Ketchikan, Alaska weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: July – August
What is the weather like in Ketchikan, Alaska in September?
In September, Ketchikan, Alaska is cool: daytime highs average 14 °C, and nights cool down to about 11 °C. The sea averages 12.5 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. It rains often – on about 20 days, adding up to 284 mm. All in all, September is not an ideal month for a holiday in Ketchikan, Alaska.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 60 | 36 | 10 |
| Day | 17° | 14° | 10° |
| Night | 13° | 11° | 7° |
| Sea | 14° | 13° | 10° |
| Sun | 6 h | 4 h | 3 h |
| Rain days | 17 | 20 | 22 |
More details for September
- Daylight
- 12 h 51 min06:17 – 19:07
- UV index
- 3 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 77 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−8America/Sitka
How the score comes together
- Temperatureweight 50 %64 %
- Sunshineweight 20 %18 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Ketchikan, Alaska in September: quick answers
Is Ketchikan, Alaska hot in September?
No. In September, Ketchikan, Alaska is cool: daytime highs average 14 °C and nights drop to about 11 °C.
Can you swim in Ketchikan, Alaska in September?
Only if you don't mind cold water: in September the sea averages just 12.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Ketchikan, Alaska in September?
It rains often – on about 20 days, adding up to 284 mm.
Ketchikan, Alaska month by month
The whole year in Ketchikan, AlaskaAll destinations: USAWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences