September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average pressure in September
Average wind speed in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average daylight in September
Average sunshine in September
Average sunshine days in September
Average UV index in September
Average cloud cover in September
Average visibility in September

The crossroads near a large lit temple in Rexburg, Idaho, with a view of the rest of the city and a colorful, cloudy sunset sky on the horizon

Weather in September

September brings along the onset of fall and with it an alteration in Rexburg's weather conditions. Temperatures experience a marked decrease, with highs averaging around 72.7°F (22.6°C), signaling the transition from summer to autumn. Sunshine remains abundant but no longer bears the intensity of the summer sun. September marks the beginning of autumn's lovely hues, accomplished with crisp mornings and cooler nights. Moving into October, the change in seasons becomes even more evident.

Temperature

In Rexburg, entering September brings a temperature decrement, reducing from August's warm 82.9°F (28.3°C) to an agreeable 72.7°F (22.6°C). In the face of high daytime temperatures, Rexburg witnesses a consistent average nighttime low of 47.3°F (8.5°C) during September.

Humidity

In September, the average relative humidity in Rexburg is 43%.

Rainfall

In September, in Rexburg, the rain falls for 9 days. Throughout September, 0.91" (23mm) of precipitation is accumulated. In Rexburg, during the entire year, the rain falls for 120.3 days and collects up to 11.02" (280mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 84.8 snowfall days, and 31.85" (809mm) of snow is accumulated.

Daylight

In Rexburg, the average length of the day in September is 12h and 29min.
On the first day of September, sunrise is at 6:51 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 7:09 pm MDT.

Sunshine

In September, the average sunshine is 10h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 4 suggests these recommendations:
Make use of precautions - It is urged to ward off sun damage. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.

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Frequently asked questions

What is the temperature in September in Rexburg?

In September, in Rexburg, the average high-temperature is 72.7°F (22.6°C), and the average low-temperature is 47.3°F (8.5°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in July is appraised at 84.2°F (29°C).

What is the average humidity in September in Rexburg?

In September, the average relative humidity in Rexburg is 43%.

How many days does it rain in September in Rexburg?

In September, the rain falls for 9 days. Throughout September, 0.91" (23mm) of precipitation is accumulated.

When does it start to snow in Rexburg?

September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Rexburg have in September?

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

What time are sunrise and sunset in September in Rexburg?

In September, on the first day of the month, sunrise is at 6:51 am and sunset at 8:02 pm. On the last day of the month, in Rexburg, Idaho, sunrise is at 7:24 am and sunset at 7:09 pm MDT.

How many hours of sunshine does Rexburg have in September?

The average sunshine duration in September in Rexburg is 10h.

What is the UV index intensity in September in Rexburg?

In September, the average daily maximum UV index in Rexburg, Idaho, is 4. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

82.9°F 28.3°C

72.7°F 22.6°C

54.1°F 12.3°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.4mph 11.9km/h

6.7mph 10.8km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

16.8

17.6

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Rexburg, ID

Average high temperature in September: 72.7°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is December (26.6°F).

Average low temperature in September: 47.3°F

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).

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Average pressure in September
Rexburg, ID

Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Rexburg, ID

Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is January (4.3mph).

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Average humidity in September
Rexburg, ID

Average humidity in September: 43%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (38%).

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Average rainfall in September
Rexburg, ID

Average rainfall in September: 0.91"

The wettest months (with the highest rainfall) are April and May (1.26").
The driest month (with the least rainfall) is July (0.39").

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Average rainfall days in September
Rexburg, ID

Average rainfall days in September: 9 days

The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is July (6.3 days).

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Average snowfall in September
Rexburg, ID

Average snowfall in September: 0.04"

The month with the highest snowfall is January (8.9").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Rexburg, ID

Average snowfall days in September: 0.1 days

The months with the highest number of snowfall days are January and February (18.1 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Rexburg, ID

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: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

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Average sunshine days in September
Rexburg, ID

Average sunshine days in September: 18 days

The month with the most sunshine days is July (20.6 days).
The month with the least sunshine days is February (8.8 days).

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Average UV index in September
Rexburg, ID

Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in September
Rexburg, ID

Average cloud cover in September: 16

The months with the most cloud cover are January and February (Cloud cover 53).
The months with the least cloud cover are July and August (Cloud cover 11).

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Average visibility in September
Rexburg, ID

Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

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September weather forecast
Rexburg, ID

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