Weather in Halcyon, CA
Halcyon, Wednesday, 14 October, 11:20
Clear. Feels like 78°. High 81°, low 51°.
Monthly outlook for Halcyon, CA: average high 78.7°, average low 59.6°. That is 4.6° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 16 October (95.8°), the coolest 14 October (51.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 14 October – 23 October | 78° | 71° | +3.8° |
| 24 October – 2 November | 80° | 69.4° | +5.9° |
| 3 November – 12 November | at normal | 67.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Grover Beach (2 mi).
0Halcyon, Thursday, 15 October
Clear. High 89°, low 55°.
0Halcyon, Friday, 16 October
Clear. High 96°, low 57°.
0Halcyon, Saturday, 17 October
Clear. High 93°, low 68°.
0Halcyon, Sunday, 18 October
Clear. High 80°, low 60°.
0Halcyon, Monday, 19 October
Clear. High 71°, low 56°.
0
Halcyon, Tuesday, 20 October
Partly cloudy. High 66°, low 55°.
0.02
Halcyon, Wednesday, 21 October
Light rain. High 67°, low 58°.
0Halcyon, Thursday, 22 October
Light rain. High 65°, low 58°.
0Halcyon, Friday, 23 October
Clear. High 73°, low 56°.
0Halcyon, Saturday, 24 October
Partly cloudy. High 80°, low 61°.
0
Halcyon, Sunday, 25 October
Overcast. High 86°, low 66°.
0Halcyon, Monday, 26 October
Overcast. High 79°, low 62°.
0Halcyon, Tuesday, 27 October
Overcast. High 75°, low 62°.
0Halcyon, Wednesday, 28 October
Clear. High 81°, low 65°.
0Halcyon, Thursday, 29 October
Clear. High 79°, low 64°.
0.07
Halcyon, 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.
0.1Halcyon, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.04Halcyon, Thursday, 12 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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