Half Moon Bay weather in August: Half Moon Bay, California: normal highs, lows, rain and records for August
Half Moon Bay in August has a normal high of 66°F and a normal low of 54°F, a daily mean of 60°F, holding near 66°F all month. Measurable precipitation falls on 8 days in a normal August, 0.23 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 19°C and low of 12°C, 6 mm of precipitation in August.
- 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 August?
The normal high is 66°F and the normal low 54°F, for a daily mean of 59.7°F. August is 0.9°F warmer than July and 0.9°F warmer than September. August is the warmest month of the year in Half Moon Bay and the 10th wettest. Across the month the normal high rises 1°F, from 65°F on August 1 to 66°F on August 31. From one year to the next August's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 58°F and 61°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 26%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 65°F | 54°F | 26% | 1% |
| August 8 | 65°F | 54°F | 25% | 1% |
| August 15 | 66°F | 54°F | 24% | 1% |
| August 22 | 66°F | 54°F | 22% | 1% |
| August 31 | 66°F | 53°F | 20% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 29, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 65°F | 54°F | 26% | 1% | 14 h 10 min |
| August 2 | 65°F | 54°F | 26% | 1% | 14 h |
| August 3 | 65°F | 54°F | 26% | 1% | 14 h |
| August 4 | 65°F | 54°F | 26% | 1% | 14 h |
| August 5 | 65°F | 54°F | 26% | 1% | 14 h |
| August 6 | 65°F | 54°F | 26% | 1% | 14 h |
| August 7 | 65°F | 54°F | 26% | 1% | 14 h |
| August 8 | 65°F | 54°F | 25% | 1% | 13 h 50 min |
| August 9 | 65°F | 54°F | 25% | 1% | 13 h 50 min |
| August 10 | 65°F | 54°F | 25% | 1% | 13 h 50 min |
| August 11 | 66°F | 54°F | 25% | 1% | 13 h 50 min |
| August 12 | 66°F | 54°F | 24% | 1% | 13 h 50 min |
| August 13 | 66°F | 54°F | 24% | 1% | 13 h 40 min |
| August 14 | 66°F | 54°F | 24% | 1% | 13 h 40 min |
| August 15 | 66°F | 54°F | 24% | 1% | 13 h 40 min |
| August 16 | 66°F | 54°F | 23% | 1% | 13 h 40 min |
| August 17 | 66°F | 54°F | 23% | 1% | 13 h 30 min |
| August 18 | 66°F | 54°F | 23% | 1% | 13 h 30 min |
| August 19 | 66°F | 54°F | 23% | 1% | 13 h 30 min |
| August 20 | 66°F | 54°F | 22% | 1% | 13 h 30 min |
| August 21 | 66°F | 54°F | 22% | 1% | 13 h 30 min |
| August 22 | 66°F | 54°F | 22% | 1% | 13 h 20 min |
| August 23 | 66°F | 54°F | 22% | 1% | 13 h 20 min |
| August 24 | 66°F | 54°F | 21% | 1% | 13 h 20 min |
| August 25 | 66°F | 54°F | 21% | 1% | 13 h 20 min |
| August 26 | 66°F | 53°F | 21% | 1% | 13 h 20 min |
| August 27 | 66°F | 53°F | 21% | 1% | 13 h 10 min |
| August 28 | 66°F | 53°F | 21% | 1% | 13 h 10 min |
| August 29 | 66°F | 53°F | 21% | 1% | 13 h 10 min |
| August 30 | 66°F | 53°F | 21% | 1% | 13 h 10 min |
| August 31 | 66°F | 53°F | 20% | 1% | 13 h |
- Normal high
- 66°FAugust average
- Normal low
- 54°FAugust average
- Precipitation
- 0.23 inmonth total
- Days with precipitation
- 80.01 inch or more
- Daylight
- 14 h 10 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 4
- Sunshine
- 77%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 August?
On a given August day the chance of 0.01 inch or more is 23% on average, highest around August 4 (26%). In all, 0.23 in falls on 8 days of a normal August.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043714.
What are the records for August in Half Moon Bay?
The warmest August temperature on this station's record (since 1939) is 84°F, on August 13, 1965; the coldest is 41°F, on August 9, 1975. The wettest August brought 1.56 in (1976).
The August mean against the 1991-2020 normal of 59.7°F: 2021 60.3°F (+0.6), 2022 60.2°F (+0.5), 2023 60.2°F (+0.5), 2024 58.9°F (−0.8), 2025 60.3°F (+0.6), 2026 60.9°F (+1.2). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.3°F | +0.6°F | 0.07 in |
| 2022 | 60.2°F | +0.5°F | 0.17 in |
| 2023 | 60.2°F | +0.5°F | 0.26 in |
| 2024 | 58.9°F | −0.8°F | 0.12 in |
| 2025 | 60.3°F | +0.6°F | 0.26 in |
| 2026 | 60.9°F | +1.2°F | 0.19 in |
Source: records: ACIS, station USC00043714; recent months: ACIS, station USC00043714. Records and recent months use complete months only.
How does August in Half Moon Bay compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; 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 July65°F by day, 53°F at night
- Half Moon Bay in September66°F by day, 51°F at night
- Half Moon Bay through the yearEvery month, frost dates, records and recent years
- California in AugustThe statewide normal and the warmest and coolest places
- Needles: California's warmest Augustnormal high 109°F