As of 15:53 CDT

Weather in St. Johns, IL

88°

St. Johns, Saturday, 8 August, 15:53

Clear. Feels like 96°. High 88°, low 71°.

Pressure30.00 inHg

Wind6.2 mph SW

Humidity62%

Visibility6.2 mi

Dew point73°

See detailed hourly forecast

Sun, 0993° / 72°

93 °

St. Johns, Sunday, 9 August

Mostly clear. High 93°, low 72°.

Pressure30.00 inHg

Wind13 mph SW

Humidity54%

Visibility6.2 mi

Dew point69°

Mon, 1096° / 75°

96 °

St. Johns, Monday, 10 August

Clear. High 96°, low 75°.

Pressure30.00 inHg

Wind14.3 mph SW

Humidity50%

Visibility6.2 mi

Dew point71°

Tue, 11102° / 77°

102 °

St. Johns, Tuesday, 11 August

Mostly clear. High 102°, low 77°.

Pressure29.91 inHg

Wind13.3 mph SW

Humidity42%

Visibility6.2 mi

Dew point69°

Wed, 1290° / 74°

0.06

90 °

St. Johns, Wednesday, 12 August

Light rain. High 90°, low 74°.

Pressure29.85 inHg

Wind15.1 mph W

Humidity41%

Visibility6.2 mi

Dew point68°

Thu, 1379° / 71°

0.17

79 °

St. Johns, Thursday, 13 August

Light rain. High 79°, low 71°.

Pressure29.88 inHg

Wind8.5 mph S

Humidity89%

Visibility—

Dew point71°

Fri, 1479° / 63°

0.06

79 °

St. Johns, Friday, 14 August

Light rain. High 79°, low 63°.

Pressure30.12 inHg

Wind12.1 mph NE

Humidity53%

Visibility—

Dew point59°

Sat, 1581° / 57°

81 °

St. Johns, Saturday, 15 August

Partly cloudy. High 81°, low 57°.

Pressure30.27 inHg

Wind9.7 mph E

Humidity41%

Visibility—

Dew point50°

Sun, 1684° / 60°

0.02

84 °

St. Johns, Sunday, 16 August

Light rain. High 84°, low 60°.

Pressure30.18 inHg

Wind7.6 mph SW

Humidity43%

Visibility—

Dew point56°

Mon, 1792° / 70°

0.25

92 °

St. Johns, Monday, 17 August

Rain. High 92°, low 70°.

Pressure29.97 inHg

Wind18.5 mph SW

Humidity59%

Visibility—

Dew point70°

Tue, 1890° / 73°

90 °

St. Johns, Tuesday, 18 August

Overcast. High 90°, low 73°.

Pressure29.94 inHg

Wind10.6 mph S

Humidity59%

Visibility—

Dew point71°

Wed, 1993° / 72°

93 °

St. Johns, Wednesday, 19 August

Partly cloudy. High 93°, low 72°.

Pressure29.91 inHg

Wind7.2 mph SE

Humidity48%

Visibility—

Dew point67°

Thu, 2090° / 74°

0.1

90 °

St. Johns, Thursday, 20 August

Light rain. High 90°, low 74°.

Pressure29.85 inHg

Wind13.9 mph NW

Humidity54%

Visibility—

Dew point68°

Fri, 2183° / 71°

0.14

83 °

St. Johns, Friday, 21 August

Light rain. High 83°, low 71°.

Pressure29.88 inHg

Wind10.5 mph NE

Humidity74%

Visibility—

Dew point72°

Sat, 2284° / 66°

84 °

St. Johns, Saturday, 22 August

Overcast. High 84°, low 66°.

Pressure29.91 inHg

Wind7.9 mph N

Humidity52%

Visibility—

Dew point62°

Sun, 2377° / 63°

77 °

St. Johns, Sunday, 23 August

Overcast. High 77°, low 63°.

Pressure30.09 inHg

Wind13 mph NE

Humidity59%

Visibility—

Dew point57°

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.