nomadseason

January Weather in San Rafael, United States

Last updated: June 24, 2025

In January, the average temperature in San Rafael, United States hovers around -2°C (29°F), with extremes that can plunge to a minimum of -23°C (-9°F) and peak at a pleasant 15°C (60°F). During this month, expect about 24 mm (1.0 in) of precipitation spread over 5 days, while humidity lingers at a brisk 81%. Stay warm and prepare for a mix of wintery chills and occasional breaks in the weather!

January Temperature in San Rafael

In January in San Rafael, the average temperature is -2°C (29°F). The maximum can reach 15°C (60°F) and the minimum can be as low as -23°C (-9°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack accordingly for both cold and milder conditions.

January Weather in San Rafael: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Rafael, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Rafael, January typically has an average temperature of -2°C (29°F), with highs reaching up to 15°C (60°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec293342516071727064524232
Data source: Temperature data for San Rafael generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in San Rafael

In San Rafael in January, the precipitation amount is 24 mm (1.0 in) spread over the course of 5 days.

January Precipitation Trends in San Rafael

The chart displays monthly precipitation patterns in San Rafael, 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 San Rafael, January typically receives around 24 mm (1.0 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec242332201612583632241421
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

January Humidity in San Rafael

In San Rafael in January humidity is 81%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm while traveling.

January Average Humidity in San Rafael

This chart illustrates the average monthly humidity levels in San Rafael, 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 San Rafael is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%83%71%61%48%36%37%46%62%74%82%82%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Rafael

In San Rafael in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in San Rafael.

Maximum UV Index Levels in San Rafael for January

The chart shows the monthly maximum UV Index (UVI) for San Rafael 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 San Rafael typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111213131211864
Data source: San Rafael 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 San Rafael Compares to Other Months

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

This table compares monthly weather conditions in San Rafael, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)24 mm (1.0 inches)81%moderate
February Weather1°C (34°F)23 mm (0.9 inches)83%high
March Weather6°C (43°F)31 mm (1.2 inches)71%very high
April Weather10°C (51°F)20 mm (0.8 inches)61%extreme
May Weather15°C (60°F)16 mm (0.6 inches)48%extreme
June Weather22°C (71°F)12 mm (0.5 inches)36%extreme
July Weather22°C (72°F)58 mm (2.3 inches)37%extreme
August Weather21°C (70°F)36 mm (1.4 inches)46%extreme
September Weather18°C (65°F)32 mm (1.3 inches)62%extreme
October Weather11°C (53°F)23 mm (0.9 inches)74%very high
November Weather6°C (42°F)14 mm (0.6 inches)82%high
December Weather0°C (32°F)21 mm (0.8 inches)82%moderate

Compare San Rafael's Climate with Cities Worldwide