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As of 08:20 CDT

Weather in Derby, IL

57°Current weather

Derby, Saturday, 10 October, 08:20

Overcast. Feels like 56°. High 75°, low 55°.

Pressure30.06 inHg
Wind6.5 mph E
Humidity85%
Visibility6.2 mi
Dew point53°
Sun, 1182° / 51°0Clear
82 °Clear

Derby, Sunday, 11 October

Clear. High 82°, low 51°.

Pressure30.00 inHg
Wind6.3 mph NW
Humidity57%
Visibility6.2 mi
Dew point56°
Mon, 1287° / 58°0Clear
87 °Clear

Derby, Monday, 12 October

Clear. High 87°, low 58°.

Pressure30.00 inHg
Wind9.6 mph SW
Humidity44%
Visibility6.2 mi
Dew point60°
Tue, 1388° / 67°0Clear
88 °Clear

Derby, Tuesday, 13 October

Clear. High 88°, low 67°.

Pressure29.94 inHg
Wind10.1 mph SW
Humidity43%
Visibility6.2 mi
Dew point60°
Wed, 1478° / 70°0.31Rain
78 °Rain

Derby, Wednesday, 14 October

Rain. High 78°, low 70°.

Pressure30.03 inHg
Wind9.4 mph SW
Humidity96%
Visibility—
Dew point73°
Thu, 1579° / 67°0.22Rain
79 °Rain

Derby, Thursday, 15 October

Rain. High 79°, low 67°.

Pressure30.12 inHg
Wind9.1 mph E
Humidity74%
Visibility—
Dew point67°
Fri, 1669° / 50°0.57Rain
69 °Rain

Derby, Friday, 16 October

Rain. High 69°, low 50°.

Pressure30.03 inHg
Wind16.6 mph NW
Humidity46%
Visibility—
Dew point44°
Sat, 1746° / 37°0Overcast
46 °Overcast

Derby, Saturday, 17 October

Overcast. High 46°, low 37°.

Pressure30.33 inHg
Wind16.8 mph NW
Humidity42%
Visibility—
Dew point22°
Sun, 1852° / 31°0Clear
52 °Clear

Derby, Sunday, 18 October

Clear. High 52°, low 31°.

Pressure30.50 inHg
Wind6.9 mph NW
Humidity42%
Visibility—
Dew point26°
Mon, 1959° / 34°0Clear
59 °Clear

Derby, Monday, 19 October

Clear. High 59°, low 34°.

Pressure30.45 inHg
Wind6.4 mph S
Humidity31%
Visibility—
Dew point24°
Tue, 2065° / 40°0Partly cloudy
65 °Partly cloudy

Derby, Tuesday, 20 October

Partly cloudy. High 65°, low 40°.

Pressure30.33 inHg
Wind9.1 mph S
Humidity36%
Visibility—
Dew point34°
Wed, 2167° / 47°0.26Rain
67 °Rain

Derby, Wednesday, 21 October

Rain. High 67°, low 47°.

Pressure30.12 inHg
Wind14.7 mph S
Humidity48%
Visibility—
Dew point44°
Thu, 2267° / 47°0Clear
67 °Clear

Derby, Thursday, 22 October

Clear. High 67°, low 47°.

Pressure30.24 inHg
Wind4.7 mph NW
Humidity44%
Visibility—
Dew point41°
Fri, 2371° / 49°0Partly cloudy
71 °Partly cloudy

Derby, Friday, 23 October

Partly cloudy. High 71°, low 49°.

Pressure30.18 inHg
Wind5.5 mph N
Humidity38%
Visibility—
Dew point41°
Sat, 2471° / 48°0Clear
71 °Clear

Derby, Saturday, 24 October

Clear. High 71°, low 48°.

Pressure30.18 inHg
Wind4.4 mph E
Humidity32%
Visibility—
Dew point35°
Sun, 2570° / 53°0.04Light rain
70 °Light rain

Derby, Sunday, 25 October

Light rain. High 70°, low 53°.

Pressure29.88 inHg
Wind12.4 mph SW
Humidity42%
Visibility—
Dew point44°

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.