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As of 09:41 CDT

Weather in Derby, IL

65°Current weather

Derby, Sunday, 11 October, 09:41

Overcast. Feels like 65°. High 81°, low 58°.

Pressure30.03 inHg
Wind7.3 mph NW
Humidity83%
Visibility6.2 mi
Dew point59°
Mon, 1287° / 64°0Clear
87 °Clear

Derby, Monday, 12 October

Clear. High 87°, low 64°.

Pressure30.00 inHg
Wind10.2 mph SW
Humidity50%
Visibility6.2 mi
Dew point62°
Tue, 1387° / 67°0Clear
87 °Clear

Derby, Tuesday, 13 October

Clear. High 87°, low 67°.

Pressure29.97 inHg
Wind9.7 mph SW
Humidity47%
Visibility6.2 mi
Dew point61°
Wed, 1480° / 72°0.18Rain
80 °Rain

Derby, Wednesday, 14 October

Rain. High 80°, low 72°.

Pressure30.06 inHg
Wind4.4 mph W
Humidity95%
Visibility1.7 mi
Dew point74°
Thu, 1583° / 70°0.65Rain
83 °Rain

Derby, Thursday, 15 October

Rain. High 83°, low 70°.

Pressure30.03 inHg
Wind9.9 mph SW
Humidity69%
Visibility—
Dew point70°
Fri, 1675° / 56°0.14Rain
75 °Rain

Derby, Friday, 16 October

Rain. High 75°, low 56°.

Pressure30.24 inHg
Wind16.4 mph N
Humidity50%
Visibility—
Dew point48°
Sat, 1751° / 36°0Clear
51 °Clear

Derby, Saturday, 17 October

Clear. High 51°, low 36°.

Pressure30.53 inHg
Wind14.2 mph N
Humidity22%
Visibility—
Dew point9°
Sun, 1857° / 31°0Clear
57 °Clear

Derby, Sunday, 18 October

Clear. High 57°, low 31°.

Pressure30.59 inHg
Wind7.1 mph S
Humidity23%
Visibility—
Dew point14°
Mon, 1966° / 36°0Clear
66 °Clear

Derby, Monday, 19 October

Clear. High 66°, low 36°.

Pressure30.47 inHg
Wind10.2 mph SW
Humidity23%
Visibility—
Dew point22°
Tue, 2068° / 42°0Partly cloudy
68 °Partly cloudy

Derby, Tuesday, 20 October

Partly cloudy. High 68°, low 42°.

Pressure30.36 inHg
Wind6.1 mph S
Humidity24%
Visibility—
Dew point27°
Wed, 2174° / 49°0Overcast
74 °Overcast

Derby, Wednesday, 21 October

Overcast. High 74°, low 49°.

Pressure30.27 inHg
Wind6.7 mph S
Humidity25%
Visibility—
Dew point32°
Thu, 2276° / 49°0Clear
76 °Clear

Derby, Thursday, 22 October

Clear. High 76°, low 49°.

Pressure30.24 inHg
Wind4.5 mph S
Humidity24%
Visibility—
Dew point32°
Fri, 2378° / 53°0Partly cloudy
78 °Partly cloudy

Derby, Friday, 23 October

Partly cloudy. High 78°, low 53°.

Pressure30.18 inHg
Wind2.6 mph SW
Humidity25%
Visibility—
Dew point36°
Sat, 2481° / 57°0Clear
81 °Clear

Derby, Saturday, 24 October

Clear. High 81°, low 57°.

Pressure30.12 inHg
Wind4 mph NW
Humidity31%
Visibility—
Dew point44°
Sun, 2580° / 62°0Overcast
80 °Overcast

Derby, Sunday, 25 October

Overcast. High 80°, low 62°.

Pressure29.97 inHg
Wind10.8 mph SW
Humidity41%
Visibility—
Dew point52°
Mon, 2664° / 47°0.07Light rain
64 °Light rain

Derby, Monday, 26 October

Light rain. High 64°, low 47°.

Pressure29.91 inHg
Wind12.8 mph NW
Humidity28%
Visibility—
Dew point28°

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.