August · United Kingdom
Best time to visit Cornwall in August Weather, crowds & prices
Weather in Cornwall in August
Average temperature 18°C, 63 mm of rain, about 19 days with 6+ hours of sunshine and 82% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
6.4/10
Ranked #1 of 12 months
- Avg temp
- 18°C
- Rainfall
- 63 mm
- Humidity
- 82%
- Days with 6h+ sun
- 19
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Cornwall scores 6.4/10 for beach and coastal travel - the single best month of the year. Expect around 18°C, 63 mm of rain, and roughly 19 days with 6+ hours of sunshine this month.
Cornwall's granite cliffs, surf beaches and fishing harbours fill England's south-west tip.
August in Cornwall tops the year's climate scores
August averages 18°C (64°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rainfall runs 63 mm, so plan one flexible day in three; you still get about 19 days with 6+ hours of sunshine and 14.3 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Cornwall at 6.4/10 — the reference point every other month on this page is measured against.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Cornwall in August?
- In August, Cornwall averages 18°C, 63 mm of rain, and about 19 days with 6+ hours of sunshine. Its climate-comfort score is 6.4/10.
- Is August a good time to visit Cornwall?
- August earns a 6.4/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cornwall in August?
- Expect about 63 mm of rain in August. Average humidity is 82% and there are about 19 days with 6+ hours of sunshine.
Curated in Cornwall
Tickets & experiences
Things to do in Cornwall
Cornwall, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.