January Weather in San Diego, Guatemala

Last updated: August 23, 2025

In January, the average temperature in San Diego, Guatemala is a pleasant 20°C (68°F). Temperatures can range from a cool 9°C (49°F) to a warm 33°C (91°F). Expect 7 mm (0.3 in) of precipitation over about 2 days, accompanied by an average humidity level of 80%. Enjoy the mild climate!

January Temperature in San Diego

In January in San Diego, the average temperature is 20°C (68°F). Maximums can reach 33°C (91°F), while minimums can be as low as 9°C (49°F). This makes San Diego an ideal destination for travelers seeking a pleasant climate for outdoor activities.

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

The chart illustrates January temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Diego, January typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (91°F) and lows dropping to around 9°C (49°F).

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

January Precipitation in San Diego

In San Diego in January, the precipitation amount is 7 mm (0.3 in) over a period of 2 days.

January Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, 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 Diego, January typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 2 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 Diego

In San Diego in January, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

January Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, 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 Diego is approximately 80%, 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 Diego

In San Diego 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 Diego.

Maximum UV Index Levels in San Diego for January

The chart shows the monthly maximum UV Index (UVI) for San Diego 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 Diego typically reaches 11, which falls under the extreme exposure category.

Data source: San Diego 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 Diego Compares to Other Months

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

This table compares monthly weather conditions in San Diego, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	20°C (68°F)	7 mm (0.3 inches)	80%	extreme
February Weather	21°C (70°F)	6 mm (0.2 inches)	72%	extreme
March Weather	22°C (72°F)	7 mm (0.3 inches)	61%	extreme
April Weather	24°C (76°F)	24 mm (0.9 inches)	53%	extreme
May Weather	24°C (76°F)	126 mm (4.9 inches)	51%	extreme
June Weather	23°C (74°F)	184 mm (7.2 inches)	52%	extreme
July Weather	23°C (74°F)	58 mm (2.3 inches)	58%	extreme
August Weather	23°C (74°F)	108 mm (4.3 inches)	63%	extreme
September Weather	23°C (74°F)	125 mm (4.9 inches)	71%	extreme
October Weather	22°C (73°F)	134 mm (5.3 inches)	79%	extreme
November Weather	21°C (70°F)	56 mm (2.2 inches)	79%	very high
December Weather	20°C (68°F)	13 mm (0.5 inches)	74%	very high