As of 08:34 CDT

Weather in Herrin, IL

56°

Herrin, Friday, 9 October, 08:34

Clear. Feels like 54°. High 85°, low 54°.

Pressure30.12 inHg

Wind5.7 mph SE

Humidity76%

Visibility6.2 mi

Dew point48°

See detailed hourly forecast

Sat, 1074° / 56°

74 °

Herrin, Saturday, 10 October

Light rain. High 74°, low 56°.

Pressure30.03 inHg

Wind5 mph NE

Humidity58%

Visibility6.2 mi

Dew point53°

Sun, 1182° / 56°

0.01

82 °

Herrin, Sunday, 11 October

Light rain. High 82°, low 56°.

Pressure29.97 inHg

Wind7 mph W

Humidity57%

Visibility6.2 mi

Dew point59°

Mon, 1288° / 64°

88 °

Herrin, Monday, 12 October

Clear. High 88°, low 64°.

Pressure29.94 inHg

Wind11 mph SW

Humidity46%

Visibility6.2 mi

Dew point62°

Tue, 1390° / 69°

90 °

Herrin, Tuesday, 13 October

Clear. High 90°, low 69°.

Pressure29.88 inHg

Wind10.7 mph SW

Humidity47%

Visibility—

Dew point62°

Wed, 1478° / 71°

0.33

78 °

Herrin, Wednesday, 14 October

Rain. High 78°, low 71°.

Pressure29.94 inHg

Wind6 mph SW

Humidity95%

Visibility—

Dew point74°

Thu, 1580° / 64°

0.04

80 °

Herrin, Thursday, 15 October

Light rain. High 80°, low 64°.

Pressure29.97 inHg

Wind9.2 mph S

Humidity53%

Visibility—

Dew point59°

Fri, 1680° / 52°

0.18

80 °

Herrin, Friday, 16 October

Rain. High 80°, low 52°.

Pressure30.03 inHg

Wind17.9 mph NW

Humidity28%

Visibility—

Dew point35°

Sat, 1754° / 40°

54 °

Herrin, Saturday, 17 October

Clear. High 54°, low 40°.

Pressure30.42 inHg

Wind17.9 mph NW

Humidity29%

Visibility—

Dew point20°

Sun, 1860° / 34°

60 °

Herrin, Sunday, 18 October

Clear. High 60°, low 34°.

Pressure30.39 inHg

Wind7.1 mph S

Humidity25%

Visibility—

Dew point19°

Mon, 1966° / 42°

66 °

Herrin, Monday, 19 October

Overcast. High 66°, low 42°.

Pressure30.30 inHg

Wind8.9 mph SW

Humidity22%

Visibility—

Dew point23°

Tue, 2073° / 46°

73 °

Herrin, Tuesday, 20 October

Clear. High 73°, low 46°.

Pressure30.33 inHg

Wind7.9 mph S

Humidity26%

Visibility—

Dew point32°

Wed, 2176° / 52°

76 °

Herrin, Wednesday, 21 October

Overcast. High 76°, low 52°.

Pressure30.27 inHg

Wind10.5 mph S

Humidity26%

Visibility—

Dew point35°

Thu, 2277° / 51°

0.01

77 °

Herrin, Thursday, 22 October

Light rain. High 77°, low 51°.

Pressure30.06 inHg

Wind13.5 mph SW

Humidity38%

Visibility—

Dew point45°

Fri, 2363° / 48°

0.04

63 °

Herrin, Friday, 23 October

Light rain. High 63°, low 48°.

Pressure30.09 inHg

Wind15.4 mph NW

Humidity33%

Visibility—

Dew point31°

Sat, 2454° / 36°

54 °

Herrin, Saturday, 24 October

Clear. High 54°, low 36°.

Pressure30.21 inHg

Wind13.5 mph NW

Humidity35%

Visibility—

Dew point24°

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 Herrin, 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 Herrin, 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.