As of 08:18 CDT

Weather in Derby, IL

76°

Derby, Wednesday, 14 October, 08:18

Light rain. Feels like 77°. High 81°, low 69°.

Pressure30.00 inHg

Wind8 mph SW

Humidity89%

Visibility6.2 mi

Dew point72°

See detailed hourly forecast

Thu, 1588° / 67°

0.39

88 °

Derby, Thursday, 15 October

Heavy rain. High 88°, low 67°.

Pressure30.00 inHg

Wind8.7 mph SW

Humidity65%

Visibility6.2 mi

Dew point72°

Fri, 1673° / 52°

0.02

73 °

Derby, Friday, 16 October

Light rain. High 73°, low 52°.

Pressure30.15 inHg

Wind17.3 mph NW

Humidity44%

Visibility6.2 mi

Dew point37°

Sat, 1759° / 46°

59 °

Derby, Saturday, 17 October

Clear. High 59°, low 46°.

Pressure30.53 inHg

Wind9.1 mph NE

Humidity51%

Visibility6.2 mi

Dew point38°

Sun, 1865° / 42°

65 °

Derby, Sunday, 18 October

Clear. High 65°, low 42°.

Pressure30.47 inHg

Wind6.3 mph E

Humidity40%

Visibility—

Dew point35°

Mon, 1970° / 47°

70 °

Derby, Monday, 19 October

Clear. High 70°, low 47°.

Pressure30.42 inHg

Wind7.5 mph SW

Humidity35%

Visibility—

Dew point37°

Tue, 2077° / 54°

77 °

Derby, Tuesday, 20 October

Overcast. High 77°, low 54°.

Pressure30.24 inHg

Wind7.2 mph SE

Humidity44%

Visibility—

Dew point51°

Wed, 2178° / 61°

78 °

Derby, Wednesday, 21 October

Overcast. High 78°, low 61°.

Pressure30.21 inHg

Wind5.9 mph SE

Humidity45%

Visibility—

Dew point52°

Thu, 2282° / 58°

0.02

82 °

Derby, Thursday, 22 October

Light rain. High 82°, low 58°.

Pressure30.09 inHg

Wind12.2 mph SW

Humidity37%

Visibility—

Dew point50°

Fri, 2380° / 63°

80 °

Derby, Friday, 23 October

Overcast. High 80°, low 63°.

Pressure30.12 inHg

Wind6.7 mph SE

Humidity59%

Visibility—

Dew point56°

Sat, 2485° / 59°

0.03

85 °

Derby, Saturday, 24 October

Light rain. High 85°, low 59°.

Pressure30.03 inHg

Wind14.5 mph SW

Humidity39%

Visibility—

Dew point55°

Sun, 2564° / 48°

0.01

64 °

Derby, Sunday, 25 October

Light rain. High 64°, low 48°.

Pressure30.39 inHg

Wind11.8 mph NW

Humidity22%

Visibility—

Dew point22°

Mon, 2667° / 41°

67 °

Derby, Monday, 26 October

Partly cloudy. High 67°, low 41°.

Pressure30.30 inHg

Wind7 mph W

Humidity19%

Visibility—

Dew point19°

Tue, 2769° / 45°

69 °

Derby, Tuesday, 27 October

Overcast. High 69°, low 45°.

Pressure30.12 inHg

Wind8.7 mph SW

Humidity17%

Visibility—

Dew point19°

Wed, 2877° / 53°

0.17

77 °

Derby, Wednesday, 28 October

Light rain. High 77°, low 53°.

Pressure29.88 inHg

Wind17.5 mph SW

Humidity28%

Visibility—

Dew point37°

Thu, 2964° / 48°

0.01

64 °

Derby, Thursday, 29 October

Light rain. High 64°, low 48°.

Pressure30.12 inHg

Wind13.9 mph W

Humidity37%

Visibility—

Dew point34°

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.