St. Catharines Climate by Month
St. Catharines, Ontario, Canada
Warm summers and freezing winters, with rain spread through the year.
St. Catharines has warm summers and freezing winters, with rain spread through the year. Expect highs of 81°F (27°C) in July and 33°F (0°C) in January, with the coldest nights (January) near 20°F (-6°C). About 34 in (856 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 81°F(27°C)
- Average high, July
- Coldest nights
- 20°F(-6°C)
- Average low, January
- Rain per year
- 34 in(856 mm)
- No clear rainy season
- Humidity
- 75%
- Sunniest: June
Best and worst months in St. Catharines
Best for weatherJune and September are the best time for weather in St. Catharines: highs near 74°F (23°C) and about 3.2 in (81 mm) of rain a month.
Least pleasantJanuary and February are the least pleasant; January is the coldest, with highs of only 33°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in June.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
St. Catharines weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 33°F(0°C) | 20°F(-6°C) | 2.4 in(60 mm) | 82% | 1.4 |
| FebFebruary | 34°F(1°C) | 21°F(-6°C) | 2.0 in(51 mm) | 79% | 2.3 |
| MarMarch | 42°F(5°C) | 28°F(-2°C) | 2.0 in(52 mm) | 73% | 3.4 |
| AprApril | 54°F(12°C) | 37°F(3°C) | 3.3 in(85 mm) | 68% | 4.4 |
| MayMay | 66°F(19°C) | 47°F(9°C) | 3.2 in(82 mm) | 69% | 5.5 |
| JunJuneBest | 76°F(24°C) | 58°F(14°C) | 3.3 in(85 mm) | 72% | 5.9 |
| JulJuly | 81°F(27°C) | 64°F(18°C) | 3.2 in(81 mm) | 71% | 5.9 |
| AugAugust | 79°F(26°C) | 63°F(17°C) | 2.8 in(72 mm) | 74% | 5.2 |
| SepSeptemberBest | 72°F(22°C) | 56°F(13°C) | 3.0 in(76 mm) | 74% | 4.1 |
| OctOctober | 60°F(15°C) | 45°F(7°C) | 3.0 in(75 mm) | 75% | 2.4 |
| NovNovember | 48°F(9°C) | 35°F(2°C) | 2.8 in(72 mm) | 79% | 1.5 |
| DecDecember | 38°F(3°C) | 26°F(-3°C) | 2.6 in(65 mm) | 82% | 1.1 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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