Weather in Altadena, CA
Altadena, Thursday, 15 October, 18:52
Clear. Feels like 80°. High 85°, low 56°.
Monthly outlook for Altadena, CA: average high 75.5°, average low 58.3°. That is 1.2° below the climate normal for October. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 1 days and 0.4 inches. The warmest day looks like 16 October (90°), the coolest 21 October (45.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 75.4° | 78.9° | -1.9° |
| 25 October – 3 November | 75.7° | 75.7° | +0° |
| 4 November – 13 November | at normal | 72.3° | — |
October records over 66 years
0
Altadena, Friday, 16 October
Clear. High 90°, low 65°.
0Altadena, Saturday, 17 October
Clear. High 86°, low 63°.
0Altadena, Sunday, 18 October
Clear. High 79°, low 62°.
0Altadena, Monday, 19 October
Clear. High 76°, low 58°.
0.28
Altadena, Tuesday, 20 October
Rain. High 60°, low 48°.
0.16Altadena, Wednesday, 21 October
Light rain. High 61°, low 46°.
0
Altadena, Thursday, 22 October
Mostly clear. High 65°, low 54°.
0Altadena, Friday, 23 October
Clear. High 72°, low 56°.
0Altadena, Saturday, 24 October
Clear. High 80°, low 62°.
0Altadena, Sunday, 25 October
Clear. High 78°, low 60°.
0Altadena, Monday, 26 October
Clear. High 80°, low 61°.
0Altadena, Tuesday, 27 October
Clear. High 78°, low 62°.
0
Altadena, Wednesday, 28 October
Overcast. High 74°, low 64°.
0Altadena, Thursday, 29 October
Overcast. High 72°, low 60°.
0Altadena, Friday, 30 October
Clear. High 71°, low 58°.
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.
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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