Weather in Boise in January 2026
- January is usually the coldest month of the year in Boise;
- January is usually the wettest month of the year in Boise;
Average weather
Average temperature in Boise in January
Going from a maximum of +12°C during the day to a minimum of -12°C during the night, the temperature in January averages around +5°C.
The average maximum temperature goes down 33% by the end of the month, compared with the beginning of the month, from +4°C to -4°C.
Is Boise warm or cold in January?
Boise is typically cool in January.
Maximum temperatures go up compared to the previous month from +4°C to +4°C. The minimum temperature also goes up from -3°C to -3°C.
Pack a sweater and a jacket as there will be cooler temperatures.
January is the coldest month in Boise, here is the comparison with other months:
Climate in Boise in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +4°C | +4°C | +8°C | ||||
| Min. temperature | ||||||
| -32°C | -25°C | -25°C | ||||
| Max. temperature | ||||||
| +17°C | +18°C | +20°C | ||||
| Rainfall | ||||||
| 41 mm | 36 mm | 33 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 75% | 76% | 68% | ||||
| Air pressure | ||||||
| 1021 HPa | 1022 HPa | 1019 HPa | ||||
| Sunny days | ||||||
| 6 | 6 | 7 | ||||
| Cloudy days | ||||||
| 10 | 11 | 8 | ||||
| Rainy days | ||||||
| 8 | 7 | 9 | ||||
| Snowy days | ||||||
| 7 | 7 | 4 | ||||
January weather is still as ok as in December. The temperature levels stay the same in the area of +4°C for average maximum temperature during the day. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 41 mm to 36 mm. Humidity rises from 75% to 76%. The average wind speed doesn’t change much during January, staying around 2 m/s. The amount of sunny days stay about the same, averaging 6 sunny days during the month.
February brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Boise is gradually increasing during January, going from 2 m/s to 4 m/s over the course of the month.
Rain
Snow
January is one of the snowiest months in Boise.
Here’s how January is compared with other months in the amount of snow, total mm:
How was the weather last January in Boise?
Climate Change over Years
The climate in Boise in January has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+16°C) and the highest in 2012 (+20°C). The driest year was 2002 with only 219 mm of rainfall, and the wettest year was 2024 with 653 mm.
FAQ
Is January a good time to visit Boise?
Can you sunbathe in Boise in January?
Is Boise rainy in January?
Is it sunny in Boise in January?
Other cities in USA
Monthly weather in Boise
Source of the data
For this page, we’ve looked at the typical weather in Boise, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
