September weather forecast
Vernal, UT

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Great scenery of the rocky and sandy Arch in Vernal, Utah
Great scenery of the rocky and sandy Arch in Vernal, Utah

Weather in September

September marks the transition from summer to autumn. A decline in temperatures to 74.8°F (23.8°C) for highs and 52.9°F (11.6°C) for lows indicates the start of cooler nights. The fall color palette begins to adorn Vernal, asserting the arrival of fall. September's weather pattern integrates the warmth of the summer days with the coolness of autumn nights, creating a pleasant atmosphere. The equilibrium between day and night temperatures makes this month an exemplar of ideal climatic conditions.

Temperature

The move into September in Vernal indicates a slight reduction in the average high-temperature, down from August's 83.3°F (28.5°C) to a still moderately hot 74.8°F (23.8°C). Vernal, in September, displays a significant temperature downturn during the night, with an average reading of 52.9°F (11.6°C).

Humidity

In Vernal, the average relative humidity in September is 35%.

Rainfall

In Vernal, in September, during 6.4 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. Throughout the year, there are 83.2 rainfall days, and 5.75" (146mm) of precipitation is accumulated.

Snowfall

In Vernal, snow does not fall in June through September.

Daylight

In September, the average length of the day in Vernal is 12h and 26min.
On the first day of September, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:01 pm MDT.

Sunshine

In Vernal, the average sunshine in September is 10.9h.

UV index

In September, the average daily maximum UV index in Vernal is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a daily UV index of 5 turns into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
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Frequently asked questions

What are the temperatures in Vernal in September?

September temperatures in Vernal, Utah, vary between a high-temperature of 74.8°F (23.8°C) and a low-temperature of 52.9°F (11.6°C).

What is the average humidity in September in Vernal?

In September, the average relative humidity is 35%.

How much does it rain in Vernal in September?

In Vernal, Utah, during September, the rain falls for 6.4 days and regularly aggregates up to 0.43" (11mm) of precipitation.

When it does not snow in Vernal?

In Vernal, snow does not fall in June through September.

Does it snow in Vernal in September?

In Vernal, Utah, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Vernal have in September?

The average day length in September in Vernal is 12h and 26min.

What time are sunrise and sunset in September in Vernal?

On the first day of September, sunrise is at 6:46 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 7:01 pm MDT.

How long on average sun shines in September in Vernal?

In September, the average sunshine duration in Vernal, Utah, is 10.9h.

What is the UV index reading in September in Vernal?

In Vernal, Utah, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Vernal, UT

Average temperature in September - Vernal, UT
  • Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in September: 52.9°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (12.7°F).

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Average pressure in September
Vernal, UT

Average pressure in September - Vernal, UT
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Vernal, UT

Average wind speed in September - Vernal, UT
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (3.4mph).

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Average humidity in September
Vernal, UT

Average humidity in September - Vernal, UT
  • Average humidity in September: 35%

The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is June (30%).

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Average rainfall in September
Vernal, UT

Average rainfall in September - Vernal, UT
  • Average rainfall in September: 0.43"

The wettest month (with the highest rainfall) is April (0.71").
The driest month (with the least rainfall) is November (0.31").

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Average rainfall days in September
Vernal, UT

Average rainfall days in September - Vernal, UT
  • Average rainfall days in September: 6.4 days

The month with the highest number of rainy days is April (10.8 days).
The month with the least rainy days is January (5.4 days).

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Average snowfall in September
Vernal, UT

Average snowfall in September - Vernal, UT
  • Average snowfall in September: 0"

The month with the highest snowfall is December (4.29").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Vernal, UT

Average snowfall days in September - Vernal, UT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Vernal, UT

Average daylight in September / Average sunshine in September - Vernal, UT
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 10h and 5min

The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 30min).

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Average sunshine days in September
Vernal, UT

Average sunshine days in September - Vernal, UT
  • Average sunshine days in September: 20.7 days

The month with the most sunshine days is October (22.4 days).
The month with the least sunshine days is April (15.3 days).

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Average UV index in September
Vernal, UT

Average UV index in September - Vernal, UT
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Vernal, UT

Average cloud cover in September - Vernal, UT
  • Average cloud cover in September: 11

The month with the most cloud cover is February (Cloud cover 30).
The months with the least cloud cover are August and September (Cloud cover 11).

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Average visibility in September
Vernal, UT

Average visibility in September - Vernal, UT
  • Average visibility in September: 6mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).

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Vernal, Utah, USA

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