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April Weather in San Rafael, United States

Last updated: June 24, 2025

In San Rafael, United States, the average temperature in April hovers around 10°C (51°F). Be prepared for a range, as it can dip to a chilling -16°C (4°F) or rise to a pleasant 25°C (77°F)! Expect about 20 mm (0.8 in) of precipitation spread over 4 days, contributing to an average humidity of 61%. Stay comfortable and enjoy the diversity of the weather!

April Temperature in San Rafael

In April in San Rafael, the average temperature is 10°C (51°F). Maximum temperatures can reach 25°C (77°F), while minimums can dip as low as -16°C (4°F). Be prepared for a wide range of temperatures if you're traveling during this time.

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

The chart illustrates April 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, April typically has an average temperature of 10°C (51°F), with highs reaching up to 25°C (77°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec293342516071727064524232
Data source: Temperature data for San Rafael 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.

April Precipitation in San Rafael

In San Rafael in April, the total precipitation amount is 20 mm (0.8 in) spread over a period of 4 days.

April Precipitation Trends in San Rafael

The chart displays monthly precipitation patterns in San Rafael, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In San Rafael, April typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec242332201612583632241421
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Rafael

In San Rafael in April, humidity is 61%. With an average temperature of 10°C (51°F), this humidity feels like a damp chill that can penetrate your layers, making outdoor exploration a brisk and invigorating experience, perfect for cozying up in warm cafes or visiting indoor attractions.

April Average Humidity in San Rafael

This chart illustrates the average monthly humidity levels in San Rafael, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in San Rafael is approximately 61%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in San Rafael

In San Rafael in April, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Rafael.

Maximum UV Index Levels in San Rafael for April

The chart shows the monthly maximum UV Index (UVI) for San Rafael in April, 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 April, the maximum UV index in San Rafael typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111213131211864
Data source: San Rafael April 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 April 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 April’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 April’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

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