As of 13:44 CDT

Weather in Harrison, IL

72°

Harrison, Saturday, 10 October, 13:44

Overcast. Feels like 72°. High 74°, low 56°.

Pressure30.03 inHg

Wind4.6 mph NE

Humidity55%

Visibility6.2 mi

Dew point55°

See detailed hourly forecast

Sun, 1184° / 49°

84 °

Harrison, Sunday, 11 October

Clear. High 84°, low 49°.

Pressure30.03 inHg

Wind2.8 mph NW

Humidity56%

Visibility6.2 mi

Dew point57°

Mon, 1289° / 59°

89 °

Harrison, Monday, 12 October

Clear. High 89°, low 59°.

Pressure29.97 inHg

Wind10.6 mph SW

Humidity43%

Visibility6.2 mi

Dew point60°

Tue, 1391° / 68°

91 °

Harrison, Tuesday, 13 October

Clear. High 91°, low 68°.

Pressure29.94 inHg

Wind8.8 mph SW

Humidity45%

Visibility6.2 mi

Dew point62°

Wed, 1478° / 71°

0.63

78 °

Harrison, Wednesday, 14 October

Rain. High 78°, low 71°.

Pressure30.03 inHg

Wind4.1 mph W

Humidity94%

Visibility1.6 mi

Dew point72°

Thu, 1576° / 65°

0.82

76 °

Harrison, Thursday, 15 October

Heavy rain. High 76°, low 65°.

Pressure30.12 inHg

Wind9.3 mph E

Humidity79%

Visibility—

Dew point67°

Fri, 1668° / 50°

1.25

68 °

Harrison, Friday, 16 October

Heavy rain. High 68°, low 50°.

Pressure30.06 inHg

Wind18.7 mph NW

Humidity38%

Visibility—

Dew point38°

Sat, 1746° / 38°

46 °

Harrison, Saturday, 17 October

Overcast. High 46°, low 38°.

Pressure30.36 inHg

Wind18 mph NW

Humidity39%

Visibility—

Dew point21°

Sun, 1852° / 31°

52 °

Harrison, Sunday, 18 October

Clear. High 52°, low 31°.

Pressure30.53 inHg

Wind6.9 mph NW

Humidity34%

Visibility—

Dew point21°

Mon, 1959° / 35°

59 °

Harrison, Monday, 19 October

Clear. High 59°, low 35°.

Pressure30.42 inHg

Wind8.9 mph S

Humidity34%

Visibility—

Dew point27°

Tue, 2064° / 41°

64 °

Harrison, Tuesday, 20 October

Overcast. High 64°, low 41°.

Pressure30.30 inHg

Wind11.5 mph S

Humidity37%

Visibility—

Dew point34°

Wed, 2162° / 49°

0.28

62 °

Harrison, Wednesday, 21 October

Rain. High 62°, low 49°.

Pressure30.09 inHg

Wind15.8 mph S

Humidity65%

Visibility—

Dew point49°

Thu, 2269° / 46°

69 °

Harrison, Thursday, 22 October

Clear. High 69°, low 46°.

Pressure30.24 inHg

Wind6.7 mph SW

Humidity41%

Visibility—

Dew point40°

Fri, 2371° / 50°

71 °

Harrison, Friday, 23 October

Mostly clear. High 71°, low 50°.

Pressure30.18 inHg

Wind6.4 mph SW

Humidity40%

Visibility—

Dew point42°

Sat, 2471° / 49°

71 °

Harrison, Saturday, 24 October

Clear. High 71°, low 49°.

Pressure30.15 inHg

Wind6 mph S

Humidity35%

Visibility—

Dew point38°

Sun, 2573° / 54°

0.03

73 °

Harrison, Sunday, 25 October

Light rain. High 73°, low 54°.

Pressure29.88 inHg

Wind15.2 mph SW

Humidity58%

Visibility—

Dew point53°

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 Harrison, 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 Harrison, 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.