As of 20:59 CDT

Weather in St. Johns, IL

64°

St. Johns, Saturday, 10 October, 20:59

Overcast. Feels like 63°. High 76°, low 56°.

Pressure30.00 inHg

Wind5.5 mph NE

Humidity70%

Visibility6.2 mi

Dew point54°

See detailed hourly forecast

Sun, 1185° / 52°

85 °

St. Johns, Sunday, 11 October

Clear. High 85°, low 52°.

Pressure30.03 inHg

Wind3 mph NW

Humidity51%

Visibility6.2 mi

Dew point56°

Mon, 1291° / 60°

91 °

St. Johns, Monday, 12 October

Clear. High 91°, low 60°.

Pressure29.97 inHg

Wind10.1 mph SW

Humidity45%

Visibility6.2 mi

Dew point61°

Tue, 1389° / 67°

89 °

St. Johns, Tuesday, 13 October

Clear. High 89°, low 67°.

Pressure29.94 inHg

Wind9.3 mph SW

Humidity45%

Visibility6.2 mi

Dew point61°

Wed, 1479° / 71°

0.46

79 °

St. Johns, Wednesday, 14 October

Rain. High 79°, low 71°.

Pressure30.00 inHg

Wind5 mph SW

Humidity85%

Visibility6.2 mi

Dew point70°

Thu, 1575° / 64°

0.76

75 °

St. Johns, Thursday, 15 October

Rain. High 75°, low 64°.

Pressure30.15 inHg

Wind9.7 mph NE

Humidity73%

Visibility—

Dew point64°

Fri, 1666° / 46°

0.27

66 °

St. Johns, Friday, 16 October

Rain. High 66°, low 46°.

Pressure30.27 inHg

Wind19 mph NW

Humidity51%

Visibility—

Dew point47°

Sat, 1747° / 36°

47 °

St. Johns, Saturday, 17 October

Overcast. High 47°, low 36°.

Pressure30.47 inHg

Wind20.1 mph NW

Humidity38%

Visibility—

Dew point20°

Sun, 1853° / 31°

53 °

St. Johns, Sunday, 18 October

Partly cloudy. High 53°, low 31°.

Pressure30.65 inHg

Wind7.2 mph N

Humidity31%

Visibility—

Dew point19°

Mon, 1962° / 35°

62 °

St. Johns, Monday, 19 October

Clear. High 62°, low 35°.

Pressure30.53 inHg

Wind8 mph S

Humidity21%

Visibility—

Dew point16°

Tue, 2067° / 40°

67 °

St. Johns, Tuesday, 20 October

Clear. High 67°, low 40°.

Pressure30.39 inHg

Wind8.8 mph S

Humidity21%

Visibility—

Dew point21°

Wed, 2171° / 44°

71 °

St. Johns, Wednesday, 21 October

Clear. High 71°, low 44°.

Pressure30.21 inHg

Wind14.4 mph SW

Humidity22%

Visibility—

Dew point26°

Thu, 2273° / 49°

73 °

St. Johns, Thursday, 22 October

Clear. High 73°, low 49°.

Pressure30.15 inHg

Wind10.1 mph W

Humidity40%

Visibility—

Dew point44°

Fri, 2369° / 47°

69 °

St. Johns, Friday, 23 October

Clear. High 69°, low 47°.

Pressure30.27 inHg

Wind7.9 mph N

Humidity35%

Visibility—

Dew point36°

Sat, 2463° / 47°

63 °

St. Johns, Saturday, 24 October

Overcast. High 63°, low 47°.

Pressure30.33 inHg

Wind8.8 mph E

Humidity43%

Visibility—

Dew point37°

Sun, 2570° / 50°

0.02

70 °

St. Johns, Sunday, 25 October

Light rain. High 70°, low 50°.

Pressure30.27 inHg

Wind10 mph E

Humidity43%

Visibility—

Dew point36°

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.