Weather in Ketchikan, Alaska for September 2025
Until now, September 2025 in Ketchikan has been nearly identical to the historical average, with a temperature of 15.8 °F (showing only a slight deviation of 0.5 °F).
Expect cooler weather in the next days in Ketchikan with the forecast suggesting a temperature of 13.2 °F, lower than the historical average.
In general, the average temperature in Ketchikan at the beginning of September is 15.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.1 °F by the end of September.
Ketchikan experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 447.6 mm.
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Ketchikan Weather September
Temperatures trend during September in Ketchikan
September weather in Ketchikan day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 18° /11° | 2.7 mm | 4 | |
| Sept. 2 | Overcast | 18° /11° | 0 mm | 5 | |
| Sept. 3 |  Cloudy | 15° /10° | 0 mm | 4 | |
| Sept. 4 |  Light rain shower | 16° /11° | 3.3 mm | 4 | |
| Sept. 5 | Light rain shower | 14° /11° | 9.5 mm | 3 | |
| Sept. 6 | Cloudy | 15° /10° | 0.2 mm | 4 | |
| Sept. 7 | Light rain shower | 15° /11° | 0.2 mm | 4 | |
| Sept. 8 | Light rain shower | 15° /10° | 0.1 mm | 4 | |
| Sept. 9 | Overcast | 16° /10° | 0 mm | 4 | |
| Sept. 10 |  Patchy light drizzle | 15° /10° | 2.3 mm | 3 | |
| Sept. 11 |  Moderate rain | 15° /10° | 29.3 mm | 4 | |
| Sept. 12 | Moderate rain | 12° /10° | 9 mm | 3 | |
| Sept. 13 |  Mist | 13° /9° | 3.7 mm | 3 | |
| Sept. 14 | Overcast | 13° /10° | 0 mm | 0.8 | |
| Sept. 15 |  Heavy rain | 12° /9° | 162.6 mm | 0.1 | |
| Sept. 16 | Heavy rain | 17° /12° | 54.8 mm | 0.7 | |
| Sept. 17 | Moderate rain | 14° /10° | 5.2 mm | 0.4 | |
| Sept. 18 | Patchy rain possible | 13° /10° | 0.2 mm | 0 | |
| Sept. 19 | Patchy rain possible | 14° /10° | 1.2 mm | 3 | |
| Sept. 20 | Patchy rain possible | 14° /10° | 3.7 mm | 3 | |
| Sept. 21 | Moderate rain | 11° /10° | 14.7 mm | 3 | |
| Sept. 22 | Moderate rain | 12° /9° | 7.3 mm | 2 | |
| Sept. 23 | Moderate rain | 13° /10° | 7.3 mm | 3 | |
| Sept. 24 | Patchy rain possible | 13° /9° | 2.1 mm | 3 | |
| Sept. 25 | Patchy rain possible | 14° /8° | 0.2 mm | 3 | |
| Sept. 26 | Patchy rain possible | 11° /8° | 0.5 mm | 2 | |
| 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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Ketchikan in September - FAQ
September rainfall patterns in Ketchikan
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Where is Ketchikan?Get accurate weather forecasts for Ketchikan, located at latitude 55.342 and longitude -131.648. Stay updated with localized weather information tailored for Ketchikan.