All data are in degrees Fahrenheit

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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

81.4

°F

May 17, 16:52

Trend:

stable

Yesterday:

81.6°F

Tomorrow:

81.6°F

Sunrise:

07:23

Sunset:

20:33

Day Length:

13 h. 10 min.

San Francisco in May

Minimum:

71.5°F

Average:

77.9°F

Maximum:

80.2°F

Sea water temperature in San Francisco today

As of now, in San Francisco, the water temperature is 81.4°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.5°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. 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 83.6°F on 2018, while the historical minimum was 77.7°F on 2019.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 81.8°F, with minimum temperature starting at 81.5°F, while the maximum might reach 82.3°F.

Daily water temperature in San Francisco

Date Current Year

actual* / forecast**

last year 10 years average
May 3 80.5°F 78.9°F 79.5°F
May 4 79.8°F 78.4°F 79.4°F
May 5 80.1°F 79.0°F 79.6°F
May 6 80.4°F 79.1°F 79.8°F
May 7 80.3°F 79.3°F 79.8°F
May 8 80.5°F 79.0°F 80.0°F
May 9 80.9°F 79.9°F 79.9°F
May 10 81.0°F 79.9°F 80.0°F
May 11 81.1°F 79.9°F 80.0°F
May 12 81.4°F 80.3°F 80.4°F
May 13 82.4°F 80.9°F 80.9°F
May 14 83.2°F 81.0°F 81.1°F
May 15 82.4°F 80.5°F 80.8°F
May 16 81.6°F 80.9°F 80.8°F
May 17 81.4°F 81.3°F 80.9°F
May 18 81.6°F 81.1°F 81.1°F
May 19 81.5°F 81.8°F 81.0°F
May 20 81.6°F 82.0°F 81.1°F
May 21 81.7°F 82.5°F 81.2°F
May 22 82.1°F 83.3°F 81.6°F
May 23 82.2°F 83.4°F 81.7°F
May 24 82.3°F 83.4°F 81.8°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, 85.6°F in Summer, and 85.8°F in Autumn.