January weather forecast
Boise, ID

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The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho

Weather in January

Boise, Idaho, starts the year quite chilly. Winter is at its prime, the sky is mostly cloudy which makes days shorter with just about nine hours of daylight. The inclement weather can make visibility slightly challenging which being at 5 miles due to icy or foggy conditions while UV index remains quite low at this time. The most considerable weather feature is the high level of snowfall, with up to 6.54" (166mm) typically recorded during the month. January stands as a quiet month, with low wind speed and comparatively high atmospheric pressure aiding in temperature regulation.

Temperature

January experiences an average high-temperature of a still cold 35.2°F (1.8°C), barely different from December's 34.7°F (1.5°C). During the nights in January, the temperature averages to a subzero cold 23.4°F (-4.8°C).

Humidity

With an average relative humidity of 80%, January is the most humid month in Boise.

Rainfall

In Boise, in January, it is raining for 10.5 days, with typically 2.05" (52mm) of accumulated precipitation. In Boise, during the entire year, the rain falls for 116.8 days and collects up to 15.08" (383mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Boise. In Boise, during January, snow falls for 8.2 days and regularly aggregates up to 6.54" (166mm) of snow. Throughout the year, there are 31.4 snowfall days, and 21.3" (541mm) of snow is accumulated.

Daylight

In January, the average length of the day in Boise is 9h and 23min.
On the first day of January, sunrise is at 8:18 am and sunset at 5:18 pm. On the last day of the month, sunrise is at 8:02 am and sunset at 5:54 pm MST.

Sunshine

In January, the average sunshine is 5.7h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Boise. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: A daily maximum UV index of 2 in January translates into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
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Frequently asked questions

How cold is it in Boise in January?

Boise in January has an average high-temperature of 35.2°F (1.8°C) and an average low-temperature of 23.4°F (-4.8°C).

What is the most humid month in Boise?

With an average relative humidity of 80%, January is the most humid month in Boise.

What is the average humidity in January in Boise?

In January, the average relative humidity in Boise, Idaho, is 80%.

How much does it rain in Boise in January?

In January, in Boise, the rain falls for 10.5 days. Throughout January, 2.05" (52mm) of precipitation is accumulated.

How many days does it snow in January in Boise?

In Boise, Idaho, in January, snow falls for 8.2 days, with typically accumulated 6.54" (166mm) of snow.

How many hours of daylight does Boise have in January?

The average day length in January is 9h and 23min.

What time are sunrise and sunset in January in Boise?

In January, on the first day of the month, sunrise is at 8:18 am and sunset at 5:18 pm. On the last day of the month, in Boise, Idaho, sunrise is at 8:02 am and sunset at 5:54 pm MST.

How many hours of sunshine does Boise have in January?

In January, the average sunshine duration in Boise is 5.7h.

What is the month with the lowest UV index in Boise?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in January in Boise?

In Boise, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
34.7°F 1.5°C
35.2°F 1.8°C
39.9°F 4.4°C
Average low temperature
23.2°F -4.9°C
23.4°F -4.8°C
27.7°F -2.4°C
Average pressure
30.22" 768mmHg
30.25" 768mmHg
30.13" 765mmHg
Average wind speed
5.8mph 9.3km/h
5.2mph 8.4km/h
6.1mph 9.8km/h
Average max. wind speed
6.3mph 10.1km/h
5.8mph 9.3km/h
6.6mph 10.6km/h
Average wind speed gusts
10.6mph 17.1km/h
9.6mph 15.4km/h
10.5mph 16.9km/h
Average humidity
78%
80%
76%
Average rainfall
2.09" 53mm
2.05" 52mm
1.93" 49mm
Average rainfall days
10.4
10.5
11.7
Average snowfall
6.65" 169mm
6.54" 166mm
4.8" 122mm
Average snowfall days
9.2
8.2
6.8
Average daylight
9h 0min
9h 2min
10h 3min
Average sunshine
5h 3min
5h 4min
7h 3min
Average sunshine days
15.2
15.8
12.7
Average UV index
2
2
2
Average cloud cover
42%
40%
40%
Average visibility
6mi 9.7km
5mi 8km
6mi 9.7km

Average temperature in January
Boise, ID

Average temperature in January - Boise, ID
  • Average high temperature in January: 35.2°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).

  • Average low temperature in January: 23.4°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).

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Average pressure in January
Boise, ID

Average pressure in January - Boise, ID
  • Average pressure in January: 30.25"Hg

The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in January
Boise, ID

Average wind speed in January - Boise, ID
  • Average wind speed in January: 5.2mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

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Average humidity in January
Boise, ID

Average humidity in January - Boise, ID
  • Average humidity in January: 80%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in January
Boise, ID

Average rainfall in January - Boise, ID
  • Average rainfall in January: 2.05"

The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days in January
Boise, ID

Average rainfall days in January - Boise, ID
  • Average rainfall days in January: 10.5 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).

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Average snowfall in January
Boise, ID

Average snowfall in January - Boise, ID
  • Average snowfall in January: 6.54"

The month with the highest snowfall is December (6.65").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Boise, ID

Average snowfall days in January - Boise, ID
  • Average snowfall days in January: 8.2 days

The month with the highest number of snowfall days is December (9.2 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Boise, ID

Average daylight in January / Average sunshine in January - Boise, ID
  • Average daylight in January: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in January: 5h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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Average sunshine days in January
Boise, ID

Average sunshine days in January - Boise, ID
  • Average sunshine days in January: 15.8 days

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

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Average UV index in January
Boise, ID

Average UV index in January - Boise, ID
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Boise, ID

Average cloud cover in January - Boise, ID
  • Average cloud cover in January: 40

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in January
Boise, ID

Average visibility in January - Boise, ID
  • Average visibility in January: 5mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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Boise, Idaho, USA

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