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Brockville Weather in September
September in Brockville brings pleasant temperatures, with daytime highs of 22°C (72°F) and nights around 12°C (54°F). Quite a bit of rainfall is expected, around 85 mm (3.3 in), so pack an umbrella.
Rainfall in Brockville in September
Records from the past 30 years suggest around 12 days of rain, with 85 mm (3.3 in) average for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Brockville in September
September in Brockville is generally excellent, with days reaching 22°C (72°F) and nights settling around 12°C (54°F). The difference between afternoon and evening temperatures is usually noticeable. Nights cool down to 12°C (54°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Brockville in September
The area enjoys a balanced 165 hours of sunlight, ensuring it's neither too overcast nor too sunny.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Brockville.
Brockville Temperature in September
Min Temperature
12°C (54°F)
Max Temperature
22°C (72°F)
Chance of Rain
39%
Precipitation
85 mm (3.3 in)
Rainy days
12 days
Sunshine
165 hours *
Percentage Sunshine
44% *
* Data from: Kingston, Canada (74 KM, 46 Miles).
Brockville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Brockville - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Brockville typically drop from around 23°C (73°F) at the start of September to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Brockville in September
Browse day-by-day weather records for Brockville spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Brockville historical weather extremes in September
Our historical data for Brockville spans 1976 to 2026, revealing these weather extremes.
- Brockville recorded its highest September temperature of 33°C (91°F) on September 4, 1999.
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Brockville in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Brockville in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Brockville 3-Day Forecast
More climate data for Brockville
See the full Brockville climate overview or explore weather in Canada.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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Canada in September: Where Is the Best Weather?
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