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Grand Teton National Park (WY)
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Grand Teton National Park (WY)
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Weather in Grand Teton National Park, Wyoming for September 2026

Your guide to Grand Teton National Park weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Grand Teton National Park during September is quite rare, with fewer than 2 snowy days on average.
    According to Grand Teton National Park snow forecast for September 2026, 1 snowy day is expected until the end of the month at Monday, September 28.

    • Temperatures

  • Until now, September 2026 in Grand Teton National Park is slightly cooler than the historical average by 0.8 °F.

  • The forecast for the next days in Grand Teton National Park predicts temperatures to be around 14 °F, close to the historical average.

  • In general, the average temperature in Grand Teton National Park at the beginning of September is 20.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °F by the end of September.

    • Rain 🌧️

  • Grand Teton National Park experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 67.2 mm.

    • More

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Average dry days
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/4°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
56 %
Avg humidity

Grand Teton National Park Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
21°
2
Sunny
21°
3
Sunny
20°
4
Sunny
21°
5
Sunny
21°
6
Sunny
21°
7
Thundery outbreaks possible
17°
8
Sunny
17°
9
Thundery outbreaks possible
19°
10
Thundery outbreaks possible
21°
11
Patchy light rain with thunder
18°
12
Thundery outbreaks possible
18°
13
Thundery outbreaks possible
16°
14
Overcast
14°
15
Moderate or heavy rain with thunder
13°
16
Overcast
18°
17
Partly cloudy
17°
18
Sunny
18°
19
Light rain shower
10°
20
Patchy rain possible
10°
21
Sunny
17°
22
Overcast
18°
23
Sunny
19°
24
Sunny
21°
25
Sunny
19°
26
Overcast
18°
27
Cloudy
8°
28
Overcast
7°
29
Cloudy
11°
30
Sunny
11°

Temperatures trend during September in Grand Teton National Park

See the weather trend as well as the moving average line

September weather in Grand Teton National Park day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Partly cloudy
Partly cloudy
 21° /6° 2.2 mm 0 cm
Sept. 2 Sunny
Sunny
 21° /6° 0.1 mm 0 cm
Sept. 3 Sunny
Sunny
 20° /6° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 21° /6° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 21° /6° 0 mm 0 cm
Sept. 6 Sunny
Sunny
 21° /4° 0 mm 0 cm
Sept. 7 Thundery outbreaks possible
Thundery outbreaks possible
 17° /5° 1.6 mm 0 cm
Sept. 8 Sunny
Sunny
 17° /3° 6.2 mm 0 cm
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
 19° /4° 0 mm 0 cm
Sept. 10 Thundery outbreaks possible
Thundery outbreaks possible
 21° /4° 0.1 mm 0 cm
Sept. 11 Patchy light rain with thunder
Patchy light rain with thunder
 18° /6° 3.7 mm 0 cm
Sept. 12 Thundery outbreaks possible
Thundery outbreaks possible
 18° /3° 0.1 mm 0 cm
Sept. 13 Thundery outbreaks possible
Thundery outbreaks possible
 16° /5° 1.6 mm 0 cm
Sept. 14 Overcast
Overcast
 14° /2° 1 mm 0 cm
Sept. 15 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 13° /2° 6.8 mm 0 cm
Sept. 16 Overcast
Overcast
 18° /2° 0.2 mm 0 cm
Sept. 17 Partly cloudy
Partly cloudy
 17° /4° 1.6 mm 0 cm
Sept. 18 Sunny
Sunny
 18° /0° 0 mm 0 cm
Sept. 19 Light rain shower
Light rain shower
 10° /4° 5.2 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 10° /4° 1.5 mm 0 cm
Sept. 21 Sunny
Sunny
 17° /3° 0 mm 0 cm
Sept. 22 Overcast
Overcast
 18° /5° 0 mm 0 cm
Sept. 23 Sunny
Sunny
 19° /6° 0 mm 0 cm
Sept. 24 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 25 Sunny
Sunny
 19° /7° 0 mm 0 cm
Sept. 26 Overcast
Overcast
 18° /1° 2.2 mm 0 cm
Sept. 27 Cloudy
Cloudy
 8° /0° 0 mm 0 cm
Sept. 28 Overcast
Overcast
 7° /-1° 0.8 mm 0.3 cm
Sept. 29 Cloudy
Cloudy
 11° /-1° 0 mm 0 cm
Sept. 30 Sunny
Sunny
 11° /-3° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Grand Teton National Park in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grand Teton National Park forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Grand Teton National Park in September - FAQ

What are the expected maximum and minimum temperatures in Grand Teton National Park during September?
During September, expect a variety of temperatures with highs around 18° and lows near 4°, suitable for diverse activities and preferences.

How much rainfall should be expected in Grand Teton National Park during September?
Moderate rainfall is anticipated in Grand Teton National Park during September, with a total of 67.2 mm spread over approximately 6 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Grand Teton National Park during September?
The average wind speed in Grand Teton National Park during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

Grand Teton National Park snow forecast September 2026

Track daily snowfall levels and discover Grand Teton National Park’s snowy potential this September ❄️

September rainfall patterns in Grand Teton National Park

Explore the daily rainfall trends and prepare for Grand Teton National Parks September weather 💧
Typically, Grand Teton National Park has 6 rainy days in September with a total of 67.2 mm of rainfall.

UV exposure in Grand Teton National Park during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Grand Teton National Park?

Get accurate weather forecasts for Grand Teton National Park, located at latitude 43.79 and longitude -110.682. Stay updated with localized weather information tailored for Grand Teton National Park.

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