Alcatraz Island Weather Forecast
Alcatraz Island weather: 60°F, mainly clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
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 60°F (15°C) in Alcatraz Island with mainly clear. It feels like 54°F. Today runs from 56°F to 69°F. Chance of precipitation is 1%. Sightseeing conditions score 9.1/10 - 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 about average for September. The forecast high of 69°F is in line with 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.
Weather in Alcatraz Island right now
Source: Open-Meteo. Updated 7:17 PM, Sep 19 local time.
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
16-day forecast for Alcatraz Island
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sat, Sep 19 | 🌥️ Fog | 69° / 56° | 1% | 18 mph | 7 |
| Sun, Sep 20 | 🌥️ Fog | 63° / 56° | 1% | 16 mph | 4 |
| Mon, Sep 21 | 🌥️ Fog | 64° / 56° | 2% | 12 mph | 6 |
| Tue, Sep 22 | ☁️ Overcast | 70° / 58° | 1% | 11 mph | 6 |
| Wed, Sep 23 | ☁️ Overcast | 73° / 58° | 0% | 7 mph | 6 |
| Thu, Sep 24 | ☁️ Overcast | 74° / 60° | 0% | 11 mph | 6 |
| Fri, Sep 25 | ☁️ Overcast | 68° / 59° | 0% | 13 mph | 6 |
| Sat, Sep 26 | ⛅ Partly cloudy | 68° / 58° | 1% | 9 mph | 5 |
| Sun, Sep 27 | 🌤️ Mainly clear | 66° / 57° | 2% | 18 mph | 6 |
| Mon, Sep 28 | ☀️ Clear sky | 74° / 59° | 1% | 8 mph | 6 |
| Tue, Sep 29 | ☀️ Clear sky | 80° / 61° | 3% | 8 mph | 6 |
| Wed, Sep 30 | ☁️ Overcast | 91° / 65° | 4% | 5 mph | 6 |
| Thu, Oct 1 | ☁️ Overcast | 85° / 69° | 3% | 7 mph | 6 |
| Fri, Oct 2 | ☁️ Overcast | 74° / 62° | 0% | 9 mph | 6 |
| Sat, Oct 3 | 🌦️ Light showers | 70° / 60° | 0% · 0,4 in | 8 mph | 6 |
| Sun, Oct 4 | 🌦️ Drizzle | 71° / 62° | 0% · 0,2 in | 8 mph | 6 |
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 | 68° | 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).
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.
Air quality and pollen in Alcatraz Island
Air quality: Open-Meteo (CAMS). US AQI scale.
Sun, twilight and moon
Golden and blue hour are the standard photographic approximation around sunrise and sunset.
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.
Explore Alcatraz Island
Every topic we hold for this place, and the same topic for the places around it.
Weather 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 60°F (15°C) with mainly clear. Humidity is 82% and wind is 16 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 7:17 PM.
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 Yosemite National Park.
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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 September 19, 2026 at 7:17 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
