As of 14:01 CDT

Weather in Derby, IL

57°

Derby, Saturday, 17 October, 14:01

Clear. Feels like 54°. High 57°, low 45°.

Pressure30.47 inHg

Wind8.5 mph N

Humidity50%

Visibility6.2 mi

Dew point37°

See detailed hourly forecast

Sun, 1865° / 41°

65 °

Derby, Sunday, 18 October

Clear. High 65°, low 41°.

Pressure30.50 inHg

Wind5.3 mph SE

Humidity41%

Visibility6.2 mi

Dew point36°

Mon, 1970° / 44°

70 °

Derby, Monday, 19 October

Clear. High 70°, low 44°.

Pressure30.39 inHg

Wind1.2 mph NE

Humidity43%

Visibility6.2 mi

Dew point44°

Tue, 2070° / 45°

70 °

Derby, Tuesday, 20 October

Clear. High 70°, low 45°.

Pressure30.36 inHg

Wind3.3 mph NE

Humidity46%

Visibility6.2 mi

Dew point46°

Wed, 2172° / 46°

72 °

Derby, Wednesday, 21 October

Clear. High 72°, low 46°.

Pressure30.27 inHg

Wind2.9 mph NE

Humidity43%

Visibility6.2 mi

Dew point44°

Thu, 2272° / 48°

72 °

Derby, Thursday, 22 October

Mostly clear. High 72°, low 48°.

Pressure30.24 inHg

Wind4.3 mph NE

Humidity38%

Visibility—

Dew point42°

Fri, 2376° / 52°

76 °

Derby, Friday, 23 October

Clear. High 76°, low 52°.

Pressure30.15 inHg

Wind6 mph E

Humidity29%

Visibility—

Dew point37°

Sat, 2475° / 53°

75 °

Derby, Saturday, 24 October

Overcast. High 75°, low 53°.

Pressure30.18 inHg

Wind6.5 mph S

Humidity27%

Visibility—

Dew point36°

Sun, 2579° / 58°

79 °

Derby, Sunday, 25 October

Overcast. High 79°, low 58°.

Pressure30.15 inHg

Wind12 mph SW

Humidity38%

Visibility—

Dew point46°

Mon, 2681° / 58°

81 °

Derby, Monday, 26 October

Partly cloudy. High 81°, low 58°.

Pressure30.15 inHg

Wind6.2 mph SW

Humidity45%

Visibility—

Dew point52°

Tue, 2776° / 60°

76 °

Derby, Tuesday, 27 October

Overcast. High 76°, low 60°.

Pressure30.15 inHg

Wind10.3 mph S

Humidity36%

Visibility—

Dew point44°

Wed, 2871° / 60°

0.05

71 °

Derby, Wednesday, 28 October

Light rain. High 71°, low 60°.

Pressure30.06 inHg

Wind15.6 mph SW

Humidity44%

Visibility—

Dew point47°

Thu, 2962° / 59°

0.22

62 °

Derby, Thursday, 29 October

Light rain. High 62°, low 59°.

Pressure30.06 inHg

Wind10.6 mph SW

Humidity94%

Visibility—

Dew point59°

Fri, 3079° / 62°

0.03

79 °

Derby, Friday, 30 October

Light rain. High 79°, low 62°.

Pressure29.85 inHg

Wind15.9 mph S

Humidity57%

Visibility—

Dew point60°

Sat, 3172° / 53°

1.2

72 °

Derby, Saturday, 31 October

Heavy rain. High 72°, low 53°.

Pressure29.83 inHg

Wind17.5 mph S

Humidity95%

Visibility—

Dew point66°

Sun, 0167° / 48°

67 °

Derby, Sunday, 1 November

Overcast. High 67°, low 48°.

Pressure30.15 inHg

Wind6.3 mph NE

Humidity39%

Visibility—

Dew point38°

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.