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January Weather in Boise City, United States

Last updated: June 24, 2025

In Boise City, United States, the average temperature in January hovers around 2°C (36°F). Temperatures can swing dramatically, with a minimum of -19°C (-2°F) and a maximum reaching up to 25°C (77°F). Expect a precipitation amount of approximately 16 mm (0.6 in), typically spread over 3 days, and an average humidity of 73%.

January Temperature in Boise City

In January in Boise City, the average temperature is 2°C (36°F), with maximums reaching 25°C (77°F) and minimums plunging as low as -19°C (-2°F). It's essential to pack for a wide range of temperatures if you're planning to travel during this time.

January Weather in Boise City: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Boise City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boise City, January typically has an average temperature of 2°C (36°F), with highs reaching up to 25°C (77°F) and lows dropping to around -19°C (-2°F).
JanFebMarAprMayJunJulAugSepOctNovDec363748556475797671564739
Data source: Temperature data for Boise City generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Boise City

In Boise City in January, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

January Precipitation Trends in Boise City

The chart displays monthly precipitation patterns in Boise City, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Boise City, January typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec16113641603744553234715
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Boise City

In Boise City in January, humidity is 73%. With an average temperature of 2°C (36°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less enjoyable and necessitating warm layers to stay comfortable while traveling.

January Average Humidity in Boise City

This chart illustrates the average monthly humidity levels in Boise City, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Boise City is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%76%64%61%71%75%75%80%80%78%76%78%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Boise City

In Boise City in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Boise City for better planning.

Maximum UV Index Levels in Boise City for January

The chart shows the monthly maximum UV Index (UVI) for Boise City in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Boise City typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Boise City January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Boise City Compares to Other Months

Weather in Boise City varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Boise City, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Boise City, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)16 mm (0.6 inches)73%moderate
February Weather3°C (37°F)11 mm (0.4 inches)76%high
March Weather9°C (49°F)36 mm (1.4 inches)64%very high
April Weather13°C (55°F)41 mm (1.6 inches)61%very high
May Weather18°C (64°F)60 mm (2.4 inches)71%extreme
June Weather24°C (76°F)37 mm (1.5 inches)75%extreme
July Weather26°C (79°F)44 mm (1.7 inches)75%extreme
August Weather25°C (77°F)55 mm (2.2 inches)80%extreme
September Weather22°C (71°F)32 mm (1.3 inches)80%very high
October Weather13°C (56°F)34 mm (1.3 inches)78%high
November Weather8°C (47°F)7 mm (0.3 inches)76%moderate
December Weather4°C (39°F)15 mm (0.6 inches)78%moderate

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