Boise Weather in January
In Boise, January brings low daytime temperatures around 4°C (39°F), with nights cooling to -5°C (23°F). Some snow/rainfall is to be expected.
Rainfall in Boise in January
Climate statistics over the past 30 years suggest around 11 days of snow/rain, with 34 mm (1.3 in) average for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Boise in January
In January, expect low temperatures in Boise, with highs of 4°C (39°F) and lows of -5°C (23°F) at night. January is part of winter. Cold conditions tend to persist from morning through evening, so be prepared for winter weather. At -5°C (23°F) overnight, frost and ice are likely outside. Indoors, consider packing an extra blanket if you're unsure about the heating. Prepare for the coldest month of the year by packing warm and cozy winter cloths.
Sunshine in Boise in January
The area enjoys a balanced 111 hours of sunlight, ensuring it's neither too overcast nor too sunny.If you prefer dry days with pleasant temperatures, January may not be the ideal month to visit Boise. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Boise Temperature in January
Min Temperature
-5°C (23°F)
Max Temperature
4°C (39°F)
Chance of Rain
36%
Precipitation
34 mm (1.3 in)
Rainy days
11 days
Humidity
75%
Sunshine
111 hours
Percentage Sunshine
38%
Daily Historical Temperatures
51-year average (1976-2026)
Based on our historical records, temperatures in Boise typically stay consistent throughout January, with daily highs averaging around 4°C (39°F). Nights are very cold, with lows typically ranging from -6°C (21°F) to -3°C (27°F).
Average temperatures in January
Daily Historical Precipitation
51-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for Boise in January
Browse day-by-day weather records for Boise spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Boise historical weather extremes in January
Our historical data for Boise spans 1976 to 2025, revealing these weather extremes.
- The warmest day in January was on January 31, 2024, with a maximum of 18°C (64°F).
Best Places in the United States of America in January
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in January →
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What to Wear in Boise in January
Dress warmly and in layers for your trip to Boise in January. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Light rain is possible, so consider bringing a small umbrella or rain jacket. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Boise in January
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boise's climate page.
Temperature Rainfall Sunshine Humidity
See the full Boise climate overview or explore weather in the United States of America.
