As of 04:05 CDT

Weather in St. Johns, IL

56°

St. Johns, Sunday, 11 October, 04:05

Clear. Feels like 55°. High 83°, low 54°.

Pressure29.94 inHg

Wind4.6 mph N

Humidity88%

Visibility6.2 mi

Dew point52°

See detailed hourly forecast

Mon, 1291° / 60°

91 °

St. Johns, Monday, 12 October

Clear. High 91°, low 60°.

Pressure29.97 inHg

Wind10.6 mph SW

Humidity43%

Visibility6.2 mi

Dew point60°

Tue, 1390° / 67°

90 °

St. Johns, Tuesday, 13 October

Clear. High 90°, low 67°.

Pressure29.94 inHg

Wind8.8 mph SW

Humidity46%

Visibility6.2 mi

Dew point63°

Wed, 1479° / 72°

0.13

79 °

St. Johns, Wednesday, 14 October

Rain. High 79°, low 72°.

Pressure30.03 inHg

Wind3.5 mph SW

Humidity85%

Visibility6.2 mi

Dew point71°

Thu, 1582° / 70°

0.72

82 °

St. Johns, Thursday, 15 October

Rain. High 82°, low 70°.

Pressure30.06 inHg

Wind8.2 mph SW

Humidity79%

Visibility—

Dew point71°

Fri, 1671° / 49°

0.36

71 °

St. Johns, Friday, 16 October

Rain. High 71°, low 49°.

Pressure30.30 inHg

Wind18.6 mph N

Humidity53%

Visibility—

Dew point49°

Sat, 1745° / 34°

45 °

St. Johns, Saturday, 17 October

Overcast. High 45°, low 34°.

Pressure30.39 inHg

Wind21.4 mph NW

Humidity36%

Visibility—

Dew point18°

Sun, 1852° / 30°

52 °

St. Johns, Sunday, 18 October

Clear. High 52°, low 30°.

Pressure30.56 inHg

Wind8.9 mph NW

Humidity28%

Visibility—

Dew point16°

Mon, 1962° / 35°

62 °

St. Johns, Monday, 19 October

Clear. High 62°, low 35°.

Pressure30.39 inHg

Wind12.5 mph S

Humidity24%

Visibility—

Dew point19°

Tue, 2069° / 41°

69 °

St. Johns, Tuesday, 20 October

Clear. High 69°, low 41°.

Pressure30.27 inHg

Wind12.9 mph S

Humidity18%

Visibility—

Dew point19°

Wed, 2171° / 45°

71 °

St. Johns, Wednesday, 21 October

Overcast. High 71°, low 45°.

Pressure30.27 inHg

Wind12.1 mph S

Humidity24%

Visibility—

Dew point29°

Thu, 2274° / 51°

74 °

St. Johns, Thursday, 22 October

Mostly clear. High 74°, low 51°.

Pressure30.33 inHg

Wind7 mph N

Humidity35%

Visibility—

Dew point42°

Fri, 2376° / 53°

76 °

St. Johns, Friday, 23 October

Clear. High 76°, low 53°.

Pressure30.30 inHg

Wind7.8 mph E

Humidity45%

Visibility—

Dew point48°

Sat, 2474° / 54°

74 °

St. Johns, Saturday, 24 October

Overcast. High 74°, low 54°.

Pressure30.12 inHg

Wind13.4 mph NW

Humidity53%

Visibility—

Dew point53°

Sun, 2559° / 41°

59 °

St. Johns, Sunday, 25 October

Clear. High 59°, low 41°.

Pressure30.39 inHg

Wind10 mph NW

Humidity36%

Visibility—

Dew point29°

Mon, 2668° / 40°

68 °

St. Johns, Monday, 26 October

Clear. High 68°, low 40°.

Pressure30.15 inHg

Wind13.8 mph W

Humidity31%

Visibility—

Dew point30°

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.