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As of 14:10 CDT

Weather in Ontario, IL

82°Current weather

Ontario, Saturday, 8 August, 14:10

Clear. Feels like 86°. High 83°, low 68°.

Pressure30.03 inHg
Wind5.2 mph N
Humidity66%
Visibility6.2 mi
Dew point69°
Sun, 0990° / 66°0Overcast
90 °Overcast

Ontario, Sunday, 9 August

Overcast. High 90°, low 66°.

Pressure29.88 inHg
Wind13.9 mph SW
Humidity67%
Visibility6.2 mi
Dew point73°
Mon, 1088° / 72°0.02Light rain
88 °Light rain

Ontario, Monday, 10 August

Light rain. High 88°, low 72°.

Pressure29.88 inHg
Wind3.7 mph W
Humidity77%
Visibility6.2 mi
Dew point73°
Tue, 1190° / 73°0Overcast
90 °Overcast

Ontario, Tuesday, 11 August

Overcast. High 90°, low 73°.

Pressure29.77 inHg
Wind14.7 mph S
Humidity69%
Visibility6.2 mi
Dew point70°
Wed, 1277° / 69°0.06Light rain
77 °Light rain

Ontario, Wednesday, 12 August

Light rain. High 77°, low 69°.

Pressure29.85 inHg
Wind9.4 mph E
Humidity79%
Visibility6.2 mi
Dew point70°
Thu, 1373° / 65°0.36Rain
73 °Rain

Ontario, Thursday, 13 August

Rain. High 73°, low 65°.

Pressure29.91 inHg
Wind10.4 mph NE
Humidity89%
Visibility—
Dew point67°
Fri, 1476° / 56°0Clear
76 °Clear

Ontario, Friday, 14 August

Clear. High 76°, low 56°.

Pressure30.18 inHg
Wind7.2 mph NE
Humidity61%
Visibility—
Dew point57°
Sat, 1575° / 56°0Overcast
75 °Overcast

Ontario, Saturday, 15 August

Overcast. High 75°, low 56°.

Pressure30.30 inHg
Wind8.6 mph SE
Humidity61%
Visibility—
Dew point57°
Sun, 1674° / 58°0Overcast
74 °Overcast

Ontario, Sunday, 16 August

Overcast. High 74°, low 58°.

Pressure30.15 inHg
Wind11.7 mph S
Humidity71%
Visibility—
Dew point60°
Mon, 1780° / 66°0.02Light rain
80 °Light rain

Ontario, Monday, 17 August

Light rain. High 80°, low 66°.

Pressure29.94 inHg
Wind7.5 mph SE
Humidity83%
Visibility—
Dew point71°
Tue, 1884° / 70°0.02Light rain
84 °Light rain

Ontario, Tuesday, 18 August

Light rain. High 84°, low 70°.

Pressure30.00 inHg
Wind7.5 mph SE
Humidity69%
Visibility—
Dew point70°
Wed, 1988° / 69°0.1Light rain
88 °Light rain

Ontario, Wednesday, 19 August

Light rain. High 88°, low 69°.

Pressure29.88 inHg
Wind10.6 mph NE
Humidity64%
Visibility—
Dew point70°
Thu, 2079° / 66°0.51Rain
79 °Rain

Ontario, Thursday, 20 August

Rain. High 79°, low 66°.

Pressure29.91 inHg
Wind12.3 mph NE
Humidity67%
Visibility—
Dew point66°
Fri, 2181° / 63°0Clear
81 °Clear

Ontario, Friday, 21 August

Clear. High 81°, low 63°.

Pressure29.97 inHg
Wind7 mph NE
Humidity58%
Visibility—
Dew point61°
Sat, 2281° / 61°0.02Light rain
81 °Light rain

Ontario, Saturday, 22 August

Light rain. High 81°, low 61°.

Pressure29.94 inHg
Wind18.7 mph NE
Humidity57%
Visibility—
Dew point62°
Sun, 2368° / 47°0Mostly clear
68 °Mostly clear

Ontario, Sunday, 23 August

Mostly clear. High 68°, low 47°.

Pressure30.21 inHg
Wind13.2 mph E
Humidity48%
Visibility—
Dew point44°

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.