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United States weather

Weather in Pierce County, Washington for September 2025

Your guide to Pierce County weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Red Flag Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Pierce County is slightly cooler than the historical average by -1.6 °F.

  • Expect cooler weather in the next days in Pierce County with the forecast suggesting a temperature of 20.1 °F, lower than the historical average.

  • In general, the average temperature in Pierce County at the beginning of September is 26.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °F by the end of September.

    • Rain 🌧️

  • Pierce County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 49.8 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
22°/11°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Pierce County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Fog
26°
2
Cloudy
27°
3
Light drizzle
24°
4
Overcast
26°
5
Mist
29°
6
Partly cloudy
27°
7
Cloudy
25°
8
Partly cloudy
25°
9
Overcast
23°
10
Cloudy
24°
11
Overcast
18°
12
Overcast
20°
13
Mist
20°
14
Mist
22°
15
Sunny
24°
16
Weather Alert Sunny
34°
17
Sunny
26°
18
Partly cloudy
23°
19
Sunny
26°
20
Patchy rain possible
18°
21
Patchy rain possible
15°
22
Patchy rain possible
20°
23
Patchy rain possible
16°
24
Patchy rain possible
27°
25
Moderate rain
18°
26
Patchy rain possible
11°
27
Patchy rain possible
13°
28
Moderate rain
14°
29
Overcast
16°
30
Mist
17°

Temperatures trend during September in Pierce County

See the weather trend as well as the moving average line

September weather in Pierce County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Fog
Fog
 26° /13° 0 mm 6
Sept. 2 Cloudy
Cloudy
 27° /13° 0 mm 6
Sept. 3 Light drizzle
Light drizzle
 24° /14° 0.6 mm 5
Sept. 4 Overcast
Overcast
 26° /13° 0 mm 6
Sept. 5 Mist
Mist
 29° /14° 0 mm 7
Sept. 6 Partly cloudy
Partly cloudy
 27° /13° 0 mm 6
Sept. 7 Cloudy
Cloudy
 25° /13° 0 mm 6
Sept. 8 Partly cloudy
Partly cloudy
 25° /12° 0 mm 6
Sept. 9 Overcast
Overcast
 23° /12° 0 mm 5
Sept. 10 Cloudy
Cloudy
 24° /12° 0 mm 6
Sept. 11 Overcast
Overcast
 18° /12° 0.8 mm 4
Sept. 12 Overcast
Overcast
 20° /11° 0.2 mm 4
Sept. 13 Mist
Mist
 20° /11° 0 mm 5
Sept. 14 Mist
Mist
 22° /11° 0.7 mm 5
Sept. 15 Sunny
Sunny
 24° /10° 0 mm 6
Sept. 16 Sunny
Sunny
 34° /14° 0 mm 1.3
Sept. 17 Sunny
Sunny
 26° /16° 0 mm 1.2
Sept. 18 Partly cloudy
Partly cloudy
 23° /13° 0 mm 1.2
Sept. 19 Sunny
Sunny
 26° /11° 0 mm 1.1
Sept. 20 Patchy rain possible
Patchy rain possible
 18° /10° 0.3 mm 0
Sept. 21 Patchy rain possible
Patchy rain possible
 15° /13° 0.7 mm 3
Sept. 22 Patchy rain possible
Patchy rain possible
 20° /11° 0.7 mm 3
Sept. 23 Patchy rain possible
Patchy rain possible
 16° /13° 1.4 mm 3
Sept. 24 Patchy rain possible
Patchy rain possible
 27° /14° 0.9 mm 4
Sept. 25 Moderate rain
Moderate rain
 18° /10° 5.9 mm 3
Sept. 26 Patchy rain possible
Patchy rain possible
 11° /9° 2.5 mm 3
Sept. 27 Patchy rain possible
Patchy rain possible
 13° /9° 0.5 mm 3
Sept. 28 Moderate rain
Moderate rain
 14° /9° 5.7 mm 3
Sept. 29 Overcast
Overcast
 16° /7° 0 mm 4
Sept. 30 Mist
Mist
 17° /7° 0 mm 4
Next
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.
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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 11°. 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 49.8 mm across approximately 9 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 💧

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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Location coordinates 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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