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United States weather

Weather in Franklin County, Washington for September 2025

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

    Temperatures

  • Until now, September 2025 in Franklin County has been nearly identical to the historical average, with a temperature of 31.6 °F (showing only a slight deviation of 0.1 °F).

  • The forecast for the next days in Franklin County predicts a temperature of 25.8 °F, which is cooler than the historical average.

  • In general, the average temperature in Franklin County at the beginning of September is 34.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.1 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Franklin County experiences minimal rainfall in September.

    • More

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Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
28°/13°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
43 %
Avg humidity

Franklin County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain
35°
2
Patchy rain possible
36°
3
Sunny
34°
4
Overcast
34°
5
Sunny
34°
6
Sunny
34°
7
Sunny
34°
8
Partly cloudy
33°
9
Sunny
30°
10
Partly cloudy
32°
11
Overcast
26°
12
Overcast
28°
13
Sunny
29°
14
Sunny
26°
15
Sunny
28°
16
Sunny
31°
17
Sunny
35°
18
Sunny
32°
19
Sunny
31°
20
Sunny
32°
21
Partly cloudy
27°
22
Sunny
28°
23
Patchy rain possible
24°
24
Partly cloudy
21°
25
Sunny
21°
26
Thundery outbreaks possible
22°
27
Sunny
23°
28
Partly cloudy
22°
29
Partly cloudy
18°
30
Patchy rain possible
21°

Temperatures trend during September in Franklin County

See the weather trend as well as the moving average line

September weather in Franklin County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Light rain
Light rain
 35° /17° 2.5 mm 8
Sept. 2 Patchy rain possible
Patchy rain possible
 36° /17° 0.2 mm 8
Sept. 3 Sunny
Sunny
 34° /18° 0.1 mm 8
Sept. 4 Overcast
Overcast
 34° /16° 0 mm 7
Sept. 5 Sunny
Sunny
 34° /17° 0 mm 8
Sept. 6 Sunny
Sunny
 34° /17° 0 mm 8
Sept. 7 Sunny
Sunny
 34° /17° 0 mm 8
Sept. 8 Partly cloudy
Partly cloudy
 33° /17° 0 mm 8
Sept. 9 Sunny
Sunny
 30° /16° 0 mm 7
Sept. 10 Partly cloudy
Partly cloudy
 32° /15° 0 mm 7
Sept. 11 Overcast
Overcast
 26° /16° 2.7 mm 6
Sept. 12 Overcast
Overcast
 28° /13° 0 mm 6
Sept. 13 Sunny
Sunny
 29° /13° 0 mm 7
Sept. 14 Sunny
Sunny
 26° /13° 1.5 mm 7
Sept. 15 Sunny
Sunny
 28° /12° 0 mm 7
Sept. 16 Sunny
Sunny
 31° /13° 0 mm 8
Sept. 17 Sunny
Sunny
 35° /14° 0 mm 1.3
Sept. 18 Sunny
Sunny
 32° /14° 0 mm 1.3
Sept. 19 Sunny
Sunny
 31° /14° 0 mm 1.2
Sept. 20 Sunny
Sunny
 32° /15° 0 mm 1.2
Sept. 21 Partly cloudy
Partly cloudy
 27° /16° 0.1 mm 0
Sept. 22 Sunny
Sunny
 28° /12° 0 mm 5
Sept. 23 Patchy rain possible
Patchy rain possible
 24° /13° 2.7 mm 4
Sept. 24 Partly cloudy
Partly cloudy
 21° /13° 0 mm 5
Sept. 25 Sunny
Sunny
 21° /13° 0 mm 5
Sept. 26 Thundery outbreaks possible
Thundery outbreaks possible
 22° /14° 0.1 mm 4
Sept. 27 Sunny
Sunny
 23° /12° 0 mm 5
Sept. 28 Partly cloudy
Partly cloudy
 22° /14° 0 mm 5
Sept. 29 Partly cloudy
Partly cloudy
 18° /9° 0 mm 4
Sept. 30 Patchy rain possible
Patchy rain possible
 21° /5° 1.7 mm 5
Next
Important Notice
Our weather forecast for Franklin 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 Franklin County forecast closer to your planned date for the most up-to-date weather information.
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Franklin County in September - FAQ

What are the expected maximum and minimum temperatures in Franklin County during September?
Enjoy moderate daytime temperatures of up to 28° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Franklin County during September?
Expect minimal rainfall in Franklin County during September, with a total of 10.4 mm over approximately 4 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Franklin County during September?
The average wind speed in Franklin County during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Franklin County

Explore the daily rainfall trends and prepare for Franklin Countys September weather 💧

UV exposure in Franklin 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 Franklin County?

Get accurate weather forecasts for Franklin County, located at latitude 46.245 and longitude -119.196. Stay updated with localized weather information tailored for Franklin County.

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