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Canada weather

Weather in Chilliwack for September 2025

Your guide to Chilliwack weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Air Quality Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Chilliwack has been nearly identical to the historical average, with a temperature of 22.1 °C (showing only a slight deviation of -0.4 °C).

  • Expect cooler weather in the next days in Chilliwack with the forecast suggesting a temperature of 18.9 °C, lower than the historical average.

  • In general, the average temperature in Chilliwack at the beginning of September is 24.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °C by the end of September.

    • Rain 🌧️

  • The climate of Chilliwack in September is notably wet, with an average of 13 rainy days, and a total of 123.7 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
19°/9°
Temperatures
Average wind speed
7 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Chilliwack Weather September

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

Temperatures trend during September in Chilliwack

See the weather trend as well as the moving average line

September weather in Chilliwack day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 25° /12° 0 mm 6
2 Sept. Cloudy
Cloudy
 26° /13° 0.1 mm 6
3 Sept. Light drizzle
Light drizzle
 23° /14° 0.5 mm 6
4 Sept. Sunny
Sunny
 25° /14° 0.4 mm 6
5 Sept. Sunny
Sunny
 26° /14° 0 mm 7
6 Sept. Sunny
Sunny
 24° /12° 0 mm 6
7 Sept. Sunny
Sunny
 22° /11° 8.8 mm 6
8 Sept. Mist
Mist
 22° /11° 0 mm 5
9 Sept. Partly cloudy
Partly cloudy
 22° /10° 0 mm 5
10 Sept. Partly cloudy
Partly cloudy
 21° /10° 0 mm 5
11 Sept. Fog
Fog
 17° /8° 0.4 mm 4
12 Sept. Mist
Mist
 17° /8° 0.6 mm 4
13 Sept. Fog
Fog
 16° /7° 1.1 mm 4
14 Sept. Overcast
Overcast
 18° /13° 0 mm 0.3
15 Sept. Partly cloudy
Partly cloudy
 19° /7° 0 mm 1
16 Sept. Sunny
Sunny
 26° /11° 0 mm 1.2
17 Sept. Sunny
Sunny
 28° /12° 0 mm 1.1
18 Sept. Sunny
Sunny
 25° /12° 0 mm 0
19 Sept. Sunny
Sunny
 29° /12° 0 mm 5
20 Sept. Sunny
Sunny
 20° /9° 0 mm 4
21 Sept. Moderate rain
Moderate rain
 16° /8° 8.1 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 2.6 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 17° /11° 2.1 mm 3
24 Sept. Moderate rain
Moderate rain
 13° /10° 17.1 mm 3
25 Sept. Moderate rain
Moderate rain
 13° /6° 9.6 mm 2
26 Sept. Patchy rain possible
Patchy rain possible
 13° /6° 1.5 mm 2
27 Sept. Patchy rain possible
Patchy rain possible
 11° /8° 4.9 mm 2
28 Sept. Light rain shower
Light rain shower
 14° /7° 6.6 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
 14° /6° 0 mm 4
30 Sept. Sunny
Sunny
 17° /5° 0 mm 5
Next
Important Notice
Our weather forecast for Chilliwack 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 Chilliwack forecast closer to your planned date for the most up-to-date weather information.
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Chilliwack in September - FAQ

What are the expected maximum and minimum temperatures in Chilliwack during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chilliwack during September?
Significant rainfall exceeding 123.7 mm is expected in Chilliwack during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Chilliwack during September?
The average wind speed in Chilliwack during September is 7 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Chilliwack

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

UV exposure in Chilliwack during September

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

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Location coordinates Where is Chilliwack?

Get accurate weather forecasts for Chilliwack, located at latitude 49.166 and longitude -121.953. Stay updated with localized weather information tailored for Chilliwack.

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