Clark County (Vancouver)
September
Weather in Clark County for September 2025
Your guide to Clark County weather in September - trends and predictions
In general, the average temperature in Clark County at the beginning of September is 27.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °F by the end of September.
Clark County sees moderate rainfall in September, averaging 10 rainy days.
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20
Dry days
10
Rainy days
0
Snow days
23°/11°
Temperatures
11 km/h
Avg max wind
66 %
Avg humidity
Clark County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  29° | 2  26° | 3  24° | 4  25° | 5 30° | 6  29° | 7 28° |
| 8 28° | 9 28° | 10  26° | 11 21° | 12 22° | 13 23° | 14 27° |
| 15 28° | 16 27° | 17 20° | 18 21° | 19 20° | 20 20° | 21 24° |
| 22 24° | 23 23° | 24  25° | 25 21° | 26 20° | 27 19° | 28 19° |
| 29 19° | 30 21° |
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Temperatures trend during September in Clark County
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 |
|---|---|---|---|---|---|
| Sept. 1 | Fog | 29° /15° | 0.1 mm | 7 | |
| Sept. 2 | Cloudy | 26° /14° | 0.2 mm | 6 | |
| Sept. 3 | Patchy rain possible | 24° /14° | 1.1 mm | 5 | |
| Sept. 4 | Overcast | 25° /12° | 0.8 mm | 6 | |
| Sept. 5 | Mist | 30° /12° | 0 mm | 7 | |
| Sept. 6 | Partly cloudy | 29° /13° | 0 mm | 7 | |
| Sept. 7 | Cloudy | 28° /14° | 0 mm | 6 | |
| Sept. 8 | Overcast | 28° /13° | 0 mm | 7 | |
| Sept. 9 | Mist | 28° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 26° /12° | 0 mm | 7 | |
| Sept. 11 | Overcast | 21° /12° | 5.2 mm | 5 | |
| Sept. 12 | Cloudy | 22° /11° | 0.3 mm | 5 | |
| Sept. 13 | Overcast | 23° /10° | 0 mm | 6 | |
| Sept. 14 | Sunny | 27° /11° | 0.1 mm | 7 | |
| Sept. 15 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 16 | Sunny | 27° /10° | 0 mm | 7 | |
| Sept. 17 | Overcast | 20° /10° | 10.3 mm | 5 | |
| Sept. 18 | Overcast | 21° /11° | 0 mm | 5 | |
| Sept. 19 | Overcast | 20° /11° | 0 mm | 5 | |
| Sept. 20 | Light rain shower | 20° /10° | 0.6 mm | 5 | |
| Sept. 21 | Partly cloudy | 24° /8° | 0 mm | 7 | |
| Sept. 22 | Sunny | 24° /11° | 0 mm | 7 | |
| Sept. 23 | Light rain shower | 23° /13° | 1.7 mm | 5 | |
| Sept. 24 | Light drizzle | 25° /13° | 2.9 mm | 6 | |
| Sept. 25 | Light rain shower | 21° /14° | 10.6 mm | 5 | |
| Sept. 26 | Light rain shower | 20° /11° | 5.6 mm | 5 | |
| Sept. 27 | Light rain shower | 19° /13° | 7.2 mm | 5 | |
| Sept. 28 | Light rain shower | 19° /11° | 0.8 mm | 5 | |
| Sept. 29 | Overcast | 19° /8° | 0 mm | 4 | |
| Sept. 30 | Sunny | 21° /7° | 0 mm | 6 | |
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Important Notice
Our weather forecast for Clark County 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 Clark County forecast closer to your planned date for the most up-to-date weather information.
Clark County in September - FAQ
What are the expected maximum and minimum temperatures in Clark County during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Clark County during September?
Moderate rainfall is anticipated in Clark County during September, with a total of 58.7 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Clark County during September?
The average wind speed in Clark County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Clark County
Explore the daily rainfall trends and prepare for Clark Countys September weather 💧
UV exposure in Clark County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Clark County?Get accurate weather forecasts for Clark County, located at latitude 45.639 and longitude -122.661. Stay updated with localized weather information tailored for Clark County.
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