Weather · Half Moon Bay, United States
Half Moon Bay Weather in September
Half Moon Bay in September runs 21°C / 12°C with 14mm of rain, one of the best months to visit.
Avg high
21°C
70°F
Avg low
12°C
54°F
Rainfall
14mm
#9 wettest of 12
What to pack
Layers, plus a jacket for mornings and nights. Rain is unlikely to interrupt your plans.
Timing a trip around the weather? A Local Friend in Half Moon Bay builds it around the season for you.