As of 10:23 CDT

Weather in St. Johns, IL

81°

St. Johns, Tuesday, 13 October, 10:23

Clear. Feels like 82°. High 90°, low 66°.

Pressure29.97 inHg

Wind7.3 mph SW

Humidity51%

Visibility6.2 mi

Dew point62°

See detailed hourly forecast

Wed, 1482° / 67°

0.31

82 °

St. Johns, Wednesday, 14 October

Rain. High 82°, low 67°.

Pressure30.03 inHg

Wind3.7 mph SW

Humidity95%

Visibility5.1 mi

Dew point72°

Thu, 1584° / 66°

0.37

84 °

St. Johns, Thursday, 15 October

Rain. High 84°, low 66°.

Pressure30.00 inHg

Wind12.1 mph SW

Humidity78%

Visibility6.2 mi

Dew point72°

Fri, 1672° / 54°

0.06

72 °

St. Johns, Friday, 16 October

Light rain. High 72°, low 54°.

Pressure30.24 inHg

Wind21 mph NW

Humidity41%

Visibility6.2 mi

Dew point35°

Sat, 1760° / 45°

60 °

St. Johns, Saturday, 17 October

Clear. High 60°, low 45°.

Pressure30.50 inHg

Wind11.9 mph N

Humidity48%

Visibility—

Dew point37°

Sun, 1866° / 44°

66 °

St. Johns, Sunday, 18 October

Clear. High 66°, low 44°.

Pressure30.36 inHg

Wind6.8 mph S

Humidity40%

Visibility—

Dew point37°

Mon, 1973° / 52°

73 °

St. Johns, Monday, 19 October

Overcast. High 73°, low 52°.

Pressure30.21 inHg

Wind7.7 mph SW

Humidity49%

Visibility—

Dew point50°

Tue, 2071° / 58°

0.11

71 °

St. Johns, Tuesday, 20 October

Light rain. High 71°, low 58°.

Pressure30.24 inHg

Wind6.6 mph SE

Humidity90%

Visibility—

Dew point61°

Wed, 2174° / 61°

0.12

74 °

St. Johns, Wednesday, 21 October

Light rain. High 74°, low 61°.

Pressure30.21 inHg

Wind9.3 mph S

Humidity85%

Visibility—

Dew point62°

Thu, 2282° / 65°

82 °

St. Johns, Thursday, 22 October

Overcast. High 82°, low 65°.

Pressure30.09 inHg

Wind19.1 mph S

Humidity44%

Visibility—

Dew point55°

Fri, 2380° / 66°

80 °

St. Johns, Friday, 23 October

Clear. High 80°, low 66°.

Pressure30.06 inHg

Wind21.5 mph SW

Humidity44%

Visibility—

Dew point54°

Sat, 2467° / 59°

67 °

St. Johns, Saturday, 24 October

Overcast. High 67°, low 59°.

Pressure30.33 inHg

Wind10.9 mph N

Humidity43%

Visibility—

Dew point39°

Sun, 2568° / 54°

68 °

St. Johns, Sunday, 25 October

Overcast. High 68°, low 54°.

Pressure30.27 inHg

Wind9.9 mph NW

Humidity46%

Visibility—

Dew point40°

Mon, 2661° / 48°

61 °

St. Johns, Monday, 26 October

Overcast. High 61°, low 48°.

Pressure30.21 inHg

Wind13.2 mph N

Humidity30%

Visibility—

Dew point28°

Tue, 2762° / 45°

62 °

St. Johns, Tuesday, 27 October

Overcast. High 62°, low 45°.

Pressure30.24 inHg

Wind7.2 mph E

Humidity34%

Visibility—

Dew point29°

Wed, 2869° / 47°

0.02

69 °

St. Johns, Wednesday, 28 October

Light rain. High 69°, low 47°.

Pressure30.12 inHg

Wind14.3 mph S

Humidity33%

Visibility—

Dew point31°

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.