As of 17:56 CDT

Weather in Ottawa, IL

76°

Ottawa, Sunday, 11 October, 17:56

Clear. Feels like 77°. High 78°, low 53°.

Pressure29.91 inHg

Wind4.5 mph S

Humidity61%

Visibility6.2 mi

Dew point60°

See detailed hourly forecast

Mon, 1285° / 62°

85 °

Ottawa, Monday, 12 October

Clear. High 85°, low 62°.

Pressure29.85 inHg

Wind11.9 mph SW

Humidity57%

Visibility6.2 mi

Dew point63°

Tue, 1381° / 68°

81 °

Ottawa, Tuesday, 13 October

Light rain. High 81°, low 68°.

Pressure29.83 inHg

Wind8.9 mph W

Humidity65%

Visibility6.2 mi

Dew point66°

Wed, 1470° / 60°

0.13

70 °

Ottawa, Wednesday, 14 October

Rain. High 70°, low 60°.

Pressure30.06 inHg

Wind6.8 mph NE

Humidity74%

Visibility6.2 mi

Dew point61°

Thu, 1564° / 58°

1.31

64 °

Ottawa, Thursday, 15 October

Rain. High 64°, low 58°.

Pressure30.00 inHg

Wind6.9 mph E

Humidity96%

Visibility1.6 mi

Dew point60°

Fri, 1658° / 47°

0.02

58 °

Ottawa, Friday, 16 October

Light rain. High 58°, low 47°.

Pressure30.45 inHg

Wind16.7 mph NW

Humidity44%

Visibility—

Dew point35°

Sat, 1747° / 37°

47 °

Ottawa, Saturday, 17 October

Clear. High 47°, low 37°.

Pressure30.62 inHg

Wind6.6 mph NE

Humidity39%

Visibility—

Dew point22°

Sun, 1856° / 34°

56 °

Ottawa, Sunday, 18 October

Clear. High 56°, low 34°.

Pressure30.45 inHg

Wind19.2 mph SW

Humidity39%

Visibility—

Dew point27°

Mon, 1964° / 42°

64 °

Ottawa, Monday, 19 October

Clear. High 64°, low 42°.

Pressure30.36 inHg

Wind13.9 mph SW

Humidity33%

Visibility—

Dew point30°

Tue, 2065° / 50°

65 °

Ottawa, Tuesday, 20 October

Overcast. High 65°, low 50°.

Pressure30.33 inHg

Wind10.4 mph SE

Humidity43%

Visibility—

Dew point38°

Wed, 2169° / 57°

0.02

69 °

Ottawa, Wednesday, 21 October

Light rain. High 69°, low 57°.

Pressure30.15 inHg

Wind16 mph S

Humidity61%

Visibility—

Dew point50°

Thu, 2271° / 61°

0.06

71 °

Ottawa, Thursday, 22 October

Light rain. High 71°, low 61°.

Pressure30.21 inHg

Wind16.1 mph S

Humidity66%

Visibility—

Dew point57°

Fri, 2363° / 61°

1.19

63 °

Ottawa, Friday, 23 October

Rain. High 63°, low 61°.

Pressure30.09 inHg

Wind14.5 mph S

Humidity85%

Visibility—

Dew point57°

Sat, 2463° / 48°

0.78

63 °

Ottawa, Saturday, 24 October

Rain. High 63°, low 48°.

Pressure30.03 inHg

Wind12.1 mph NW

Humidity87%

Visibility—

Dew point50°

Sun, 2552° / 45°

52 °

Ottawa, Sunday, 25 October

Overcast. High 52°, low 45°.

Pressure30.15 inHg

Wind9.9 mph NW

Humidity59%

Visibility—

Dew point37°

Mon, 2653° / 39°

53 °

Ottawa, Monday, 26 October

Partly cloudy. High 53°, low 39°.

Pressure29.94 inHg

Wind16.6 mph NW

Humidity56%

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 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.