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5 Day Forecast - Ottawa,ON

Sun 17 May

high: 21°C
Mainly sunny

Mon 18 May

high: 28°C
Sunny

Tue 19 May

high: 29°C
Chance of showers
pop: 30%

Wed 20 May

high: 24°C
A mix of sun and cloud

Thu 21 May

high: 18°C
Sunny

Text Forecast Forecast issued 5:00 AM EDT Saturday 16 May 2026

Saturday: Sunny. Increasing cloudiness near noon then 30 percent chance of showers this afternoon. Wind becoming southwest 20 km/h gusting to 40 this morning. High 21. UV index 8 or very high.

Saturday night: Mainly cloudy with 30 percent chance of showers early this evening. Clearing late this evening. Wind southwest 20 km/h gusting to 40 becoming light early this evening. Low 11.

Sunday: Mainly sunny. Wind northwest 20 km/h gusting to 40 becoming light in the afternoon. High 21. UV index 7 or high.

Sunday night: Clear. Low 10.

Monday: Sunny. High 28.

Monday night: Cloudy periods with 30 percent chance of showers. Low 16.

Tuesday: A mix of sun and cloud with 30 percent chance of showers. High 29.

Tuesday night: Cloudy with 40 percent chance of showers. Low 14.

Wednesday: A mix of sun and cloud. High 24.

Wednesday night: Cloudy periods. Low 7.

Thursday: Sunny. High 18.

Thursday night: Clear. Low 6.

Friday: Sunny. High 20.