The best times to visit Helena for ideal weather are

June 11th to October 7th

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



Other Helena Travel Info

Weather in Helena


Average temperatures in Helena vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 43rd 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 Helena, 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 91.6°F (33.1°C) with temperatures rarely dropping below 55°F (12.8°C) at night.

Helena Temperatures (Fahrenheit)


Helena 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.

Helena Perceived Temperature (F)


Helena Perceived Temperature (C)



Average Helena 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 36.7 24.8 14.1
Feb 39.6 27.7 17.5
Mar 52.4 37.7 25.2
Apr 59.3 43.5 30.2
May 68.5 53.1 39.2
Jun 78 62 47
Jul 90.2 72 54.6
Aug 87.8 69.1 52.6
Sep 78.1 59.6 44.1
Oct 62 46.3 33.7
Nov 46.2 33.2 22.9
Dec 34.1 22.8 12.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 2.6 -4 -9.9
Feb 4.2 -2.4 -8.1
Mar 11.3 3.2 -3.8
Apr 15.2 6.4 -1
May 20.3 11.7 4
Jun 25.6 16.7 8.3
Jul 32.3 22.2 12.6
Aug 31 20.6 11.4
Sep 25.6 15.3 6.7
Oct 16.7 7.9 0.9
Nov 7.9 0.7 -5.1
Dec 1.2 -5.1 -10.9



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Helena are January, October, 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 to mid February. For example, on the week of February 12th 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 Helena? Weather stations report large amounts of snow likely to be deepest around March, especially close to early November. The best time to ski (if at all) in Helena is often around around November 5th 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 Helena.

Days with precipitation

Snow on the Ground

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

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 6% 3.3 0.7
Feb 7% 2.9 0.6
Mar 6% 3.4 0.5
Apr 9% 1.8 0.7
May 19% 3.1 1.9
Jun 17% 0 1.8
Jul 7% 0 0.9
Aug 12% 0 1.4
Sep 9% 0 1
Oct 6% 1.6 0.6
Nov 9% 2.8 0.8
Dec 6% 2.5 0.7

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 6 8.4 1.8
Feb 7 7.4 1.5
Mar 6 8.6 1.3
Apr 9 4.6 1.8
May 19 7.9 4.8
Jun 17 0 4.6
Jul 7 0 2.3
Aug 12 0 3.6
Sep 9 0 2.5
Oct 6 4.1 1.5
Nov 9 7.1 2
Dec 6 6.4 1.8


Humidity and Wind

Helena has some comfortably humid months, and dry months in the opposite season. The least humid month is July (28% relative humidity), and the most humid month is December (56.8%).

Wind in Helena is usually calm. The windiest month is April, followed by May and June. April’s average wind speed of around 7.4 knots (8.5 MPH or 13.6 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late April where average top sustained speeds reach 18.3 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

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 5 Light breeze 13.1 Significant breeze
Feb 5.4 Light breeze 13.5 Significant breeze
Mar 6.4 Light breeze 16.1 Significant breeze
Apr 7.4 Gentle breeze 17.3 Strong breeze
May 6.7 Light breeze 16.1 Significant breeze
Jun 6.4 Light breeze 16.2 Significant breeze
Jul 5.7 Light breeze 15.7 Significant breeze
Aug 5.2 Light breeze 15.4 Significant breeze
Sep 4.8 Light breeze 13.5 Significant breeze
Oct 5.2 Light breeze 13.8 Significant breeze
Nov 5.2 Light breeze 13.4 Significant breeze
Dec 4.6 Light breeze 12.3 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 53.5%
Feb 52.8%
Mar 41.5%
Apr 37%
May 38.8%
Jun 37.3%
Jul 28%
Aug 30.1%
Sep 34.6%
Oct 45.1%
Nov 49.5%
Dec 56.8%


Is it Safe to Travel to Helena?

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 Helena, 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 Helena 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 somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 46.8 in December means 46.8% of the tourists vs. July.



Overall Helena Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 73.5°F (23.1°C) and 40.6°F (4.8°C) with warmer temperatures in the later months. Rain is rare with 2 to 6 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 the most precipitation with 2 to 5 days of precipitation per month. June – August is the busiest season for tourism in Helena, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 79.2°F (26.2°C) and 39.4°F (4.1°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 Helena to be enjoyable for warm weather travelers. The average high during this season is between 44.8°F (7.1°C) and 32°F (0°C). On average, it rains or snows a smalll amount: consistently 2 times per month. These times of year are the slowest with tourists.


Best Times to Travelthe United States › Helena, MT, US