Boise · January
Run in the midday.
Cold: average high 40°F, low 25°F. Layering becomes the workout. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
Avg high / low
40° / 25°F
Humidity
73%
Rain days
12/mo
Wind
11 mph
What January feels like in Boise
Sunrise
09:12
Mid-month average
Sunset
18:35
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
Midday
Often the warmest few hours of a cold day. If you can only run once, midday gives you the most temperate window.
Evening
Cold drops back in fast after sunset. Tight window — done before headlamp territory.
What to wear running in Boise in January
The kit for January in Boise: cold-weather layers, gloves, and ear coverage on most mornings.
January vs the surrounding months
vs December
+1° avg high
-2 rain days
Boise in December →
January
40°F avg high
12 rain days
Best: midday
vs February
-5° avg high
0 rain days
Boise in February →
Frequently Asked Questions
What is the best time of day to run in Boise in January?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in Boise in January?+
Average high 40°F, average low 25°F.
How does January compare to surrounding months in Boise?+
Compared to December (avg high 39°F), January is warmer. Compared to February (avg high 45°F), January is cooler.
Does it rain often in Boise in January?+
Expect about 12 measurable rain days in January, on average.