Weather in Ontario, CA
Ontario, Saturday, 8 August, 16:08
Clear. Feels like 103°. High 101°, low 69°.
Monthly outlook for Ontario, CA: average high 95°, average low 76.2°. That is 3.1° 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 8 August (100.5°), the coolest 8 August (69°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 94.6° | 89.8° | +2.6° |
| 18 August – 27 August | 95.6° | 89.4° | +3.5° |
| 28 August – 6 September | at normal | 91.3° | — |
August records over 66 years
0Ontario, Sunday, 9 August
Clear. High 98°, low 73°.
0
Ontario, Monday, 10 August
Partly cloudy. High 97°, low 73°.
0
Ontario, Tuesday, 11 August
Overcast. High 93°, low 77°.
0Ontario, Wednesday, 12 August
Overcast. High 92°, low 77°.
0Ontario, Thursday, 13 August
Partly cloudy. High 90°, low 73°.
0Ontario, Friday, 14 August
Overcast. High 89°, low 73°.
0
Ontario, Saturday, 15 August
Mostly clear. High 94°, low 74°.
0Ontario, Sunday, 16 August
Mostly clear. High 96°, low 77°.
0Ontario, Monday, 17 August
Mostly clear. High 96°, low 77°.
0Ontario, Tuesday, 18 August
Clear. High 98°, low 81°.
0Ontario, Wednesday, 19 August
Clear. High 99°, low 82°.
0Ontario, Thursday, 20 August
Partly cloudy. High 97°, low 80°.
0Ontario, Friday, 21 August
Overcast. High 96°, low 79°.
0.01
Ontario, Saturday, 22 August
Light rain. High 91°, low 78°.
0Ontario, Sunday, 23 August
Mostly clear. High 93°, low 76°.
0Ontario, Monday, 24 August
Climate normal for this date — 60-year average.
0Ontario, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Ontario, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Ontario, Thursday, 27 August
Climate normal for this date — 60-year average.
0Ontario, Friday, 28 August
Climate normal for this date — 60-year average.
0Ontario, Saturday, 29 August
Climate normal for this date — 60-year average.
0Ontario, Sunday, 30 August
Climate normal for this date — 60-year average.
0Ontario, Monday, 31 August
Climate normal for this date — 60-year average.
0.02Ontario, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.03Ontario, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.01Ontario, Thursday, 3 September
Climate normal for this date — 60-year average.
0Ontario, Friday, 4 September
Climate normal for this date — 60-year average.
0.01Ontario, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Ontario, Sunday, 6 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 Ontario, 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 Ontario, 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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