October weather forecast
Boulder, WY

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Weather in October

In October, Boulder takes a deeper plunge into autumn, with further dropping temperature averages. A re-emergence of snowfall occurs, recording an average of 2.52" (64mm), announcing the imminent arrival of winter. While it has shorter days and more cloudy periods, there is still an abundance of sunlight. The October breeze rustling through the multicolored leaves affords an enchanting spectacle for both locals and tourists. Admittedly, the colder weather means that residents must start prepping for the upcoming winter months.

Temperature

The shift into October in Boulder, Wyoming, brings a noticeable decrease in the average high-temperature, falling from a refreshing 67.3°F (19.6°C) in September to a fresh 50°F (10°C). In the month of October, the average temperature dips to a wintry 32.4°F (0.2°C) during the night.

Humidity

The average relative humidity in October in Boulder is 56%.

Rainfall

In Boulder, during October, the rain falls for 7.2 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, there are 102.6 rainfall days, and 10.75" (273mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Boulder. In Boulder, in October, snow falls for 5.5 days, with typically accumulated 2.52" (64mm) of snow. In Boulder, during the entire year, snow falls for 86.8 days and aggregates up to 41.77" (1061mm) of snow.

Daylight

In Boulder, the average length of the day in October is 11h and 2min.
On the first day of the month, sunrise is at 7:17 am and sunset at 6:59 pm. On the last day of October, in Boulder, sunrise is at 7:52 am and sunset at 6:12 pm MDT.

Sunshine

In Boulder, the average sunshine in October is 7.2h.

UV index

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in October transforms into the following instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Boulder in October?

Boulder in October has an average high-temperature of 50°F (10°C) and an average low-temperature of 32.4°F (0.2°C).

What is the average humidity in October in Boulder?

The average relative humidity in October is 56%.

How many days does it rain in October in Boulder?

In Boulder, in October, it is raining for 7.2 days, with typically 0.83" (21mm) of accumulated precipitation.

How many days does it snow in October in Boulder?

In Boulder, Wyoming, in October, snow falls for 5.5 days, with typically accumulated 2.52" (64mm) of snow.

How many hours of daylight does Boulder have in October?

The average day length in October is 11h and 2min.

When is the sunrise / sunset in October in Boulder?

In October, on the first day of the month, sunrise is at 7:17 am and sunset at 6:59 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 6:12 pm MDT.

How many hours of sunshine does Boulder have in October?

In Boulder, the average sunshine duration in October is 7.2h.

What is the month with the lowest UV index in Boulder?

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in October in Boulder?

In Boulder, the average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a low health threat 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 October
Boulder, WY

Average temperature in October - Boulder, WY
  • Average high temperature in October: 50°F

The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (23.9°F).

  • Average low temperature in October: 32.4°F

The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).

Average pressure in October
Boulder, WY

Average pressure in October - Boulder, WY
  • Average pressure in October: 30.05"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in October
Boulder, WY

Average wind speed in October - Boulder, WY
  • Average wind speed in October: 6.9mph

The windiest month (with the highest average wind speed) is June (8.1mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

Average humidity in October
Boulder, WY

Average humidity in October - Boulder, WY
  • Average humidity in October: 56%

The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).

Average rainfall in October
Boulder, WY

Average rainfall in October - Boulder, WY
  • Average rainfall in October: 0.83"

The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.51").

Average rainfall days in October
Boulder, WY

Average rainfall days in October - Boulder, WY
  • Average rainfall days in October: 7.2 days

The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.5 days).

Average snowfall in October
Boulder, WY

Average snowfall in October - Boulder, WY
  • Average snowfall in October: 2.52"

The month with the highest snowfall is February (7.32").
The months with the least snowfall are July and August (0").

Average snowfall days in October
Boulder, WY

Average snowfall days in October - Boulder, WY
  • Average snowfall days in October: 5.5 days

The month with the highest number of snowfall days is March (15.7 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in October /
Average sunshine in October
Boulder, WY

Average daylight in October / Average sunshine in October - Boulder, WY
  • Average daylight in October: 11h and 0min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in October: 7h and 1min

The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).

Average sunshine days in October
Boulder, WY

Average sunshine days in October - Boulder, WY
  • Average sunshine days in October: 19.6 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (9.7 days).

Average UV index in October
Boulder, WY

Average UV index in October - Boulder, WY
  • Average UV index in October: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

Average cloud cover in October
Boulder, WY

Average cloud cover in October - Boulder, WY
  • Average cloud cover in October: 20

The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 11).

Average visibility in October
Boulder, WY

Average visibility in October - Boulder, WY
  • Average visibility in October: 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 and February (4mi).

Boulder, Wyoming, USA

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