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As of 17:38 CDT

Weather in Chester, IL

88°Current weather

Chester, Saturday, 8 August, 17:38

Clear. Feels like 95°. High 89°, low 70°.

Pressure30.00 inHg
Wind2 mph SE
Humidity60%
Visibility6.2 mi
Dew point72°
Sun, 0994° / 71°0Mostly clear
94 °Mostly clear

Chester, Sunday, 9 August

Mostly clear. High 94°, low 71°.

Pressure30.00 inHg
Wind12 mph S
Humidity45%
Visibility6.2 mi
Dew point68°
Mon, 10101° / 74°0Clear
101 °Clear

Chester, Monday, 10 August

Clear. High 101°, low 74°.

Pressure29.97 inHg
Wind12.9 mph SW
Humidity39%
Visibility6.2 mi
Dew point68°
Tue, 11104° / 76°0.02Light rain
104 °Light rain

Chester, Tuesday, 11 August

Light rain. High 104°, low 76°.

Pressure29.91 inHg
Wind13.1 mph SW
Humidity33%
Visibility6.2 mi
Dew point65°
Wed, 1291° / 76°0.03Light rain
91 °Light rain

Chester, Wednesday, 12 August

Light rain. High 91°, low 76°.

Pressure29.85 inHg
Wind19 mph W
Humidity37%
Visibility6.2 mi
Dew point63°
Thu, 1380° / 71°0.34Light rain
80 °Light rain

Chester, Thursday, 13 August

Light rain. High 80°, low 71°.

Pressure29.85 inHg
Wind10.7 mph SE
Humidity88%
Visibility—
Dew point72°
Fri, 1481° / 63°0.03Light rain
81 °Light rain

Chester, Friday, 14 August

Light rain. High 81°, low 63°.

Pressure30.12 inHg
Wind11.7 mph NE
Humidity50%
Visibility—
Dew point59°
Sat, 1584° / 57°0Overcast
84 °Overcast

Chester, Saturday, 15 August

Overcast. High 84°, low 57°.

Pressure30.24 inHg
Wind9.2 mph E
Humidity38%
Visibility—
Dew point50°
Sun, 1682° / 62°0.06Light rain
82 °Light rain

Chester, Sunday, 16 August

Light rain. High 82°, low 62°.

Pressure30.21 inHg
Wind9.7 mph S
Humidity74%
Visibility—
Dew point62°
Mon, 1799° / 71°0.28Rain
99 °Rain

Chester, Monday, 17 August

Rain. High 99°, low 71°.

Pressure29.94 inHg
Wind18.4 mph S
Humidity47%
Visibility—
Dew point67°
Tue, 1893° / 73°0Overcast
93 °Overcast

Chester, Tuesday, 18 August

Overcast. High 93°, low 73°.

Pressure29.94 inHg
Wind11.3 mph N
Humidity49%
Visibility—
Dew point68°
Wed, 1993° / 73°0Mostly clear
93 °Mostly clear

Chester, Wednesday, 19 August

Mostly clear. High 93°, low 73°.

Pressure29.88 inHg
Wind10.6 mph S
Humidity49%
Visibility—
Dew point69°
Thu, 2092° / 74°0.08Light rain
92 °Light rain

Chester, Thursday, 20 August

Light rain. High 92°, low 74°.

Pressure29.85 inHg
Wind12.1 mph NW
Humidity47%
Visibility—
Dew point66°
Fri, 2184° / 71°0.05Light rain
84 °Light rain

Chester, Friday, 21 August

Light rain. High 84°, low 71°.

Pressure29.88 inHg
Wind11.5 mph N
Humidity70%
Visibility—
Dew point70°
Sat, 2289° / 66°0Overcast
89 °Overcast

Chester, Saturday, 22 August

Overcast. High 89°, low 66°.

Pressure29.91 inHg
Wind9.1 mph N
Humidity39%
Visibility—
Dew point57°
Sun, 2377° / 63°0Overcast
77 °Overcast

Chester, Sunday, 23 August

Overcast. High 77°, low 63°.

Pressure30.09 inHg
Wind10.6 mph NE
Humidity55%
Visibility—
Dew point56°

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 Chester, 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 Chester, 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.