Alcatraz Island Climate and Average Weather
Climate of Alcatraz Island: average temperatures, rainfall and seasons month by month.
Climate in Alcatraz Island month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 58° | 46° | 3,3 in | ★★★☆☆ |
| February | 59° | 47° | 5,6 in | ★★★☆☆ |
| March | 64° | 50° | 3,0 in | ★★★★☆ |
| April | 63° | 50° | 2,0 in | ★★★★☆ |
| May | 65° | 52° | 0,6 in | ★★★★★ |
| June | 66° | 54° | 0,0 in | ★★★★★ |
| July | 65° | 55° | 0,1 in | ★★★★★ |
| August | 69° | 57° | 0,0 in | ★★★★★ |
| September | 69° | 58° | 0,2 in | ★★★★★ |
| October | 71° | 55° | 0,7 in | ★★★★★ |
| November | 62° | 50° | 4,1 in | ★★★☆☆ |
| December | 57° | 47° | 5,8 in | ★★★☆☆ |
Climate type: Temperate. Source: Open-Meteo archive (ERA5).
Recent extremes in Alcatraz Island
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Alcatraz Island compares with nearby places
Annual averages, and the difference against Alcatraz Island.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Fisherman's Wharf | 1 mi | 57°F | about the same | 25 in |
| ZIP Code 94133 | 2 mi | 57°F | about the same | 25 in |
| Golden Gate Bridge | 3 mi | 57°F | about the same | 25 in |
| ZIP Code 94102 | 3 mi | 57°F | about the same | 25 in |
| Area Code 415 | 4 mi | 57°F | about the same | 25 in |
Best time to visit Alcatraz Island
Go in May, June, July, August, September and October. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What this means for Alcatraz Island
Today is slightly warmer than average for August. The forecast high of 76°F is 6.8°F above the 69°F typical for this month.
Rain is very unlikely today - plans do not need a backup.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 43°F - an unusually even climate through the year.
What to pack, what to skip
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
Alcatraz Island is a tourist attraction in San Francisco. Alcatraz Island is a landmark known for the former federal prison in the bay.
Right now it is 59°F (15°C) in Alcatraz Island with mainly clear. It feels like 57°F. Today runs from 56°F to 76°F. Chance of precipitation is 2%. Sightseeing conditions score 9.4/10 - excellent - go now.
The best time to visit Alcatraz Island is May, June, July, August, September and October. The climate is temperate. January, February and December tend to be the least comfortable months. October is the warmest month with average highs near 71°F, while January is the coldest with lows near 46°F.
The closest major airport is San Francisco International Airport (SFO), about 14 mi away. Nearby highlights include Golden Gate Bridge, Point Lobos State Natural Reserve, Pinnacles National Park and Julia Pfeiffer Burns State Park.
In plain terms. Today is slightly warmer than average for August. The forecast high of 76°F is 6.8°F above the 69°F typical for this month. The best window to be outside is roughly 2 PM to 5 PM, when temperature, rain chance and wind line up best. photography is the strongest bet in Alcatraz Island today at 9.7/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Alcatraz Island
| Type | Attraction |
|---|---|
| City | San Francisco |
| Country | United States |
| Continent | North America |
| Coordinates | 37°49′36.1″N 122°25′22.8″W (37.8267, -122.423) |
| Known for | the former federal prison in the bay |
| Local time | 7:10 AM (UTC-07:00) |
| Best months | May, June, July, August, September and October |
| Climate | Temperate |
Weather map for Alcatraz Island
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Alcatraz Island
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Alcatraz Island?
Alcatraz Island is a tourist attraction in San Francisco. Its coordinates are 37.8267, -122.423. It lies in North America.
What is the weather like in Alcatraz Island right now?
It is currently 59°F (15°C) with mainly clear. Humidity is 93% and wind is 10 mph.
When is the best time to visit Alcatraz Island?
May, June, July, August, September and October offer the most comfortable conditions in Alcatraz Island, which has a temperate climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Alcatraz Island in?
Alcatraz Island observes America/Los_Angeles (UTC-07:00). The local time is 7:10 AM.
What is the nearest airport to Alcatraz Island?
The closest airports are San Francisco International Airport (SFO), 14 mi away.
What are the top things to do in Alcatraz Island?
Popular options include Golden Gate Bridge, Point Lobos State Natural Reserve, Pinnacles National Park, Julia Pfeiffer Burns State Park, Emerald Bay State Park and Lake Tahoe.
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| Place data | USPOTUS Atlas dataset (attractions) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 24, 2026 at 7:10 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
