Weather in Half Moon Bay, CA
Half Moon Bay, Saturday, 8 August, 22:19
Partly cloudy. Feels like 60°. High 85°, low 59°.
Monthly outlook for Half Moon Bay, CA: average high 69°, average low 57.1°. That is 2.9° below the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (88.2°), the coolest 11 August (55.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 71.5° | 74.5° | -1.6° |
| 18 August – 27 August | 64.7° | 74° | -5.2° |
| 28 August – 6 September | at normal | 75.7° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Belmont (8 mi).
0
Half Moon Bay, Sunday, 9 August
Partly cloudy. High 88°, low 62°.
0Half Moon Bay, Monday, 10 August
Partly cloudy. High 78°, low 56°.
0
Half Moon Bay, Tuesday, 11 August
Mostly clear. High 67°, low 56°.
0
Half Moon Bay, Wednesday, 12 August
Overcast. High 65°, low 57°.
0Half Moon Bay, Thursday, 13 August
Overcast. High 66°, low 57°.
0Half Moon Bay, Friday, 14 August
Mostly clear. High 65°, low 56°.
0Half Moon Bay, Saturday, 15 August
Mostly clear. High 67°, low 57°.
0Half Moon Bay, Sunday, 16 August
Overcast. High 67°, low 57°.
0Half Moon Bay, Monday, 17 August
Overcast. High 66°, low 58°.
0Half Moon Bay, Tuesday, 18 August
Mostly clear. High 66°, low 56°.
0Half Moon Bay, Wednesday, 19 August
Partly cloudy. High 65°, low 56°.
0Half Moon Bay, Thursday, 20 August
Overcast. High 62°, low 57°.
0Half Moon Bay, Friday, 21 August
Mostly clear. High 65°, low 57°.
0Half Moon Bay, Saturday, 22 August
Overcast. High 65°, low 57°.
0Half Moon Bay, Sunday, 23 August
Partly cloudy. High 65°, low 56°.
0Half Moon Bay, Monday, 24 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Thursday, 27 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Friday, 28 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Saturday, 29 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Sunday, 30 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Monday, 31 August
Climate normal for this date — 60-year average.
0Half Moon Bay, Tuesday, 1 September
Climate normal for this date — 60-year average.
0Half Moon Bay, Wednesday, 2 September
Climate normal for this date — 60-year average.
0Half Moon Bay, Thursday, 3 September
Climate normal for this date — 60-year average.
0Half Moon Bay, Friday, 4 September
Climate normal for this date — 60-year average.
0Half Moon Bay, Saturday, 5 September
Climate normal for this date — 60-year average.
0Half Moon Bay, Sunday, 6 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Half Moon Bay, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Half Moon Bay, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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