September · typical climate, not a forecast
Cornwall in September
United Kingdom
Workable
17°C day · 12°C night · 44% rain · 12h daylight · moderate crowds · €1,260 estimated
Live · Cornwall
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Reading…
Live · Tallinn (you)
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Reading…
Cool Score breakdown
Scored for 5 nights from Tallinn in September.
- Temperature fit96
17.3°C typical high vs your 12–20°C window
w 26 - Heat escape0
1°C warmer than Tallinn
w 14 - Rain probability62
44% chance of rain on an average day
w 11 - Daylight hours60
12.4h of daylight mid-month
w 8 - Outdoor conditions81
Comfortable for a full day outside at 17.3°C
w 10 - Crowding46
Moderate crowds for this month
w 8 - Flight + stay cost57
≈€1260 estimated for 5 nights vs €1000 budget
w 12 - Nature access80
8/10 — wild ground within reach
w 6 - City atmosphere62
5/10 urban texture · 8/10 food scene
w 4
Why Cornwall in September
Surfable Atlantic swell and 20°C on the hottest week of the year.
- South West Coast Path
- Cold Atlantic surf
- Harbour seafood
What September in Cornwall is actually like
In September, Cornwall sits around 17°C by day and drops to about 12°C after dark, so a light layer earns its place in the bag even in high summer. That is roughly 1°C warmer than Tallinn at the same time of year — the difference between planning your day around the shade and simply walking out of the door.
Expect rain on roughly 44% of days, usually passing rather than persistent, and about 12 hours of daylight to spend outside. Crowds are moderate crowds this month, and a 5-night trip from Tallinn works out at around €1,260 including flights, a mid-range stay and everyday spending.
Surfable Atlantic swell and 20°C on the hottest week of the year. Days here tend to fill up with south west coast path, cold atlantic surf, harbour seafood — which is why Cornwall scores 63 out of 100 for september: workable.
Other months
Compare the typical climate month by month.