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As of 12:58 CDT

Weather in Lake Petersburg, IL

86°Current weather

Lake Petersburg, Sunday, 9 August, 12:58

Mostly clear. Feels like 86°. High 90°, low 70°.

Pressure29.94 inHg
Wind15.2 mph S
Humidity39%
Visibility6.2 mi
Dew point76°
Mon, 1096° / 78°0Overcast
96 °Overcast

Lake Petersburg, Monday, 10 August

Overcast. High 96°, low 78°.

Pressure29.91 inHg
Wind10.9 mph SW
Humidity46%
Visibility6.2 mi
Dew point68°
Tue, 1198° / 71°0.27Rain
98 °Rain

Lake Petersburg, Tuesday, 11 August

Rain. High 98°, low 71°.

Pressure29.85 inHg
Wind15.9 mph SW
Humidity52%
Visibility6.2 mi
Dew point70°
Wed, 1292° / 71°0.17Rain
92 °Rain

Lake Petersburg, Wednesday, 12 August

Rain. High 92°, low 71°.

Pressure29.83 inHg
Wind4 mph NE
Humidity57%
Visibility6.2 mi
Dew point71°
Thu, 1380° / 69°2.33Heavy rain
80 °Heavy rain

Lake Petersburg, Thursday, 13 August

Heavy rain. High 80°, low 69°.

Pressure29.88 inHg
Wind6.5 mph SE
Humidity89%
Visibility6.2 mi
Dew point72°
Fri, 1476° / 67°0.49Rain
76 °Rain

Lake Petersburg, Friday, 14 August

Rain. High 76°, low 67°.

Pressure30.06 inHg
Wind13.5 mph E
Humidity87%
Visibility—
Dew point68°
Sat, 1585° / 67°0.07Light rain
85 °Light rain

Lake Petersburg, Saturday, 15 August

Light rain. High 85°, low 67°.

Pressure30.09 inHg
Wind14.2 mph SE
Humidity76%
Visibility—
Dew point70°
Sun, 1682° / 67°0Overcast
82 °Overcast

Lake Petersburg, Sunday, 16 August

Overcast. High 82°, low 67°.

Pressure30.03 inHg
Wind13.6 mph NW
Humidity78%
Visibility—
Dew point72°
Mon, 1778° / 61°0Partly cloudy
78 °Partly cloudy

Lake Petersburg, Monday, 17 August

Partly cloudy. High 78°, low 61°.

Pressure30.09 inHg
Wind8 mph NE
Humidity61%
Visibility—
Dew point60°
Tue, 1885° / 63°0Overcast
85 °Overcast

Lake Petersburg, Tuesday, 18 August

Overcast. High 85°, low 63°.

Pressure29.85 inHg
Wind13 mph S
Humidity65%
Visibility—
Dew point67°
Wed, 1982° / 66°0Partly cloudy
82 °Partly cloudy

Lake Petersburg, Wednesday, 19 August

Partly cloudy. High 82°, low 66°.

Pressure29.85 inHg
Wind12.5 mph NW
Humidity55%
Visibility—
Dew point63°
Thu, 2080° / 61°0Mostly clear
80 °Mostly clear

Lake Petersburg, Thursday, 20 August

Mostly clear. High 80°, low 61°.

Pressure29.97 inHg
Wind5.7 mph N
Humidity59%
Visibility—
Dew point61°
Fri, 2187° / 63°0Partly cloudy
87 °Partly cloudy

Lake Petersburg, Friday, 21 August

Partly cloudy. High 87°, low 63°.

Pressure29.83 inHg
Wind15 mph S
Humidity54%
Visibility—
Dew point62°
Sat, 2288° / 67°0Clear
88 °Clear

Lake Petersburg, Saturday, 22 August

Clear. High 88°, low 67°.

Pressure29.83 inHg
Wind13.8 mph NW
Humidity48%
Visibility—
Dew point63°
Sun, 2380° / 59°0Clear
80 °Clear

Lake Petersburg, Sunday, 23 August

Clear. High 80°, low 59°.

Pressure30.15 inHg
Wind7.7 mph SE
Humidity48%
Visibility—
Dew point54°
Mon, 2481° / 59°0Clear
81 °Clear

Lake Petersburg, Monday, 24 August

Clear. High 81°, low 59°.

Pressure30.21 inHg
Wind8 mph SE
Humidity45%
Visibility—
Dew point54°

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 Lake Petersburg, 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 Lake Petersburg, 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.