Weather in Rancho Cucamonga, CA
Rancho Cucamonga, Sunday, 9 August, 02:23
Mostly clear. Feels like 82°. High 100°, low 74°.
Monthly outlook for Rancho Cucamonga, CA: average high 90.1°, average low 72.7°. That is 0° above 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 (100.1°), the coolest 16 August (69.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 89° | 90.4° | -0.8° |
| 19 August – 28 August | 91.9° | 90.4° | +0.9° |
| 29 August – 7 September | at normal | 91.4° | — |
August records over 66 years
0
Rancho Cucamonga, Monday, 10 August
Partly cloudy. High 96°, low 71°.
0Rancho Cucamonga, Tuesday, 11 August
Partly cloudy. High 93°, low 76°.
0Rancho Cucamonga, Wednesday, 12 August
Partly cloudy. High 89°, low 73°.
0
Rancho Cucamonga, Thursday, 13 August
Clear. High 86°, low 70°.
0
Rancho Cucamonga, Friday, 14 August
Overcast. High 84°, low 70°.
0.03
Rancho Cucamonga, Saturday, 15 August
Light rain. High 78°, low 70°.
0Rancho Cucamonga, Sunday, 16 August
Overcast. High 86°, low 70°.
0Rancho Cucamonga, Monday, 17 August
Overcast. High 88°, low 71°.
0Rancho Cucamonga, Tuesday, 18 August
Overcast. High 90°, low 73°.
0Rancho Cucamonga, Wednesday, 19 August
Overcast. High 90°, low 74°.
0Rancho Cucamonga, Thursday, 20 August
Partly cloudy. High 92°, low 73°.
0Rancho Cucamonga, Friday, 21 August
Partly cloudy. High 92°, low 74°.
0Rancho Cucamonga, Saturday, 22 August
Clear. High 93°, low 75°.
0Rancho Cucamonga, Sunday, 23 August
Clear. High 91°, low 74°.
0Rancho Cucamonga, Monday, 24 August
Clear. High 93°, low 74°.
0
Rancho Cucamonga, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Thursday, 27 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Friday, 28 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Saturday, 29 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Sunday, 30 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Monday, 31 August
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.02Rancho Cucamonga, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.01Rancho Cucamonga, Thursday, 3 September
Climate normal for this date — 60-year average.
0Rancho Cucamonga, Friday, 4 September
Climate normal for this date — 60-year average.
0.01Rancho Cucamonga, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Rancho Cucamonga, Sunday, 6 September
Climate normal for this date — 60-year average.
0Rancho Cucamonga, 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 Rancho Cucamonga, 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 Rancho Cucamonga, 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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