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Weather in Fort St. John for September 2025

Your guide to Fort St. John weather in September - trends and predictions
  • In general, the average temperature in Fort St. John at the beginning of September is 21.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13 °C by the end of September.

  • With an average of 5 rainy days, Fort St. John experiences minimal rainfall in September.

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Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/5°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
58 %
Avg humidity

Fort St. John in September average weather

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Temperatures trend during September in Fort St. John

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
27° /10° 0 mm 7
2 Sept. Sunny
Sunny
22° /9° 2.1 mm 6
3 Sept. Patchy rain possible
Patchy rain possible
17° /6° 1.1 mm 4
4 Sept. Mist
Mist
18° /4° 0 mm 5
5 Sept. Thundery outbreaks possible
Thundery outbreaks possible
23° /6° 0.1 mm 6
6 Sept. Thundery outbreaks possible
Thundery outbreaks possible
22° /9° 0 mm 6
7 Sept. Partly cloudy
Partly cloudy
23° /8° 0 mm 7
8 Sept. Sunny
Sunny
21° /8° 0.5 mm 6
9 Sept. Sunny
Sunny
17° /5° 2.6 mm 5
10 Sept. Sunny
Sunny
22° /5° 0 mm 6
11 Sept. Overcast
Overcast
19° /6° 0.3 mm 5
12 Sept. Overcast
Overcast
21° /7° 0 mm 5
13 Sept. Partly cloudy
Partly cloudy
19° /8° 0 mm 5
14 Sept. Sunny
Sunny
18° /6° 0.9 mm 5
15 Sept. Overcast
Overcast
22° /5° 0 mm 5
16 Sept. Overcast
Overcast
18° /6° 0 mm 5
17 Sept. Partly cloudy
Partly cloudy
18° /7° 4.5 mm 5
18 Sept. Sunny
Sunny
16° /7° 0 mm 5
19 Sept. Overcast
Overcast
12° /4° 0 mm 3
20 Sept. Partly cloudy
Partly cloudy
14° /4° 0 mm 4
21 Sept. Partly cloudy
Partly cloudy
18° /4° 0 mm 5
22 Sept. Cloudy
Cloudy
20° /8° 0 mm 5
23 Sept. Partly cloudy
Partly cloudy
20° /6° 0 mm 5
24 Sept. Light rain
Light rain
15° /8° 2.3 mm 4
25 Sept. Mist
Mist
17° /3° 2 mm 4
26 Sept. Mist
Mist
15° /4° 0.6 mm 4
27 Sept. Thundery outbreaks possible
Thundery outbreaks possible
12° /5° 3.5 mm 3
28 Sept. Light rain
Light rain
12° /3° 3.7 mm 3
29 Sept. Light drizzle
Light drizzle
9° /3° 0.3 mm 2
30 Sept. Thundery outbreaks possible
Thundery outbreaks possible
11° /2° 0.6 mm 3
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Important Notice
Our weather forecast for Fort St. John 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 Fort St. John forecast closer to your planned date for the most up-to-date weather information.

Fort St. John in September - FAQ

What are the expected maximum and minimum temperatures in Fort St. John during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 5°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Fort St. John during September?
Expect minimal rainfall in Fort St. John during September, with a total of 15.5 mm over approximately 5 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Fort St. John during September?
The average wind speed in Fort St. John during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Fort St. John

Explore the daily rainfall trends and prepare for Fort St. Johns September weather 💧

UV exposure in Fort St. John during September

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

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Location coordinates Where is Fort St. John?

Get accurate weather forecasts for Fort St. John, located at latitude 56.25 and longitude -120.853. Stay updated with localized weather information tailored for Fort St. John.

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