher, around 16-17°C during the day and 10-12°C at night. Rain is still common, but there are more sunny and partly cloudy days than in Somerset. Cloudy skies are still frequent.
In Cornwall, the daytime temperatures are 16-18°C and night temperatures are 11-13°C. Expect a mix of light and heavy rain, with many cloudy days. However, there will be enough sunny periods to enjoy.
Overall, be ready for varying weather with mild temperatures and quite a bit of rain, but also some sunny and partly cloudy days.
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