San Francisco in September

Average high

21°C

70°F

Average low

13°C

55°F

Precipitation

3 mm

Wet days

1

Climate data: NOAA (downtown San Francisco, 1991–2020). Temperatures are averages of daily highs and lows.

Is September a good time to visit San Francisco?

September is the best month to visit San Francisco. It ranks 1 of 12 months in San Francisco overall (1 for weather, 8 for space, 9 for value). The main upside: The warmest, clearest weather. The main downside: Conference weeks can be pricey.

What is the weather like in San Francisco in September?

Average highs are around 21°C and lows around 13°C. Expect about 3 mm of rain or snow over roughly 1 wet days. Warm, sunny and the clearest month. For comparison, the warmest month is September (around 21°C) and the coolest is January (around 14°C).

Is San Francisco crowded in September?

Crowds are moderate–high. Fairly busy. The quietest month is January.

How expensive is San Francisco in September?

Prices are at level 3 of 5 ($$$). Mid-to-high, depending on conferences. The best-value month is January.

When is the best time to visit San Francisco?

In the CrowdFreeViews month scores, September is the best month overall (this month). The quietest month is January and the best value is January.