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Canada weather

Weather in Oshawa for September 2025

Your guide to Oshawa weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Oshawa is cooler than usual, with temperatures averaging 20.3 °C, this is -2.2 °C below the typical seasonal average.

  • Expect cooler weather in the next days in Oshawa with the forecast suggesting a temperature of 20.9 °C, lower than the historical average.

  • In general, the average temperature in Oshawa at the beginning of September is 23.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.4 °C by the end of September.

    • Rain 🌧️

  • Oshawa experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 68.3 mm.

    • More

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

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/14°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Oshawa Weather September

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

Temperatures trend during September in Oshawa

See the weather trend as well as the moving average line

September weather in Oshawa day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 22° /13° 0.2 mm 6
2 Sept. Mist
Mist
 22° /14° 0.4 mm 5
3 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 25° /14° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 25° /16° 12.7 mm 6
5 Sept. Sunny
Sunny
 26° /16° 0 mm 6
6 Sept. Overcast
Overcast
 23° /16° 1 mm 5
7 Sept. Light rain shower
Light rain shower
 19° /12° 5.3 mm 4
8 Sept. Overcast
Overcast
 21° /10° 0 mm 5
9 Sept. Overcast
Overcast
 21° /12° 2.5 mm 5
10 Sept. Overcast
Overcast
 21° /12° 0 mm 5
11 Sept. Overcast
Overcast
 22° /15° 0.1 mm 5
12 Sept. Moderate rain
Moderate rain
 23° /14° 1.7 mm 5
13 Sept. Overcast
Overcast
 20° /14° 0 mm 5
14 Sept. Mist
Mist
 26° /13° 0 mm 1
15 Sept. Partly cloudy
Partly cloudy
 22° /15° 0 mm 1.3
16 Sept. Sunny
Sunny
 25° /12° 0 mm 1.3
17 Sept. Mist
Mist
 24° /13° 0 mm 1.3
18 Sept. Sunny
Sunny
 27° /16° 0 mm 0
19 Sept. Sunny
Sunny
 20° /12° 0 mm 5
20 Sept. Sunny
Sunny
 17° /8° 0 mm 4
21 Sept. Sunny
Sunny
 21° /10° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 21° /14° 0.3 mm 4
23 Sept. Moderate rain
Moderate rain
 18° /16° 16.8 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 20° /16° 2.9 mm 4
25 Sept. Moderate rain
Moderate rain
 21° /13° 5.9 mm 4
26 Sept. Sunny
Sunny
 15° /7° 0 mm 4
27 Sept. Sunny
Sunny
 15° /5° 0 mm 3
28 Sept. Overcast
Overcast
 19° /13° 0.1 mm 4
29 Sept. Fog
Fog
 19° /15° 0 mm 4
30 Sept. Overcast
Overcast
 20° /14° 0 mm 5
Next
Important Notice
Our weather forecast for Oshawa 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 Oshawa forecast closer to your planned date for the most up-to-date weather information.
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Oshawa in September - FAQ

What are the expected maximum and minimum temperatures in Oshawa during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Oshawa during September?
Moderate rainfall is anticipated in Oshawa during September, with a total of 68.3 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Oshawa during September?
The average wind speed in Oshawa during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Oshawa

Explore the daily rainfall trends and prepare for Oshawas September weather 💧

UV exposure in Oshawa during September

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

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Get accurate weather forecasts for Oshawa, located at latitude 43.9 and longitude -78.85. Stay updated with localized weather information tailored for Oshawa.

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