Alcatraz water temp
This data the coastal Alcatraz ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Alcatraz
Water temperature in Alcatraz today is 66.4°F. Based on our historical data over a period of ten years, the warmest water in this day in Alcatraz was recorded in 2024 and was 67.3°F, and the coldest 55.9°F. Sea water temperature in Alcatraz is expected to drop to 60.1°F in the next 10 days. October average water temperature in Alcatraz is 60.1°F, the minimum temperature is 54.5°F, and the maximum is 67.3°F.
Throughout the year, the water temperature in Alcatraz does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of September, the water temperature warms up to 68°F and above. The average water temperature in Alcatraz in winter reaches 52.9°F, in spring 55.4°F, in summer the average temperature rises to 59.9°F, and in autumn it is 59.7°F.
Alcatraz water temperature now
| October 6, 2025 |
|---|
| today temp |
| 66.4°F |
| October 5, 2025 |
|---|
| yesterday temp |
| 66.2°F |
The ocean salinity in Alcatraz is 27.91‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Alcatraz for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Alcatraz. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Alcatraz. Data in table shown for October 6, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 1' 1" | 1' 1" | 1' 1" | 1' 1" |
| 0.33 m | 0.33 m | 0.33 m | 0.33 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 1" | 1' 1" | 1' 0" | 1' 0" |
| 0.32 m | 0.32 m | 0.31 m | 0.3 m |
Surf report in Alcatraz
Alcatraz weather forecast
Current temperature and weather
Data in a table show Alcatraz temperature today (October 6, 2025). For more information and forecast for a few days, go to the weather forecast Alcatraz.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 60.6°F | 57.7°F | 56.3°F | 64.2°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| | | |
| 71.4°F | 73°F | 66.2°F | 62.4°F |
You may also be interested in other sections of our site for Alcatraz: Sunrise and Sunset, Tides
Alcatraz water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Alcatraz. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Alcatraz on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 52°F | 49.5°F | 56.8°F | cold |
| Ocean water temperature in Alcatraz in January | ||||
| February | 53.2°F | 49.6°F | 58.8°F | cold |
| Ocean water temperature in Alcatraz in February | ||||
| March | 54.5°F | 49.3°F | 59.2°F | cold |
| Ocean water temperature in Alcatraz in March | ||||
| April | 55.8°F | 51.1°F | 61.9°F | cold |
| Ocean water temperature in Alcatraz in April | ||||
| May | 56.1°F | 50.5°F | 63.5°F | cold |
| Ocean water temperature in Alcatraz in May | ||||
| June | 58.5°F | 51.8°F | 67.1°F | cold |
| Ocean water temperature in Alcatraz in June | ||||
| July | 59.9°F | 53.4°F | 66.4°F | cold |
| Ocean water temperature in Alcatraz in July | ||||
| August | 61.3°F | 54°F | 69.1°F | cold |
| Ocean water temperature in Alcatraz in August | ||||
| September | 61.7°F | 55.8°F | 69.3°F | cold |
| Ocean water temperature in Alcatraz in September | ||||
| October | 60.1°F | 54.5°F | 67.3°F | cold |
| Ocean water temperature in Alcatraz in October | ||||
| November | 57.2°F | 52.3°F | 62.8°F | cold |
| Ocean water temperature in Alcatraz in November | ||||
| December | 53.6°F | 50.2°F | 59°F | cold |
| Ocean water temperature in Alcatraz in December | ||||
Chart monthly average water temperature in Alcatraz
