Idaho Falls, ID Climate & Monthly Averages
The climate of Idaho Falls
Idaho Falls has a semi-arid climate, marked by big day-to-night temperature swings and modest rainfall. Average daytime highs range from about 31°F (-1°C) in January to around 90°F (32°C) in July, and the city records roughly 84 days of measurable precipitation a year.
Climate quick facts
- Hottest month: July - highs near 90°F (32°C)
- Coldest month: January - highs near 31°F (-1°C)
- Record high: 103°F (39°C) · Record low: -21°F (-29°C) (2015–2024)
- Wettest month: May (10 rainy days) · Sunniest: July (14.2 h sun/day)
- Climate type: semi-arid - big day-to-night temperature swings and modest rainfall
- Snow: about 30 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 90°F (32°C) and overnight lows stay near 60°F (16°C). The coolest month is January, with typical highs of 31°F (-1°C) and lows around 15°F (-9°C). Based on 2015–2024 weather data, temperatures have reached as high as 103°F (39°C) and dropped as low as -21°F (-29°C).
Rain, sun and snow
May is usually the wettest month. It brings about 1.9 inches (48 mm) of rain over 10 days, while July is the driest. July brings the most sunshine, averaging 14.2 hours of sun a day. Snow falls on about 30 days in a typical year, mostly from October through April.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 31° | 15° | 9 | 1.2 in | 6.1 h/day | 77% |
| February | 36° | 19° | 9 | 1.2 in | 7.4 h/day | 70% |
| March | 47° | 26° | 9 | 1.5 in | 9.1 h/day | 62% |
| April | 57° | 33° | 9 | 1.3 in | 10.6 h/day | 51% |
| May | 67° | 42° | 10 | 1.9 in | 12.1 h/day | 49% |
| June | 80° | 52° | 5 | 0.8 in | 13.7 h/day | 39% |
| July | 90° | 60° | 1 | 0.2 in | 14.2 h/day | 29% |
| August | 86° | 58° | 3 | 0.5 in | 12.4 h/day | 34% |
| September | 76° | 49° | 5 | 1.2 in | 11.0 h/day | 42% |
| October | 59° | 37° | 7 | 1.4 in | 9.1 h/day | 56% |
| November | 43° | 25° | 8 | 1.2 in | 7.1 h/day | 67% |
| December | 32° | 17° | 9 | 1.4 in | 5.5 h/day | 74% |
Idaho Falls month by month
Idaho Falls weather in January
January brings highs around 31°F (-1°C), lows near 15°F (-9°C), about 9 wet days and roughly 7 snowy days - typically the coldest month of the year in Idaho Falls.
Idaho Falls weather in February
February brings highs around 36°F (2°C), lows near 19°F (-7°C), about 9 wet days and roughly 5 snowy days.
Idaho Falls weather in March
March brings highs around 47°F (8°C), lows near 26°F (-3°C), about 9 wet days and roughly 4 snowy days.
Idaho Falls weather in April
April brings highs around 57°F (14°C), lows near 33°F (0°C), about 9 wet days and roughly 2 snowy days.
Idaho Falls weather in May
May brings highs around 67°F (20°C), lows near 42°F (5°C), about 10 wet days - typically the wettest month of the year in Idaho Falls.
Idaho Falls weather in June
June brings highs around 80°F (27°C), lows near 52°F (11°C), about 5 wet days.
Idaho Falls weather in July
July brings highs around 90°F (32°C), lows near 60°F (16°C), about 1 wet days - typically the hottest month and the driest month and the sunniest month of the year in Idaho Falls.
Idaho Falls weather in August
August brings highs around 86°F (30°C), lows near 58°F (14°C), about 3 wet days.
Idaho Falls weather in September
September brings highs around 76°F (24°C), lows near 49°F (10°C), about 5 wet days.
Idaho Falls weather in October
October brings highs around 59°F (15°C), lows near 37°F (3°C), about 7 wet days and roughly 1 snowy days.
Idaho Falls weather in November
November brings highs around 43°F (6°C), lows near 25°F (-4°C), about 8 wet days and roughly 4 snowy days.
Idaho Falls weather in December
December brings highs around 32°F (0°C), lows near 17°F (-8°C), about 9 wet days and roughly 7 snowy days.
Seasons in Idaho Falls
Spring (March through May)
Spring in Idaho Falls stays on the cool side of mild, with daytime highs averaging 57°F (14°C) and nights around 34°F (1°C); expect showers on roughly 28 days across the season, plus around 6 snowy days.
Summer (June through August)
Summer in Idaho Falls brings hot afternoons, with daytime highs averaging 85°F (30°C) and nights around 57°F (14°C); rain falls on about 9 days over the three months.
Fall (September through November)
Fall in Idaho Falls is crisp but comfortable, with daytime highs averaging 59°F (15°C) and nights around 37°F (3°C); expect showers on roughly 20 days across the season, plus around 5 snowy days.
Winter (December through February)
Winter in Idaho Falls is bitterly cold, with daytime highs averaging 33°F (1°C) and nights around 17°F (-8°C); expect showers on roughly 27 days across the season, plus around 19 snowy days. Wind makes those temperatures feel harsher than they sound - pair the forecast winds with the wind speed converter to judge conditions on exposed skin.
Climate questions, answered
What is the average temperature in Idaho Falls?
Is Idaho Falls hot in summer?
Is Idaho Falls cold in winter?
How many rainy days does Idaho Falls get in a year?
Best time to visit Idaho Falls
The best time to visit Idaho Falls is generally May to June and September to October, when temperatures are at their most comfortable before or after the peak heat. Daytime temperatures in that window typically sit near 71°F (21°C).
Pack for Idaho Falls with lightweight, breathable clothing and strong sun protection for the hot months; a heavy insulated coat, hat and gloves for winter. Evenings can feel noticeably cooler than afternoons - July nights average 60°F (16°C).
Idaho Falls temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.