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As of 15:14 CDT

Weather in Ottawa, IL

81°Current weather

Ottawa, Saturday, 8 August, 15:14

Clear. Feels like 83°. High 82°, low 69°.

Pressure30.00 inHg
Wind6 mph NW
Humidity63%
Visibility6.2 mi
Dew point68°
Sun, 0987° / 64°0.44Rain
87 °Rain

Ottawa, Sunday, 9 August

Rain. High 87°, low 64°.

Pressure29.91 inHg
Wind6.3 mph S
Humidity90%
Visibility6.2 mi
Dew point75°
Mon, 1088° / 72°0.02Light rain
88 °Light rain

Ottawa, Monday, 10 August

Light rain. High 88°, low 72°.

Pressure29.88 inHg
Wind7.3 mph SE
Humidity82%
Visibility6.2 mi
Dew point75°
Tue, 1187° / 72°0.1Light rain
87 °Light rain

Ottawa, Tuesday, 11 August

Light rain. High 87°, low 72°.

Pressure29.77 inHg
Wind16.5 mph SW
Humidity74%
Visibility6.2 mi
Dew point74°
Wed, 1278° / 68°0.03Light rain
78 °Light rain

Ottawa, Wednesday, 12 August

Light rain. High 78°, low 68°.

Pressure29.88 inHg
Wind3.9 mph NW
Humidity87%
Visibility6.2 mi
Dew point70°
Thu, 1373° / 61°0.01Light rain
73 °Light rain

Ottawa, Thursday, 13 August

Light rain. High 73°, low 61°.

Pressure29.94 inHg
Wind13.8 mph E
Humidity73%
Visibility—
Dew point62°
Fri, 1473° / 54°0Clear
73 °Clear

Ottawa, Friday, 14 August

Clear. High 73°, low 54°.

Pressure30.18 inHg
Wind7 mph NE
Humidity66%
Visibility—
Dew point58°
Sat, 1573° / 54°0Overcast
73 °Overcast

Ottawa, Saturday, 15 August

Overcast. High 73°, low 54°.

Pressure30.33 inHg
Wind6.6 mph SE
Humidity62%
Visibility—
Dew point56°
Sun, 1676° / 57°0Overcast
76 °Overcast

Ottawa, Sunday, 16 August

Overcast. High 76°, low 57°.

Pressure30.18 inHg
Wind9.7 mph S
Humidity68%
Visibility—
Dew point61°
Mon, 1779° / 67°0.02Light rain
79 °Light rain

Ottawa, Monday, 17 August

Light rain. High 79°, low 67°.

Pressure29.97 inHg
Wind7.1 mph S
Humidity84%
Visibility—
Dew point71°
Tue, 1882° / 69°0.02Light rain
82 °Light rain

Ottawa, Tuesday, 18 August

Light rain. High 82°, low 69°.

Pressure30.03 inHg
Wind7.7 mph E
Humidity78%
Visibility—
Dew point71°
Wed, 1982° / 64°0.26Light rain
82 °Light rain

Ottawa, Wednesday, 19 August

Light rain. High 82°, low 64°.

Pressure29.91 inHg
Wind8.6 mph SW
Humidity74%
Visibility—
Dew point71°
Thu, 2075° / 66°0.2Light rain
75 °Light rain

Ottawa, Thursday, 20 August

Light rain. High 75°, low 66°.

Pressure29.91 inHg
Wind8.9 mph N
Humidity79%
Visibility—
Dew point67°
Fri, 2179° / 61°0Light rain
79 °Light rain

Ottawa, Friday, 21 August

Light rain. High 79°, low 61°.

Pressure29.97 inHg
Wind6.1 mph NE
Humidity64%
Visibility—
Dew point63°
Sat, 2278° / 57°0Light rain
78 °Light rain

Ottawa, Saturday, 22 August

Light rain. High 78°, low 57°.

Pressure29.91 inHg
Wind16.9 mph NE
Humidity68%
Visibility—
Dew point65°
Sun, 2367° / 49°0Clear
67 °Clear

Ottawa, Sunday, 23 August

Clear. High 67°, low 49°.

Pressure30.24 inHg
Wind12.2 mph E
Humidity54%
Visibility—
Dew point47°

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 Ottawa, 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 Ottawa, 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.