St. Catharines in September
7.7out of 10
Yes, a good time to go
Mild: highs around 21°C. Frequent rain: about 9 rainy days.
21°CAvg high
16°CAvg low
9Rainy days (84 mm)
12:17 hDaylight
07:03Sunrise · 19:20 Sunset
Why this score
- Mild: highs around 21°C
- Frequent rain: about 9 rainy days
What to wear and pack
- Layers you can add or remove
- Rain jacket or compact umbrella
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (2.8 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 0°C | -5°C | 76 mm | 12 | – | – | 3.5 |
| February | 0°C | -6°C | 60 mm | 9 | – | – | 3.9 |
| March | 4°C | -2°C | 73 mm | 10 | – | – | 4.6 |
| April | 10°C | 4°C | 97 mm | 11 | – | – | 5.5 |
| May | 16°C | 10°C | 84 mm | 11 | – | – | 6.5 |
| June | 22°C | 16°C | 92 mm | 11 | – | – | 7.5 |
| July | 25°C | 20°C | 87 mm | 11 | – | – | 7.6 |
| August | 25°C | 19°C | 76 mm | 10 | – | – | 7.8 |
| September | 21°C | 16°C | 84 mm | 9 | – | – | 7.7 |
| October | 15°C | 10°C | 92 mm | 12 | – | – | 6.2 |
| November | 8°C | 4°C | 82 mm | 11 | – | – | 5.4 |
| December | 3°C | -1°C | 78 mm | 12 | – | – | 4.3 |
Frequently asked questions
How hot is St. Catharines in September?
Daytime highs average 21°C and nights about 16°C.
When is the best time to visit St. Catharines?
The best months are August, September, July, June.