The best times to visit Big Sky for ideal weather are

June 11th to September 30th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Big Sky Travel Info

Weather in Big Sky


Average temperatures in Big Sky vary drastically. Considering humidity, temperatures feel cold for most of the year with a very low chance of rain or snow throughout the year. The area is less temperate than some — in the 36th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Big Sky, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 91.4°F (33°C) with temperatures rarely dropping below 50.3°F (10.2°C) at night.

Big Sky Temperatures (Fahrenheit)


Big Sky Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Big Sky Perceived Temperature (F)


Big Sky Perceived Temperature (C)



Average Big Sky Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 35.9 23.8 12.9
Feb 38.4 26.5 15.7
Mar 50.9 36.3 24.1
Apr 58 42.3 28.9
May 67.2 51.6 37.4
Jun 77.5 60.2 44.1
Jul 89.5 69.5 50.1
Aug 87.3 66.7 47.7
Sep 78.3 58 40.5
Oct 61.1 44.6 31.3
Nov 43.9 30.8 19.2
Dec 32.5 21 9.8

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 2.2 -4.6 -10.6
Feb 3.6 -3.1 -9.1
Mar 10.5 2.4 -4.4
Apr 14.4 5.7 -1.7
May 19.6 10.9 3
Jun 25.3 15.7 6.7
Jul 31.9 20.8 10.1
Aug 30.7 19.3 8.7
Sep 25.7 14.4 4.7
Oct 16.2 7 -0.4
Nov 6.6 -0.7 -7.1
Dec 0.3 -6.1 -12.3



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Big Sky are January, February, and then December. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early January. For example, on the week of January 1st there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May with an average of 3 days of significant precipitation the week of May 21st.

When can you find snow in Big Sky? Weather stations report large amounts of snow likely to be deepest around January, especially close to early January. The best time to ski (if at all) in Big Sky is often around around April 9th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Big Sky.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Big Sky (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 1% 5 0.2
Feb 6% 1.2 0.4
Mar 8% 1.7 0.8
Apr 20% 3.4 1.5
May 22% 0 2.3
Jun 24% 0 2.7
Jul 6% 0 0.7
Aug 9% 0 1.2
Sep 11% 0 0.9
Oct 9% 0 0.9
Nov 8% 3.1 0.9
Dec 6% 4.1 0.5

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 1 12.7 0.5
Feb 6 3 1
Mar 8 4.3 2
Apr 20 8.6 3.8
May 22 0 5.8
Jun 24 0 6.9
Jul 6 0 1.8
Aug 9 0 3
Sep 11 0 2.3
Oct 9 0 2.3
Nov 8 7.9 2.3
Dec 6 10.4 1.3


Humidity and Wind

Big Sky has some humid months, and slightly dry months in the opposite season. The least humid month is July (34.4% relative humidity), and the most humid month is December (60.5%).

Wind in Big Sky is usually calm. The windiest month is April, followed by May and March. April’s average wind speed of around 6.1 knots (7 MPH or 11.3 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late March where average top sustained speeds reach 16.7 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Big Sky.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 4.3 Light breeze 11.2 Significant breeze
Feb 4.4 Light breeze 11.4 Significant breeze
Mar 5.5 Light breeze 14.4 Significant breeze
Apr 6.1 Light breeze 16 Significant breeze
May 5.5 Light breeze 14.6 Significant breeze
Jun 5 Light breeze 14.4 Significant breeze
Jul 4.9 Light breeze 14.2 Significant breeze
Aug 4.9 Light breeze 14.7 Significant breeze
Sep 4.5 Light breeze 12.6 Significant breeze
Oct 4.4 Light breeze 12.1 Significant breeze
Nov 4.3 Light breeze 11.6 Significant breeze
Dec 4 Light breeze 10.7 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 55.5%
Feb 53.9%
Mar 46.4%
Apr 43.5%
May 45.5%
Jun 45.1%
Jul 34.4%
Aug 34.8%
Sep 38.6%
Oct 49.8%
Nov 55.6%
Dec 60.5%


Is it Safe to Travel to Big Sky?

Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Big Sky, MT, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Big Sky in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.5 in December means 36.5% of the tourists vs. July.



Overall Big Sky Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 71.9°F (22.2°C) and 39.2°F (4°C) with warmer temperatures in the later months. Rain is somewhat common with 2 to 7 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 2 to 7 days of precipitation per month. June – August is the busiest season for tourism in Big Sky, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 79.3°F (26.3°C) and 37.1°F (2.8°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 2 to 3 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is far too cold this time of year in Big Sky to be enjoyable for warm weather travelers. The average high during this season is between 43°F (6.1°C) and 30.2°F (-1°C). On average, it rains or snows a smalll amount: 0 to 2 times per month. These times of year are the slowest with tourists.


Best Times to Travelthe United States › Big Sky, MT, US