St. Thomas Weather in September
St. Thomas in September
The short of it: St. Thomas in September averages a high of 22 °C (72 °F) and a low of 12 °C (53 °F), with 82 mm (3.2 in) of rain and about 12 h 26 min of daylight. Rated 3 of 5 for a visit; the best months are September and June. Source: TerraClimate climate normals, 1991–2020.
Average high 22° · low 12° · rain 82 mm · daylight 12 h 26 min
✦✦✦ Fair for a visit · best months: September & June
September in St. Thomas brings afternoons near 22° and nights around 12°, with about 82 mm of rain over the month. Much like August: highs about 22°, nights near 12°. Easy travelling weather. Wet spells are common — about 82 mm, the 7th wettest month.
The sun is up for about 12 h 26 min in mid-September, 89 minutes less than a month before.
For the traveller: pack light clothes and a jacket for the evening, and an oilskin besides. The Almanac rates September 3 of 5 for a visit; it is the best month of the year to come.
Against its neighbours, St. Thomas runs warmer than most and drier than most in September. Aylmer, 16 km to the E, sees much the same highs.
September in St. Thomas, by the numbers
- Warmth rank
- 4th warmest of 12
- Rain rank
- 7th wettest of 12
- Versus August
- 4° colder, 4.0 mm more rain
- Versus October
- 7° warmer
- Day–night spread
- 11°
- Snow season
- Dec–Mar
- Daylight, mid-month
- 12 h 26 min
- Average wind
- 12 km/h
Neighbouring Towns
September averages · distance by the crow’s flight| Town | Distance | High | Low | Rain |
|---|---|---|---|---|
| AylmerOntario | 16 km E | 22° | 12° | 81 mm |
| LondonOntario | 24 km N | 23° | 12° | 86 mm |
| DorchesterOntario | 25 km NNE | 22° | 11° | 84 mm |
| IngersollOntario | 38 km NE | 22° | 11° | 84 mm |
| TillsonburgOntario | 38 km ENE | 22° | 12° | 80 mm |
| StrathroyOntario | 41 km WNW | 23° | 12° | 86 mm |
| St. MarysOntario | 53 km N | 22° | 11° | 95 mm |
| WoodstockOntario | 53 km NE | 22° | 11° | 82 mm |