As of 19:56 CDT

Weather in Mendon, IL

68°

Mendon, Tuesday, 6 October, 19:56

Clear. Feels like 67°. High 79°, low 48°.

Pressure29.94 inHg

Wind4.6 mph S

Humidity53%

Visibility6.2 mi

Dew point51°

See detailed hourly forecast

Monthly outlook for Mendon, IL: average high 71.1°, average low 51.3°. That is 3° above the climate normal for October. Precipitation is expected on 3 days (about 1.1 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 14 October (85.9°), the coolest 21 October (35.9°).

71.1°/51.3°

Average high / low

+3°

Above normal

3 / 4

Wet days / normal

1.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
6 October – 15 October	80.6°	67.3°	+7.4°
16 October – 25 October	55.3°	62.7°	-4.2°
26 October – 4 November	at normal	58.4°	—

October records over 66 years

90.7°10 October 1963All-time high

26.2°29 October 1980All-time low

Climate normals and records are computed from the nearest reference point — La Grange (12 mi).

Wed, 0783° / 56°

83 °

Mendon, Wednesday, 7 October

Clear. High 83°, low 56°.

Pressure29.91 inHg

Wind6.9 mph W

Humidity67%

Visibility6.2 mi

Dew point64°

Thu, 0876° / 51°

76 °

Mendon, Thursday, 8 October

Overcast. High 76°, low 51°.

Pressure30.12 inHg

Wind4.3 mph N

Humidity58%

Visibility6.2 mi

Dew point55°

Fri, 0983° / 56°

83 °

Mendon, Friday, 9 October

Clear. High 83°, low 56°.

Pressure30.09 inHg

Wind10.8 mph S

Humidity47%

Visibility6.2 mi

Dew point55°

Sat, 1085° / 64°

85 °

Mendon, Saturday, 10 October

Clear. High 85°, low 64°.

Pressure30.00 inHg

Wind9.5 mph S

Humidity45%

Visibility6.2 mi

Dew point56°

Sun, 1177° / 63°

77 °

Mendon, Sunday, 11 October

Light rain. High 77°, low 63°.

Pressure29.80 inHg

Wind13.1 mph NE

Humidity46%

Visibility—

Dew point53°

Mon, 1281° / 60°

81 °

Mendon, Monday, 12 October

Mostly clear. High 81°, low 60°.

Pressure30.00 inHg

Wind7 mph S

Humidity42%

Visibility—

Dew point51°

Tue, 1385° / 63°

85 °

Mendon, Tuesday, 13 October

Mostly clear. High 85°, low 63°.

Pressure30.00 inHg

Wind7.6 mph S

Humidity40%

Visibility—

Dew point53°

Wed, 1486° / 63°

86 °

Mendon, Wednesday, 14 October

Clear. High 86°, low 63°.

Pressure29.91 inHg

Wind17.1 mph S

Humidity36%

Visibility—

Dew point51°

Thu, 1573° / 55°

0.51

73 °

Mendon, Thursday, 15 October

Rain. High 73°, low 55°.

Pressure29.80 inHg

Wind22 mph S

Humidity78%

Visibility—

Dew point65°

Fri, 1654° / 46°

54 °

Mendon, Friday, 16 October

Overcast. High 54°, low 46°.

Pressure30.30 inHg

Wind17.8 mph N

Humidity52%

Visibility—

Dew point35°

Sat, 1749° / 41°

0.3

49 °

Mendon, Saturday, 17 October

Light rain. High 49°, low 41°.

Pressure30.24 inHg

Wind15.3 mph N

Humidity91%

Visibility—

Dew point41°

Sun, 1849° / 41°

0.27

49 °

Mendon, Sunday, 18 October

Rain. High 49°, low 41°.

Pressure30.18 inHg

Wind11.1 mph SW

Humidity75%

Visibility—

Dew point40°

Mon, 1959° / 36°

59 °

Mendon, Monday, 19 October

Partly cloudy. High 59°, low 36°.

