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January Weather in Grants Pass, United States

Last updated: June 24, 2025

In January, the average temperature in Grants Pass, United States hovers around 4°C (39°F), with potential lows of -11°C (13°F) and highs reaching 16°C (62°F). Expect about 138 mm (5.4 in) of precipitation spread over 14 days, contributing to an average humidity of 84%. Be prepared for a chilly and damp month!

January Temperature in Grants Pass

In January in Grants Pass, the average temperature is 4°C (39°F). The maximum can reach 16°C (62°F), while the minimum can drop as low as -11°C (13°F). Be prepared for a range of conditions if you plan to travel during this time.

January Weather in Grants Pass: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Grants Pass, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grants Pass, January typically has an average temperature of 4°C (39°F), with highs reaching up to 16°C (62°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec394044505764717164534438
Data source: Temperature data for Grants Pass 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 Grants Pass

In Grants Pass in January, the total precipitation amount is 138 mm (5.4 in) over a span of 14 days.

January Precipitation Trends in Grants Pass

The chart displays monthly precipitation patterns in Grants Pass, 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 Grants Pass, January typically receives around 138 mm (5.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec13815110388481915364186116
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Grants Pass

In Grants Pass in January, humidity is 84%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions uncomfortable and demanding more layers than you anticipate while traveling.

January Average Humidity in Grants Pass

This chart illustrates the average monthly humidity levels in Grants Pass, 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 Grants Pass is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Grants Pass

In Grants Pass in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Grants Pass, you can check the information here.

Maximum UV Index Levels in Grants Pass for January

The chart shows the monthly maximum UV Index (UVI) for Grants Pass 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 Grants Pass typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468101110108642
Data source: Grants Pass 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 Grants Pass Compares to Other Months

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

This table compares monthly weather conditions in Grants Pass, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)138 mm (5.4 inches)84%moderate
February Weather4°C (40°F)151 mm (5.9 inches)85%moderate
March Weather7°C (44°F)103 mm (4.0 inches)86%high
April Weather10°C (50°F)88 mm (3.5 inches)83%very high
May Weather14°C (57°F)48 mm (1.9 inches)83%very high
June Weather18°C (65°F)19 mm (0.7 inches)83%extreme
July Weather22°C (71°F)1 mm (0.0 inches)78%very high
August Weather22°C (71°F)5 mm (0.2 inches)67%very high
September Weather18°C (64°F)36 mm (1.4 inches)66%very high
October Weather12°C (53°F)41 mm (1.6 inches)77%high
November Weather7°C (44°F)86 mm (3.4 inches)87%moderate
December Weather3°C (38°F)116 mm (4.6 inches)87%low

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