easeweather.com
Brockville
AbbotsfordAjaxAuroraBanffBarrieBoisbriandBouchervilleBramptonBrandonBrantford
Brockville
BrossardBurlingtonBurnabyCalgaryCambridgeCharlottetownChathamChilliwackCoquitlamCornwallDartmouthDeltaDorvalEdmontonFort McMurrayFrederictonGatineauGranbyGrande PrairieGreater SudburyGuelphHalifaxHamiltonKamloopsKanataKelownaKingstonKitchenerLangleyLavalLethbridgeLindsayLondonMarkhamMiltonMissionMississaugaMonctonMont-RoyalMontréalMoose JawNanaimoNepeanNew GlasgowNewmarketNiagara FallsNorfolk CountyNorth BattlefordNorth BayOakvilleOkanaganOrilliaOshawaOttawaPentictonPeterboroughPickeringPointe-ClairePrince AlbertPrince EdwardPrince GeorgeQuébecRed DeerReginaRichmond HillSaguenaySaint JohnSarniaSaskatoonSault Ste. MarieSherbrookeSt. CatharinesSt. John'sSurreySydneyThunder BayTimminsTorontoVancouverVaughanVictoriaWasaga BeachWaterlooWellandWest VancouverWhistlerWindsorWinnipegWoodstockYellowknife More Locations
Canada weather

Weather in Brockville for September 2026

Your guide to Brockville weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Brockville is slightly cooler than the historical average by 0.6 °C.

  • The forecast for the next days in Brockville predicts a temperature of 18.6 °C, which is cooler than the historical average.

  • In general, the average temperature in Brockville at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.

    • Rain 🌧️

  • Brockville experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 117.4 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/11°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Brockville Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Mist
25°
2
Mist
24°
3
Fog
26°
4
Sunny
26°
5
Sunny
26°
6
Fog
25°
7
Light rain shower
23°
8
Patchy rain possible
20°
9
Cloudy
23°
10
Light rain shower
23°
11
Sunny
23°
12
Overcast
26°
13
Overcast
26°
14
Sunny
17°
15
Overcast
18°
16
Overcast
24°
17
Overcast
16°
18
Overcast
15°
19
Patchy rain possible
10°
20
Sunny
16°
21
Sunny
18°
22
Sunny
20°
23
Patchy rain possible
22°
24
Patchy rain possible
15°
25
Sunny
17°
26
Cloudy
21°
27
Mist
21°
28
Mist
22°
29
Overcast
21°
30
Overcast
23°

Temperatures trend during September in Brockville

See the weather trend as well as the moving average line

September weather in Brockville day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /11° 19.1 mm 5
2 Sept. Mist
Mist
 24° /12° 16.5 mm 5
3 Sept. Fog
Fog
 26° /13° 16.2 mm 5
4 Sept. Sunny
Sunny
 26° /14° 10.2 mm 7
5 Sept. Sunny
Sunny
 26° /12° 0.3 mm 6
6 Sept. Fog
Fog
 25° /14° 3.4 mm 6
7 Sept. Light rain shower
Light rain shower
 23° /11° 3.5 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 20° /11° 0.3 mm 4
9 Sept. Cloudy
Cloudy
 23° /10° 3.9 mm 4
10 Sept. Light rain shower
Light rain shower
 23° /10° 0.8 mm 6
11 Sept. Sunny
Sunny
 23° /10° 0 mm 6
12 Sept. Overcast
Overcast
 26° /10° 0 mm 5.8
13 Sept. Overcast
Overcast
 26° /15° 1.3 mm 4.2
14 Sept. Sunny
Sunny
 17° /9° 0 mm 5.1
15 Sept. Overcast
Overcast
 18° /7° 1.2 mm 4
16 Sept. Overcast
Overcast
 24° /17° 0.2 mm 6
17 Sept. Overcast
Overcast
 16° /10° 0.1 mm 3
18 Sept. Overcast
Overcast
 15° /10° 1.1 mm 3
19 Sept. Patchy rain possible
Patchy rain possible
 10° /8° 43.6 mm 2
20 Sept. Sunny
Sunny
 16° /7° 0 mm 5
21 Sept. Sunny
Sunny
 18° /5° 0 mm 5
22 Sept. Sunny
Sunny
 20° /9° 0 mm 6
23 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0.6 mm 6
24 Sept. Patchy rain possible
Patchy rain possible
 15° /6° 0.6 mm 4
25 Sept. Sunny
Sunny
 17° /3° 0 mm 4
26 Sept. Cloudy
Cloudy
 21° /12° 16.1 mm 5
27 Sept. Mist
Mist
 21° /7° 0 mm 5
28 Sept. Mist
Mist
 22° /10° 0 mm 5
29 Sept. Overcast
Overcast
 21° /12° 0 mm 5
30 Sept. Overcast
Overcast
 23° /10° 0 mm 5
Next
Important Notice
Our weather forecast for Brockville in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Brockville forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Brockville in September - FAQ

What are the expected maximum and minimum temperatures in Brockville during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Brockville during September?
Significant rainfall exceeding 117.4 mm is expected in Brockville during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Brockville during September?
The average wind speed in Brockville during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Brockville

Explore the daily rainfall trends and prepare for Brockvilles September weather 💧
Typically, Brockville has 9 rainy days in September with a total of 117.4 mm of rainfall.

UV exposure in Brockville during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

More Brockville weather pages
You are here
Location coordinates Where is Brockville?

Get accurate weather forecasts for Brockville, located at latitude 44.591 and longitude -75.687. Stay updated with localized weather information tailored for Brockville.

Found a mistake?
We appreciate your attention to details. Tell us here.