Seattle
September
Weather in Seattle for September 2024
Your guide to Seattle weather in September - trends and predictions
Until now, September 2024 in Seattle has been nearly identical to the historical average, with a temperature of 23.8 °F (showing only a slight deviation of -0.1 °F).
The forecast for the next days in Seattle predicts a temperature of 18.3 °F, which is cooler than the historical average.
In general, the average temperature in Seattle at the beginning of September is 25.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16 °F by the end of September.
Seattle sees moderate rainfall in September, averaging 7 rainy days.
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23
Dry days
7
Rainy days
0
Snow days
21°/10°
Temperatures
11 km/h
Avg max wind
71 %
Avg humidity
Seattle in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | ||||||
| 2  28° | 3  22° | 4  22° | 5 26° | 6  26° | 7  26° | 8 26° |
| 9 24° | 10 25° | 11 18° | 12 20° | 13 21° | 14 23° | 15 26° |
| 16 23° | 17 16° | 18 17° | 19 20° | 20 20° | 21 21° | 22 20° |
| 23 23° | 24 17° | 25 19° | 26 18° | 27 16° | 28  10° | 29 16° |
| 30 16° |
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Temperatures trend during September in Seattle
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 | Mist | 27° /12° | 0 mm | 7 | |
| Sept. 2 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 3 | Patchy rain possible | 22° /14° | 0.1 mm | 5 | |
| Sept. 4 | Overcast | 22° /11° | 0 mm | 5 | |
| Sept. 5 | Overcast | 26° /12° | 0 mm | 7 | |
| Sept. 6 | Cloudy | 26° /11° | 0 mm | 6 | |
| Sept. 7 | Partly cloudy | 26° /11° | 0 mm | 7 | |
| Sept. 8 | Partly cloudy | 26° /11° | 0 mm | 6 | |
| Sept. 9 | Mist | 24° /11° | 0 mm | 6 | |
| Sept. 10 | Overcast | 25° /11° | 0 mm | 6 | |
| Sept. 11 | Overcast | 18° /13° | 1.5 mm | 4 | |
| Sept. 12 | Overcast | 20° /11° | 0.1 mm | 5 | |
| Sept. 13 | Overcast | 21° /10° | 0.1 mm | 5 | |
| Sept. 14 | Mist | 23° /10° | 1.7 mm | 5 | |
| Sept. 15 | Mist | 26° /9° | 0 mm | 6 | |
| Sept. 16 | Cloudy | 23° /12° | 0 mm | 4 | |
| Sept. 17 | Overcast | 16° /12° | 0 mm | 1 | |
| Sept. 18 | Overcast | 17° /15° | 0 mm | 3 | |
| Sept. 19 | Overcast | 20° /12° | 0 mm | 3 | |
| Sept. 20 | Partly cloudy | 20° /11° | 0.1 mm | 4 | |
| Sept. 21 | Partly cloudy | 21° /9° | 0 mm | 4 | |
| Sept. 22 | Sunny | 20° /12° | 0 mm | 4 | |
| Sept. 23 | Sunny | 23° /11° | 0 mm | 5 | |
| Sept. 24 | Patchy rain possible | 17° /13° | 3.3 mm | 3 | |
| Sept. 25 | Patchy rain possible | 19° /10° | 0.1 mm | 3 | |
| Sept. 26 | Patchy rain possible | 18° /8° | 1 mm | 3 | |
| Sept. 27 | Patchy rain possible | 16° /10° | 3.2 mm | 3 | |
| Sept. 28 | Moderate rain | 10° /9° | 5.9 mm | 2 | |
| Sept. 29 | Patchy rain possible | 16° /11° | 3.7 mm | 3 | |
| Sept. 30 | Mist | 16° /5° | 0 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Seattle 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 Seattle forecast closer to your planned date for the most up-to-date weather information.
Seattle in September - FAQ
What are the expected maximum and minimum temperatures in Seattle during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Seattle during September?
Moderate rainfall is anticipated in Seattle during September, with a total of 79.9 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Seattle during September?
The average wind speed in Seattle during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
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