Weather in Ontario, CA
Ontario, Thursday, 15 October, 10:16
Clear. Feels like 80°. High 88°, low 58°.
Monthly outlook for Ontario, CA: average high 76.9°, average low 61.4°. That is 0.2° below the climate normal for October. Precipitation is expected on 2 days (about 0.6 inches), against a normal of 2 days and 0.5 inches. The warmest day looks like 16 October (92.4°), the coolest 26 October (54.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 81.1° | 78.4° | +1.5° |
| 25 October – 3 November | 69.9° | 75.3° | -3° |
| 4 November – 13 November | at normal | 72° | — |
October records over 66 years
0
Ontario, Friday, 16 October
Mostly clear. High 92°, low 71°.
0Ontario, Saturday, 17 October
Clear. High 88°, low 65°.
0Ontario, Sunday, 18 October
Clear. High 83°, low 64°.
0Ontario, Monday, 19 October
Clear. High 82°, low 64°.
0.04
Ontario, Tuesday, 20 October
Light rain. High 81°, low 62°.
0.52Ontario, Wednesday, 21 October
Rain. High 63°, low 59°.
0.02Ontario, Thursday, 22 October
Light rain. High 71°, low 60°.
0Ontario, Friday, 23 October
Clear. High 79°, low 63°.
0Ontario, Saturday, 24 October
Clear. High 83°, low 68°.
0
Ontario, Sunday, 25 October
Overcast. High 74°, low 58°.
0.04Ontario, Monday, 26 October
Light rain. High 63°, low 55°.
0Ontario, Tuesday, 27 October
Light rain. High 66°, low 56°.
0Ontario, Wednesday, 28 October
Overcast. High 69°, low 59°.
0Ontario, Thursday, 29 October
Clear. High 70°, low 59°.
0
Ontario, Friday, 30 October
Partly cloudy. High 76°, low 62°.
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
56°Weather in Annapolis, MD63°Weather in Atlanta, GA83°Weather in Augusta, ME55°Weather in Austin, TX83°Weather in Baton Rouge, LA83°Weather in Bismarck, ND46°Weather in Boise, ID53°Weather in Boston, MA60°Weather in Carson City, NV57°Weather in Charleston, WV74°Weather in Charlotte Amalie, VI88°Weather in Cheyenne, WY42°Weather in Columbia, SC84°Weather in Columbus, OH62°Weather in Concord, NH57°Weather in Denver, CO46°Weather in Des Moines, IA59°Weather in Dover, DE66°Weather in Frankfort, KY75°Weather in Harrisburg, PA63°Weather in Hartford, CT61°Weather in Helena, MT43°Weather in Honolulu, HI
75°Weather in Indianapolis, IN67°Weather in Jackson, MS84°Weather in Jefferson City, MO73°Weather in Juneau, AK39°Weather in Lansing, MI56°Weather in Lincoln, NE52°Weather in Little Rock, AR84°Weather in Madison, WI55°Weather in Montgomery, AL83°Weather in Montpelier, VT51°Weather in Nashville, TN83°Weather in Oklahoma City, OK67°Weather in Olympia, WA52°Weather in Phoenix, AZ72°Weather in Pierre, SD48°Weather in Providence, RI61°Weather in Raleigh, NC84°Weather in Richmond, VA70°Weather in Sacramento, CA61°Weather in Salem, OR55°Weather in Salt Lake City, UT52°Weather in San Juan, PR89°Weather in Santa Fe, NM49°Weather in Springfield, IL68°Weather in St. Paul, MN50°Weather in Tallahassee, FL85°Weather in Topeka, KS69°Weather in Trenton, NJ64°Weather in Washington, DC65°62°Weather in Melones, CA71°Weather in Mesa Camp, CA60°Weather in Midas, CA65°Weather in Middleton, CA67°Weather in Miller, CA68°Weather in Mission Springs, CA70°Weather in Moccasin, CA56°Weather in Mock, CA65°Weather in Monte Rosa, CA74°Weather in Monte Vista, CA70°Weather in Montesano, CA74°Weather in Mount Hannah Lodge, CA73°Weather in Muscatel, CA69°Weather in Nashville, CA72°Weather in Nebelhorn, CA53°Weather in Need, CA68°Weather in Nimbus, CA71°Weather in Nortonville, CA66°Weather in Noyo, CA67°