Weather in Halcyon, CA
Halcyon, Monday, 12 October, 11:22
Partly cloudy. Feels like 65°. High 68°, low 55°.
Monthly outlook for Halcyon, CA: average high 76.6°, average low 57°. That is 3.1° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 1 days and 0.3 inches. The warmest day looks like 16 October (93.7°), the coolest 14 October (47.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 76.1° | 71.3° | +2.7° |
| 22 October – 31 October | 77.5° | 69.7° | +4.3° |
| 1 November – 10 November | at normal | 67.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Grover Beach (2 mi).
0
Halcyon, Tuesday, 13 October
Clear. High 76°, low 51°.
0Halcyon, Wednesday, 14 October
Clear. High 81°, low 48°.
0Halcyon, Thursday, 15 October
Clear. High 86°, low 51°.
0Halcyon, Friday, 16 October
Clear. High 94°, low 58°.
0Halcyon, Saturday, 17 October
Clear. High 85°, low 66°.
0Halcyon, Sunday, 18 October
Clear. High 75°, low 60°.
0
Halcyon, Monday, 19 October
Mostly clear. High 66°, low 57°.
0Halcyon, Tuesday, 20 October
Clear. High 65°, low 55°.
0.01
Halcyon, Wednesday, 21 October
Light rain. High 64°, low 50°.
0Halcyon, Thursday, 22 October
Clear. High 69°, low 53°.
0Halcyon, Friday, 23 October
Clear. High 69°, low 54°.
0Halcyon, Saturday, 24 October
Clear. High 79°, low 59°.
0Halcyon, Sunday, 25 October
Mostly clear. High 79°, low 61°.
0
Halcyon, Monday, 26 October
Overcast. High 84°, low 65°.
0Halcyon, Tuesday, 27 October
Overcast. High 84°, low 70°.
0.04Halcyon, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.04Halcyon, Thursday, 29 October
Climate normal for this date — 60-year average.
0.07Halcyon, Friday, 30 October
Climate normal for this date — 60-year average.
0.02Halcyon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.02Halcyon, Sunday, 1 November
Climate normal for this date — 60-year average.
0.02Halcyon, Monday, 2 November
Climate normal for this date — 60-year average.
0.01Halcyon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Halcyon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.03Halcyon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Halcyon, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Halcyon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Halcyon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.07Halcyon, Monday, 9 November
Climate normal for this date — 60-year average.
0.05Halcyon, Tuesday, 10 November
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 Halcyon, 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 Halcyon, 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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