Pressure30.24 inHg

Wind8.7 mph E

Humidity41%

Visibility—

Dew point30°

Tue, 2062° / 42°

62 °

Mendon, Tuesday, 20 October

Overcast. High 62°, low 42°.

Pressure30.03 inHg

Wind15.5 mph NW

Humidity39%

Visibility—

Dew point35°

Wed, 2158° / 36°

58 °

Mendon, Wednesday, 21 October

Clear. High 58°, low 36°.

Pressure30.12 inHg

Wind8 mph SE

Humidity42%

Visibility—

Dew point29°

From day 17 onward the outlook is built from 60-year climate statistics

Thu, 2264° / 48°

0.12

64 °

Mendon, Thursday, 22 October

Climate normal for this date — 60-year average.

Average high64°

Average low48°

Average precipitation0.12 in

Chance of precipitation32%

Record high83° (1963)

Record low30° (1976)

Fri, 2363° / 48°

0.11

63 °

Mendon, Friday, 23 October

Climate normal for this date — 60-year average.

Average high63°

Average low48°

Average precipitation0.11 in

Chance of precipitation35%

Record high82° (1963)

Record low31° (1981)

Sat, 2461° / 47°

0.13

61 °

Mendon, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high61°

Average low47°

Average precipitation0.13 in

Chance of precipitation33%

Record high82° (1963)

Record low28° (1981)

Sun, 2560° / 46°

0.11

60 °

Mendon, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high60°

Average low46°

Average precipitation0.11 in

Chance of precipitation25%

Record high78° (2011)

Record low31° (2013)

Mon, 2660° / 45°

0.1

60 °

Mendon, Monday, 26 October

Climate normal for this date — 60-year average.

Average high60°

Average low45°

Average precipitation0.1 in

Chance of precipitation37%

Record high82° (1963)

Record low27° (1962)

Tue, 2759° / 45°

0.07

59 °

Mendon, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high59°

Average low45°

Average precipitation0.07 in

Chance of precipitation23%

Record high76° (2014)

Record low29° (1997)

Wed, 2859° / 44°

0.05

59 °

Mendon, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high59°

Average low44°

Average precipitation0.05 in

Chance of precipitation22%

Record high77° (2016)

Record low28° (1969)

Thu, 2960° / 44°

0.07

60 °

Mendon, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high60°

Average low44°

Average precipitation0.07 in

Chance of precipitation25%

Record high81° (2024)

Record low26° (1980)

Fri, 3060° / 45°

0.13

60 °

Mendon, Friday, 30 October

Climate normal for this date — 60-year average.

Average high60°

Average low45°

Average precipitation0.13 in

Chance of precipitation35%

Record high78° (1971)

Record low28° (1980)

Sat, 3159° / 45°

0.19

59 °

Mendon, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high59°

Average low45°

Average precipitation0.19 in

Chance of precipitation42%

Record high77° (1968)

Record low27° (1993)

Sun, 0159° / 44°

0.2

59 °

Mendon, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high59°

Average low44°

Average precipitation0.2 in

Chance of precipitation30%

Record high78° (2000)

Record low25° (1993)

Mon, 0257° / 42°

0.1

57 °

Mendon, Monday, 2 November

Climate normal for this date — 60-year average.

Average high57°

Average low42°

Average precipitation0.1 in

Chance of precipitation32%

Record high76° (1964)

Record low24° (1991)

Tue, 0356° / 42°

0.14

56 °

Mendon, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high56°

Average low42°

Average precipitation0.14 in

Chance of precipitation30%

Record high75° (1987)

Record low17° (1991)

Wed, 0456° / 42°

0.1

56 °

Mendon, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high56°

Average low42°

Average precipitation0.1 in

Chance of precipitation28%

Record high75° (1978)

Record low15° (1991)

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 Mendon, 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 Mendon, 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.