Weather in Altadena, CA
Altadena, Sunday, 11 October, 17:10
Overcast. Feels like 64°. High 66°, low 58°.
Monthly outlook for Altadena, CA: average high 77.4°, average low 60.4°. That is 0.9° below the climate normal for October. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 17 October (88.4°), the coolest 13 October (44.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 75.1° | 79.7° | -2.5° |
| 21 October – 30 October | 81.3° | 76.7° | +2.5° |
| 31 October – 9 November | at normal | 74° | — |
October records over 66 years
0.46
Altadena, Monday, 12 October
Rain. High 59°, low 52°.
0
Altadena, Tuesday, 13 October
Clear. High 64°, low 44°.
0Altadena, Wednesday, 14 October
Clear. High 70°, low 45°.
0Altadena, Thursday, 15 October
Clear. High 75°, low 55°.
0Altadena, Friday, 16 October
Clear. High 78°, low 60°.
0
Altadena, Saturday, 17 October
Mostly clear. High 88°, low 60°.
0Altadena, Sunday, 18 October
Clear. High 87°, low 71°.
0Altadena, Monday, 19 October
Clear. High 85°, low 70°.
0Altadena, Tuesday, 20 October
Clear. High 79°, low 65°.
0Altadena, Wednesday, 21 October
Clear. High 79°, low 64°.
0Altadena, Thursday, 22 October
Clear. High 82°, low 64°.
0Altadena, Friday, 23 October
Clear. High 82°, low 66°.
0Altadena, Saturday, 24 October
Clear. High 77°, low 63°.
0Altadena, Sunday, 25 October
Clear. High 82°, low 63°.
0Altadena, Monday, 26 October
Clear. High 86°, low 67°.
0.04Altadena, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.02Altadena, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.01Altadena, Thursday, 29 October
Climate normal for this date — 60-year average.
0.05Altadena, Friday, 30 October
Climate normal for this date — 60-year average.
0.02Altadena, 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.
0.09
Altadena, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Altadena, Monday, 9 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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