Half Moon Bay weather in October: Half Moon Bay, California: normal highs, lows, rain and records for October
Half Moon Bay in October has a normal high of 66°F and a normal low of 48°F, a daily mean of 57°F, falling from 67°F on the 1st to 65°F by the 31st. Measurable precipitation falls on 8 days in a normal October, 1.26 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 9°C, 32 mm of precipitation in October.
- NOAA stationHalf Moon Bay
- Station IDUSC00043714
- Location37.47°N 122.44°W
- Elevation27 ft (8 m)
- Population11,324
- Jan 59° 43°
- Feb 60° 43°
- Mar 60° 44°
- Apr 61° 45°
- May 62° 48°
- Jun 64° 50°
- Jul 65° 53°
- Aug 66° 54°
- Sep 66° 51°
- Oct 66° 48°
- Nov 63° 45°
- Dec 59° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Half Moon Bay in October?
The normal high is 66°F and the normal low 48°F, for a daily mean of 57.1°F. October is 1.7°F cooler than September and 3.4°F warmer than November. October is the 4th warmest month of the year in Half Moon Bay and the 7th wettest. Across the month the normal high falls 2°F, from 67°F on October 1 to 65°F on October 31. From one year to the next October's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 56°F and 59°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 67°F | 50°F | 23% | 3% |
| October 8 | 67°F | 49°F | 24% | 5% |
| October 15 | 67°F | 48°F | 25% | 7% |
| October 22 | 66°F | 47°F | 27% | 9% |
| October 31 | 65°F | 46°F | 31% | 12% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 67°F | 50°F | 23% | 3% | 11 h 50 min |
| October 2 | 67°F | 49°F | 23% | 4% | 11 h 50 min |
| October 3 | 67°F | 49°F | 23% | 4% | 11 h 50 min |
| October 4 | 67°F | 49°F | 23% | 4% | 11 h 40 min |
| October 5 | 67°F | 49°F | 23% | 4% | 11 h 40 min |
| October 6 | 67°F | 49°F | 23% | 4% | 11 h 40 min |
| October 7 | 67°F | 49°F | 24% | 5% | 11 h 40 min |
| October 8 | 67°F | 49°F | 24% | 5% | 11 h 30 min |
| October 9 | 67°F | 49°F | 24% | 5% | 11 h 30 min |
| October 10 | 67°F | 49°F | 24% | 5% | 11 h 30 min |
| October 11 | 67°F | 48°F | 24% | 6% | 11 h 30 min |
| October 12 | 67°F | 48°F | 25% | 6% | 11 h 20 min |
| October 13 | 67°F | 48°F | 25% | 6% | 11 h 20 min |
| October 14 | 67°F | 48°F | 25% | 6% | 11 h 20 min |
| October 15 | 67°F | 48°F | 25% | 7% | 11 h 20 min |
| October 16 | 67°F | 48°F | 26% | 7% | 11 h 20 min |
| October 17 | 67°F | 48°F | 26% | 7% | 11 h 10 min |
| October 18 | 67°F | 48°F | 26% | 8% | 11 h 10 min |
| October 19 | 67°F | 48°F | 26% | 8% | 11 h 10 min |
| October 20 | 66°F | 48°F | 27% | 8% | 11 h 10 min |
| October 21 | 66°F | 47°F | 27% | 9% | 11 h |
| October 22 | 66°F | 47°F | 27% | 9% | 11 h |
| October 23 | 66°F | 47°F | 28% | 9% | 11 h |
| October 24 | 66°F | 47°F | 28% | 10% | 11 h |
| October 25 | 66°F | 47°F | 29% | 10% | 10 h 50 min |
| October 26 | 66°F | 47°F | 29% | 11% | 10 h 50 min |
| October 27 | 66°F | 47°F | 29% | 11% | 10 h 50 min |
| October 28 | 66°F | 47°F | 30% | 11% | 10 h 50 min |
| October 29 | 66°F | 47°F | 30% | 12% | 10 h 50 min |
| October 30 | 65°F | 47°F | 30% | 12% | 10 h 40 min |
| October 31 | 65°F | 46°F | 31% | 12% | 10 h 40 min |
- Normal high
- 66°FOctober average
- Normal low
- 48°FOctober average
- Precipitation
- 1.26 inmonth total
- Days with precipitation
- 80.01 inch or more
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 6
- Days at 80°F or more
- 2
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00043714; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Half Moon Bay in October?
On a given October day the chance of 0.01 inch or more is 26% on average, highest around October 31 (31%). In all, 1.26 in falls on 8 days of a normal October.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043714.
What are the records for October in Half Moon Bay?
The warmest October temperature on this station's record (since 1939) is 94°F, on October 27, 2003; the coldest is 33°F, on October 29, 1946. The wettest October brought 10.97 in (1962).
The October mean against the 1991-2020 normal of 57.1°F: 2021 56.4°F (−0.7), 2022 56.3°F (−0.8), 2023 58.1°F (+1.0), 2024 57.4°F (+0.3), 2025 59.1°F (+2.0). 3 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.4°F | −0.7°F | 5.29 in |
| 2022 | 56.3°F | −0.8°F | 0.20 in |
| 2023 | 58.1°F | +1.0°F | 0.34 in |
| 2024 | 57.4°F | +0.3°F | 0.14 in |
| 2025 | 59.1°F | +2.0°F | 1.84 in |
Source: records: ACIS, station USC00043714; recent months: ACIS, station USC00043714. Records and recent months use complete months only.
How does October in Half Moon Bay compare across California?
Across the 219 places PlainClimate covers in California, October normal highs run from 58°F in Tahoma to 93°F in Brawley; Half Moon Bay's is 66°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Half Moon Bay in September66°F by day, 51°F at night
- Half Moon Bay in November63°F by day, 45°F at night
- Half Moon Bay through the yearEvery month, frost dates, records and recent years
- California in OctoberThe statewide normal and the warmest and coolest places
- Brawley: California's warmest Octobernormal high 93°F