San Carlos (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Carlos.
Climate overview of San Carlos
The climate in San Carlos, California, United States of America, sees a moderate range of temperatures across the year, from 26°C (79°F) in September down to 15°C (59°F) in December.
The city has a relatively dry climate, receiving around 402 mm (16 in) of rainfall per year. It does experience a distinct dry season from April to November, with warm summers and mild winters. December is the wettest month and July the driest. Sunshine peaks in May, when the city sees around 10.8 hours of sunshine per day.
San Carlos Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Carlos - and find the best time to visit.
Monthly Temperature in San Carlos
The climate in San Carlos experiences moderate temperature changes, with mild shifts between seasons. On average, daytime temperatures range from a comfortable 26°C (79°F) in September to a moderate 15°C (59°F) in December.
Nighttime temperatures range from 14°C (57°F) in September to 5°C (41°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Carlos
San Carlos tends toward drier weather patterns, receiving approximately 402 mm (16 in) of rain per year. The seasons in San Carlos bring significant changes in precipitation. The wettest month, December, receives moderate rainfall, with an average of 97 mm (3.8 in) of precipitation. This rainfall is distributed across 12 rainy days.
In contrast, the driest month, July, experiences much less rainfall, totaling 0 mm (0 in) over 0 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our San Carlos Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in San Carlos
In San Carlos, summer days are longer and more sunny, with daily sunshine hours peaking at 10.8 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.3 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in San Carlos
The mean water temperature over the year ranges from 12°C (54°F) in January to 14°C (57°F) in June.
Water temperature over the year
Humidity in San Carlos by Month
The relative humidity is high throughout the year in San Carlos.
The city experiences its highest humidity in January, reaching 80%. In June, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in San Carlos
The mean wind speed over the year ranges from 3 m/s (6 knots) in January, November and December to 7 m/s (14 knots) in June and July. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit San Carlos
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June, July, August, September and October
- Warmest weather: June, July, August and September
- Most sunshine: April, May, June and July
- Fewer rainy days: May, June, July, August and September
- Seasonal pattern: A distinct dry season from April to November, with warm summers and mild winters
Frequently asked questions about the climate in San Carlos
What is the best time to visit San Carlos?
May, June, July, August, September and October typically offer the most optimal weather in San Carlos. In contrast, January, February and December tend to have less optimal conditions. San Carlos has a distinct dry season from April to November, with warm summers and mild winters.
What temperatures can I expect in San Carlos?
Daytime highs range from 15°C (59°F) in December to 26°C (79°F) in September. Nighttime lows range from 5°C (41°F) to 14°C (57°F).
How much rain does San Carlos get?
Annual rainfall is around 402 mm (16 in). December is the wettest month with 97 mm (3.8 in), while July is the driest with 0 mm (0 in).
How sunny is San Carlos?
San Carlos receives around 3,058 hours of sunshine per year. May is the sunniest month with 324 hours, while December is the cloudiest with just 160 hours. Overall, San Carlos enjoys abundant sunshine.
San Carlos 3-Day Forecast
San Carlos on the map
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