Weather in Ontario, CA
Ontario, Wednesday, 28 October, 15:15
Mostly clear. Feels like 75°. High 76°, low 55°.
Monthly outlook for Ontario, CA: average high 73.8°, average low 60.6°. That is 0.3° above the climate normal for October. Precipitation is expected on 5 days (about 2.2 inches), against a normal of 2 days and 0.6 inches. The warmest day looks like 11 November (82.3°), the coolest 2 November (53.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 28 October – 6 November | 71.7° | 74.5° | -1.5° |
| 7 November – 16 November | 77.1° | 70.8° | +3.5° |
| 17 November – 26 November | at normal | 68° | — |
October records over 66 years
0
Ontario, Thursday, 29 October
Clear. High 76°, low 56°.
0.12
Ontario, Friday, 30 October
Light rain. High 68°, low 58°.
0.3Ontario, Saturday, 31 October
Rain. High 68°, low 57°.
0.66Ontario, Sunday, 1 November
Rain. High 67°, low 57°.
0Ontario, Monday, 2 November
Clear. High 66°, low 53°.
0Ontario, Tuesday, 3 November
Mostly clear. High 81°, low 54°.
0
Ontario, Wednesday, 4 November
Partly cloudy. High 77°, low 66°.
0Ontario, Thursday, 5 November
Partly cloudy. High 72°, low 63°.
0.19Ontario, Friday, 6 November
Light rain. High 67°, low 62°.
0.93Ontario, Saturday, 7 November
Heavy rain. High 63°, low 59°.
0Ontario, Sunday, 8 November
Clear. High 74°, low 58°.
0Ontario, Monday, 9 November
Clear. High 81°, low 67°.
0Ontario, Tuesday, 10 November
Clear. High 82°, low 66°.
0Ontario, Wednesday, 11 November
Clear. High 82°, low 68°.
0Ontario, Thursday, 12 November
Clear. High 82°, low 68°.
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.
0.06Ontario, Thursday, 19 November
Climate normal for this date — 60-year average.
0.07Ontario, Friday, 20 November
Climate normal for this date — 60-year average.
0.12Ontario, Saturday, 21 November
Climate normal for this date — 60-year average.
0.07Ontario, Sunday, 22 November
Climate normal for this date — 60-year average.
0.01Ontario, Monday, 23 November
Climate normal for this date — 60-year average.
0.04Ontario, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.07Ontario, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.08Ontario, Thursday, 26 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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