San Ysidro (CA) Weather and Climate: A Comprehensive Guide
The temperature in San Ysidro varies moderately throughout the year.
The temperatures shift from warm
to pleasant.
The city sits in an arid zone with minimal moisture.
Now, let’s break down all the climate details for a clearer picture.
Average maximum day and minimum night temperature
The climate in San Ysidro experiences moderate temperature changes, with mild shifts between seasons. Average daytime temperatures reach a comfortable 27°C in September. In December, the coolest month of the year, temperatures drop to a pleasant 19°C.
At night, you can expect cooler temperatures, with averages dropping to around 8°C during this month. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
San Ysidro has a dry climate with very low precipitation, averaging 220 mm of rainfall annually. San Ysidro can be quite wet during December, receiving approximately 58 mm of precipitation over 8 rainy days. In contrast June, experiences much drier conditions, with 0.3 mm of rainfall, spread across 0 rainy days. For more details, please visit our San Ysidro Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
San Ysidro experiences moderate variation in sunshine hours across the seasons. With 10.4 hours daily sunshine in July, it dips to 7.3 hours in January, offering a balanced mix of sunny and overcast days. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is high throughout the year in San Ysidro.
The city experiences its highest humidity in July, reaching 80%. In November, the humidity drops to its lowest level at 69%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
partly cloudy and no rain broken clouds and no rain almost clear and no rainForecast for San Ysidro (CA)
4 m/s
2 m/s
3 m/s
The best time of year to visit San Ysidro in the United States of America
During the months of January, March, April, May, June, July, October and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
The hottest season / summer takes place in July, August, September and October.
September has an average maximum temperature of 27°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 19°C.
December tops the wettest month list with 58 mm of rainfall.
June is the driest month with 0 mm of precipitation.
July is the sunniest month with an average of 312 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
