Idaho Falls, ID Weather
Idaho Falls hourly forecast: next 24 hours
Today's high of 75°F (24°C) is right in line with the typical September high of 76°F (24°C).
Current conditions in detail
Idaho Falls weather tomorrow (Wednesday, September 16)
Tomorrow in Idaho Falls looks sunny, with a high of 84° and an overnight low of 48°. Rain is unlikely (2% chance). Winds top out near 11 mph, and the UV index reaches 6 (moderate).
Idaho Falls 14-day forecast
About the weather in Idaho Falls
Idaho Falls spends most of the year cold. July, the warmest month, averages 90°F (32°C) by day - a figure many cities in our dataset pass in early spring - while January holds at 31°F (-1°C) with 84 wet days a year across the whole calendar.
Idaho Falls weather: quick facts
- Hottest month: July - highs near 90°F (32°C)
- Coldest month: January - highs near 31°F (-1°C)
- Decade extremes (2015-2024): 103°F (39°C) high · -21°F (-29°C) low
- Wettest month: May (10 rainy days) · Sunniest: July (14.2 h sun/day)
- Climate type: semi-arid
- Annual swing: 30°C between the average warmest and coolest month · day to night: 12°C
- Snow: about 30 days a year
- Months averaging 30°C or hotter: 2
- Average humidity: 54%
Temperatures through the year
2 months average under 20 mm of rain, the longest unbroken stretch running July through August. At its warmest, in July, Idaho Falls runs to 90°F (32°C) in the afternoon and back to 60°F (16°C) by dawn. January sits at the other end of the year: 31°F (-1°C) by day, 15°F (-9°C) at night. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 103°F (39°C) and the lowest daily minimum -21°F (-29°C). Overnight lows average at or below freezing for 5 months, November through March.
Rain, sun and snow
Between the average July and the average January lie 30°C, a wider spread than 96% of the 3496 cities in our dataset. Sunshine averages 9.9 hours a day over the year, peaking in July at 14.2 hours. Days and nights are about 12°C apart on average - wider than 93% of the 3496 cities in our dataset.
Season by season
Spring (March through May)
Through spring, Idaho Falls is crisp but comfortable: 57°F (14°C) by day, 34°F (1°C) after dark, and expect showers on roughly 28 days across the season, plus about 6 snowy days. Daylight is generous - around 10.6 hours of sun a day.
Summer (June through August)
Summer runs hot here - highs near 85°F (30°C), nights near 57°F (14°C), and rain comes on about 9 days over the three months. Daylight is generous - around 13.4 hours of sun a day.
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 about 5 snowy days.
Winter (December through February)
Winter runs to hard cold here - highs near 33°F (1°C), nights near 17°F (-8°C), and expect showers on roughly 27 days across the season, plus about 19 snowy days. Wind sharpens cold like this considerably; pair the forecast winds with the wind speed converter to judge exposed conditions.
Average temperatures in Idaho Falls by month
| 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% |