Sea Temperature in San Mateo in December

Complete information on the sea temperature range in the Pacific Ocean in San Mateo in December. Historical daily data. Climate details for December. Tips on swimming conditions and beach relaxation in San Mateo. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature Range in San Mateo in December

50°F

MINIMUN

55°F

AVERAGE

61°F

MAXIMUM

Historical Data of Water Temperature in December in San Mateo

Water Temperature Chart for Pacific Ocean in San Mateo in December

Sea Temperature Table in San Mateo in December Over the Past Years

Day	2024	2023	2022	Average
Dec 1	54°C	55°C	54°C	55°C
Dec 2	52°C	57°C	54°C	55°C
Dec 3	54°C	55°C	54°C	55°C
Dec 4	54°C	57°C	54°C	56°C
Dec 5	54°C	55°C	52°C	55°C
Dec 6	54°C	55°C	52°C	55°C
Dec 7	54°C	57°C	54°C	56°C
Dec 8	54°C	54°C	57°C	55°C
Dec 9	54°C	54°C	57°C	54°C
Dec 10	54°C	57°C	54°C	55°C
Dec 11	54°C	57°C	54°C	55°C
Dec 12	52°C	55°C	54°C	54°C
Dec 13	52°C	55°C	54°C	54°C
Dec 14	52°C	55°C	52°C	53°C
Dec 15	52°C	55°C	52°C	53°C
Dec 16	52°C	55°C	52°C	53°C
Dec 17	52°C	55°C	52°C	53°C
Dec 18	52°C	55°C	52°C	53°C
Dec 19	52°C	55°C	52°C	53°C
Dec 20	52°C	55°C	54°C	54°C
Dec 21	52°C	55°C	52°C	53°C
Dec 22	52°C	55°C	52°C	53°C
Dec 23	52°C	55°C	52°C	53°C
Dec 24	54°C	55°C	52°C	54°C
Dec 25	54°C	55°C	50°C	53°C
Dec 26	54°C	55°C	50°C	53°C
Dec 27	52°C	55°C	52°C	53°C
Dec 28	52°C	55°C	52°C	53°C
Dec 29	52°C	55°C	52°C	53°C
Dec 30	54°C	57°C	52°C	54°C

San Mateo Climate and Swimming Opportunities in December

61°F

Average Day Air Temperature

45°F

Average Night Air Temperature

6 in

Precipitation Amount per Month

9 days

Number of Rainy Days

9 hrs

Daylight
per Day

5 hrs

Sunshine
per Day

8 mph

Average Wind Speed

79%

Average
humidity

San Mateo lies within the California in United States. The average daytime temperature in San Mateo in December is 61°F (16°C), while the nighttime average is 45°F (7°C). There are typically nine rainy days during the month, with a total precipitation of 6.1 inches (155 mm). The daylight duration in December in San Mateo is 9 hours, with an average of 5 hours of sunshine per day. The average wind speed in December is 8 mph (13 km/h), and the humidity level is around 79%.

The water temperature in San Mateo in December ranges from 52°F to 55°F (11°C to 13°C). At the beginning of the month, the average temperature is around 55°F (13°C), shifting to 54°F (12°C) by mid-December and reaching 54°F (12°C) in the last ten days. Overall, the average sea temperature in San Mateo for December is 54°F (12°C). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Sea Temperature in December in Nearby Cities

Frequently Asked Questions About Water Temperatures in December in San Mateo

What is the sea temperature in San Mateo in December?

The water temperature in the Pacific Ocean in San Mateo in December ranges from 52°F to 55°F (11°C to 13°C).

Is it possible to swim in the Pacific Ocean in San Mateo in December?

The average sea temperature in San Mateo in December is 54°F (12°C), and the air temperature is 61°F (16°C), so ideal conditions for a refreshing swim, though some may still find it a bit cool.