January Weather in Rancho San Diego, United States

Last updated: June 24, 2025

In January, the average temperature in Rancho San Diego, United States hovers around 13°C (56°F). You'll experience a comfortable range, with minimums dipping to 4°C (39°F) and maximums reaching a warm 30°C (86°F). Be prepared for some rain, as the area sees about 56 mm (2.2 in) of precipitation spread over 6 days. The average humidity sits at a balmy 72%, making for a refreshing atmosphere!

January Temperature in Rancho San Diego

In January in Rancho San Diego, the average temperature is 13°C (56°F). The maximum can reach 30°C (86°F), while the minimum can drop to as low as 4°C (39°F). This diverse temperature range makes Rancho San Diego an ideal destination for travelers seeking a mix of warm and cool conditions.

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

The chart illustrates January temperature patterns in Rancho 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 Rancho San Diego, January typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (86°F) and lows dropping to around 4°C (39°F).

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

January Precipitation in Rancho San Diego

In Rancho San Diego in January, the precipitation amount is 56 mm (2.2 in) spread over 6 days.

January Precipitation Trends in Rancho San Diego

The chart displays monthly precipitation patterns in Rancho 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 Rancho San Diego, January typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 6 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 Rancho San Diego

In Rancho San Diego in January, humidity is 72%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making outdoor activities somewhat uncomfortable and reminding travelers to stay hydrated and seek shade whenever possible.

January Average Humidity in Rancho San Diego

This chart illustrates the average monthly humidity levels in Rancho 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 Rancho San Diego is approximately 72%, 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 Rancho San Diego

In Rancho San Diego in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rancho San Diego for better planning.

Maximum UV Index Levels in Rancho San Diego for January

The chart shows the monthly maximum UV Index (UVI) for Rancho 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 Rancho San Diego typically reaches 4, which falls under the moderate exposure category.

Data source: Rancho 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 Rancho San Diego Compares to Other Months

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

This table compares monthly weather conditions in Rancho 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	13°C (56°F)	56 mm (2.2 inches)	72%	moderate
February Weather	13°C (56°F)	68 mm (2.7 inches)	77%	high
March Weather	14°C (57°F)	51 mm (2.0 inches)	67%	very high
April Weather	16°C (61°F)	24 mm (0.9 inches)	56%	very high
May Weather	17°C (63°F)	21 mm (0.8 inches)	46%	extreme
June Weather	19°C (67°F)	2 mm (0.1 inches)	48%	extreme
July Weather	22°C (72°F)	3 mm (0.1 inches)	46%	extreme
August Weather	23°C (74°F)	1 mm (0.1 inches)	42%	very high
September Weather	22°C (72°F)	4 mm (0.1 inches)	52%	very high
October Weather	20°C (68°F)	14 mm (0.6 inches)	58%	high
November Weather	17°C (62°F)	29 mm (1.1 inches)	66%	moderate
December Weather	14°C (57°F)	65 mm (2.5 inches)	74%	moderate