September weather forecast
Jackson, WY

englishespañol中文
Share
A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming
A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming

Weather in September

The arrival of September instigates a shift in Jackson's weather once again. The temperature marginally recedes from the sultry summer highs, settling between 37.2°F (2.9°C) and 62.8°F (17.1°C). September's mere dusting of snowfall at 5.12" (130mm), signals the gradual return of the eagerly awaited winter. The receding daylight and the encroaching chill are unmistakable signs of the impending fall in full swing.

Temperature

The average high-temperature in Jackson, Wyoming, decreases in September, shifting from an agreeable 72.1°F (22.3°C) in August to a refreshing 62.8°F (17.1°C). September nights see a notable contrast from daytime highs, with the nighttime temperature averaging at a wintry 37.2°F (2.9°C).

Humidity

In Jackson, the average relative humidity in September is 57%.

Rainfall

In Jackson, Wyoming, in September, during 10.8 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. Throughout the year, in Jackson, there are 103 rainfall days, and 29.84" (758mm) of precipitation is accumulated.

Snowfall

January through December are months with snowfall in Jackson. In Jackson, in September, during 3.3 snowfall days, 5.12" (130mm) of snow is typically accumulated. In Jackson, during the entire year, snow falls for 173.6 days and aggregates up to 181.26" (4604mm) of snow.

Daylight

In September, the average length of the day in Jackson is 12h and 29min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:05 pm MDT.

Sunshine

In Jackson, Wyoming, the average sunshine in September is 10h.

UV index

In September, the average daily maximum UV index in Jackson is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 2 during September translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
[Resources]

Frequently asked questions

What is the usual temperature for Jackson in September?

The average high-temperature, in September, in Jackson, is 62.8°F (17.1°C), while the average low-temperature is 37.2°F (2.9°C).

What is the average humidity in September in Jackson?

In September, the average relative humidity is 57%.

How much does it rain in Jackson in September?

In September, the rain falls for 10.8 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

How many days does it snow in September in Jackson?

In Jackson, Wyoming, in September, during 3.3 snowfall days, 5.12" (130mm) of snow is typically accumulated.

What is the average length of the day in September in Jackson?

In September, the average day length in Jackson is 12h and 29min.

What time are sunrise and sunset in September in Jackson?

In September, on the first day of the month, sunrise is at 6:47 am and sunset at 7:57 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 7:05 pm MDT.

How long on average sun shines in September in Jackson?

In Jackson, Wyoming, the average sunshine duration in September is 10h.

What is the UV index reading in September in Jackson?

In September, the average daily maximum UV index in Jackson, Wyoming, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Jackson, WY

Average temperature in September - Jackson, WY
  • Average high temperature in September: 62.8°F

The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is December (21.9°F).

  • Average low temperature in September: 37.2°F

The month with the highest average low temperature is July (43.5°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).

[Resources]

Average pressure in September
Jackson, WY

Average pressure in September - Jackson, WY
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

[Resources]

Average wind speed in September
Jackson, WY

Average wind speed in September - Jackson, WY
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

[Resources]

Average humidity in September
Jackson, WY

Average humidity in September - Jackson, WY
  • Average humidity in September: 57%

The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).

[Resources]

Average rainfall in September
Jackson, WY

Average rainfall in September - Jackson, WY
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is February (3.54").
The driest month (with the least rainfall) is August (1.34").

[Resources]

Average rainfall days in September
Jackson, WY

Average rainfall days in September - Jackson, WY
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (2.9 days).

[Resources]

Average snowfall in September
Jackson, WY

Average snowfall in September - Jackson, WY
  • Average snowfall in September: 5.12"

The month with the highest snowfall is February (29.33").
The month with the least snowfall is August (0.12").

[Resources]

Average snowfall days in September
Jackson, WY

Average snowfall days in September - Jackson, WY
  • Average snowfall days in September: 3.3 days

The month with the highest number of snowfall days is March (24.8 days).
The month with the least snowfall days is July (0.4 days).

[Resources]

Average daylight in September /
Average sunshine in September
Jackson, WY

Average daylight in September / Average sunshine in September - Jackson, WY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in September: 10h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

[Resources]

Average sunshine days in September
Jackson, WY

Average sunshine days in September - Jackson, WY
  • Average sunshine days in September: 15.3 days

The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (3.8 days).

[Resources]

Average UV index in September
Jackson, WY

Average UV index in September - Jackson, WY
  • Average UV index in September: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

[Resources]

Average cloud cover in September
Jackson, WY

Average cloud cover in September - Jackson, WY
  • Average cloud cover in September: 21

The month with the most cloud cover is February (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 16).

[Resources]

Average visibility in September
Jackson, WY

Average visibility in September - Jackson, WY
  • Average visibility in September: 6mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

[Resources]

Jackson, Wyoming, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location