Sarnia Weather in September
Sarnia in September
The short of it: Sarnia in September averages a high of 23 °C (74 °F) and a low of 13 °C (55 °F), with 89 mm (3.5 in) of rain and about 12 h 26 min of daylight. Rated 3 of 5 for a visit; the best months are July and September. Source: TerraClimate climate normals, 1991–2020.
Average high 23° · low 13° · rain 89 mm · daylight 12 h 26 min
✦✦✦ Fair for a visit · best months: July & September
September in Sarnia brings afternoons near 23° and nights around 13°, with about 89 mm of rain over the month. Much like August: highs about 23°, nights near 13°. Easy travelling weather. Wet spells are common — about 89 mm, the 2nd wettest month.
The sun is up for about 12 h 26 min in mid-September, 90 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; the finest months here are July and September.
Against its neighbours, Sarnia runs warmer than most and about as wet in September. Port Huron, 2 km to the WSW, sees much the same highs.
September in Sarnia, by the numbers
- Warmth rank
- 4th warmest of 12
- Rain rank
- 2nd wettest of 12
- Versus August
- 3° colder, 17 mm more rain
- Versus October
- 7° warmer
- Day–night spread
- 10°
- 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 |
|---|---|---|---|---|
| Port HuronMichigan | 2 km WSW | 24° | 13° | 88 mm |
| MarysvilleMichigan | 10 km SW | 23° | 13° | 88 mm |
| CorunnaOntario | 11 km SSW | 23° | 13° | 89 mm |
| Saint ClairMichigan | 19 km SSW | 23° | 13° | 90 mm |
| CamlachieOntario | 21 km ENE | 23° | 12° | 91 mm |
| PetroliaOntario | 23 km ESE | 23° | 12° | 94 mm |
| RichmondMichigan | 34 km WSW | 23° | 12° | 78 mm |
| New BaltimoreMichigan | 43 km SW | 23° | 13° | 78 mm |