September weather forecast and climate
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
The first month of the autumn, September, is still a pleasant month in Jackson, Wyoming, with temperature in the range of an average low of 31.5°F (-0.3°C) and an average high of 71.2°F (21.8°C).

Temperature

In Jackson, in September, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 31.5°F (-0.3°C).

Rainfall

In September, in Jackson, the rain falls for 8 days. Throughout September, 1.3" (33.5mm) of precipitation is accumulated. Throughout the year, in Jackson, there are 108.5 rainfall days, and 16.8" (426.2mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Jackson, Wyoming.

Daylight

In Jackson, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 9h.

UV index

In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the average person.
The average daily UV index of 7 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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.

What is the temperature in September in Jackson?

In Jackson, Wyoming, in September, the average high-temperature is 71.2°F (21.8°C), and the average low-temperature is 31.5°F (-0.3°C).

How much does it rain in Jackson in September?

In Jackson, in September, it is raining for 8 days, with typically 1.3" (33.5mm) of accumulated precipitation.

When does it start to snow in Jackson?

September is the first month it typically snows in Jackson, Wyoming. Throughout September, Jackson receives 0.1" (2.5mm) of snow.

How many hours of daylight does Jackson have in September?

In September, the average length of the day in Jackson, Wyoming, is 12.5h.

How long on average sun shines in September in Jackson?

In Jackson, the average sunshine in September is 9h.

What is the UV index intensity in September in Jackson?

In September, the average daily maximum UV index in Jackson is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays.
Average temperature in September - Jackson, WY
  • Average high temperature in September: 71.3°F

The warmest month (with the highest average high temperature) is July (81.9°F).
Months with the lowest average high temperature are January and December (28.2°F).

  • Average low temperature in September: 31.4°F

The month with the highest average low temperature is July (40.9°F).
The coldest month (with the lowest average low temperature) is January (5°F).

Average rainfall in September - Jackson, WY
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the lowest rainfall) is February (1.1").

Average rainfall days in September - Jackson, WY
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is January (11.3 days).
The month with the lowest number of rainy days is July (7.5 days).

Average snowfall in September - Jackson, WY
  • Average snowfall in September: 0.1"

The month with the highest snowfall is December (18.6").
Months with the lowest snowfall are July and August (0").

Average snowfall days in September - Jackson, WY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (9.6 days).
Months with the lowest number of snowfall days are July, August and September (0 days).

Average daylight in September / Average sunshine in September - Jackson, WY
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 9h

Months with most sunshine are June and July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 4h).

Average UV index in September - Jackson, WY
  • Average UV index in September: 7

The month with the highest UV index is July (UV index 10).
The month with the lowest UV index is December (UV index 1).

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