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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Brockville's climate page.
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% *
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 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 2025, 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 →
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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 monthWhat To Do in Brockville in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Canada, check out our Brockville's climate page.
See the full Brockville climate overview or explore weather in Canada.
