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Weather in Fort St. John for September 2026

Your guide to Fort St. John weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Fort St. John is cooler than usual, with temperatures averaging 19 °C, this is 2.3 °C below the typical seasonal average.

  • The forecast for the next days in Fort St. John predicts a temperature of 14.9 °C, which is cooler than the historical average.

  • 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 12.4 °C by the end of September.

    • Rain 🌧️

  • Fort St. John experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 25.1 mm.

    • More

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

Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/7°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
60 %
Avg humidity

Fort St. John Weather September

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

Temperatures trend during September in Fort St. John

See the weather trend as well as the moving average line

September weather in Fort St. John day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 25° /11° 0 mm 5
2 Sept. Sunny
Sunny
 23° /11° 2.1 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 19° /8° 0.9 mm 4
4 Sept. Mist
Mist
 18° /6° 0 mm 4
5 Sept. Sunny
Sunny
 21° /5° 0.1 mm 5
6 Sept. Sunny
Sunny
 23° /8° 0 mm 5
7 Sept. Sunny
Sunny
 23° /9° 0 mm 5
8 Sept. Sunny
Sunny
 22° /9° 0.3 mm 5
9 Sept. Sunny
Sunny
 18° /8° 2 mm 4
10 Sept. Partly cloudy
Partly cloudy
 19° /6° 2.5 mm 5
11 Sept. Overcast
Overcast
 11° /3° 0.2 mm 2.3
12 Sept. Sunny
Sunny
 15° /4° 0 mm 3.9
13 Sept. Overcast
Overcast
 17° /6° 0 mm 3.2
14 Sept. Patchy rain possible
Patchy rain possible
 14° /3° 4 mm 3.2
15 Sept. Sunny
Sunny
 15° /4° 2 mm 3
16 Sept. Sunny
Sunny
 20° /9° 0 mm 5
17 Sept. Sunny
Sunny
 18° /12° 0 mm 5
18 Sept. Sunny
Sunny
 21° /9° 0 mm 6
19 Sept. Partly cloudy
Partly cloudy
 21° /12° 0 mm 6
20 Sept. Sunny
Sunny
 17° /9° 0 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 12° /5° 1.2 mm 3
22 Sept. Light rain shower
Light rain shower
 7° /0° 4.3 mm 1
23 Sept. Overcast
Overcast
 8° /-1° 0 mm 3
24 Sept. Sunny
Sunny
 12° /3° 0 mm 4
25 Sept. Mist
Mist
 15° /4° 1.4 mm 4
26 Sept. Mist
Mist
 14° /4° 1.7 mm 3
27 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 12° /5° 2.3 mm 3
28 Sept. Light rain
Light rain
 12° /2° 2.5 mm 3
29 Sept. Light drizzle
Light drizzle
 10° /4° 7.1 mm 2
30 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 12° /3° 0.4 mm 3
Next
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.
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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 18° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Fort St. John during September?
In September, Fort St. John can expect light to moderate rainfall, totaling 25.1 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.

What are the typical wind conditions in Fort St. John during September?
The average wind speed in Fort St. John during September is 19 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 💧
Typically, Fort St. John has 9 rainy days in September with a total of 25.1 mm of rainfall.

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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