Half Moon Bay, CA weather and climate
San Mateo County, CA · population 11,454 · about 33 ft elevation
Everything below is a 30 year average for 1991-2020, computed from daily climate history at Half Moon Bay's own coordinates.
The year at a glance
- Sunny days
- 234
- clear or partly cloudy, per year
- Precipitation
- 26 in
- per year
- Wet days
- 116
- rain or snow per year
- Snowfall
- 0 in
- per year
- Hot days
- 0
- above 90 °F
- Freezing nights
- 4
- at or below 32 °F
- Humidity
- 80%
- average relative
- Average temperature
- 55 °F
- year round
Monthly temperatures
Average daily high and low for each month, in °F.
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daily high | 59 | 60 | 60 | 61 | 62 | 64 | 65 | 66 | 67 | 66 | 63 | 59 |
| Daily low | 43 | 43 | 44 | 45 | 48 | 50 | 53 | 54 | 51 | 48 | 45 | 43 |
Monthly precipitation
Total rain plus melted snow for each month, in inches.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Half Moon Bay | 5.0 | 5.3 | 4.1 | 2.1 | 1.0 | 0.2 | 0.0 | 0.0 | 0.1 | 1.2 | 2.5 | 4.7 |
Monthly sunny days
Days each month with clear or partly cloudy skies.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Half Moon Bay | 13 | 13 | 15 | 18 | 20 | 23 | 26 | 25 | 26 | 23 | 18 | 15 |
Compare Half Moon Bay with another city
Nearby cities and popular picks. Any two cities can be compared from the home page.
- Half Moon Bay vs El Granada, CA
- Half Moon Bay vs Hillsborough, CA
- Half Moon Bay vs Belmont, CA
- Half Moon Bay vs Millbrae, CA
- Half Moon Bay vs Burlingame, CA
- Half Moon Bay vs San Mateo, CA
- Half Moon Bay vs New York, NY
- Half Moon Bay vs Los Angeles, CA
- Half Moon Bay vs Chicago, IL
- Half Moon Bay vs Houston, TX
- Half Moon Bay vs Phoenix, AZ
- Half Moon Bay vs Philadelphia, PA
About this data
Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).
Citing this page
Writing about Half Moon Bay's climate in a report or paper? Cite this page directly. The reference period is part of the citation, so it stays accurate even as individual numbers are refined; add an access date in whatever citation style you use.
VSWeather. Half Moon Bay, CA weather and climate: 1991-2020 climate normals. https://vsweather.com/weather/half-moon-bay-ca/. Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals.
BibTeX entry
@misc{vsweather_half_moon_bay_ca,
author = {{VSWeather}},
title = {Half Moon Bay, CA weather and climate: 1991-2020 climate normals},
howpublished = {\url{https://vsweather.com/weather/half-moon-bay-ca/}},
note = {Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals}
}How to cite VSWeather explains the sources and verification behind these numbers.