St. Catharines 7-day weather forecast

Written by:
March 9, 2026
ESOlex // Shutterstock

St. Catharines 7-day weather forecast

Stacker created the forecast for St. Catharines, Ontario using data from OpenWeather. This week's high is 15 °C on Monday, while the low is -8 °C on Tuesday. There are expected to be 0 sunny days and rain on 5 days this week.

Environment Canada has issued a weather until Monday at 01:18 PM.

Monday, March 16

- High of 15 °C, low of -1 °C (77% humidity)
- Overcast with a 100% chance of rain (1 mm of rain)
- Moderate breeze (51 km/h wind)
- Sunrise at 7:27 AM, sunset at 7:23 PM
1 / 6
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Tuesday, March 17

- High of -4 °C, low of -8 °C (49% humidity)
- Overcast with a 0% chance of snow
- Moderate risk of harm from sun exposure (2 UV index)
- Moderate breeze (52 km/h wind)
- Sunrise at 7:25 AM, sunset at 7:25 PM
2 / 6
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Wednesday, March 18

- High of 0 °C, low of -6 °C (45% humidity)
- Overcast with a 0% chance of snow
- Moderate risk of harm from sun exposure (4 UV index)
- Light breeze (22 km/h wind)
- Sunrise at 7:23 AM, sunset at 7:26 PM
- New moon
3 / 6
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Thursday, March 19

- High of 4 °C, low of -1 °C (86% humidity)
- Overcast with a 88% chance of rain (0 mm of rain)
- Light breeze (18 km/h wind)
- Sunrise at 7:22 AM, sunset at 7:27 PM
4 / 6
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Friday, March 20

- High of 3 °C, low of 1 °C (98% humidity)
- Overcast with a 100% chance of rain (7 mm of rain)
- Light breeze (22 km/h wind)
- Sunrise at 7:20 AM, sunset at 7:28 PM
5 / 6
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Saturday, March 21

- High of 5 °C, low of -2 °C (58% humidity)
- Overcast with a 28% chance of rain (1 mm of rain)
- Light breeze (24 km/h wind)
- Sunrise at 7:18 AM, sunset at 7:29 PM
6 / 6
Onishchenko Natalya // Shutterstock

Sunday, March 22

- High of 7 °C, low of 0 °C (62% humidity)
- Overcast with a 27% chance of rain (0 mm of rain)
- Gentle breeze (41 km/h wind)
- Sunrise at 7:16 AM, sunset at 7:30 PM

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