September weather forecast
Jackson, WY

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

September, the first month of the autumn in Jackson, is still a comfortable month, with an average temperature varying between 37.2°F (2.9°C) and 62.8°F (17.1°C).

Temperature

In Jackson, the average high-temperature in September decreases from an agreeable 72.1°F (22.3°C) in August to a comfortable 62.8°F (17.1°C). In September, the average low-temperature is 37.2°F (2.9°C).

Humidity

The average relative humidity in September is 57%.

Rainfall

In Jackson, it is raining for 10.8 days, with typically 1.77" (45mm) of accumulated precipitation. In Jackson, Wyoming, during the entire year, the rain falls for 103 days and collects up to 29.84" (758mm) of precipitation.

Snowfall

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

Daylight

In Jackson, the average length of the day in September is 12h and 29min.
On the first day of September, sunrise is at 6:47 am and sunset at 7:58 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 7:06 pm MDT.

Sunshine

The average sunshine in September is 10h.

UV index

In Jackson, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in September interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Jackson?

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

How many days does it rain in September in Jackson?

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

How much does it snow in Jackson in September?

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?

The average day length in September in Jackson is 12h and 29min.

When 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 7:58 pm. On the last day of the month, in Jackson, Wyoming, sunrise is at 7:19 am and sunset at 7:06 pm MDT.

How many hours of sunshine does Jackson have in September?

The average sunshine duration in September in Jackson 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 reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 29min

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

  • 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).

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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).

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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).

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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).

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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).

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