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As of 16:57 CDT

Weather in Derby, IL

88°Current weather

Derby, Saturday, 8 August, 16:57

Overcast. Feels like 97°. High 88°, low 73°.

Pressure30.00 inHg
Wind7.2 mph S
Humidity66%
Visibility6.2 mi
Dew point75°
Sun, 0991° / 74°0Clear
91 °Clear

Derby, Sunday, 9 August

Clear. High 91°, low 74°.

Pressure30.03 inHg
Wind10.8 mph S
Humidity47%
Visibility6.2 mi
Dew point66°
Mon, 1096° / 75°0Clear
96 °Clear

Derby, Monday, 10 August

Clear. High 96°, low 75°.

Pressure30.03 inHg
Wind12.8 mph SW
Humidity47%
Visibility6.2 mi
Dew point70°
Tue, 1199° / 75°0Light rain
99 °Light rain

Derby, Tuesday, 11 August

Light rain. High 99°, low 75°.

Pressure29.94 inHg
Wind14.1 mph SW
Humidity42%
Visibility6.2 mi
Dew point68°
Wed, 1297° / 78°0Overcast
97 °Overcast

Derby, Wednesday, 12 August

Overcast. High 97°, low 78°.

Pressure29.83 inHg
Wind15.2 mph W
Humidity39%
Visibility6.2 mi
Dew point67°
Thu, 1387° / 71°0.24Rain
87 °Rain

Derby, Thursday, 13 August

Rain. High 87°, low 71°.

Pressure29.91 inHg
Wind8.4 mph SW
Humidity72%
Visibility—
Dew point70°
Fri, 1481° / 64°0.87Heavy rain
81 °Heavy rain

Derby, Friday, 14 August

Heavy rain. High 81°, low 64°.

Pressure30.09 inHg
Wind10.6 mph NE
Humidity60%
Visibility—
Dew point63°
Sat, 1579° / 57°0Overcast
79 °Overcast

Derby, Saturday, 15 August

Overcast. High 79°, low 57°.

Pressure30.27 inHg
Wind7.4 mph E
Humidity42%
Visibility—
Dew point51°
Sun, 1685° / 60°0.01Light rain
85 °Light rain

Derby, Sunday, 16 August

Light rain. High 85°, low 60°.

Pressure30.21 inHg
Wind6 mph SE
Humidity38%
Visibility—
Dew point52°
Mon, 1786° / 69°0.19Light rain
86 °Light rain

Derby, Monday, 17 August

Light rain. High 86°, low 69°.

Pressure30.00 inHg
Wind16.7 mph SW
Humidity62%
Visibility—
Dew point69°
Tue, 1893° / 72°0Overcast
93 °Overcast

Derby, Tuesday, 18 August

Overcast. High 93°, low 72°.

Pressure29.94 inHg
Wind11 mph S
Humidity54%
Visibility—
Dew point70°
Wed, 1991° / 71°0Mostly clear
91 °Mostly clear

Derby, Wednesday, 19 August

Mostly clear. High 91°, low 71°.

Pressure29.91 inHg
Wind7 mph E
Humidity50%
Visibility—
Dew point67°
Thu, 2088° / 74°0.62Rain
88 °Rain

Derby, Thursday, 20 August

Rain. High 88°, low 74°.

Pressure29.85 inHg
Wind10.6 mph W
Humidity59%
Visibility—
Dew point70°
Fri, 2183° / 71°0.16Light rain
83 °Light rain

Derby, Friday, 21 August

Light rain. High 83°, low 71°.

Pressure29.88 inHg
Wind7.4 mph N
Humidity74%
Visibility—
Dew point73°
Sat, 2286° / 67°0Overcast
86 °Overcast

Derby, Saturday, 22 August

Overcast. High 86°, low 67°.

Pressure29.91 inHg
Wind7.7 mph NE
Humidity52%
Visibility—
Dew point63°
Sun, 2378° / 64°0Overcast
78 °Overcast

Derby, Sunday, 23 August

Overcast. High 78°, low 64°.

Pressure30.06 inHg
Wind10.9 mph NE
Humidity60%
Visibility—
Dew point60°

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 Derby, 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 Derby, 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.