Here is the year-round weather information for Idaho, a state rich in nature located in the U.S. Northwest.

Idaho is known for its vast mountainous terrain, rivers, and outdoor recreational activities, and it experiences distinct changes across the four seasons.

If you are planning a trip or a move, be sure to check the weather information for Idaho.

Climate Characteristics of Idaho

Idaho experiences both semi-arid climate and mountain climate depending on the region.

• Plain Areas (Boise, Twin Falls): Summers are hot and dry, while winters are relatively mild.
• Mountain Areas (Coeur d'Alene, Sun Valley): Summers are cool, and winters receive significant snowfall.
• Precipitation: There is low precipitation throughout the year, with most rain falling in spring and early summer.

Idaho enjoys a lot of sunshine, resulting in many clear days, and winter is a great time for outdoor activities like skiing.

Average Monthly Temperatures (Based on Boise)

January

Average High: 36°F(2°C)
Average Low: 23°F(-5°C)
Winter in Idaho has many snowy days, so prepare warm clothing for outdoor activities.

February

Average High: 43°F(6°C)
Average Low: 26°F(-3°C)
Winter continues, but there are days when the sun shines warmly during the day.

March

Average High: 54°F(12°C)
Average Low: 33°F(1°C)
Spring begins, and the weather gradually warms up, making it a great time for activities like hiking.

April

Average High: 61°F(16°C)
Average Low: 38°F(3°C)
Spring brings more clear weather, making it a wonderful season to enjoy nature outdoors.

May

Average High: 70°F(21°C)
Average Low: 46°F(8°C)
May marks the full bloom of spring, with outdoor activities flourishing along rivers and mountains.

June

Average High: 80°F(27°C)
Average Low: 53°F(12°C)
Warm weather continues into early summer, making it suitable for recreational activities and camping.

July

Average High: 91°F(33°C)
Average Low: 60°F(16°C)
July is the hottest month in Idaho, with hot days but cool nights.

August

Average High: 90°F(32°C)
Average Low: 58°F(14°C)
Summer continues, and you can enjoy water recreation in rivers or lakes even in the heat.

September

Average High: 78°F(26°C)
Average Low: 48°F(9°C)
As fall begins, temperatures cool down, and the leaves start to change color.

October

Average High: 63°F(17°C)
Average Low: 37°F(3°C)
Clear and cool autumn weather continues, and the mountain scenery reaches its peak.

November

Average High: 47°F(8°C)
Average Low: 30°F(-1°C)
Temperatures gradually drop, giving a sense of early winter.

December

Average High: 37°F(3°C)
Average Low: 23°F(-5°C)
Winter returns with snowfall, making it a great time for winter sports like skiing.

Travel Tips for Idaho

1. Outdoor Recreation: In summer, there are many places for camping, hiking, and fishing, while in winter, skiing and snowboarding are popular.
2. Clothing Preparation: In mountainous areas, the temperature difference can be significant, so layered clothing suitable for the season is essential.
3. Recommended Attractions: Be sure to visit natural attractions like Shoshone Falls and Craters of the Moon.
4. Precipitation Preparedness: Prepare raincoats and waterproof shoes for spring and early summer.

Experience the unique landscapes and adventures that can only be found here.

Thank you.