Temperature
Cool by day, cold at night.
Cornwall is usually most comfortable from July to September. Typical daytime highs range from 47–67°F across the year. Rain varies by season.

Cool by day, cold at night.
Rain is frequent. About 15 wet days, the highest monthly average.
Cloudier spells limit sunshine.
Humidity is rarely noticeable in the cool air.
In November, afternoons feel about 43° and nights feel near 39°.
Mostly cloudy skies this month.
Breezy November days can feel brisker in open spots.
November late afternoons are around 49°F, easing to about 47°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 47 | 39 | 3.4 | 14 | 4.5 | 88 | 51 |
| Feb | 47 | 39 | 3.0 | 12 | 6.0 | 86 | 49 |
| Mar | 50 | 40 | 2.9 | 13 | 7.7 | 84 | 49 |
| Apr | 54 | 42 | 2.9 | 13 | 10.5 | 81 | 51 |
| May | 59 | 47 | 3.2 | 13 | 11.5 | 81 | 54 |
| Jun | 64 | 52 | 3.1 | 13 | 11.8 | 82 | 58 |
| Jul | 67 | 55 | 3.2 | 13 | 11.4 | 83 | 61 |
| Aug | 66 | 55 | 3.1 | 13 | 10.5 | 85 | 63 |
| Sep | 63 | 52 | 2.6 | 11 | 9.0 | 86 | 63 |
| Oct | 58 | 49 | 3.9 | 15 | 6.7 | 88 | 60 |
| Nov | 52 | 44 | 3.6 | 15 | 5.2 | 88 | 56 |
| Dec | 48 | 40 | 3.8 | 15 | 4.2 | 88 | 53 |
Similar climates
Want a side-by-side climate view? Compare Cornwall with Aberystwyth.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 11, 2026
Data & methodology