Pack or skip
Umbrella for San Francisco in September
Verdict
Skip it
Only about 2 rainy days on average — you can risk it.
Why
San Francisco in September averages highs of 70°F, lows of 57°F, 2 rainy days.
That climate means an umbrella isn't pulling its weight. Only about 2 rainy days on average — you can risk it.
What to bring instead
Consider rain jacket instead →
See the pack-or-skip verdict for rain jacket in San Francisco in September.