Climate Half Moon Bay - California
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 59 | 60 | 60 | 60 | 61 | 64 |
| Average low in ºF Av. low Lo | 42 | 42 | 43 | 43 | 47 | 49 |
| Av. precipitation in inch Av. precip. Pre. | 5.53 | 5.19 | 4.22 | 1.90 | 0.98 | 0.29 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 65 | 66 | 66 | 66 | 62 | 59 |
| Average low in ºF Av. low Lo | 52 | 52 | 50 | 47 | 44 | 42 |
| Av. precipitation in inch Av. precip. Pre. | 0.14 | 0.22 | 0.37 | 1.56 | 3.32 | 5.28 |
What is the average weather in Half Moon Bay, California?
Half Moon Bay experiences a warm-summer climate with a strong coastal influence. Summers are notably dry and cool, while winters bring moderate precipitation and cool temperatures. The warmest period arrives later in the year, with September standing out as the warmest month, which is an atypical pattern for the U.S.
Half Moon Bay Climate Graph - California Climate Chart
Daily normals Half Moon Bay - California - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 58.9 | 43.2 | 0.15 | 0.15 | 0.00 | 0.00 |
| 2 Jan | 59.0 | 43.2 | 0.30 | 0.30 | 0.00 | 0.00 |
| 3 Jan | 59.0 | 43.3 | 0.45 | 0.45 | 0.00 | 0.00 |
| 4 Jan | 59.1 | 43.3 | 0.60 | 0.60 | 0.00 | 0.00 |
| 5 Jan | 59.1 | 43.3 | 0.76 | 0.76 | 0.00 | 0.00 |
| 6 Jan | 59.2 | 43.4 | 0.92 | 0.92 | 0.00 | 0.00 |
| 7 Jan | 59.2 | 43.4 | 1.08 | 1.08 | 0.00 | 0.00 |
| 8 Jan | 59.2 | 43.4 | 1.24 | 1.24 | 0.00 | 0.00 |
| 9 Jan | 59.3 | 43.4 | 1.41 | 1.41 | 0.00 | 0.00 |
| 10 Jan | 59.3 | 43.5 | 1.58 | 1.58 | 0.00 | 0.00 |
| 11 Jan | 59.3 | 43.5 | 1.75 | 1.75 | 0.00 | 0.00 |
| 12 Jan | 59.4 | 43.5 | 1.93 | 1.93 | 0.00 | 0.00 |
| 13 Jan | 59.4 | 43.5 | 2.10 | 2.10 | 0.00 | 0.00 |
| 14 Jan | 59.4 | 43.5 | 2.28 | 2.28 | 0.00 | 0.00 |
| 15 Jan | 59.5 | 43.5 | 2.44 | 2.44 | 0.00 | 0.00 |
| 16 Jan | 59.5 | 43.5 | 2.61 | 2.61 | 0.00 | 0.00 |
| 17 Jan | 59.5 | 43.5 | 2.77 | 2.77 | 0.00 | 0.00 |
| 18 Jan | 59.5 | 43.5 | 2.93 | 2.93 | 0.00 | 0.00 |
| 19 Jan | 59.5 | 43.5 | 3.09 | 3.09 | 0.00 | 0.00 |
| 20 Jan | 59.6 | 43.5 | 3.25 | 3.25 | 0.00 | 0.00 |
| 21 Jan | 59.6 | 43.5 | 3.42 | 3.42 | 0.00 | 0.00 |
| 22 Jan | 59.6 | 43.5 | 3.58 | 3.58 | 0.00 | 0.00 |
| 23 Jan | 59.6 | 43.4 | 3.74 | 3.74 | 0.00 | 0.00 |
| 24 Jan | 59.6 | 43.4 | 3.91 | 3.91 | 0.00 | 0.00 |
| 25 Jan | 59.6 | 43.4 | 4.07 | 4.07 | 0.00 | 0.00 |
| 26 Jan | 59.6 | 43.4 | 4.23 | 4.23 | 0.00 | 0.00 |
| 27 Jan | 59.6 | 43.3 | 4.39 | 4.39 | 0.00 | 0.00 |
| 28 Jan | 59.6 | 43.3 | 4.56 | 4.56 | 0.00 | 0.00 |
| 29 Jan | 59.6 | 43.3 | 4.73 | 4.73 | 0.00 | 0.00 |
| 30 Jan | 59.6 | 43.2 | 4.90 | 4.90 | 0.00 | 0.00 |
| 31 Jan | 59.6 | 43.2 | 5.07 | 5.07 | 0.00 | 0.00 |
