Weather in Altadena, CA
Altadena, Thursday, 15 October, 11:43
Clear. Feels like 81°. High 84°, low 56°.
Monthly outlook for Altadena, CA: average high 72.7°, average low 56.6°. That is 2.8° below the climate normal for October. Precipitation is expected on 2 days (about 0.5 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 16 October (90.1°), the coolest 26 October (48.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 76.8° | 78.9° | -1.1° |
| 25 October – 3 November | 65.9° | 75.7° | -5.4° |
| 4 November – 13 November | at normal | 72.3° | — |
October records over 66 years
0Altadena, Friday, 16 October
Clear. High 90°, low 69°.
0Altadena, Saturday, 17 October
Clear. High 82°, low 62°.
0Altadena, Sunday, 18 October
Clear. High 78°, low 62°.
0Altadena, Monday, 19 October
Clear. High 75°, low 59°.
0.02
Altadena, Tuesday, 20 October
Light rain. High 72°, low 56°.
0.48Altadena, Wednesday, 21 October
Light rain. High 61°, low 54°.
0Altadena, Thursday, 22 October
Clear. High 70°, low 54°.
0Altadena, Friday, 23 October
Clear. High 76°, low 59°.
0Altadena, Saturday, 24 October
Clear. High 80°, low 65°.
0
Altadena, Sunday, 25 October
Overcast. High 67°, low 52°.
0.04Altadena, Monday, 26 October
Light rain. High 58°, low 48°.
0Altadena, Tuesday, 27 October
Clear. High 62°, low 50°.
0Altadena, Wednesday, 28 October
Overcast. High 67°, low 52°.
0Altadena, Thursday, 29 October
Clear. High 69°, low 53°.
0
Altadena, Friday, 30 October
Partly cloudy. High 73°, low 56°.
0.02
Altadena, Saturday, 31 October
Climate normal for this date — 60-year average.
0.04Altadena, Sunday, 1 November
Climate normal for this date — 60-year average.
0.01Altadena, Monday, 2 November
Climate normal for this date — 60-year average.
0Altadena, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.02Altadena, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.01Altadena, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Altadena, Friday, 6 November
Climate normal for this date — 60-year average.
0.08Altadena, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Altadena, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Altadena, Monday, 9 November
Climate normal for this date — 60-year average.
0.03Altadena, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.06Altadena, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.02Altadena, Thursday, 12 November
Climate normal for this date — 60-year average.
0.03Altadena, Friday, 13 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 Altadena, 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 Altadena, 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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