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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

83.1

°F

April 21, 04:09

Trend:

increasing

Yesterday:

83.1°F

Tomorrow:

83.4°F

Sunrise:

05:26

Sunset:

17:48

Day Length:

12 h. 22 min.

San Francisco in April

Minimum:

81.1°F

Average:

82.3°F

Maximum:

83.6°F

Sea water temperature in San Francisco today

As of now, in San Francisco, the water temperature is 83.1°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 0.2°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 83.9°F on 2025, while the historical minimum was 81.3°F on 2019.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 83.6°F, with minimum temperature starting at 83.4°F, while the maximum might reach 83.7°F.

Daily water temperature in San Francisco

Date Current Year

actual* / forecast**

 last year 10 years average
Apr 7 82.5°F 83.4°F 82.1°F
Apr 8 82.5°F 83.6°F 82.1°F
Apr 9 82.4°F 83.3°F 82.2°F
Apr 10 82.5°F 83.2°F 82.4°F
Apr 11 82.6°F 83.2°F 82.4°F
Apr 12 82.2°F 83.4°F 82.4°F
Apr 13 81.8°F 83.3°F 82.5°F
Apr 14 81.7°F 83.6°F 82.7°F
Apr 15 82.2°F 84.3°F 82.9°F
Apr 16 81.9°F 84.2°F 82.8°F
Apr 17 81.6°F 84.0°F 82.8°F
Apr 18 82.1°F 83.8°F 82.8°F
Apr 19 82.6°F 83.6°F 82.9°F
Apr 20 83.1°F 84.0°F 82.9°F
Apr 21 83.1°F 83.9°F 82.9°F
Apr 22 83.4°F 83.9°F 83.2°F
Apr 23 83.6°F 84.1°F 83.4°F
Apr 24 83.6°F 83.9°F 83.4°F
Apr 25 83.7°F 83.8°F 83.5°F
Apr 26 83.7°F 83.6°F 83.5°F
Apr 27 83.6°F 83.5°F 83.4°F
Apr 28 83.6°F 83.7°F 83.4°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

January

February

March

April

May

June

July

August

September

October

November

December

In San Francisco, the water temperature is comfortable for swimming all year round.
The warmest water in San Francisco was recorded on October 26, 2023, reaching a 87.6°F. While the coldest temperature occurred on February 23, 2019, dipping to 79.2°F. The average readings by season are 82.1°F in Winter, 82.9°F in Spring, 85.3°F in Summer, and 85.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
San Francisco 83.2°F 18mi
Madrid 84.5°F 37mi
San Francisco 83.1°F 43mi
San Jose 83.4°F 45mi
Santa Monica 84.1°F 51mi
Burgos 84.5°F 51mi
Medina 82.9°F 53mi
San Juan 83.2°F 55mi

* current water temperature in this city

** straight line distance from San Francisco