Flash Flood Watch
* WHAT...Flash flooding and debris flows caused by excessive rainfall
continue to be possible over the Big Rock burn scar.
* WHERE...The Big Rock burn scar near Heise.
* WHEN...From noon MDT today through this evening.
* IMPACTS...Heavy rainfall over the Big Rock burn scar is …
Red Flag Warning
...CRITICAL FIRE WEATHER CONDITIONS THURSDAY DUE TO SCATTERED
THUNDERSTORMS...
The National Weather Service in Pocatello has issued a Red Flag
Warning for scattered thunderstorms, which is in effect from noon
to 9 PM MDT Thursday.
* AFFECTED AREA...Fire Weather Zone 410 Upper S…
Red Flag Warning
...CRITICAL FIRE WEATHER CONDITIONS THURSDAY DUE TO SCATTERED
THUNDERSTORMS...
* AFFECTED AREA...Fire Weather Zone 410 Upper Snake River
Valley/Idaho Falls BLM, Fire Weather Zone 411 Centennial
Mountains and Snake River Range/Targhee NF, Fire Weather Zone
413 Caribou Range/Carib…
Tomorrow in Idaho Falls looks
patchy rain nearby, with a high of 75°
and an overnight low of 55°.
There is a 74% chance of rain - plan accordingly.
Winds top out near 18 mph,
and the UV index reaches 6 (high).
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.
Idaho Falls weather: 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.
Season by season
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.
Average temperatures in Idaho Falls by month
Monthly averages for Idaho Falls based on 2015–2024 weather data.
July is the hottest month in Idaho Falls, with average highs of 90°F (32°C) and overnight lows near 60°F (16°C). In the past decade the temperature has peaked at 103°F (39°C).
What is the coldest month in Idaho Falls?
January is the coldest month, with highs averaging 31°F (-1°C) and lows around 15°F (-9°C). The lowest reading in recent years was -21°F (-29°C).
What is the rainiest month in Idaho Falls?
May is typically the wettest month, averaging 1.9 inches (48 mm) of precipitation across about 10 days. July is usually the driest.
Does it snow in Idaho Falls?
Yes. Idaho Falls averages about 30 days of snowfall a year, concentrated October through April.
What is the 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).
How sunny is Idaho Falls?
Idaho Falls averages 9.9 hours of sunshine per day across the year. July is the sunniest month at about 14.2 hours of sun a day.
Is Idaho Falls humid?
Relative humidity in Idaho Falls averages about 54% over the year, which feels dry. The most comfortable months tend to fall in the drier part of the year.