As of 03:59 CDT

Weather in St. Johns, IL

66°

St. Johns, Monday, 12 October, 03:59

Overcast. Feels like 66°. High 92°, low 64°.

Pressure29.97 inHg

Wind7.5 mph SW

Humidity78%

Visibility6.2 mi

Dew point59°

See detailed hourly forecast

Tue, 1394° / 65°

94 °

St. Johns, Tuesday, 13 October

Clear. High 94°, low 65°.

Pressure29.94 inHg

Wind8.2 mph SW

Humidity49%

Visibility6.2 mi

Dew point64°

Wed, 1482° / 72°

0.21

82 °

St. Johns, Wednesday, 14 October

Rain. High 82°, low 72°.

Pressure30.03 inHg

Wind6.5 mph SW

Humidity93%

Visibility5.1 mi

Dew point73°

Thu, 1581° / 70°

0.41

81 °

St. Johns, Thursday, 15 October

Rain. High 81°, low 70°.

Pressure30.06 inHg

Wind7.2 mph S

Humidity81%

Visibility6.0 mi

Dew point73°

Fri, 1672° / 54°

0.02

72 °

St. Johns, Friday, 16 October

Light rain. High 72°, low 54°.

Pressure30.36 inHg

Wind17.7 mph N

Humidity42%

Visibility—

Dew point39°

Sat, 1763° / 45°

63 °

St. Johns, Saturday, 17 October

Clear. High 63°, low 45°.

Pressure30.45 inHg

Wind8.7 mph NE

Humidity43%

Visibility—

Dew point36°

Sun, 1868° / 39°

68 °

St. Johns, Sunday, 18 October

Clear. High 68°, low 39°.

Pressure30.33 inHg

Wind8.5 mph S

Humidity24%

Visibility—

Dew point23°

Mon, 1974° / 50°

74 °

St. Johns, Monday, 19 October

Clear. High 74°, low 50°.

Pressure30.27 inHg

Wind12.6 mph S

Humidity49%

Visibility—

Dew point50°

Tue, 2066° / 58°

0.2

66 °

St. Johns, Tuesday, 20 October

Light rain. High 66°, low 58°.

Pressure30.27 inHg

Wind7.8 mph E

Humidity92%

Visibility—

Dew point59°

Wed, 2178° / 57°

78 °

St. Johns, Wednesday, 21 October

Clear. High 78°, low 57°.

Pressure30.24 inHg

Wind10.5 mph E

Humidity48%

Visibility—

Dew point53°

Thu, 2281° / 57°

81 °

St. Johns, Thursday, 22 October

Mostly clear. High 81°, low 57°.

Pressure30.27 inHg

Wind7 mph E

Humidity40%

Visibility—

Dew point50°

Fri, 2379° / 63°

79 °

St. Johns, Friday, 23 October

Overcast. High 79°, low 63°.

Pressure30.24 inHg

Wind12.8 mph SW

Humidity43%

Visibility—

Dew point53°

Sat, 2473° / 58°

73 °

St. Johns, Saturday, 24 October

Overcast. High 73°, low 58°.

Pressure30.30 inHg

Wind11.9 mph E

Humidity33%

Visibility—

Dew point38°

Sun, 2579° / 60°

0.02

79 °

St. Johns, Sunday, 25 October

Light rain. High 79°, low 60°.

Pressure29.88 inHg

Wind21.7 mph SW

Humidity49%

Visibility—

Dew point53°

Mon, 2661° / 58°

61 °

St. Johns, Monday, 26 October

Overcast. High 61°, low 58°.

Pressure30.03 inHg

Wind13.4 mph NW

Humidity67%

Visibility—

Dew point48°

Tue, 2767° / 46°

67 °

St. Johns, Tuesday, 27 October

Partly cloudy. High 67°, low 46°.

Pressure30.09 inHg

Wind8.9 mph NE

Humidity42%

Visibility—

Dew point39°

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.