As of 22:03 CDT

Weather in St. Johns, IL

69°

St. Johns, Wednesday, 14 October, 22:03

Overcast. Feels like 70°. High 78°, low 69°.

Pressure30.03 inHg

Wind3.8 mph E

Humidity93%

Visibility6.2 mi

Dew point67°

See detailed hourly forecast

Thu, 1581° / 68°

0.25

81 °

St. Johns, Thursday, 15 October

Rain. High 81°, low 68°.

Pressure30.00 inHg

Wind6.8 mph S

Humidity78%

Visibility6.2 mi

Dew point72°

Fri, 1668° / 52°

0.39

68 °

St. Johns, Friday, 16 October

Rain. High 68°, low 52°.

Pressure30.18 inHg

Wind18.1 mph NW

Humidity45%

Visibility6.2 mi

Dew point37°

Sat, 1758° / 44°

58 °

St. Johns, Saturday, 17 October

Clear. High 58°, low 44°.

Pressure30.56 inHg

Wind6.3 mph NE

Humidity53%

Visibility6.2 mi

Dew point38°

Sun, 1862° / 42°

62 °

St. Johns, Sunday, 18 October

Clear. High 62°, low 42°.

Pressure30.50 inHg

Wind4.8 mph SE

Humidity47%

Visibility6.2 mi

Dew point37°

Mon, 1967° / 44°

67 °

St. Johns, Monday, 19 October

Mostly clear. High 67°, low 44°.

Pressure30.39 inHg

Wind5.3 mph S

Humidity46%

Visibility—

Dew point42°

Tue, 2072° / 47°

72 °

St. Johns, Tuesday, 20 October

Mostly clear. High 72°, low 47°.

Pressure30.33 inHg

Wind6.4 mph SE

Humidity46%

Visibility—

Dew point44°

Wed, 2178° / 54°

78 °

St. Johns, Wednesday, 21 October

Clear. High 78°, low 54°.

Pressure30.30 inHg

Wind8 mph E

Humidity35%

Visibility—

Dew point44°

Thu, 2281° / 57°

81 °

St. Johns, Thursday, 22 October

Partly cloudy. High 81°, low 57°.

Pressure30.21 inHg

Wind9.8 mph S

Humidity35%

Visibility—

Dew point46°

Fri, 2379° / 63°

79 °

St. Johns, Friday, 23 October

Overcast. High 79°, low 63°.

Pressure30.12 inHg

Wind18 mph S

Humidity53%

Visibility—

Dew point54°

Sat, 2474° / 65°

0.27

74 °

St. Johns, Saturday, 24 October

Light rain. High 74°, low 65°.

Pressure30.21 inHg

Wind13.6 mph SW

Humidity69%

Visibility—

Dew point62°

Sun, 2566° / 61°

1.09

66 °

St. Johns, Sunday, 25 October

Rain. High 66°, low 61°.

Pressure30.12 inHg

Wind11.1 mph S

Humidity94%

Visibility—

Dew point63°

Mon, 2660° / 49°

0.49

60 °

St. Johns, Monday, 26 October

Rain. High 60°, low 49°.

Pressure30.15 inHg

Wind17.9 mph NW

Humidity49%

Visibility—

Dew point38°

Tue, 2763° / 44°

63 °

St. Johns, Tuesday, 27 October

Overcast. High 63°, low 44°.

Pressure30.12 inHg

Wind8.9 mph NE

Humidity37%

Visibility—

Dew point33°

Wed, 2864° / 48°

64 °

St. Johns, Wednesday, 28 October

Overcast. High 64°, low 48°.

Pressure29.88 inHg

Wind10.4 mph N

Humidity43%

Visibility—

Dew point39°

Thu, 2968° / 47°

68 °

St. Johns, Thursday, 29 October

Clear. High 68°, low 47°.

Pressure30.03 inHg

Wind12 mph NW

Humidity42%

Visibility—

Dew point41°

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. Johns, 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 St. Johns, 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.