Temperatures in September
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.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Ketchikan in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Ketchikan with mild temperatures, averaging around 18°C during the day and nights close to 12°C. Plenty of days with a chance of precipitation.
Mid-September
By mid-September, the average daytime temperature drops to around 17°C, with nights close to 10°C. The chance of precipitation is high during this period.
End of September
By the end of September, the average daytime temperature in Ketchikan will be around 15°C, with nights close to 11°C. There’s a significant chance of many days with precipitation.
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Water temperature
The water temperature at Ketchikan is 14°C this month. This is too cold to swim without protective gear.
Precipitation in September
In September, there is an average of 398 mm of precipitation, spread over 18 days. The wind speed is around 4 Bft, mostly coming from the South.
The average precipitation chance this month is 60% per day. Though that seems frequent, the weather’s variable. Some days have high and others have lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Ketchikan. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Ketchikan in September |
London | ||
|---|---|---|---|
 Average Temperature |
16°C | 20°C | |
 High Temp |
18°C | 22°C | |
| Low Temp |
14°C | 17°C | |
 Total Precipitation |
398 mm | 44 mm | |
| Rainy Days |
18 days | 8 days | |
August
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.
Is September a good time to visit Ketchikan?
Looking for sun and warm weather? Then September isn’t the best time to be in Ketchikan. The temperature is too low this month for a warm stay.
Temperature records for Ketchikan in September
With 27°C, Ketchikan hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was 10°C in 2015. The extreme night temperatures ranged from a low of 2°C to a high of 16°C.
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Daily Temperature in September in Ketchikan
This chart shows the average daily temperatures, both day and night, for each day in September in Ketchikan, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Ketchikan
The chart below shows the average daily precipitation in September for Ketchikan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 18 days of rain in Ketchikan.
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.
Temperature in September in Ketchikan Over the Years
This chart shows the average temperature in September in Ketchikan, measured in degrees Celsius, over the past years.
Total Precipitation in September in Ketchikan Over the Years
This chart shows the average precipitation in September in Ketchikan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Ketchikan
Click on a specific day in September for detailed info on the typical weather on that day in Ketchikan. Check out the historical temperatures and precipitation over the past 10 years on this day.
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.
Or check out the climate of Ketchikan for all months at once
