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Weather in Orillia for September 2025

Your guide to Orillia weather in September - trends and predictions

    Temperatures

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

  • The forecast for the next days in Orillia predicts temperatures to be around 21 °C, close to the historical average.

  • In general, the average temperature in Orillia at the beginning of September is 22.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °C by the end of September.

    • Rain 🌧️

  • Orillia experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 104.8 mm.

    • More

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

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Orillia Weather September

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

Temperatures trend during September in Orillia

See the weather trend as well as the moving average line

September weather in Orillia day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Overcast
Overcast
 23° /9° 0 mm 5
2 Sept. Patchy rain possible
Patchy rain possible
 22° /11° 0.2 mm 5
3 Sept. Partly cloudy
Partly cloudy
 26° /14° 0.4 mm 6
4 Sept. Patchy rain possible
Patchy rain possible
 24° /14° 27.9 mm 6
5 Sept. Sunny
Sunny
 26° /14° 0 mm 7
6 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 22° /15° 8.5 mm 5
7 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /11° 11.3 mm 4
8 Sept. Overcast
Overcast
 19° /9° 0.3 mm 4
9 Sept. Cloudy
Cloudy
 22° /9° 2.7 mm 5
10 Sept. Mist
Mist
 22° /11° 0 mm 5
11 Sept. Light rain shower
Light rain shower
 23° /12° 0.9 mm 5
12 Sept. Heavy rain
Heavy rain
 23° /13° 9 mm 5
13 Sept. Overcast
Overcast
 22° /13° 0 mm 5
14 Sept. Cloudy
Cloudy
 24° /13° 0 mm 1.1
15 Sept. Cloudy
Cloudy
 21° /14° 0 mm 1.3
16 Sept. Sunny
Sunny
 23° /9° 0 mm 1.3
17 Sept. Partly cloudy
Partly cloudy
 26° /13° 0 mm 1.3
18 Sept. Sunny
Sunny
 27° /15° 0 mm 0
19 Sept. Sunny
Sunny
 19° /9° 0 mm 4
20 Sept. Sunny
Sunny
 20° /6° 0 mm 4
21 Sept. Sunny
Sunny
 23° /8° 0 mm 5
22 Sept. Partly cloudy
Partly cloudy
 25° /14° 0 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 19° /16° 4.2 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 22° /16° 1.8 mm 4
25 Sept. Moderate rain
Moderate rain
 21° /11° 5.6 mm 4
26 Sept. Sunny
Sunny
 14° /4° 0 mm 3
27 Sept. Sunny
Sunny
 15° /4° 0 mm 3
28 Sept. Overcast
Overcast
 20° /10° 0 mm 5
29 Sept. Overcast
Overcast
 21° /13° 0 mm 5
30 Sept. Mist
Mist
 19° /12° 0 mm 4
Next
Important Notice
Our weather forecast for Orillia 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 Orillia forecast closer to your planned date for the most up-to-date weather information.
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Orillia in September - FAQ

What are the expected maximum and minimum temperatures in Orillia during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Orillia during September?
Significant rainfall exceeding 104.8 mm is expected in Orillia during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Orillia during September?
The average wind speed in Orillia during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Orillia

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

UV exposure in Orillia during September

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

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Location coordinates Where is Orillia?

Get accurate weather forecasts for Orillia, located at latitude 44.609 and longitude -79.421. Stay updated with localized weather information tailored for Orillia.

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