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United StatesThe weather in September in Ketchikan
It's cool to moderate in September in Ketchikan with an average temperature of 16°C. Temperatures this month range from a low of 14°C to a high of 18°C. At night, you can expect temperatures between 9°C and 12°C.
Looking for sun and warm weather? September isn’t a good month to be in Ketchikan. The temperatures are too low for a warm stay this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Ketchikan, Alaska. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 27°C in 2017, Ketchikan reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 10°C in 2015. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 16°C.
Water temperature
The water temperature at Ketchikan is 14°C this month. This is too cold to swim without protective gear.
Rainfall amount
In September, there is an average of 398 mm of precipitation, spread over 28 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Ketchikan
Click on any day in September to get detailed info about the usual weather on that day in Ketchikan. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Ketchikan | New York | |
|---|---|---|
| Average temperature | 16°C | 27°C |
| Max. temperature | 18°C | 31°C |
| Min. temperature | 9°C | -5°C |
| Total precipitation | 398 mm | 57 mm |
| Rainy days | 28 days | 9 days |
Start of September
The month of September starts in Ketchikan with mild temps, averaging around 18°C during the day and nights around 12°C.
Mid September
By mid-September, daytime temps drop to around 17°C, with nights around 10°C. There’s a high chance of precipitation during this time.
End of September
By the end of September, the average daytime temperature in Ketchikan is around 15°C, while nighttime temps are about 11°C. There’s a significant chance of many days with precipitation.
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UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Ketchikan for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Ketchikan, Alaska. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Ketchikan
Temperature in September in Ketchikan over the years
Precipitation charts
These charts show the average amount of precipitation in September in Ketchikan, Alaska. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Ketchikan
Total precipitation in September in Ketchikan over the years
Daily UV index in September in Ketchikan
This chart shows the average daily UV index in September in Ketchikan, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Ketchikan
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Average weather in Ketchikan by month
Click on a month below to see detailed weather info for Ketchikan. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.