Weather in Altadena, CA
Altadena, Saturday, 17 October, 11:59
Overcast. Feels like 82°. High 85°, low 71°.
Monthly outlook for Altadena, CA: average high 72.2°, average low 58.4°. That is 2.8° below the climate normal for October. Precipitation is expected on 3 days (about 1.3 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 18 October (87.7°), the coolest 22 October (50.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 74.6° | 78.4° | -2.1° |
| 27 October – 5 November | 68.1° | 75.2° | -3.9° |
| 6 November – 15 November | at normal | 71.5° | — |
October records over 66 years
0
Altadena, Sunday, 18 October
Clear. High 88°, low 70°.
0Altadena, Monday, 19 October
Clear. High 76°, low 59°.
0Altadena, Tuesday, 20 October
Clear. High 73°, low 57°.
0.36
Altadena, Wednesday, 21 October
Rain. High 64°, low 53°.
0.06Altadena, Thursday, 22 October
Light rain. High 62°, low 51°.
0
Altadena, Friday, 23 October
Partly cloudy. High 70°, low 52°.
0Altadena, Saturday, 24 October
Clear. High 78°, low 60°.
0Altadena, Sunday, 25 October
Overcast. High 73°, low 62°.
0Altadena, Monday, 26 October
Clear. High 78°, low 60°.
0Altadena, Tuesday, 27 October
Partly cloudy. High 78°, low 64°.
0Altadena, Wednesday, 28 October
Overcast. High 72°, low 61°.
0.02Altadena, Thursday, 29 October
Light rain. High 67°, low 55°.
0Altadena, Friday, 30 October
Partly cloudy. High 68°, low 52°.
0Altadena, Saturday, 31 October
Overcast. High 66°, low 56°.
0.9Altadena, Sunday, 1 November
Rain. High 58°, low 51°.
0.01
Altadena, 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.
0.05Altadena, Saturday, 14 November
Climate normal for this date — 60-year average.
0.06Altadena, Sunday, 15 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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