Weather history Half Moon Bay - September 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Sep | 66.0 | 57.0 | 0.00 | - | - |
| 02 Sep | 69.1 | 54.0 | 0.00 | - | - |
| 03 Sep | 69.1 | 55.9 | 0.00 | - | - |
| 04 Sep | 69.1 | 54.0 | 0.11 | - | - |
| 05 Sep | 66.9 | 50.0 | 0.00 | - | - |
| 06 Sep | - | - | - | - | - |
| 07 Sep | - | - | - | - | - |
| 08 Sep | - | - | - | - | - |
| 09 Sep | - | - | - | - | - |
| 10 Sep | - | - | - | - | - |
| 11 Sep | - | - | - | - | - |
| 12 Sep | - | - | - | - | - |
| 13 Sep | - | - | - | - | - |
| 14 Sep | - | - | - | - | - |
| 15 Sep | - | - | - | - | - |
| 16 Sep | - | - | - | - | - |
| 17 Sep | - | - | - | - | - |
| 18 Sep | - | - | - | - | - |
| 19 Sep | - | - | - | - | - |
| 20 Sep | - | - | - | - | - |
| 21 Sep | - | - | - | - | - |
| 22 Sep | - | - | - | - | - |
| 23 Sep | - | - | - | - | - |
| 24 Sep | - | - | - | - | - |
| 25 Sep | - | - | - | - | - |
| 26 Sep | - | - | - | - | - |
| 27 Sep | - | - | - | - | - |
| 28 Sep | - | - | - | - | - |
| 29 Sep | - | - | - | - | - |
| 30 Sep | - | - | - | - | - |
Past weather Half Moon Bay
| Sep 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 68.0 ºF | 59 ºF | |
| Average low temperature Av. low temp. | 54.2 ºF | 42 ºF | |
| Total precipitation Total precip. | 0.11 inch | 5.53 inch | |
| Total snowfall Total snowfall | - inch | 0 inch | |
| Highest max temperature Highest max temp. | 69.1 ºF | - | |
| Lowest max temperature Lowest max temp. | 66.0 ºF | - | |
| Highest min temperature Highest min temp. | 57.0 ºF | - | |
| Lowest min temperature Lowest min temp. | 50.0 ºF | - | |
Past weather September 2026 incomplete - Missing data
Geo Half Moon Bay - California
| Country | United States | |
|---|---|---|
| State | California | |
| County | San Mateo | |
| City | Half Moon Bay | |
| Zip Code | 94019 | |
| Longitude | -122.5 dec. degr. | |
| Latitude | 37.51 dec. degr. | |
| Altitude - Elevation | 39ft | |
| ICAO | - | |
| IATA | - |
Date and Time Half Moon Bay - California
| Local Time | 07:05 AM | |
|---|---|---|
| Sunrise | 06:45 AM | |
| Sunset | 07:29 PM | |
| Day/Night | Day | |
| Timezone | Pacific Daylight Time | |
| Timezone DB | America - Los Angeles |
Map of Half Moon Bay - California
USGS National Map — Open interactive map
Half Moon Bay weather averages
| Annual high temperature | 62ºF |
| Annual low temperature | 46ºF |
| Average annual precip. | 29 inch |
Station Data
Monthly averages Half Moon Bay
Longitude: -122.501, Latitude: 37.5134
Average weather Half Moon Bay, CA - 94019
Monthly: 1991-2020 normals
History: 2007-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...