Half Moon Bay weather in October
October in Half Moon Bay: nice, a little rain, with clean air — a great time to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#5 of 12 months in Half Moon Bay · #574 of 1413 destinations to visit in October · comfort 79/100 (tier B)
- Days
- 21°C
- Nights
- 11°C
- Wet days
- 2
- Sun
- 9.6 h
- Humidity
- 79%
- Daylight
- 11 h
Traveller notes on Half Moon Bay in October
Notes from nearby San Francisco (35 km away)
Half Moon Bay doesn't have its own notes for October yet — these are about San Francisco, close enough to share the season.
San Francisco's forum rates October as one of the nicest months of the year — an average high near 70°F with comparatively little fog or rain compared to summer. Regulars flag the city's microclimates as the real variable: neighborhoods near the bay or ocean stay cooler and windier while inland pockets like the Mission run noticeably sunnier, so days can swing from the 50s to 80s°F depending on where in the city you are.
Add your own note from Half Moon Bay's card on the map.
Half Moon Bay climate normals — October
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Half Moon Bay in October
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonan ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Half Moon Bay's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherHalf Moon Bay's weather peaks July–September.
Best weatherFair weatherToughest weather
Nearby, and something's on
Within 300 km of Half Moon Bay — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Half Moon Bay?
Half Moon Bay in October — FAQ
- Is October a good time to visit Half Moon Bay?
- October in Half Moon Bay: nice, a little rain, with clean air — a great time to visit. It ranks #5 of 12 months for Half Moon Bay on SeasonMap's comfort score (79/100).
- What is the weather like in Half Moon Bay in October?
- In October, Half Moon Bay averages a daily high of 21.1°C and a low of 11.2°C, with about 39.3 mm of rain over roughly 2.4 rainy days.
- What is the air quality in Half Moon Bay in October?
- Half Moon Bay has a mean US Air Quality Index of about 47 in October.
Within 300 km: San Francisco's Hardly Strictly Bluegrass on 2–4 Oct, and Santa Cruz, California's Monarch butterflies around 15 Oct – 15 Feb.