Ottawa 7-day weather forecast

Written by:
August 11, 2025
ESOlex // Shutterstock

Ottawa 7-day weather forecast

Stacker created the forecast for Ottawa, Ontario using data from OpenWeather. This week's high is 37 °C on Tuesday, while the low is 12 °C on Friday. There are expected to be 4 sunny days and rain on 3 days this week.

Environment Canada has issued a heat until Monday at 07:39 AM and a heat until Monday at 07:47 AM.

Monday, August 11

- High of 34 °C, low of 22 °C (32% humidity)
- Fair with a 0% chance of rain
- Very high risk of harm from sun exposure (7 UV index)
- Light breeze (23 km/h wind)
- Sunrise at 5:59 AM, sunset at 8:16 PM
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Tuesday, August 12

- High of 37 °C, low of 18 °C (30% humidity)
- Mostly cloudy with a 61% chance of rain (0 mm of rain)
- Very high risk of harm from sun exposure (7 UV index)
- Gentle breeze (27 km/h wind)
- Sunrise at 6:00 AM, sunset at 8:15 PM
2 / 6
Marian Weyo // Shutterstock

Wednesday, August 13

- High of 31 °C, low of 19 °C (59% humidity)
- Overcast with a 100% chance of rain (4 mm of rain)
- High risk of harm from sun exposure (7 UV index)
- Light breeze (23 km/h wind)
- Sunrise at 6:01 AM, sunset at 8:13 PM
3 / 6
Leonid Ikan // Shutterstock

Thursday, August 14

- High of 26 °C, low of 15 °C (26% humidity)
- Sunny with a 0% chance of snow
- Very high risk of harm from sun exposure (7 UV index)
- Light breeze (16 km/h wind)
- Sunrise at 6:02 AM, sunset at 8:12 PM
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Piyawat Nandeenopparit // Shutterstock

Friday, August 15

- High of 30 °C, low of 12 °C (23% humidity)
- Fair with a 0% chance of snow
- Light air (11 km/h wind)
- Sunrise at 6:03 AM, sunset at 8:10 PM
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VOJTa Herout // Shutterstock

Saturday, August 16

- High of 35 °C, low of 17 °C (25% humidity)
- Mostly cloudy with a 0% chance of rain
- Light breeze (23 km/h wind)
- Sunrise at 6:05 AM, sunset at 8:09 PM
- Last quarter moon
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LeManna // Shutterstock

Sunday, August 17

- High of 31 °C, low of 14 °C (34% humidity)
- Mostly sunny with a 47% chance of rain (1 mm of rain)
- Gentle breeze (29 km/h wind)
- Sunrise at 6:06 AM, sunset at 8:07 PM

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