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Weather in Granby for September 2026

Your guide to Granby weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in Granby is slightly warmer than the historical average by 0.6 °C.

  • Expect cooler weather in the next days in Granby with the forecast suggesting a temperature of 18.2 °C, lower than the historical average.

  • In general, the average temperature in Granby at the beginning of September is 24.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20 °C by the end of September.

    • Rain 🌧️

  • The climate of Granby in September is notably wet, with an average of 13 rainy days, and a total of 163.1 mm of precipitation.

    • More

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

Average dry days
17
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/11°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Granby Weather September

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

Temperatures trend during September in Granby

See the weather trend as well as the moving average line

September weather in Granby day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /11° 1.7 mm 5
2 Sept. Overcast
Overcast
 22° /12° 10.4 mm 4
3 Sept. Overcast
Overcast
 24° /13° 35.2 mm 5
4 Sept. Sunny
Sunny
 25° /14° 2.4 mm 7
5 Sept. Fog
Fog
 25° /14° 9.9 mm 5
6 Sept. Mist
Mist
 24° /14° 12.9 mm 6
7 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 24° /11° 4.8 mm 5
8 Sept. Light rain shower
Light rain shower
 21° /10° 16.4 mm 4
9 Sept. Sunny
Sunny
 20° /8° 3.9 mm 4
10 Sept. Light rain shower
Light rain shower
 20° /10° 23.9 mm 5
11 Sept. Sunny
Sunny
 18° /9° 0 mm 5.2
12 Sept. Sunny
Sunny
 22° /10° 0 mm 5.3
13 Sept. Light rain shower
Light rain shower
 24° /17° 8.3 mm 4
14 Sept. Sunny
Sunny
 17° /9° 0 mm 4.9
15 Sept. Overcast
Overcast
 18° /7° 0 mm 4
16 Sept. Overcast
Overcast
 19° /16° 1.4 mm 4
17 Sept. Overcast
Overcast
 19° /13° 0.7 mm 4
18 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0.7 mm 5
19 Sept. Sunny
Sunny
 17° /9° 0 mm 5
20 Sept. Sunny
Sunny
 17° /7° 0 mm 5
21 Sept. Sunny
Sunny
 20° /11° 0 mm 6
22 Sept. Overcast
Overcast
 18° /12° 0 mm 5
23 Sept. Patchy rain possible
Patchy rain possible
 12° /9° 7.4 mm 2
24 Sept. Sunny
Sunny
 18° /8° 0.4 mm 5
25 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /11° 19.1 mm 5
26 Sept. Sunny
Sunny
 19° /10° 58.4 mm 5
27 Sept. Fog
Fog
 20° /6° 1 mm 5
28 Sept. Mist
Mist
 22° /12° 0 mm 5
29 Sept. Mist
Mist
 22° /11° 0 mm 5
30 Sept. Sunny
Sunny
 20° /10° 0 mm 5
Next
Important Notice
Our weather forecast for Granby 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 Granby forecast closer to your planned date for the most up-to-date weather information.
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Granby in September - FAQ

What are the expected maximum and minimum temperatures in Granby during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Granby during September?
Significant rainfall exceeding 163.1 mm is expected in Granby during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Granby during September?
The average wind speed in Granby during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Granby

Explore the daily rainfall trends and prepare for Granbys September weather 💧
Typically, Granby has 13 rainy days in September with a total of 163.1 mm of rainfall.

UV exposure in Granby during September

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

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Location coordinates Where is Granby?

Get accurate weather forecasts for Granby, located at latitude 45.4 and longitude -72.732. Stay updated with localized weather information tailored for Granby.

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