As of 11:45 CDT

Weather in Ontario, IL

74°

Ontario, Thursday, 8 October, 11:45

Partly cloudy. Feels like 73°. High 75°, low 49°.

Pressure30.09 inHg

Wind0 mph N

Humidity39%

Visibility6.2 mi

Dew point47°

See detailed hourly forecast

Fri, 0981° / 52°

0.01

81 °

Ontario, Friday, 9 October

Light rain. High 81°, low 52°.

Pressure30.09 inHg

Wind8.7 mph S

Humidity57%

Visibility6.2 mi

Dew point53°

Sat, 1078° / 61°

78 °

Ontario, Saturday, 10 October

Overcast. High 78°, low 61°.

Pressure30.06 inHg

Wind8.5 mph S

Humidity56%

Visibility6.2 mi

Dew point57°

Sun, 1176° / 55°

76 °

Ontario, Sunday, 11 October

Clear. High 76°, low 55°.

Pressure29.97 inHg

Wind1.8 mph E

Humidity62%

Visibility6.2 mi

Dew point57°

Mon, 1283° / 61°

83 °

Ontario, Monday, 12 October

Clear. High 83°, low 61°.

Pressure29.83 inHg

Wind11.3 mph SW

Humidity52%

Visibility—

Dew point60°

Tue, 1377° / 64°

0.06

77 °

Ontario, Tuesday, 13 October

Light rain. High 77°, low 64°.

Pressure29.88 inHg

Wind10.1 mph N

Humidity72%

Visibility—

Dew point66°

Wed, 1466° / 55°

0.18

66 °

Ontario, Wednesday, 14 October

Light rain. High 66°, low 55°.

Pressure29.94 inHg

Wind14.8 mph E

Humidity89%

Visibility—

Dew point52°

Thu, 1586° / 70°

0.16

86 °

Ontario, Thursday, 15 October

Light rain. High 86°, low 70°.

Pressure29.83 inHg

Wind18.8 mph SW

Humidity56%

Visibility—

Dew point67°

Fri, 1668° / 49°

0.02

68 °

Ontario, Friday, 16 October

Light rain. High 68°, low 49°.

Pressure30.30 inHg

Wind14.7 mph NW

Humidity65%

Visibility—

Dew point45°

Sat, 1754° / 42°

54 °

Ontario, Saturday, 17 October

Overcast. High 54°, low 42°.

Pressure30.62 inHg

Wind13.1 mph NE

Humidity52%

Visibility—

Dew point35°

Sun, 1856° / 41°

56 °

Ontario, Sunday, 18 October

Overcast. High 56°, low 41°.

Pressure30.45 inHg

Wind9.6 mph SE

Humidity45%

Visibility—

Dew point33°

Mon, 1972° / 48°

72 °

Ontario, Monday, 19 October

Overcast. High 72°, low 48°.

Pressure30.15 inHg

Wind13.9 mph SW

Humidity52%

Visibility—

Dew point47°

Tue, 2073° / 54°

73 °

Ontario, Tuesday, 20 October

Partly cloudy. High 73°, low 54°.

Pressure30.12 inHg

Wind10.7 mph W

Humidity51%

Visibility—

Dew point50°

Wed, 2169° / 51°

69 °

Ontario, Wednesday, 21 October

Clear. High 69°, low 51°.

Pressure30.09 inHg

Wind8.4 mph W

Humidity37%

Visibility—

Dew point38°

Thu, 2259° / 49°

0.17

59 °

Ontario, Thursday, 22 October

Rain. High 59°, low 49°.

Pressure29.94 inHg

Wind20.3 mph W

Humidity46%

Visibility—

Dew point38°

Fri, 2359° / 41°

59 °

Ontario, Friday, 23 October

Clear. High 59°, low 41°.

Pressure30.15 inHg

Wind14.1 mph W

Humidity50%

Visibility—

Dew point36°

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.