Chilliwack
September
Weather in Chilliwack for September 2025
Your guide to Chilliwack weather in September - trends and predictions
In general, the average temperature in Chilliwack at the beginning of September is 23.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.1 °C by the end of September.
The climate of Chilliwack in September is notably wet, with an average of 13 rainy days.
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17
Dry days
13
Rainy days
0
Snow days
20°/8°
Temperatures
8 km/h
Avg max wind
73 %
Avg humidity
Chilliwack in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  26° | 3  19° | 4  22° | 5  23° | 6 23° | 7 25° |
| 8 25° | 9  23° | 10 21° | 11 17° | 12 18° | 13 16° | 14 21° |
| 15 23° | 16  23° | 17 18° | 18 16° | 19 14° | 20 17° | 21 21° |
| 22 18° | 23 16° | 24 19° | 25  15° | 26 13° | 27 14° | 28 14° |
| 29 14° | 30 17° |
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Temperatures trend during September in Chilliwack
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 | 29° /11° | 0 mm | 8 | |
| 2 Sept. | Cloudy | 26° /12° | 0.1 mm | 6 | |
| 3 Sept. | Light drizzle | 19° /11° | 0.8 mm | 5 | |
| 4 Sept. | Fog | 22° /11° | 0.6 mm | 6 | |
| 5 Sept. | Patchy rain possible | 23° /11° | 0.1 mm | 6 | |
| 6 Sept. | Sunny | 23° /10° | 0 mm | 6 | |
| 7 Sept. | Sunny | 25° /10° | 0 mm | 7 | |
| 8 Sept. | Mist | 25° /9° | 0 mm | 6 | |
| 9 Sept. | Partly cloudy | 23° /8° | 0.1 mm | 6 | |
| 10 Sept. | Partly cloudy | 21° /8° | 0 mm | 5 | |
| 11 Sept. | Light drizzle | 17° /7° | 0.6 mm | 4 | |
| 12 Sept. | Light rain | 18° /7° | 0.9 mm | 4 | |
| 13 Sept. | Fog | 16° /7° | 1.6 mm | 4 | |
| 14 Sept. | Sunny | 21° /7° | 4.2 mm | 5 | |
| 15 Sept. | Sunny | 23° /8° | 0 mm | 6 | |
| 16 Sept. | Overcast | 23° /9° | 0 mm | 6 | |
| 17 Sept. | Overcast | 18° /7° | 0 mm | 5 | |
| 18 Sept. | Light drizzle | 16° /10° | 1 mm | 4 | |
| 19 Sept. | Overcast | 14° /9° | 1.8 mm | 4 | |
| 20 Sept. | Patchy rain possible | 17° /8° | 1 mm | 4 | |
| 21 Sept. | Sunny | 21° /8° | 0 mm | 5 | |
| 22 Sept. | Sunny | 18° /6° | 6 mm | 5 | |
| 23 Sept. | Light rain shower | 16° /7° | 7.4 mm | 4 | |
| 24 Sept. | Patchy rain possible | 19° /8° | 2.8 mm | 5 | |
| 25 Sept. | Moderate or heavy rain with thunder | 15° /10° | 46.3 mm | 4 | |
| 26 Sept. | Light rain shower | 13° /7° | 25.3 mm | 3 | |
| 27 Sept. | Light rain | 14° /8° | 16.6 mm | 4 | |
| 28 Sept. | Light rain shower | 14° /7° | 6.6 mm | 4 | |
| 29 Sept. | Patchy rain possible | 14° /6° | 0 mm | 4 | |
| 30 Sept. | Sunny | 17° /5° | 0 mm | 5 | |
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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.
Chilliwack in September - FAQ
What are the expected maximum and minimum temperatures in Chilliwack during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Chilliwack during September?
Moderate rainfall is anticipated in Chilliwack during September, with a total of 87.6 mm spread over approximately 13 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Chilliwack during September?
The average wind speed in Chilliwack during September is 8 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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