Ketchikan
September
Weather in Ketchikan for September 2025
Your guide to Ketchikan weather in September - trends and predictions
In general, the average temperature in Ketchikan at the beginning of September is 14.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 10.7 °F by the end of September.
Ketchikan experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
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8
Dry days
22
Rainy days
0
Snow days
13°/8°
Temperatures
17 km/h
Avg max wind
86 %
Avg humidity
Ketchikan in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 16° | 3  15° | 4  16° | 5 13° | 6 14° | 7 14° |
| 8 15° | 9 16° | 10  15° | 11  14° | 12 12° | 13  13° | 14 13° |
| 15 13° | 16  13° | 17  11° | 18 11° | 19 13° | 20 12° | 21 12° |
| 22 12° | 23 11° | 24 11° | 25 12° | 26 12° | 27 11° | 28 10° |
| 29  10° | 30 9° |
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Temperatures trend during September in Ketchikan
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 | Overcast | 16° /11° | 4.1 mm | 4 | |
| Sept. 2 | Overcast | 16° /10° | 0 mm | 5 | |
| Sept. 3 | Cloudy | 15° /9° | 0 mm | 4 | |
| Sept. 4 | Light rain shower | 16° /10° | 4.9 mm | 4 | |
| Sept. 5 | Light rain shower | 13° /10° | 14.3 mm | 3 | |
| Sept. 6 | Cloudy | 14° /10° | 0.3 mm | 4 | |
| Sept. 7 | Light rain shower | 14° /10° | 0.4 mm | 4 | |
| Sept. 8 | Light rain shower | 15° /10° | 0.2 mm | 4 | |
| Sept. 9 | Overcast | 16° /9° | 0 mm | 4 | |
| Sept. 10 | Patchy light drizzle | 15° /9° | 3.4 mm | 4 | |
| Sept. 11 | Moderate rain | 14° /9° | 15.4 mm | 4 | |
| Sept. 12 | Moderate rain | 12° /10° | 13.5 mm | 3 | |
| Sept. 13 | Mist | 13° /9° | 3.7 mm | 3 | |
| Sept. 14 | Moderate rain | 13° /9° | 23.5 mm | 3 | |
| Sept. 15 | Light rain shower | 13° /8° | 18.6 mm | 3 | |
| Sept. 16 | Moderate or heavy rain with thunder | 13° /9° | 35.2 mm | 3 | |
| Sept. 17 | Moderate or heavy rain shower | 11° /9° | 32.2 mm | 3 | |
| Sept. 18 | Light rain shower | 11° /8° | 22.2 mm | 3 | |
| Sept. 19 | Light rain shower | 13° /9° | 7.4 mm | 3 | |
| Sept. 20 | Mist | 12° /7° | 9.8 mm | 3 | |
| Sept. 21 | Moderate rain | 12° /9° | 37.2 mm | 3 | |
| Sept. 22 | Moderate rain | 12° /8° | 23 mm | 3 | |
| Sept. 23 | Moderate or heavy rain shower | 11° /9° | 52.1 mm | 3 | |
| Sept. 24 | Moderate rain | 11° /8° | 18.9 mm | 3 | |
| Sept. 25 | Light rain | 12° /7° | 18.1 mm | 3 | |
| Sept. 26 | Moderate or heavy rain with thunder | 12° /7° | 16.7 mm | 3 | |
| Sept. 27 | Moderate or heavy rain with thunder | 11° /8° | 32.5 mm | 3 | |
| Sept. 28 | Patchy rain possible | 10° /7° | 2.4 mm | 3 | |
| Sept. 29 | Partly cloudy | 10° /6° | 1.9 mm | 3 | |
| Sept. 30 | Overcast | 9° /6° | 35.8 mm | 3 | |
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Important Notice
Our weather forecast for Ketchikan 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 Ketchikan forecast closer to your planned date for the most up-to-date weather information.
Ketchikan in September - FAQ
What are the expected maximum and minimum temperatures in Ketchikan during September?
During September, expect a variety of temperatures with highs around 13° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ketchikan during September?
Significant rainfall exceeding 516.3 mm is expected in Ketchikan during September, occurring over more than 22 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ketchikan during September?
The average wind speed in Ketchikan during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Ketchikan
Explore the daily rainfall trends and prepare for Ketchikans September weather 💧
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