January Weather in San Francisco, Guatemala

Last updated: August 23, 2025

In January, the average temperature in San Francisco, Guatemala is a comfortable 24°C (75°F), making it an ideal time to explore. However, be prepared for some variation, as temperatures can dip to a minimum of 13°C (56°F) and soar as high as 36°C (97°F). With 43 mm (1.7 in) of precipitation spread over 9 days, it's wise to pack an umbrella. Enjoy the warm, balmy atmosphere with an average humidity of 84%, which adds a touch of tropical bliss to your stay!

January Temperature in San Francisco

In January in San Francisco, the average temperature is 24°C (75°F), with maximums reaching up to 36°C (97°F) and minimums dropping as low as 13°C (56°F). It's a great time to explore San Francisco, so pack accordingly to enjoy both warm days 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 24°C (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 13°C (56°F).

Data source: Temperature data for San Francisco generated using information from the Copernicus Climate Change Service.

January Precipitation in San Francisco

In San Francisco in January, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 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 43 mm (1.7 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in San Francisco

In San Francisco in January humidity is 84%. With an average temperature of 24°C (75°F), this humidity feels like a warm, tropical embrace, making it essential for travelers to stay hydrated and plan outdoor activities for early mornings or late afternoons when the heat is more bearable.

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 84%, offering insight into how humid the weather typically is during this month.

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 is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, 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 9, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (75°F)	43 mm (1.7 inches)	84%	very high
February Weather	25°C (78°F)	23 mm (0.9 inches)	73%	extreme
March Weather	27°C (81°F)	31 mm (1.2 inches)	59%	extreme
April Weather	30°C (87°F)	40 mm (1.6 inches)	52%	extreme
May Weather	31°C (87°F)	104 mm (4.1 inches)	53%	extreme
June Weather	28°C (83°F)	247 mm (9.7 inches)	55%	extreme
July Weather	28°C (83°F)	136 mm (5.4 inches)	61%	extreme
August Weather	28°C (83°F)	158 mm (6.2 inches)	71%	extreme
September Weather	28°C (82°F)	215 mm (8.4 inches)	77%	extreme
October Weather	27°C (80°F)	200 mm (7.9 inches)	78%	extreme
November Weather	25°C (77°F)	110 mm (4.3 inches)	82%	very high
December Weather	24°C (75°F)	55 mm (2.2 inches)	86%	very high