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As of 19:16 CDT

Weather in Derby, IL

78°Current weather

Derby, Monday, 12 October, 19:16

Clear. Feels like 78°. High 89°, low 59°.

Pressure29.91 inHg
Wind8.1 mph S
Humidity65%
Visibility6.2 mi
Dew point64°
Tue, 1389° / 65°0Clear
89 °Clear

Derby, Tuesday, 13 October

Clear. High 89°, low 65°.

Pressure29.97 inHg
Wind9.1 mph SW
Humidity51%
Visibility6.2 mi
Dew point62°
Wed, 1481° / 72°0.37Rain
81 °Rain

Derby, Wednesday, 14 October

Rain. High 81°, low 72°.

Pressure30.03 inHg
Wind6.2 mph SW
Humidity75%
Visibility6.2 mi
Dew point72°
Thu, 1584° / 70°0.46Heavy rain
84 °Heavy rain

Derby, Thursday, 15 October

Heavy rain. High 84°, low 70°.

Pressure30.03 inHg
Wind8.5 mph SW
Humidity76%
Visibility6.2 mi
Dew point73°
Fri, 1673° / 54°0.03Light rain
73 °Light rain

Derby, Friday, 16 October

Light rain. High 73°, low 54°.

Pressure30.24 inHg
Wind17.7 mph NW
Humidity48%
Visibility6.2 mi
Dew point41°
Sat, 1761° / 45°0Clear
61 °Clear

Derby, Saturday, 17 October

Clear. High 61°, low 45°.

Pressure30.50 inHg
Wind9.6 mph N
Humidity50%
Visibility—
Dew point39°
Sun, 1871° / 42°0Clear
71 °Clear

Derby, Sunday, 18 October

Clear. High 71°, low 42°.

Pressure30.33 inHg
Wind10.1 mph S
Humidity38%
Visibility—
Dew point39°
Mon, 1967° / 49°0Partly cloudy
67 °Partly cloudy

Derby, Monday, 19 October

Partly cloudy. High 67°, low 49°.

Pressure30.36 inHg
Wind9.2 mph S
Humidity53%
Visibility—
Dew point43°
Tue, 2075° / 59°0Overcast
75 °Overcast

Derby, Tuesday, 20 October

Overcast. High 75°, low 59°.

Pressure30.27 inHg
Wind6.2 mph SE
Humidity47%
Visibility—
Dew point51°
Wed, 2178° / 56°0Clear
78 °Clear

Derby, Wednesday, 21 October

Clear. High 78°, low 56°.

Pressure30.21 inHg
Wind5.9 mph SE
Humidity42%
Visibility—
Dew point49°
Thu, 2280° / 56°0Overcast
80 °Overcast

Derby, Thursday, 22 October

Overcast. High 80°, low 56°.

Pressure30.15 inHg
Wind7 mph SE
Humidity33%
Visibility—
Dew point44°
Fri, 2379° / 61°0Overcast
79 °Overcast

Derby, Friday, 23 October

Overcast. High 79°, low 61°.

Pressure30.06 inHg
Wind14 mph S
Humidity39%
Visibility—
Dew point49°
Sat, 2471° / 54°0.12Light rain
71 °Light rain

Derby, Saturday, 24 October

Light rain. High 71°, low 54°.

Pressure29.88 inHg
Wind17.1 mph SW
Humidity76%
Visibility—
Dew point58°
Sun, 2562° / 45°0Clear
62 °Clear

Derby, Sunday, 25 October

Clear. High 62°, low 45°.

Pressure30.06 inHg
Wind7.7 mph N
Humidity47%
Visibility—
Dew point38°
Mon, 2667° / 43°0Clear
67 °Clear

Derby, Monday, 26 October

Clear. High 67°, low 43°.

Pressure30.15 inHg
Wind5.1 mph E
Humidity41%
Visibility—
Dew point38°
Tue, 2774° / 49°0Partly cloudy
74 °Partly cloudy

Derby, Tuesday, 27 October

Partly cloudy. High 74°, low 49°.

Pressure29.97 inHg
Wind10.3 mph SW
Humidity29%
Visibility—
Dew point36°

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.