Warm-summer Mediterranean climate
Climate Half Moon Bay - California
Annual high62ºF
Annual low46ºF
Precipitation29 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 59 | 42 | 5.53 |
| Feb | 60 | 42 | 5.19 |
| Mar | 60 | 43 | 4.22 |
| Apr | 60 | 43 | 1.90 |
| May | 61 | 47 | 0.98 |
| Jun | 64 | 49 | 0.29 |
| Jul | 65 | 52 | 0.14 |
| Aug | 66 | 52 | 0.22 |
| Sep | 66 | 50 | 0.37 |
| Oct | 66 | 47 | 1.56 |
| Nov | 62 | 44 | 3.32 |
| Dec | 59 | 42 | 5.28 |
- JanHigh 59ºFLow 42ºFPrecip 5.53 inch
- FebHigh 60ºFLow 42ºFPrecip 5.19 inch
- MarHigh 60ºFLow 43ºFPrecip 4.22 inch
- AprHigh 60ºFLow 43ºFPrecip 1.90 inch
- MayHigh 61ºFLow 47ºFPrecip 0.98 inch
- JunHigh 64ºFLow 49ºFPrecip 0.29 inch
- JulHigh 65ºFLow 52ºFPrecip 0.14 inch
- AugHigh 66ºFLow 52ºFPrecip 0.22 inch
- SepHigh 66ºFLow 50ºFPrecip 0.37 inch
- OctHigh 66ºFLow 47ºFPrecip 1.56 inch
- NovHigh 62ºFLow 44ºFPrecip 3.32 inch
- DecHigh 59ºFLow 42ºFPrecip 5.28 inch
Climate summary
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 weather averages
Annual high62ºF
Annual low46ºF
Precipitation29 inch
Daily normals Half Moon Bay - California - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 58.9 | 43.2 | 0.15 | 0.15 |
| Jan 2 | 59.0 | 43.2 | 0.30 | 0.30 |
| Jan 3 | 59.0 | 43.3 | 0.45 | 0.45 |
| Jan 4 | 59.1 | 43.3 | 0.60 | 0.60 |
| Jan 5 | 59.1 | 43.3 | 0.76 | 0.76 |
| Jan 6 | 59.2 | 43.4 | 0.92 | 0.92 |
| Jan 7 | 59.2 | 43.4 | 1.08 | 1.08 |
| Jan 8 | 59.2 | 43.4 | 1.24 | 1.24 |
| Jan 9 | 59.3 | 43.4 | 1.41 | 1.41 |
| Jan 10 | 59.3 | 43.5 | 1.58 | 1.58 |
| Jan 11 | 59.3 | 43.5 | 1.75 | 1.75 |
| Jan 12 | 59.4 | 43.5 | 1.93 | 1.93 |
| Jan 13 | 59.4 | 43.5 | 2.10 | 2.10 |
| Jan 14 | 59.4 | 43.5 | 2.28 | 2.28 |
| Jan 15 | 59.5 | 43.5 | 2.44 | 2.44 |
| Jan 16 | 59.5 | 43.5 | 2.61 | 2.61 |
| Jan 17 | 59.5 | 43.5 | 2.77 | 2.77 |
| Jan 18 | 59.5 | 43.5 | 2.93 | 2.93 |
| Jan 19 | 59.5 | 43.5 | 3.09 | 3.09 |
| Jan 20 | 59.6 | 43.5 | 3.25 | 3.25 |
| Jan 21 | 59.6 | 43.5 | 3.42 | 3.42 |
| Jan 22 | 59.6 | 43.5 | 3.58 | 3.58 |
| Jan 23 | 59.6 | 43.4 | 3.74 | 3.74 |
| Jan 24 | 59.6 | 43.4 | 3.91 | 3.91 |
| Jan 25 | 59.6 | 43.4 | 4.07 | 4.07 |
| Jan 26 | 59.6 | 43.4 | 4.23 | 4.23 |
| Jan 27 | 59.6 | 43.3 | 4.39 | 4.39 |
| Jan 28 | 59.6 | 43.3 | 4.56 | 4.56 |
| Jan 29 | 59.6 | 43.3 | 4.73 | 4.73 |
| Jan 30 | 59.6 | 43.2 | 4.90 | 4.90 |
| Jan 31 | 59.6 | 43.2 | 5.07 | 5.07 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history Half Moon Bay - October 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Oct 1 | 61.0 | 50.0 | 0.00 |
| Oct 2 | 64.9 | 57.0 | 0.01 |
| Oct 3 | 68.0 | 55.9 | T |
| Oct 4 | – | – | – |
| Oct 5 | – | – | – |
| Oct 6 | – | – | – |
| Oct 7 | 64.9 | 57.0 | T |
| Oct 8 | 64.9 | 57.9 | 0.00 |
| Oct 9 | 64.9 | 60.1 | T |
| Oct 10 | 64.0 | 60.1 | 0.00 |
| Oct 11 | 62.1 | 50.0 | 0.00 |
| Oct 12 | 64.0 | 46.9 | 0.00 |
| Oct 13 | 71.1 | 45.0 | 0.00 |
| Oct 14 | 69.1 | 42.1 | 0.00 |
| Oct 15 | 84.9 | 45.0 | 0.00 |
| Oct 16 | 86.0 | 48.0 | 0.00 |
| Oct 17 | – | – | – |
| Oct 18 | 69.1 | 46.9 | 0.00 |
| Oct 19 | – | – | – |
| Oct 20 | – | – | – |
| Oct 21 | – | – | – |
| Oct 22 | 66.9 | 57.9 | 0.15 |
| Oct 23 | 66.9 | 55.9 | 0.01 |
| Oct 24 | 73.0 | 48.0 | T |
| Oct 25 | 70.0 | 43.0 | 0.00 |
| Oct 26 | 66.9 | 50.0 | 0.00 |
| Oct 27 | 64.9 | 59.0 | 0.00 |
| Oct 28 | 64.9 | 45.0 | 0.00 |
| Oct 29 | 66.0 | 44.1 | 0.00 |
| Oct 30 | – | – | – |
| Oct 31 | – | – | – |
The data for October 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature86.0ºF · Oct 16
- Lowest max temperature61.0ºF · Oct 1
- Highest min temperature60.1ºF · Oct 9
- Lowest min temperature42.1ºF · Oct 14
Geo Half Moon Bay - California
Location
- Country
- United States
- State
- California
- County
- San Mateo
- City
- Half Moon Bay
- Zip Code
- 94019
- Elevation
- 39 ft
- Longitude
- -122.50
- Latitude
- 37.51
- ICAO
- –
- IATA
- –