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As of 03:50 CDT

Weather in Ontario, IL

58°Current weather

Ontario, Sunday, 11 October, 03:50

Clear. Feels like 57°. High 80°, low 55°.

Pressure29.97 inHg
Wind3.4 mph SE
Humidity83%
Visibility6.2 mi
Dew point52°
Mon, 1285° / 62°0Overcast
85 °Overcast

Ontario, Monday, 12 October

Overcast. High 85°, low 62°.

Pressure29.83 inHg
Wind13.8 mph SW
Humidity55%
Visibility6.2 mi
Dew point62°
Tue, 1379° / 68°0.06Light rain
79 °Light rain

Ontario, Tuesday, 13 October

Light rain. High 79°, low 68°.

Pressure29.85 inHg
Wind5.8 mph W
Humidity63%
Visibility6.2 mi
Dew point63°
Wed, 1473° / 63°1.02Heavy rain
73 °Heavy rain

Ontario, Wednesday, 14 October

Heavy rain. High 73°, low 63°.

Pressure30.06 inHg
Wind7.9 mph NE
Humidity64%
Visibility6.2 mi
Dew point59°
Thu, 1560° / 56°1.28Heavy rain
60 °Heavy rain

Ontario, Thursday, 15 October

Heavy rain. High 60°, low 56°.

Pressure30.15 inHg
Wind12.1 mph E
Humidity96%
Visibility—
Dew point55°
Fri, 1658° / 42°0.06Light rain
58 °Light rain

Ontario, Friday, 16 October

Light rain. High 58°, low 42°.

Pressure30.45 inHg
Wind18.2 mph N
Humidity50%
Visibility—
Dew point38°
Sat, 1741° / 29°0Mostly clear
41 °Mostly clear

Ontario, Saturday, 17 October

Mostly clear. High 41°, low 29°.

Pressure30.47 inHg
Wind20.5 mph N
Humidity42%
Visibility—
Dew point17°
Sun, 1847° / 27°0Clear
47 °Clear

Ontario, Sunday, 18 October

Clear. High 47°, low 27°.

Pressure30.53 inHg
Wind9.9 mph SW
Humidity35%
Visibility—
Dew point17°
Mon, 1960° / 36°0Partly cloudy
60 °Partly cloudy

Ontario, Monday, 19 October

Partly cloudy. High 60°, low 36°.

Pressure30.24 inHg
Wind17.6 mph SW
Humidity34%
Visibility—
Dew point26°
Tue, 2065° / 42°0Clear
65 °Clear

Ontario, Tuesday, 20 October

Clear. High 65°, low 42°.

Pressure30.15 inHg
Wind15.5 mph SW
Humidity33%
Visibility—
Dew point31°
Wed, 2167° / 47°0Mostly clear
67 °Mostly clear

Ontario, Wednesday, 21 October

Mostly clear. High 67°, low 47°.

Pressure30.15 inHg
Wind16.6 mph SW
Humidity35%
Visibility—
Dew point35°
Thu, 2269° / 52°0Partly cloudy
69 °Partly cloudy

Ontario, Thursday, 22 October

Partly cloudy. High 69°, low 52°.

Pressure30.33 inHg
Wind9 mph N
Humidity36%
Visibility—
Dew point39°
Fri, 2369° / 46°0Partly cloudy
69 °Partly cloudy

Ontario, Friday, 23 October

Partly cloudy. High 69°, low 46°.

Pressure30.24 inHg
Wind19.1 mph S
Humidity43%
Visibility—
Dew point40°
Sat, 2463° / 45°0.09Light rain
63 °Light rain

Ontario, Saturday, 24 October

Light rain. High 63°, low 45°.

Pressure30.18 inHg
Wind19.3 mph NW
Humidity55%
Visibility—
Dew point39°
Sun, 2552° / 36°0Partly cloudy
52 °Partly cloudy

Ontario, Sunday, 25 October

Partly cloudy. High 52°, low 36°.

Pressure30.39 inHg
Wind8.7 mph W
Humidity46%
Visibility—
Dew point28°
Mon, 2657° / 40°0Partly cloudy
57 °Partly cloudy

Ontario, Monday, 26 October

Partly cloudy. High 57°, low 40°.

Pressure30.09 inHg
Wind13.5 mph N
Humidity46%
Visibility—
Dew point34°

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, IL 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, IL 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.