What to expect in San Francisco in September
September is one of the best times to visit San Francisco. Expect 22° / 13°, manageable crowds at the big attractions and prices close to the yearly average.
San Francisco weather in September
Typical conditions in San Francisco during September, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 22°C 72°F |
|---|---|
| Average low | 13°C 55°F |
| Rainfall | Dry 5/100 |
| Total rainfall | 5 mm0.2 in |
| Rainy days | 2 |
| Sea temperature | 14°C 58°F |
| Daylight | 12 h 27 min |
| How it feels | Warm and comfortable |
Average highs sit around 22°C with lows near 13°C. It is one of the drier months — pack light.
Crowds & demand
Crowd levels are Moderate for San Francisco — manageable crowds at the big attractions.
Prices & value
This month counts as shoulder season: prices close to the yearly average.
What to pack
Light layers for 22°C days and something with sleeves for evenings, which cool to around 13°C. Rain gear is largely optional this month, which keeps your bag light.
What it costs
Costs in September sit around the yearly average for San Francisco — neither a bargain nor a squeeze. Booking a few weeks out is usually enough. Compared with the most expensive month of the year, you are looking at roughly 8% less.
Who this month suits
- Travellers who want the most reliable weather
- Anyone travelling on a budget
Events & what’s on
No major festivals fall in September, so the destination feels like its everyday self.
San Francisco in September compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| July | 19° / 12° | High | $$ | 54 |
| August | 19° / 13° | High | $$ | 54 |
| September · This month | 22° / 13° | Moderate | $$ | 63 |
| October | 21° / 12° | Moderate | $$ | 61 |
| November | 18° / 10° | Moderate | $$ | 64 |
These months score higher for San Francisco on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in September
If the destination is negotiable but the month is not, these places are at their best in September.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated October 2026
