St. Catharines 7-day weather forecast

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March 23, 2026
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St. Catharines 7-day weather forecast

created the forecast for St. Catharines, Ontario using data from . This week's high is 22 掳C on Monday, while the low is 0 掳C on Sunday. There are expected to be 0 sunny days and rain on 6 days this week.

There are currently no weather alerts.

Monday, April 13

- High of 22 掳C, low of 11 掳C (87% humidity)
- Overcast with a 100% chance of rain (1 mm of rain)
- Moderate risk of harm from sun exposure (4 UV index)
- Moderate breeze (48 km/h wind)
- Sunrise at 6:38 AM, sunset at 7:56 PM
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Tuesday, April 14

- High of 17 掳C, low of 10 掳C (95% humidity)
- Overcast with a 100% chance of rain (6 mm of rain)
- High risk of harm from sun exposure (5 UV index)
- Gentle breeze (36 km/h wind)
- Sunrise at 6:36 AM, sunset at 7:57 PM
2 / 6
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Wednesday, April 15

- High of 15 掳C, low of 12 掳C (94% humidity)
- Overcast with a 100% chance of rain (10 mm of rain)
- Gentle breeze (29 km/h wind)
- Sunrise at 6:34 AM, sunset at 7:58 PM
3 / 6
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Thursday, April 16

- High of 17 掳C, low of 12 掳C (83% humidity)
- Overcast with a 100% chance of rain (3 mm of rain)
- Moderate risk of harm from sun exposure (4 UV index)
- Gentle breeze (33 km/h wind)
- Sunrise at 6:33 AM, sunset at 8:00 PM
4 / 6
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Friday, April 17

- High of 12 掳C, low of 8 掳C (77% humidity)
- Overcast with a 0% chance of snow
- Light breeze (15 km/h wind)
- Sunrise at 6:31 AM, sunset at 8:01 PM
- New moon
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Saturday, April 18

- High of 18 掳C, low of 9 掳C (75% humidity)
- Overcast with a 100% chance of rain (10 mm of rain)
- Gentle breeze (36 km/h wind)
- Sunrise at 6:29 AM, sunset at 8:02 PM
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Stepan Bessmelnitsin // Shutterstock

Sunday, April 19

- High of 10 掳C, low of 0 掳C (59% humidity)
- Partly cloudy with a 100% chance of rain (5 mm of rain)
- Gentle breeze (41 km/h wind)
- Sunrise at 6:28 AM, sunset at 8:03 PM

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