Idaho Falls Climate by Month
Idaho Falls, Idaho, United States
Hot summers and freezing winters, with little rain.
Hot summers and freezing winters, with little rain: that's Idaho Falls's climate in short. Afternoon highs range from 32°F (0°C) in January to 88°F (31°C) in July, and January nights average 13°F (-11°C). It gets only 11 in (275 mm) of rain a year.
- Warmest month
- 88°F(31°C)
- Average high, July
- Coldest nights
- 13°F(-11°C)
- Average low, January
- Rain per year
- 11 in(275 mm)
- No clear rainy season
- Humidity
- 59%
- Sunniest: July
Best and worst months in Idaho Falls
Best for weatherThe most comfortable weather comes in June and September, with highs around 77°F (25°C) and about 1.0 in (27 mm) of rain a month.
Least pleasantDecember is the least pleasant month: it's the coldest, with highs of only 33°F (1°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Idaho Falls weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 32°F(0°C) | 13°F(-11°C) | 0.9 in(22 mm) | 72% | 1.5 |
| FebFebruary | 38°F(3°C) | 16°F(-9°C) | 0.8 in(20 mm) | 80% | 2.4 |
| MarMarch | 49°F(10°C) | 25°F(-4°C) | 0.8 in(20 mm) | 67% | 4.0 |
| AprApril | 58°F(15°C) | 31°F(-1°C) | 1.1 in(27 mm) | 50% | 4.9 |
| MayMay | 68°F(20°C) | 38°F(4°C) | 1.4 in(36 mm) | 50% | 6.1 |
| JunJuneBest | 78°F(25°C) | 45°F(7°C) | 1.3 in(32 mm) | 49% | 7.0 |
| JulJuly | 88°F(31°C) | 51°F(10°C) | 0.4 in(10 mm) | 41% | 7.4 |
| AugAugust | 87°F(31°C) | 49°F(9°C) | 0.6 in(15 mm) | 39% | 6.3 |
| SepSeptemberBest | 76°F(25°C) | 40°F(5°C) | 0.8 in(21 mm) | 48% | 4.8 |
| OctOctober | 61°F(16°C) | 31°F(-1°C) | 0.9 in(24 mm) | 57% | 3.1 |
| NovNovember | 44°F(7°C) | 21°F(-6°C) | 0.9 in(23 mm) | 64% | 1.9 |
| DecDecember | 33°F(1°C) | 14°F(-10°C) | 1.0 in(25 mm) | 94% | 1.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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