All data are in degrees Fahrenheit

en

Water temperature in San Francisco

Detailed information about the current water temperature in San Francisco. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in San Francisco now

81.0

°F

December 13, 14:08

Trend:

stable

Yesterday:

80.5°F

Tomorrow:

80.8°F

Sunrise:

07:29

Sunset:

18:22

Day Length:

10 h. 53 min.

San Francisco in December

Minimum:

71.5°F

Average:

77.4°F

Maximum:

79.9°F

Sea water temperature in San Francisco today

As of now, in San Francisco, the water temperature is 81.0°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.8°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 82.3°F on 2023, while the historical minimum was 77.6°F on 2024.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 80.4°F, the minimum temperature may reach 80.2°F, and the maximum might stay at 80.8°F.

Daily water temperature in San Francisco

Date Current Year

actual* / forecast**

last year 10 years average
Nov 29 83.4°F 80.5°F 82.0°F
Nov 30 82.9°F 80.2°F 81.8°F
Dec 1 82.7°F 80.0°F 81.6°F
Dec 2 82.4°F 79.4°F 81.4°F
Dec 3 81.8°F 78.8°F 81.3°F
Dec 4 82.2°F 79.1°F 81.4°F
Dec 5 82.9°F 79.1°F 81.3°F
Dec 6 82.5°F 79.1°F 81.2°F
Dec 7 82.1°F 79.1°F 81.1°F
Dec 8 81.7°F 79.0°F 81.1°F
Dec 9 81.2°F 79.2°F 81.0°F
Dec 10 81.3°F 78.7°F 80.8°F
Dec 11 81.6°F 78.7°F 80.8°F
Dec 12 80.5°F 78.4°F 80.4°F
Dec 13 81.0°F 77.6°F 80.2°F
Dec 14 80.8°F 76.9°F 80.0°F
Dec 15 80.6°F 76.7°F 79.8°F
Dec 16 80.6°F 76.7°F 79.8°F
Dec 17 80.2°F 76.7°F 79.4°F
Dec 18 80.2°F 77.6°F 79.5°F
Dec 19 80.4°F 78.8°F 79.6°F
Dec 20 80.3°F 79.0°F 79.5°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in San Francisco by month

In San Francisco, the water temperature is comfortable for swimming all year round.
The warmest water in San Francisco was recorded on July 31, 2023, reaching a 89.6°F. While the coldest temperature occurred on January 25, 2025, dipping to 70.5°F. The average readings by season are 77.8°F in Winter, 78.2°F in Spring, 85.7°F in Summer, and 85.9°F in Autumn.