Weather in Alta Loma, CA
Alta Loma, Sunday, 9 August, 03:43
Mostly clear. Feels like 81°. High 100°, low 75°.
Monthly outlook for Alta Loma, CA: average high 89.4°, average low 72.2°. That is 0.4° below the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (99.6°), the coolest 14 August (69.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 88.3° | 90.4° | -1.2° |
| 19 August – 28 August | 91.1° | 90.4° | +0.4° |
| 29 August – 7 September | at normal | 91.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Rancho Cucamonga (2 mi).
0
Alta Loma, Monday, 10 August
Partly cloudy. High 96°, low 71°.
0Alta Loma, Tuesday, 11 August
Partly cloudy. High 92°, low 75°.
0Alta Loma, Wednesday, 12 August
Partly cloudy. High 88°, low 73°.
0
Alta Loma, Thursday, 13 August
Clear. High 85°, low 70°.
0
Alta Loma, Friday, 14 August
Overcast. High 84°, low 69°.
0.04
Alta Loma, Saturday, 15 August
Light rain. High 78°, low 69°.
0Alta Loma, Sunday, 16 August
Overcast. High 85°, low 69°.
0Alta Loma, Monday, 17 August
Overcast. High 87°, low 71°.
0Alta Loma, Tuesday, 18 August
Overcast. High 89°, low 72°.
0Alta Loma, Wednesday, 19 August
Overcast. High 89°, low 74°.
0
Alta Loma, Thursday, 20 August
Mostly clear. High 91°, low 73°.
0Alta Loma, Friday, 21 August
Partly cloudy. High 91°, low 74°.
0Alta Loma, Saturday, 22 August
Clear. High 92°, low 75°.
0Alta Loma, Sunday, 23 August
Clear. High 91°, low 74°.
0Alta Loma, Monday, 24 August
Clear. High 92°, low 74°.
0Alta Loma, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Alta Loma, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Alta Loma, Thursday, 27 August
Climate normal for this date — 60-year average.
0Alta Loma, Friday, 28 August
Climate normal for this date — 60-year average.
0Alta Loma, Saturday, 29 August
Climate normal for this date — 60-year average.
0Alta Loma, Sunday, 30 August
Climate normal for this date — 60-year average.
0Alta Loma, Monday, 31 August
Climate normal for this date — 60-year average.
0Alta Loma, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.02Alta Loma, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.01Alta Loma, Thursday, 3 September
Climate normal for this date — 60-year average.
0Alta Loma, Friday, 4 September
Climate normal for this date — 60-year average.
0.01Alta Loma, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Alta Loma, Sunday, 6 September
Climate normal for this date — 60-year average.
0Alta Loma, Monday, 7 September
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 Alta Loma, 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 Alta Loma, 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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