San Francisco International Airport sits about 12 miles south of downtown, with a BART station inside the International Terminal. The city's weather is cool and mild year-round, and its warmest months are typically September and October.
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12 miles (19 km) from the city centre. 54.5 million passengers in 2025
| How | Route | Time | Cost |
|---|---|---|---|
| Train | BART Yellow or Red Line from the International Terminal to downtown San Francisco stations | about 30m | regular BART fare plus a $5.51 airport surcharge |
Domestic travel within the United States: no passport or visa is needed, but adults must show a REAL ID-compliant license or another accepted ID at airport security.
Since May 7, 2025, every air traveler 18 or older needs a REAL ID-compliant driver's license, an enhanced driver's license, a valid passport, or another TSA-accepted ID to fly within the US. Travelers without acceptable ID are denied passage through the checkpoint. REAL ID cards show a star at the top.
Weather is mild all year; September and October have the warmest average highs (about 70F), while winter highs sit near 58F.
| Month | Avg high | Avg low |
|---|---|---|
| Jan | 57.8°F (14°C) | 46.6°F (8°C) |
| Feb | 60.4°F (16°C) | 47.9°F (9°C) |
| Mar | 62.1°F (17°C) | 48.9°F (9°C) |
| Apr | 63°F (17°C) | 49.7°F (10°C) |
| May | 64.1°F (18°C) | 51.4°F (11°C) |
| Jun | 66.5°F (19°C) | 53°F (12°C) |
| Jul | 66.3°F (19°C) | 54.4°F (12°C) |
| Aug | 67.9°F (20°C) | 55.5°F (13°C) |
| Sep | 70.2°F (21°C) | 55.6°F (13°C) |
| Oct | 69.8°F (21°C) | 54.4°F (12°C) |
| Nov | 63.7°F (18°C) | 50.7°F (10°C) |
| Dec | 57.9°F (14°C) | 47°F (8°C) |
San Francisco is served by San Francisco International Airport (SFO). San Francisco International Airport handled about 54.5 million passengers in 2025.
Domestic travel within the United States: no passport or visa is needed, but adults must show a REAL ID-compliant license or another accepted ID at airport security. Since May 7, 2025, every air traveler 18 or older needs a REAL ID-compliant driver's license, an enhanced driver's license, a valid passport, or another TSA-accepted ID to fly within the US. Travelers without acceptable ID are denied passage through the checkpoint. REAL ID cards show a star at the top.
Weather is mild all year; September and October have the warmest average highs (about 70F), while winter highs sit near 58F.
BART Yellow or Red Line from the International Terminal to downtown San Francisco stations, about 30 minutes, regular BART fare plus a $5.51 airport surcharge.
San Francisco uses the US dollar (USD).
Flying out of San Francisco? See destinations from San Francisco
Information checked in October 2026. Schedules, fares and entry rules change, so confirm with the airline or the official source before you travel.