As of 03:49 CDT

Weather in St. Clair, MO

61°

St. Clair, Friday, 9 October, 03:49

Clear. Feels like 60°. High 89°, low 57°.

Pressure30.06 inHg

Wind5.3 mph S

Humidity66%

Visibility6.2 mi

Dew point49°

See detailed hourly forecast

Monthly outlook for St. Clair, MO: average high 76°, average low 52.6°. That is 5° above the climate normal for October. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 13 October (94.8°), the coolest 18 October (35.8°).

76°/52.6°

Average high / low

+5°

Above normal

2 / 5

Wet days / normal

0.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	79.5°	68.1°	+6.3°
19 October – 28 October	70.2°	64°	+3.5°
29 October – 7 November	at normal	59.7°	—

October records over 66 years

91.6°10 October 1963All-time high

27.1°24 October 1981All-time low

Climate normals and records are computed from the nearest reference point — Sullivan (13 mi).

Sat, 1080° / 54°

80 °

St. Clair, Saturday, 10 October

Overcast. High 80°, low 54°.

Pressure30.03 inHg

Wind3.5 mph E

Humidity39%

Visibility6.2 mi

Dew point53°

Sun, 1189° / 61°

89 °

St. Clair, Sunday, 11 October

Clear. High 89°, low 61°.

Pressure29.94 inHg

Wind1.4 mph W

Humidity34%

Visibility6.2 mi

Dew point51°

Mon, 1294° / 69°

94 °

St. Clair, Monday, 12 October

Clear. High 94°, low 69°.

Pressure29.88 inHg

Wind10.7 mph SW

Humidity35%

Visibility6.2 mi

Dew point58°

Tue, 1395° / 72°

95 °

St. Clair, Tuesday, 13 October

Clear. High 95°, low 72°.

Pressure29.83 inHg

Wind11.7 mph SW

Humidity39%

Visibility—

Dew point61°

Wed, 1485° / 68°

0.46

85 °

St. Clair, Wednesday, 14 October

Rain. High 85°, low 68°.

Pressure29.83 inHg

Wind9.4 mph SW

Humidity62%

Visibility—

Dew point69°

Thu, 1590° / 67°

0.23

90 °

St. Clair, Thursday, 15 October

Light rain. High 90°, low 67°.

Pressure29.77 inHg

Wind16.7 mph SW

Humidity41%

Visibility—

Dew point61°

Fri, 1660° / 48°

60 °

St. Clair, Friday, 16 October

Overcast. High 60°, low 48°.

Pressure30.21 inHg

Wind16.9 mph NW

Humidity34%

Visibility—

Dew point29°

Sat, 1753° / 39°

53 °

St. Clair, Saturday, 17 October

Clear. High 53°, low 39°.

Pressure30.36 inHg

Wind12.1 mph NW

Humidity39%

Visibility—

Dew point27°

Sun, 1859° / 36°

59 °

St. Clair, Sunday, 18 October

Partly cloudy. High 59°, low 36°.

Pressure30.33 inHg

Wind3.7 mph E

Humidity38%

Visibility—

Dew point29°

Mon, 1966° / 40°

66 °

St. Clair, Monday, 19 October

Clear. High 66°, low 40°.

Pressure30.30 inHg

Wind5.4 mph E

Humidity35%

Visibility—

Dew point32°

Tue, 2068° / 43°

68 °

St. Clair, Tuesday, 20 October

Clear. High 68°, low 43°.

Pressure30.30 inHg

Wind6.2 mph E

Humidity34%

Visibility—

Dew point34°

Wed, 2172° / 45°

72 °

St. Clair, Wednesday, 21 October

Clear. High 72°, low 45°.

Pressure30.24 inHg

Wind4.7 mph E

Humidity32%

Visibility—

Dew point35°

Thu, 2272° / 47°

72 °

St. Clair, Thursday, 22 October

Clear. High 72°, low 47°.

Pressure30.21 inHg

Wind5.1 mph NE

Humidity32%

Visibility—

Dew point37°

Fri, 2371° / 47°

71 °

St. Clair, Friday, 23 October

Clear. High 71°, low 47°.

Pressure30.15 inHg

Wind5.5 mph N

Humidity35%

Visibility—

Dew point38°

Sat, 2472° / 48°

72 °

St. Clair, Saturday, 24 October

Clear. High 72°, low 48°.

Pressure30.06 inHg

Wind4 mph NE

Humidity41%

Visibility—

Dew point43°

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

Sun, 2562° / 47°

0.13

62 °

St. Clair, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high62°

Average low47°

Average precipitation0.13 in

Chance of precipitation30%

Record high81° (2023)

Record low30° (2013)

Mon, 2662° / 46°

0.13

62 °

St. Clair, Monday, 26 October

Climate normal for this date — 60-year average.

Average high62°

Average low46°

Average precipitation0.13 in

Chance of precipitation33%

Record high82° (1963)

Record low31° (1962)

Tue, 2762° / 46°

0.11

62 °

St. Clair, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high62°

Average low46°

Average precipitation0.11 in

Chance of precipitation30%

Record high82° (2023)

Record low32° (2001)

Wed, 2862° / 45°

0.06

62 °

St. Clair, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high62°

Average low45°

Average precipitation0.06 in

Chance of precipitation25%

Record high79° (1999)

Record low31° (1969)

Thu, 2962° / 46°

0.13

62 °

St. Clair, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high62°

Average low46°

Average precipitation0.13 in

Chance of precipitation28%

Record high81° (2024)

Record low27° (2017)

Fri, 3063° / 47°

0.13

63 °

St. Clair, Friday, 30 October

Climate normal for this date — 60-year average.

Average high63°

Average low47°

Average precipitation0.13 in

Chance of precipitation28%

Record high80° (1971)

Record low28° (1980)

Sat, 3162° / 47°

0.15

62 °

St. Clair, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high62°

Average low47°

Average precipitation0.15 in

Chance of precipitation40%

Record high80° (1968)

Record low27° (2023)

Sun, 0161° / 46°

0.17

61 °

St. Clair, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high61°

Average low46°

Average precipitation0.17 in

Chance of precipitation32%

Record high79° (2016)

Record low24° (2023)

Mon, 0260° / 44°

0.1

60 °

St. Clair, Monday, 2 November

Climate normal for this date — 60-year average.

Average high60°

Average low44°

Average precipitation0.1 in

Chance of precipitation30%

Record high79° (2016)

Record low26° (1966)

Tue, 0359° / 43°

0.13

59 °

St. Clair, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high59°

Average low43°

Average precipitation0.13 in

Chance of precipitation28%

Record high78° (1987)

Record low18° (1991)

Wed, 0458° / 44°

0.16

58 °

St. Clair, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high58°

Average low44°

Average precipitation0.16 in

Chance of precipitation25%

Record high79° (1978)

Record low17° (1991)

Thu, 0557° / 42°

0.17

57 °

St. Clair, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high57°

Average low42°

Average precipitation0.17 in

Chance of precipitation37%

Record high78° (1978)

Record low25° (1976)

Fri, 0658° / 42°

0.09

58 °

St. Clair, Friday, 6 November

Climate normal for this date — 60-year average.

Average high58°

Average low42°

Average precipitation0.09 in

Chance of precipitation28%

Record high78° (2023)

Record low26° (1993)

Sat, 0758° / 42°

0.09

58 °

St. Clair, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high58°

Average low42°

Average precipitation0.09 in

Chance of precipitation17%

Record high77° (2023)

Record low20° (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 St. Clair, MO 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 St. Clair, MO 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.