Temperatures in September
It's cool in September in Katmai National Park with an average temperature of 13°C. Temperatures this month range from a low of 10°C to a high of 15°C. At night, you can expect temperatures between 3°C and 9°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Katmai National Park 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 Katmai National Park with cool temperatures, averaging around 15°C during the day and nights close to 9°C. Plenty of days with a chance of precipitation.
Mid-September
By mid-September, the average daytime temperature drops to around 14°C, with nights close to 8°C. The chance of precipitation is high during this period.
End of September
By the end of September, the average daytime temperature in Katmai National Park will be around 12°C, with nights close to 6°C. There’s a significant chance of many days with precipitation.
Precipitation in September
In September, there is an average of 215 mm of precipitation, spread over 18 days. Of the total precipitation, about 1,2 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
Across the whole month, the average precipitation chance is 58% per day.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Katmai National Park. 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.
Katmai National Park in September |
UK | ||
|---|---|---|---|
 Average Temperature |
13°C | 20°C | |
 High Temp |
15°C | 22°C | |
| Low Temp |
10°C | 17°C | |
 Total Precipitation |
215 mm | 44 mm | |
| Rainy Days |
18 days | 8 days | |
 Total Snowfall |
1,2 cm | 0 cm | |
| Snowy Days |
1 day | 0 days | |
August
UV index
The UV index is a maximum of 4 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 Katmai National Park?
After some sun? Then September isn’t the best time to be in Katmai National Park. There’s too much chance of rain this month.
Temperature records for Katmai National Park in September
With 20°C, Katmai National Park hit the highest temperature in the last 10 years in September 2018. The lowest daytime temperature in this month was 2°C in 2021. The extreme night temperatures ranged from a low of -5°C to a high of 13°C.
Check out the climate of Katmai National Park for all months and discover the best travel time
Daily Temperature in September in Katmai National Park
This chart shows the average daily temperatures, both day and night, for each day in September in Katmai National Park, 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 Katmai National Park
The chart below shows the average daily precipitation in September for Katmai National Park, 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 Katmai National Park.
Daily Snowfall in September in Katmai National Park
This chart shows the average daily snowfall in September in Katmai National Park, measured in centimetres. The bottom of the chart shows the days of the month. The data is based on historical measurements and gives an idea of the average snowfall in September.
Daily UV Index in September in Katmai National Park
This chart shows the average daily UV index in September in Katmai National Park, 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 Katmai National Park Over the Years
This chart shows the average temperature in September in Katmai National Park, measured in degrees Celsius, over the past years.
Total Precipitation in September in Katmai National Park Over the Years
This chart shows the average precipitation in September in Katmai National Park, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Snowfall in September in Katmai National Park per year
This chart shows the average snowfall in September in Katmai National Park, measured in centimetres, over the past years.
Daily climate in September for Katmai National Park
Click on a specific day in September for detailed info on the typical weather on that day in Katmai National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Katmai National Park
Have you been to Katmai National Park in September?
Share your weather experience in September in Katmai National Park.
Average Weather in Katmai National Park by Month
Click on a month below to see detailed weather info for Katmai National Park. 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 Katmai National Park for all months at once
