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St. Catharines 7-day weather forecast
Stacker created the forecast for St. Catharines, Ontario using data from OpenWeather. This week's high is 33 °C on Monday, while the low is 16 °C on Saturday. There are expected to be 4 sunny days and rain on 1 day this week.
Environment Canada has issued a heat until Monday at 08:04 AM.
Monday, July 28
- High of 33 °C, low of 21 °C (48% humidity)- Sunny with a 0% chance of rain
- Very high risk of harm from sun exposure (8 UV index)
- Light breeze (21 km/h wind)
- Sunrise at 6:03 AM, sunset at 8:43 PM

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Tuesday, July 29
- High of 28 °C, low of 21 °C (56% humidity)
- Partly cloudy with a 100% chance of rain (5 mm of rain)
- Very high risk of harm from sun exposure (9 UV index)
- Light breeze (19 km/h wind)
- Sunrise at 6:04 AM, sunset at 8:42 PM
- Partly cloudy with a 100% chance of rain (5 mm of rain)
- Very high risk of harm from sun exposure (9 UV index)
- Light breeze (19 km/h wind)
- Sunrise at 6:04 AM, sunset at 8:42 PM

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IKO-studio // Shutterstock
Wednesday, July 30
- High of 30 °C, low of 21 °C (54% humidity)
- Partly sunny with a 0% chance of snow
- Very high risk of harm from sun exposure (8 UV index)
- Gentle breeze (30 km/h wind)
- Sunrise at 6:05 AM, sunset at 8:41 PM
- Partly sunny with a 0% chance of snow
- Very high risk of harm from sun exposure (8 UV index)
- Gentle breeze (30 km/h wind)
- Sunrise at 6:05 AM, sunset at 8:41 PM

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Gary Whitton // Shutterstock
Thursday, July 31
- High of 24 °C, low of 19 °C (40% humidity)
- Mostly cloudy with a 0% chance of snow
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (30 km/h wind)
- Sunrise at 6:06 AM, sunset at 8:40 PM
- Mostly cloudy with a 0% chance of snow
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (30 km/h wind)
- Sunrise at 6:06 AM, sunset at 8:40 PM

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Marian Weyo // Shutterstock
Friday, August 1
- High of 24 °C, low of 17 °C (49% humidity)
- Mostly sunny with a 0% chance of snow
- Light breeze (21 km/h wind)
- Sunrise at 6:07 AM, sunset at 8:38 PM
- First quarter moon
- Mostly sunny with a 0% chance of snow
- Light breeze (21 km/h wind)
- Sunrise at 6:07 AM, sunset at 8:38 PM
- First quarter moon

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supergenijalac // Shutterstock
Saturday, August 2
- High of 25 °C, low of 16 °C (44% humidity)
- Sunny with a 0% chance of snow
- Light breeze (17 km/h wind)
- Sunrise at 6:08 AM, sunset at 8:37 PM
- Sunny with a 0% chance of snow
- Light breeze (17 km/h wind)
- Sunrise at 6:08 AM, sunset at 8:37 PM

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Onishchenko Natalya // Shutterstock
Sunday, August 3
- High of 26 °C, low of 17 °C (37% humidity)
- Sunny with a 0% chance of snow
- Light air (10 km/h wind)
- Sunrise at 6:09 AM, sunset at 8:36 PM
- Sunny with a 0% chance of snow
- Light air (10 km/h wind)
- Sunrise at 6:09 AM, sunset at 8:36 PM