Weather in Ontario, CA
Ontario, Thursday, 15 October, 04:12
Clear. Feels like 61°. High 89°, low 61°.
Monthly outlook for Ontario, CA: average high 82.4°, average low 66.3°. That is 2.8° above the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 2 days and 0.5 inches. The warmest day looks like 16 October (92.2°), the coolest 21 October (58.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 80.9° | 78.4° | +1.4° |
| 25 October – 3 November | 84.9° | 75.3° | +5.4° |
| 4 November – 13 November | at normal | 72° | — |
October records over 66 years
0
Ontario, Friday, 16 October
Mostly clear. High 92°, low 70°.
0
Ontario, Saturday, 17 October
Clear. High 88°, low 65°.
0
Ontario, Sunday, 18 October
Partly cloudy. High 81°, low 67°.
0Ontario, Monday, 19 October
Clear. High 82°, low 65°.
0.08
Ontario, Tuesday, 20 October
Light rain. High 77°, low 62°.
0.7Ontario, Wednesday, 21 October
Rain. High 65°, low 59°.
0Ontario, Thursday, 22 October
Clear. High 72°, low 60°.
0Ontario, Friday, 23 October
Clear. High 79°, low 63°.
0Ontario, Saturday, 24 October
Clear. High 83°, low 69°.
0Ontario, Sunday, 25 October
Clear. High 85°, low 67°.
0Ontario, Monday, 26 October
Clear. High 88°, low 69°.
0
Ontario, Tuesday, 27 October
Overcast. High 88°, low 71°.
0Ontario, Wednesday, 28 October
Overcast. High 86°, low 72°.
0Ontario, Thursday, 29 October
Clear. High 84°, low 71°.
0Ontario, Friday, 30 October
Overcast. High 80°, low 71°.
0.02Ontario, Saturday, 31 October
Climate normal for this date — 60-year average.
0.04Ontario, Sunday, 1 November
Climate normal for this date — 60-year average.
0.03Ontario, Monday, 2 November
Climate normal for this date — 60-year average.
0.01Ontario, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.03Ontario, Wednesday, 4 November
Climate normal for this date — 60-year average.
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.
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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