Year-round weather and climate in St. Catharines, Canada
Average temperatures in St. Catharines run from an average low of -4°C25°F in February up to an average high of 27°C81°F in July. September is the driest month at 7 rainy days; December the wettest at 17 rainy days. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 137K
- Currency
- CAD
- Language
- English / French
- Time zone
- Toronto
Best time to visit
The most pleasant weather falls in July, August, and September, offering a perfect balance of comfortable temperatures and clear skies.
Rain character
Moderate Showers: Rainfall is standard and manageable. A compact travel umbrella or light rain jacket will easily get you through any wet days.
Day-to-night swing
Evening Chill: Temperatures drop by a noticeable <span class="val-c">8°C</span><span class="val-f">14°F</span> when the sun goes down. A light sweater or jacket is usually all you need for evening plans.
Seasonality Profile
True Four Seasons: Dramatic contrasts. Freezing winters, transitional shoulders, and blazing summers.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
All-Day Strolling: Weather is generally forgiving for long walking days. Comfortable sneakers are your most important packing item.
Average temperatures, sunshine, and rainfall
Average monthly weather in St. Catharines, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Sep is typically driest at 7 rainy days (51mm); Dec the wettest at 17 rainy days (95mm).
| Month | Average high | Average low | Daily sunshine | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 1°C / 34°F | -3°C / 26°F | 4h | 13 | 79mm |
| Feb | 3°C / 37°F | -4°C / 25°F | 7h | 10 | 50mm |
| Mar | 7°C / 45°F | 0°C / 32°F | 7h | 13 | 68mm |
| Apr | 13°C / 55°F | 4°C / 40°F | 9h | 15 | 129mm |
| May | 18°C / 64°F | 10°C / 50°F | 11h | 11 | 83mm |
| Jun | 24°C / 75°F | 16°C / 61°F | 12h | 12 | 71mm |
| Jul | 27°C / 81°F | 20°C / 67°F | 13h | 12 | 76mm |
| Aug | 25°C / 77°F | 19°C / 65°F | 11h | 14 | 105mm |
| Sep | 22°C / 72°F | 16°C / 60°F | 10h | 7 | 51mm |
| Oct | 17°C / 62°F | 11°C / 51°F | 8h | 11 | 71mm |
| Nov | 9°C / 48°F | 4°C / 39°F | 6h | 12 | 61mm |
| Dec | 4°C / 39°F | -1°C / 30°F | 3h | 17 | 95mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit St. Catharines?
July is the sunniest month in St. Catharines, averaging 13 hours of sunshine a day. Pack sunglasses and high-SPF sunscreen.
What clothes should I pack for St. Catharines?
Your packing list depends entirely on when you travel. Temperatures in St. Catharines swing from an average low of -4°C25°F in February up to 27°C81°F in July. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for St. Catharines?
St. Catharines gets rain on about 147 days a year, with December being the wettest. If you're traveling then, pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in St. Catharines with Packola.
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