Weather in Ontario, CA
Ontario, Thursday, 22 October, 11:49
Thunderstorm. Feels like 64°. High 66°, low 57°.
Monthly outlook for Ontario, CA: average high 75.2°, average low 62.9°. That is 0.2° below the climate normal for October. Precipitation is expected on 2 days (about 0.9 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 2 November (82.5°), the coolest 24 October (52.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 22 October – 31 October | 72.7° | 76° | -1.8° |
| 1 November – 10 November | 79.3° | 73.3° | +3.3° |
| 11 November – 20 November | at normal | 69.9° | — |
October records over 66 years
0.11
Ontario, Friday, 23 October
Rain. High 68°, low 55°.
0
Ontario, Saturday, 24 October
Clear. High 70°, low 53°.
0Ontario, Sunday, 25 October
Clear. High 74°, low 57°.
0
Ontario, Monday, 26 October
Overcast. High 75°, low 60°.
0Ontario, Tuesday, 27 October
Overcast. High 73°, low 58°.
0Ontario, Wednesday, 28 October
Overcast. High 80°, low 65°.
0Ontario, Thursday, 29 October
Overcast. High 76°, low 67°.
0.01Ontario, Friday, 30 October
Light rain. High 74°, low 64°.
0Ontario, Saturday, 31 October
Overcast. High 70°, low 62°.
0Ontario, Sunday, 1 November
Overcast. High 79°, low 63°.
0
Ontario, Monday, 2 November
Partly cloudy. High 83°, low 71°.
0Ontario, Tuesday, 3 November
Clear. High 81°, low 70°.
0Ontario, Wednesday, 4 November
Clear. High 80°, low 69°.
0Ontario, Thursday, 5 November
Overcast. High 77°, low 69°.
0Ontario, Friday, 6 November
Clear. High 76°, low 67°.
0.06
Ontario, 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.
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.
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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