weathercrisp.com
Sarnia
AbbotsfordAjaxAuroraBanffBarrieBoisbriandBouchervilleBramptonBrandonBrantfordBrossardBurlingtonBurnabyCalgaryCambridgeCharlottetownChathamChilliwackCoquitlamCornwallDartmouthDeltaDorvalEdmontonFort McMurrayFrederictonGatineauGranbyGrande PrairieGreater SudburyGuelphHalifaxHamiltonKamloopsKanataKelownaKingstonKitchenerLangleyLavalLethbridgeLindsayLondonMarkhamMiltonMissionMississaugaMonctonMont-RoyalMontréalMoose JawNanaimoNepeanNew GlasgowNewmarketNiagara FallsNorfolk CountyNorth BattlefordNorth BayOakvilleOkanaganOrilliaOshawaOttawaPentictonPeterboroughPickeringPointe-ClairePrince AlbertPrince EdwardPrince GeorgeQuébecRed DeerReginaRichmond HillSaguenaySaint John
Sarnia
SaskatoonSault Ste. MarieSherbrookeSt. CatharinesSt. John'sSurreySydneyThunder BayTimminsTorontoVancouverVaughanVictoriaWasaga BeachWaterlooWellandWest VancouverWhistlerWhitehorseWindsorWinnipegWoodstockYellowknife More Locations
Canada weather

Weather in Sarnia for September 2026

Your guide to Sarnia weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Sarnia at the beginning of September is 23.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.1 °C by the end of September.

    • Rain 🌧️

  • Sarnia experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 75 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
22°/13°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Sarnia Weather September

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

Temperatures trend during September in Sarnia

See the weather trend as well as the moving average line

September weather in Sarnia day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 23° /12° 0 mm 6
2 Sept. Overcast
Overcast
 22° /10° 0 mm 5
3 Sept. Cloudy
Cloudy
 27° /13° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 26° /14° 16.4 mm 6
5 Sept. Mist
Mist
 27° /14° 0 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 23° /13° 4.6 mm 5
7 Sept. Light rain shower
Light rain shower
 19° /12° 2.9 mm 4
8 Sept. Patchy rain possible
Patchy rain possible
 20° /10° 0 mm 5
9 Sept. Partly cloudy
Partly cloudy
 23° /11° 0 mm 6
10 Sept. Overcast
Overcast
 23° /13° 0 mm 5
11 Sept. Partly cloudy
Partly cloudy
 24° /14° 0.3 mm 6
12 Sept. Torrential rain shower
Torrential rain shower
 24° /14° 9.1 mm 5
13 Sept. Overcast
Overcast
 23° /12° 0 mm 6
14 Sept. Partly cloudy
Partly cloudy
 23° /12° 0 mm 6
15 Sept. Mist
Mist
 24° /13° 0 mm 6
16 Sept. Mist
Mist
 24° /12° 0 mm 6
17 Sept. Patchy rain possible
Patchy rain possible
 23° /12° 0.3 mm 5
18 Sept. Fog
Fog
 21° /12° 0.4 mm 5
19 Sept. Fog
Fog
 20° /12° 0 mm 4
20 Sept. Patchy rain possible
Patchy rain possible
 24° /12° 0 mm 5
21 Sept. Mist
Mist
 25° /15° 15.1 mm 6
22 Sept. Fog
Fog
 26° /16° 11.1 mm 6
23 Sept. Fog
Fog
 21° /14° 8.3 mm 5
24 Sept. Overcast
Overcast
 21° /15° 5.2 mm 5
25 Sept. Partly cloudy
Partly cloudy
 21° /15° 0 mm 5
26 Sept. Patchy rain possible
Patchy rain possible
 21° /14° 0.2 mm 5
27 Sept. Overcast
Overcast
 22° /14° 0 mm 5
28 Sept. Overcast
Overcast
 20° /14° 0.9 mm 4
29 Sept. Mist
Mist
 21° /14° 0.1 mm 5
30 Sept. Overcast
Overcast
 22° /13° 0 mm 5
Next
Important Notice
Our weather forecast for Sarnia 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 Sarnia forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Sarnia in September - FAQ

What are the expected maximum and minimum temperatures in Sarnia during September?

Enjoy moderate daytime temperatures of up to 22° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Sarnia during September?

Moderate rainfall is anticipated in Sarnia during September, with a total of 75 mm spread over approximately 9 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Sarnia during September?

The average wind speed in Sarnia during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Sarnia

Explore the daily rainfall trends and prepare for Sarnias September weather 💧
Typically, Sarnia has 9 rainy days in September with a total of 75 mm of rainfall.

UV exposure in Sarnia during September

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

Quick links

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

Get accurate weather forecasts for Sarnia, located at latitude 42.979 and longitude -82.404. Stay updated with localized weather information tailored for Sarnia.

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