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Weather in Markham for September 2025

Your guide to Markham weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Markham is cooler than usual, with temperatures averaging 21.5 °C, this is -2.3 °C below the typical seasonal average.

  • The forecast for the next days in Markham predicts temperatures to be around 24 °C, close to the historical average.

  • In general, the average temperature in Markham at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.7 °C by the end of September.

    • Rain 🌧️

  • Markham experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 54.9 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Markham Weather September

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

Temperatures trend during September in Markham

See the weather trend as well as the moving average line

September weather in Markham day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 24° /12° 0.1 mm 6
2 Sept. Mist
Mist
 23° /13° 0.3 mm 5
3 Sept. Partly cloudy
Partly cloudy
 28° /14° 0 mm 7
4 Sept. Cloudy
Cloudy
 27° /15° 8 mm 6
5 Sept. Partly cloudy
Partly cloudy
 27° /15° 0 mm 7
6 Sept. Patchy rain possible
Patchy rain possible
 25° /16° 3.1 mm 5
7 Sept. Light rain shower
Light rain shower
 19° /13° 3.4 mm 4
8 Sept. Overcast
Overcast
 21° /9° 0 mm 4
9 Sept. Overcast
Overcast
 22° /10° 1.3 mm 5
10 Sept. Overcast
Overcast
 22° /12° 0 mm 5
11 Sept. Overcast
Overcast
 24° /15° 0.1 mm 5
12 Sept. Fog
Fog
 24° /14° 0.7 mm 6
13 Sept. Overcast
Overcast
 23° /13° 0 mm 5
14 Sept. Partly cloudy
Partly cloudy
 27° /13° 0 mm 1.1
15 Sept. Partly cloudy
Partly cloudy
 23° /15° 0 mm 1.3
16 Sept. Mist
Mist
 24° /11° 0 mm 1.3
17 Sept. Sunny
Sunny
 26° /15° 0 mm 1.3
18 Sept. Sunny
Sunny
 29° /16° 0 mm 0
19 Sept. Partly cloudy
Partly cloudy
 22° /16° 0 mm 5
20 Sept. Partly cloudy
Partly cloudy
 19° /12° 0 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 27° /15° 1.1 mm 4
22 Sept. Patchy rain possible
Patchy rain possible
 19° /12° 0.9 mm 4
23 Sept. Sunny
Sunny
 21° /11° 0 mm 4
24 Sept. Partly cloudy
Partly cloudy
 20° /12° 0 mm 5
25 Sept. Sunny
Sunny
 26° /13° 0 mm 5
26 Sept. Sunny
Sunny
 21° /11° 0 mm 5
27 Sept. Sunny
Sunny
 27° /14° 0 mm 5
28 Sept. Patchy rain possible
Patchy rain possible
 18° /13° 0 mm 4
29 Sept. Mist
Mist
 20° /15° 0 mm 5
30 Sept. Mist
Mist
 20° /14° 0 mm 5
Next
Important Notice
Our weather forecast for Markham 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 Markham forecast closer to your planned date for the most up-to-date weather information.
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Markham in September - FAQ

What are the expected maximum and minimum temperatures in Markham during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Markham during September?
Moderate rainfall is anticipated in Markham during September, with a total of 54.9 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Markham during September?
The average wind speed in Markham during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Markham

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

UV exposure in Markham during September

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

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Location coordinates Where is Markham?

Get accurate weather forecasts for Markham, located at latitude 43.867 and longitude -79.266. Stay updated with localized weather information tailored for Markham.

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