Brockville, ON:

• Sun 23 Aug: Showers ending this morning then cloudy with 40 percent chance of showers, High 23C, Low 15C
• Mon 24 Aug: Cloudy with 40 percent chance of showers, High 20C, Low 14C
• Tue 25 Aug: Cloudy with 30 percent chance of showers, High 22C, Low 13C

Source: https://weather.gc.ca/

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Forecast:

Sunday, showers ending in the morning give way to cloudy skies with a 40 percent chance of showers through the morning and early afternoon, then a few showers develop in the afternoon with a risk of a thunderstorm. Local rainfall around 10 mm, high of 23, humidex 28, UV index 5 or moderate. Tonight, a few showers wrap up late evening then cloudy skies continue with a 40 percent chance of showers and a risk of a thunderstorm in the evening, local rainfall around 5 mm, low of 15.

Monday is cloudy with a 40 percent chance of showers and a risk of a thunderstorm late in the afternoon, high of 20, UV index 3 or moderate. Monday night stays cloudy with a 40 percent chance of showers, low of 14.

Tuesday brings cloudy skies with a 30 percent chance of showers, high of 22. Tuesday night clears up, low of 13.

Wednesday is sunny with a high of 26. Wednesday night sees cloudy periods with a 30 percent chance of showers, low of 15.

Thursday is cloudy with a 30 percent chance of showers, high of 25. Thursday night stays cloudy with a 30 percent chance of showers, low of 17.

Friday is cloudy with a 30 percent chance of showers, high of 24. Friday night brings cloudy periods with a 30 percent chance of showers, low of 14.

Saturday rounds things out with a mix of sun and cloud, high of 25.