Cornwall Weather in September
Cornwall in September
The short of it: Cornwall in September averages a high of 20 °C (67 °F) and a low of 10 °C (51 °F), with 104 mm (4.1 in) of rain and about 12 h 28 min of daylight. Rated 3 of 5 for a visit; the best months are July and August. Source: TerraClimate climate normals, 1991–2020.
Average high 20° · low 10° · rain 104 mm · daylight 12 h 28 min
✦✦✦ Fair for a visit · best months: July & August
Thirty years of records give Cornwall an average September high of 20°, a low of 10° and some 104 mm of rain. The year turns hard here: highs drop 4° from August to about 20°, with nights near 10°. Wet spells are common — about 104 mm, the 4th wettest month.
The sun is up for about 12 h 28 min in mid-September, 101 minutes less than a month before.
For the traveller: pack layers, a wool coat and stout boots, and an oilskin besides. The Almanac rates September 3 of 5 for a visit; the finest months here are July and August.
Against its neighbours, Cornwall runs warmer than most and wetter than most in September. Clyde River, 4 km to the WSW, sees much the same highs.
September in Cornwall, by the numbers
- Warmth rank
- 3rd warmest of 12
- Rain rank
- 4th wettest of 12
- Versus August
- 4° colder, 26 mm more rain
- Versus October
- 6° warmer
- Day–night spread
- 9°
- Snow season
- Dec–Apr
- Daylight, mid-month
- 12 h 28 min
- Average wind
- 17 km/h
Neighbouring Towns
September averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| Clyde RiverPrince Edward Island | 4 km WSW | 20° | 10° | 104 mm |
| Lewis PointPrince Edward Island | 5 km ENE | 20° | 11° | 101 mm |
| West RoyaltyPrince Edward Island | 6 km NE | 20° | 11° | 101 mm |
| BrightonPrince Edward Island | 6 km E | 20° | 11° | 102 mm |
| Spring ParkPrince Edward Island | 6 km ENE | 20° | 11° | 102 mm |
| Downtown CharlottetownPrince Edward Island | 7 km E | 20° | 11° | 102 mm |
| CharlottetownPrince Edward Island | 7 km E | 20° | 11° | 102 mm |
| Mt. EdwardPrince Edward Island | 8 km ENE | 20° | 11° | 101 mm |