The best times to visit Boise for ideal weather are

April 30th to July 1st

or

August 20th 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 Boise Travel Info

Weather in Boise

Temperature

Average temperatures in Boise 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 40th 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 Boise, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 97.3°F (36.3°C) with temperatures rarely dropping below 63.7°F (17.6°C) at night.

Boise Temperatures (Fahrenheit)

Key
High
Average
Low

Boise Temperatures (Celsius)

Key
High
Average
Low

“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.

Boise Perceived Temperature (F)

Key
High
Average
Low

Boise Perceived Temperature (C)

Key
High
Average
Low

 

Average Boise 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 38.7 30 22.4
Feb 48.3 37.7 28.6
Mar 58 44.9 33.5
Apr 64.5 50.1 36.7
May 74.7 59.7 44.9
Jun 84.7 68.7 52.9
Jul 96.3 79.3 62
Aug 93.5 76.9 60.6
Sep 84.2 67.6 52.9
Oct 68.2 53.6 42
Nov 51.2 40.1 30.9
Dec 40.7 31.8 23.9

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 3.7 -1.1 -5.3
Feb 9.1 3.2 -1.9
Mar 14.4 7.2 0.8
Apr 18.1 10.1 2.6
May 23.7 15.4 7.2
Jun 29.3 20.4 11.6
Jul 35.7 26.3 16.7
Aug 34.2 24.9 15.9
Sep 29 19.8 11.6
Oct 20.1 12 5.6
Nov 10.7 4.5 -0.6
Dec 4.8 -0.1 -4.5

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Boise are July, August, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early July. For example, on the week of July 2nd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 2 days of significant precipitation the week of December 17th.

When can you find snow in Boise? Weather stations report a good amount of seasonal snow likely to be deepest around November, especially close to mid November. The best time to ski (if at all) in Boise is often around around November 19th 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 Boise.

Key
Days with precipitation

Snow on the Ground

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

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 12% 2.2 1.2
Feb 13% 2 1
Mar 16% 1.5 1.3
Apr 11% 0 1.2
May 10% 0 1.1
Jun 8% 0 0.7
Jul 1% 0 0.2
Aug 2% 0 0.4
Sep 4% 0 0.5
Oct 11% 0 1
Nov 12% 2.8 1.3
Dec 19% 2.3 1.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 12 5.6 3
Feb 13 5.1 2.5
Mar 16 3.8 3.3
Apr 11 0 3
May 10 0 2.8
Jun 8 0 1.8
Jul 1 0 0.5
Aug 2 0 1
Sep 4 0 1.3
Oct 11 0 2.5
Nov 12 7.1 3.3
Dec 19 5.8 4.6

 

Humidity and Wind

Boise has some humid months, with some very dry months. The least humid month is July (18.5% relative humidity), and the most humid month is January (66.2%).

Wind in Boise is usually calm. The windiest month is April, followed by March and May. April’s average wind speed of around 7.3 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 early to mid April where average top sustained speeds reach 17.1 knots, which is considered a fresh breeze.

Relative Humidity (%)

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

Key
Avg. Relative Humidity

Wind

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

Key
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 4.9 Light breeze 11.1 Significant breeze
Feb 6 Light breeze 13.2 Significant breeze
Mar 7.1 Gentle breeze 15.3 Significant breeze
Apr 7.3 Gentle breeze 16.2 Significant breeze
May 7.1 Gentle breeze 15.6 Significant breeze
Jun 6.5 Light breeze 14.7 Significant breeze
Jul 5.9 Light breeze 13.6 Significant breeze
Aug 5.7 Light breeze 13.8 Significant breeze
Sep 5.6 Light breeze 12.8 Significant breeze
Oct 5.5 Light breeze 12.7 Significant breeze
Nov 5.5 Light breeze 12.3 Significant breeze
Dec 5.8 Light breeze 12.5 Significant breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 66.2%
Feb 56%
Mar 42.9%
Apr 35.1%
May 32%
Jun 27.8%
Jul 18.5%
Aug 20%
Sep 25.5%
Oct 41.3%
Nov 56.3%
Dec 64.8%

 

Is it Safe to Travel to Boise?

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 Boise, ID, US is July, followed by August and May. 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 Boise in September. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
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 36.1 in September means 36.1% of the tourists vs. July.

 

 

Overall Boise Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 79.3°F (26.3°C) and 51.3°F (10.7°C) with warmer temperatures in the later months. Rain is rare with 3 to 5 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 least precipitation with 0 to 2 days of precipitation per month. June – August is the busiest season for tourism in Boise, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 86.6°F (30.3°C) and 45°F (7.2°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 4 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is far too cold this time of year in Boise to be enjoyable for warm weather travelers. The average high during this season is between 51.3°F (10.7°C) and 36.8°F (2.7°C). On average, it rains or snows a fair amount: 4 to 6 times per month. These times of year are fairly slow with tourists.

 

Best Times to Travelthe United States › Boise, ID, US