As of 16:28 CDT

Weather in Ottawa, IL

81°

Ottawa, Saturday, 10 October, 16:28

Overcast. Feels like 80°. High 81°, low 59°.

Pressure30.00 inHg

Wind9.3 mph S

Humidity33%

Visibility6.2 mi

Dew point51°

See detailed hourly forecast

Sun, 1179° / 55°

79 °

Ottawa, Sunday, 11 October

Clear. High 79°, low 55°.

Pressure29.97 inHg

Wind4 mph S

Humidity61%

Visibility6.2 mi

Dew point57°

Mon, 1282° / 61°

82 °

Ottawa, Monday, 12 October

Overcast. High 82°, low 61°.

Pressure29.85 inHg

Wind11.2 mph SW

Humidity59%

Visibility6.2 mi

Dew point64°

Tue, 1380° / 67°

80 °

Ottawa, Tuesday, 13 October

Clear. High 80°, low 67°.

Pressure29.83 inHg

Wind9.7 mph W

Humidity67%

Visibility6.2 mi

Dew point67°

Wed, 1472° / 59°

0.17

72 °

Ottawa, Wednesday, 14 October

Rain. High 72°, low 59°.

Pressure30.06 inHg

Wind6.6 mph N

Humidity66%

Visibility6.2 mi

Dew point59°

Thu, 1557° / 55°

0.5

57 °

Ottawa, Thursday, 15 October

Rain. High 57°, low 55°.

Pressure30.24 inHg

Wind10.6 mph E

Humidity87%

Visibility—

Dew point53°

Fri, 1655° / 40°

55 °

Ottawa, Friday, 16 October

Overcast. High 55°, low 40°.

Pressure30.06 inHg

Wind21.5 mph W

Humidity51%

Visibility—

Dew point36°

Sat, 1741° / 34°

0.02

41 °

Ottawa, Saturday, 17 October

Light snow. High 41°, low 34°.

Pressure30.24 inHg

Wind17.6 mph NW

Humidity60%

Visibility—

Dew point26°

Sun, 1845° / 28°

45 °

Ottawa, Sunday, 18 October

Clear. High 45°, low 28°.

Pressure30.59 inHg

Wind14 mph N

Humidity40%

Visibility—

Dew point19°

Mon, 1951° / 32°

51 °

Ottawa, Monday, 19 October

Overcast. High 51°, low 32°.

Pressure30.62 inHg

Wind11.6 mph S

Humidity41%

Visibility—

Dew point24°

Tue, 2060° / 38°

60 °

Ottawa, Tuesday, 20 October

Clear. High 60°, low 38°.

Pressure30.39 inHg

Wind12.8 mph S

Humidity32%

Visibility—

Dew point25°

Wed, 2166° / 43°

66 °

Ottawa, Wednesday, 21 October

Clear. High 66°, low 43°.

Pressure30.27 inHg

Wind13.4 mph S

Humidity33%

Visibility—

Dew point31°

Thu, 2268° / 49°

68 °

Ottawa, Thursday, 22 October

Overcast. High 68°, low 49°.

Pressure30.24 inHg

Wind14.8 mph SW

Humidity33%

Visibility—

Dew point34°

Fri, 2351° / 46°

51 °

Ottawa, Friday, 23 October

Overcast. High 51°, low 46°.

Pressure30.21 inHg

Wind16.7 mph NW

Humidity76%

Visibility—

Dew point41°

Sat, 2458° / 45°

58 °

Ottawa, Saturday, 24 October

Overcast. High 58°, low 45°.

Pressure30.18 inHg

Wind9.6 mph NE

Humidity61%

Visibility—

Dew point43°

Sun, 2562° / 46°

62 °

Ottawa, Sunday, 25 October

Mostly clear. High 62°, low 46°.

Pressure30.15 inHg

Wind11.8 mph NE

Humidity50%

Visibility—

Dew point40°

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.