October Weather in San Diego, Mexico

Last updated: August 27, 2025

In October, the average temperature in San Diego, Mexico hovers around 17°C (63°F), with a minimum dipping to 9°C (48°F) and a maximum reaching 27°C (81°F). Expect a wet month with 217 mm (8.5 in) of precipitation spread over 24 days, contributing to an average humidity of 90%. Get ready for a refreshing experience!

October Temperature in San Diego

In October in San Diego, the average temperature is 17°C (63°F). Maximum can reach 27°C (81°F), and the minimum can be as low as 9°C (48°F). This pleasant climate makes San Diego an ideal destination for travelers seeking mild and comfortable weather.

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

The chart illustrates October 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, October typically has an average temperature of 17°C (63°F), with highs reaching up to 27°C (81°F) and lows dropping to around 9°C (48°F).

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

October Precipitation in San Diego

In San Diego in October, the precipitation amount is 217 mm (8.5 in) over a span of 24 days.

October Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In San Diego, October typically receives around 217 mm (8.5 inches) of precipitation spread over approximately 24 days.

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

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Millimeters (mm) Inches (in)

October Humidity in San Diego

In San Diego in October humidity is 90%. With an average temperature of 17°C (63°F), this humidity feels like a heavy blanket wrapping around you, making travel feel sticky and exhausting as the air hangs thick and damp, making even short walks feel like a marathon.

October Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in San Diego is approximately 90%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in San Diego

In San Diego in October, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Diego.

Maximum UV Index Levels in San Diego for October

The chart shows the monthly maximum UV Index (UVI) for San Diego in October, 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 October, the maximum UV index in San Diego typically reaches 12, which falls under the extreme exposure category.

Data source: San Diego October 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 October 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 October’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 October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	88 mm (3.5 inches)	88%	very high
February Weather	15°C (58°F)	64 mm (2.5 inches)	86%	extreme
March Weather	16°C (61°F)	93 mm (3.7 inches)	84%	extreme
April Weather	18°C (65°F)	133 mm (5.2 inches)	81%	extreme
May Weather	19°C (67°F)	190 mm (7.5 inches)	82%	extreme
June Weather	19°C (66°F)	262 mm (10.3 inches)	81%	extreme
July Weather	18°C (65°F)	210 mm (8.3 inches)	81%	extreme
August Weather	18°C (65°F)	291 mm (11.4 inches)	82%	extreme
September Weather	18°C (65°F)	339 mm (13.3 inches)	86%	extreme
October Weather	17°C (63°F)	217 mm (8.5 inches)	90%	extreme
November Weather	15°C (59°F)	111 mm (4.4 inches)	91%	very high
December Weather	13°C (57°F)	51 mm (2.0 inches)	91%	very high