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January Weather in San Francisco, El Salvador

Last updated: August 23, 2025

In San Francisco, El Salvador, the average temperature in January is a comfortable 26°C (78°F), with minimums dropping to 15°C (60°F) and maximums soaring to 35°C (96°F). You'll enjoy surprisingly low precipitation, with only 2 mm (0.1 in) recorded during 0 days. The air is refreshingly humid, averaging at 63%.

January Temperature in San Francisco

In January in San Francisco, the average temperature is 26°C (78°F). Maximums can reach 35°C (96°F), while minimums can drop as low as 15°C (60°F). This diverse temperature range makes San Francisco an ideal destination for travelers seeking a balance of warmth and cooler evenings.

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

The chart illustrates January temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Francisco, January typically has an average temperature of 26°C (78°F), with highs reaching up to 35°C (96°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec788082828079818078777777
Data source: Temperature data for San Francisco 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 San Francisco

In San Francisco in January, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

January Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, 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 Francisco, January typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec2265533226797234295335644
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in San Francisco

In San Francisco in January humidity is 63%. With an average temperature of 26°C (78°F), this humidity feels like a warm, tropical embrace, making outdoor activities pleasantly refreshing yet slightly sticky, perfect for leisurely strolls and beachside adventures.

January Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, 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 Francisco is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%59%59%59%68%78%79%77%77%75%67%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Francisco

In San Francisco in January, 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 Francisco.

Maximum UV Index Levels in San Francisco for January

The chart shows the monthly maximum UV Index (UVI) for San Francisco 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 Francisco typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec11121414141413131313109
Data source: San Francisco 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 Francisco Compares to Other Months

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

This table compares monthly weather conditions in San Francisco, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather26°C (78°F)2 mm (0.1 inches)63%extreme
February Weather27°C (80°F)2 mm (0.1 inches)62%extreme
March Weather28°C (83°F)6 mm (0.2 inches)59%extreme
April Weather28°C (83°F)55 mm (2.2 inches)59%extreme
May Weather27°C (80°F)332 mm (13.1 inches)59%extreme
June Weather26°C (79°F)267 mm (10.5 inches)68%extreme
July Weather27°C (81°F)97 mm (3.8 inches)77%extreme
August Weather26°C (80°F)234 mm (9.2 inches)79%extreme
September Weather26°C (78°F)295 mm (11.6 inches)77%extreme
October Weather25°C (77°F)335 mm (13.2 inches)77%extreme
November Weather25°C (77°F)64 mm (2.5 inches)75%very high
December Weather25°C (77°F)4 mm (0.2 inches)66%very high

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