United StatesThe weather in September in Grand Teton National Park
It's pleasantly warm in September in Grand Teton National Park with an average temperature of 21°C. Temperatures this month range from a low of 17°C to a high of 26°C. At night, you can expect temperatures between 2°C and 6°C.
Looking for great weather? September is a good time to be in Grand Teton National Park. The temperatures are nice, and there’s not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Grand Teton National Park, Wyoming. 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 33°C in 2022, Grand Teton National Park reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 4°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of -8°C to a highest value of 12°C.
Precipitation and snowfall
In September, there is an average of 41 mm of precipitation, spread over 7 days. Of the total precipitation, about 1,7 cm falls as snow in September. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in September for Grand Teton National Park
Click on any day in September to get detailed info about the usual weather on that day in Grand Teton National Park. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Grand Teton National Park | New York | |
|---|---|---|
| Average temperature | 21°C | 27°C |
| Max. temperature | 26°C | 31°C |
| Min. temperature | 2°C | -5°C |
| Total precipitation | 41 mm | 57 mm |
| Rainy days | 7 days | 9 days |
| Total snowfall | 1,7 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Grand Teton National Park with warm temps, averaging around 25°C during the day and nights around 5°C.
Mid September
By mid-September, daytime temps drop to around 21°C, with nights around 4°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Grand Teton National Park is around 19°C, while nighttime temps are about 3°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Grand Teton National Park for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Grand Teton National Park, Wyoming. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Grand Teton National Park
Temperature in September in Grand Teton National Park over the years
Precipitation charts
These charts show the average amount of precipitation in September in Grand Teton National Park, Wyoming. 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 Grand Teton National Park
Total precipitation in September in Grand Teton National Park over the years
Daily Snowfall in September in Grand Teton National Park
Snowfall in September in Grand Teton National Park per year
Daily UV index in September in Grand Teton National Park
This chart shows the average daily UV index in September in Grand Teton 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.
Weather experiences in September in Grand Teton National Park
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Average weather in Grand Teton National Park by month
Click on a month below to see detailed weather info for Grand Teton National Park. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.