Weather in Ontario, CA
Ontario, Tuesday, 20 October, 06:20
Clear. Feels like 63°. High 83°, low 62°.
Monthly outlook for Ontario, CA: average high 76.1°, average low 63.1°. That is 0° above the climate normal for October. Precipitation is expected on 2 days (about 2.4 inches), against a normal of 2 days and 0.5 inches. The warmest day looks like 26 October (86.2°), the coolest 23 October (53.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 20 October – 29 October | 77.4° | 76.8° | +0.3° |
| 30 October – 8 November | 74° | 73.9° | +0.1° |
| 9 November – 18 November | at normal | 70.3° | — |
October records over 66 years
0.04
Ontario, Wednesday, 21 October
Light rain. High 78°, low 58°.
2.27Ontario, Thursday, 22 October
Heavy rain. High 62°, low 54°.
0
Ontario, Friday, 23 October
Partly cloudy. High 65°, low 53°.
0
Ontario, Saturday, 24 October
Clear. High 74°, low 56°.
0Ontario, Sunday, 25 October
Clear. High 75°, low 55°.
0Ontario, Monday, 26 October
Partly cloudy. High 86°, low 65°.
0
Ontario, Tuesday, 27 October
Overcast. High 86°, low 73°.
0Ontario, Wednesday, 28 October
Overcast. High 86°, low 74°.
0Ontario, Thursday, 29 October
Overcast. High 79°, low 69°.
0
Ontario, Friday, 30 October
Mostly clear. High 77°, low 66°.
0Ontario, Saturday, 31 October
Overcast. High 78°, low 67°.
0.07Ontario, Sunday, 1 November
Light rain. High 71°, low 66°.
0.02Ontario, Monday, 2 November
Light rain. High 70°, low 64°.
0Ontario, Tuesday, 3 November
Overcast. High 72°, low 63°.
0Ontario, Wednesday, 4 November
Partly cloudy. High 75°, low 64°.
0.01Ontario, Thursday, 5 November
Climate normal for this date — 60-year average.
0.02Ontario, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Ontario, Saturday, 7 November
Climate normal for this date — 60-year average.
0.08Ontario, Sunday, 8 November
Climate normal for this date — 60-year average.
0.06Ontario, Monday, 9 November
Climate normal for this date — 60-year average.
0.04Ontario, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.07Ontario, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.04Ontario, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Ontario, Friday, 13 November
Climate normal for this date — 60-year average.
0.05Ontario, Saturday, 14 November
Climate normal for this date — 60-year average.
0.06Ontario, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Ontario, Monday, 16 November
Climate normal for this date — 60-year average.
0.04Ontario, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.08Ontario, Wednesday, 18 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 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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