Weather in Ontario, CA
Ontario, Saturday, 31 October, 09:18
Overcast. Feels like 60°. High 68°, low 58°.
Monthly outlook for Ontario, CA: average high 76.5°, average low 63.2°. That is 2.2° above the climate normal for October. Precipitation is expected on 2 days (about 0.8 inches), against a normal of 2 days and 0.7 inches. The warmest day looks like 7 November (84.9°), the coolest 2 November (50.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 31 October – 9 November | 73.8° | 73.6° | +0.1° |
| 10 November – 19 November | 81° | 70.1° | +6.1° |
| 20 November – 29 November | at normal | 66.9° | — |
October records over 66 years
0.7
Ontario, Sunday, 1 November
Heavy rain. High 65°, low 53°.
0
Ontario, Monday, 2 November
Partly cloudy. High 67°, low 50°.
0
Ontario, Tuesday, 3 November
Clear. High 72°, low 55°.
0Ontario, Wednesday, 4 November
Clear. High 66°, low 53°.
0Ontario, Thursday, 5 November
Clear. High 72°, low 53°.
0Ontario, Friday, 6 November
Clear. High 79°, low 61°.
0Ontario, Saturday, 7 November
Clear. High 85°, low 68°.
0Ontario, Sunday, 8 November
Partly cloudy. High 83°, low 69°.
0Ontario, Monday, 9 November
Overcast. High 82°, low 71°.
0Ontario, Tuesday, 10 November
Overcast. High 81°, low 69°.
0Ontario, Wednesday, 11 November
Clear. High 83°, low 69°.
0Ontario, Thursday, 12 November
Clear. High 84°, low 70°.
0Ontario, Friday, 13 November
Overcast. High 79°, low 72°.
0Ontario, Saturday, 14 November
Overcast. High 78°, low 70°.
0Ontario, Sunday, 15 November
Overcast. High 81°, low 69°.
0.06
Ontario, 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.
0.05Ontario, Friday, 27 November
Climate normal for this date — 60-year average.
0.11Ontario, Saturday, 28 November
Climate normal for this date — 60-year average.
0.14Ontario, Sunday, 29 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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