Pierce County (Tacoma)
September
Weather in Pierce County, Washington for September 2026
Your guide to Pierce County weather in September - trends and predictions
Until now, September 2026 in Pierce County is slightly cooler than the historical average by 1.5 °F.
The forecast for the upcoming days in Pierce County predicts a temperature of 18.9 °F, which is slightly above the historical average.
In general, the average temperature in Pierce County at the beginning of September is 25.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °F by the end of September.
Pierce County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 40.7 mm.
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Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
22°/12°
Temperatures
11 km/h
Avg max wind
70 %
Avg humidity
Pierce County Weather September
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Temperatures trend during September in Pierce County
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September weather in Pierce County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 2 | Overcast | 26° /13° | 9.9 mm | 5 | |
| Sept. 3 |  Light drizzle | 23° /13° | 8.4 mm | 4 | |
| Sept. 4 | Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 5 |  Mist | 28° /12° | 0.1 mm | 6 | |
| Sept. 6 |  Sunny | 27° /12° | 0 mm | 6 | |
| Sept. 7 |  Cloudy | 25° /13° | 0 mm | 5 | |
| Sept. 8 | Sunny | 25° /11° | 0 mm | 6 | |
| Sept. 9 | Overcast | 24° /12° | 0 mm | 5 | |
| Sept. 10 | Cloudy | 24° /12° | 0 mm | 5 | |
| Sept. 11 | Overcast | 19° /11° | 0.6 mm | 4 | |
| Sept. 12 | Overcast | 20° /10° | 1 mm | 4 | |
| Sept. 13 | Mist | 19° /11° | 3.8 mm | 4 | |
| Sept. 14 | Mist | 22° /11° | 0.6 mm | 4 | |
| Sept. 15 | Sunny | 23° /10° | 0.8 mm | 5 | |
| Sept. 16 | Sunny | 26° /10° | 0 mm | 6 | |
| Sept. 17 | Overcast | 22° /12° | 0 mm | 5 | |
| Sept. 18 | Overcast | 19° /11° | 0 mm | 4 | |
| Sept. 19 | Cloudy | 21° /11° | 0 mm | 5 | |
| Sept. 20 |  Light rain shower | 20° /10° | 0.4 mm | 5 | |
| Sept. 21 | Overcast | 21° /10° | 1.1 mm | 5 | |
| Sept. 22 | Sunny | 23° /11° | 0.5 mm | 5 | |
| Sept. 23 | Overcast | 22° /11° | 1.9 mm | 4 | |
| Sept. 24 | Light rain | 21° /11° | 4.9 mm | 4 | |
| Sept. 25 |  Moderate or heavy rain shower | 18° /12° | 8.4 mm | 4 | |
| Sept. 26 | Sunny | 18° /7° | 0 mm | 3.7 | |
| Sept. 27 | Sunny | 19° /8° | 0 mm | 3.4 | |
| Sept. 28 | Overcast | 20° /7° | 0 mm | 3.8 | |
| Sept. 29 | Overcast | 15° /12° | 3.1 mm | 0.6 | |
| Sept. 30 | Patchy rain possible | 16° /10° | 0.3 mm | 4 | |
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Important Notice
Our weather forecast for Pierce 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 Pierce County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Pierce County in September - FAQ
What are the expected maximum and minimum temperatures in Pierce County during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Pierce County during September?
In September, Pierce County can expect light to moderate rainfall, totaling 40.7 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Pierce County during September?
The average wind speed in Pierce County during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Pierce County
Explore the daily rainfall trends and prepare for Pierce Countys September weather 💧
Typically, Pierce County has 8 rainy days in September with a total of 40.7 mm of rainfall.
UV exposure in Pierce County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Pierce County?Get accurate weather forecasts for Pierce County, located at latitude 47.253 and longitude -122.444. Stay updated with localized weather information tailored for Pierce County.
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