As of 16:13 MDT

Weather in Derby, CO

96°

Derby, Saturday, 8 August, 16:13

Overcast. Feels like 91°. High 97°, low 67°.

Pressure29.68 inHg

Wind6 mph S

Humidity14%

Visibility6.2 mi

Dew point37°

See detailed hourly forecast

Monthly outlook for Derby, CO: average high 93.5°, average low 69°. That is 5.6° above the climate normal for August. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 11 August (100.1°), the coolest 10 August (62.8°).

93.5°/69°

Average high / low

+5.6°

Above normal

4 / 4

Wet days / normal

2.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	94.8°	83.5°	+6.2°
18 August – 27 August	91.4°	83.2°	+4.5°
28 August – 6 September	at normal	82.1°	—

August records over 66 years

99.9°5 August 2025All-time high

42.1°28 August 2004All-time low

Climate normals and records are computed from the nearest reference point — Thornton (6 mi).

Sun, 0995° / 66°

95 °

Derby, Sunday, 9 August

Light rain. High 95°, low 66°.

Pressure29.74 inHg

Wind3.9 mph S

Humidity9%

Visibility6.2 mi

Dew point30°

Mon, 1099° / 63°

0.02

99 °

Derby, Monday, 10 August

Light rain. High 99°, low 63°.

Pressure29.80 inHg

Wind5 mph E

Humidity14%

Visibility6.2 mi

Dew point38°

Tue, 11100° / 74°

100 °

Derby, Tuesday, 11 August

Overcast. High 100°, low 74°.

Pressure29.77 inHg

Wind0.9 mph SE

Humidity12%

Visibility6.2 mi

Dew point37°

Wed, 12100° / 73°

0.02

100 °

Derby, Wednesday, 12 August

Light rain. High 100°, low 73°.

Pressure29.74 inHg

Wind3.3 mph SE

Humidity16%

Visibility6.2 mi

Dew point41°

Thu, 1389° / 68°

0.57

89 °

Derby, Thursday, 13 August

Heavy rain. High 89°, low 68°.

Pressure29.88 inHg

Wind11.3 mph S

Humidity39%

Visibility—

Dew point53°

Fri, 1489° / 68°

0.67

89 °

Derby, Friday, 14 August

Rain. High 89°, low 68°.

Pressure29.94 inHg

Wind13.7 mph W

Humidity38%

Visibility—

Dew point52°

Sat, 1590° / 66°

0.16

90 °

Derby, Saturday, 15 August

Rain. High 90°, low 66°.

Pressure29.97 inHg

Wind14.2 mph S

Humidity33%

Visibility—

Dew point50°

Sun, 1695° / 71°

0.02

95 °

Derby, Sunday, 16 August

Light rain. High 95°, low 71°.

Pressure29.97 inHg

Wind21.8 mph SW

Humidity22%

Visibility—

Dew point44°

Mon, 1793° / 72°

0.04

93 °

Derby, Monday, 17 August

Light rain. High 93°, low 72°.

Pressure29.97 inHg

Wind17.5 mph NW

Humidity24%

Visibility—

Dew point46°

Tue, 1892° / 70°

0.03

92 °

Derby, Tuesday, 18 August

Light rain. High 92°, low 70°.

Pressure29.97 inHg

Wind15.3 mph SW

Humidity26%

Visibility—

Dew point46°

Wed, 1993° / 72°

0.02

93 °

Derby, Wednesday, 19 August

Light rain. High 93°, low 72°.

Pressure29.85 inHg

Wind9 mph W

Humidity22%

Visibility—

Dew point45°

Thu, 2090° / 68°

0.63

90 °

Derby, Thursday, 20 August

Heavy rain. High 90°, low 68°.

Pressure29.97 inHg

Wind8.1 mph E

Humidity40%

Visibility—

Dew point54°

Fri, 2192° / 67°

92 °

Derby, Friday, 21 August

Clear. High 92°, low 67°.

Pressure29.91 inHg

Wind6.2 mph E

Humidity31%

Visibility—

Dew point49°

Sat, 2292° / 74°

0.02

92 °

Derby, Saturday, 22 August

Light rain. High 92°, low 74°.

Pressure29.88 inHg

Wind14.2 mph NE

Humidity23%

Visibility—

Dew point46°

Sun, 2389° / 66°

89 °

Derby, Sunday, 23 August

Light rain. High 89°, low 66°.

Pressure29.97 inHg

Wind11.8 mph NE

Humidity37%

Visibility—

Dew point52°

From day 17 onward the outlook is built from 60-year climate statistics

Mon, 2483° / 57°

0.06

83 °

Derby, Monday, 24 August

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0.06 in

Chance of precipitation20%

Record high97° (2020)

Record low47° (1968)

Tue, 2583° / 57°

0.04

83 °

Derby, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high83°

Average low57°

Average precipitation0.04 in

Chance of precipitation18%

Record high97° (2020)

Record low46° (1972)

Wed, 2683° / 58°

0.05

83 °

Derby, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0.05 in

Chance of precipitation28%

Record high94° (2020)

Record low48° (1992)

Thu, 2783° / 58°

0.04

83 °

Derby, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high83°

Average low58°

Average precipitation0.04 in

Chance of precipitation15%

Record high94° (2020)

Record low44° (1992)

Fri, 2882° / 57°

0.02

82 °

Derby, Friday, 28 August

Climate normal for this date — 60-year average.

Average high82°

Average low57°

Average precipitation0.02 in

Chance of precipitation20%

Record high91° (2024)

Record low42° (2004)

Sat, 2983° / 56°

0.02

83 °

Derby, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high83°

Average low56°

Average precipitation0.02 in

Chance of precipitation13%

Record high93° (2012)

Record low47° (2004)

Sun, 3083° / 56°

0.05

83 °

Derby, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high83°

Average low56°

Average precipitation0.05 in

Chance of precipitation20%

Record high94° (2021)

Record low47° (1968)

Mon, 3182° / 56°

0.03

82 °

Derby, Monday, 31 August

Climate normal for this date — 60-year average.

Average high82°

Average low56°

Average precipitation0.03 in

Chance of precipitation15%

Record high95° (2023)

Record low46° (1968)

Tue, 0182° / 55°

0.06

82 °

Derby, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high82°

Average low55°

Average precipitation0.06 in

Chance of precipitation20%

Record high97° (2023)

Record low45° (1965)

Wed, 0282° / 55°

0.04

82 °

Derby, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high82°

Average low55°

Average precipitation0.04 in

Chance of precipitation22%

Record high98° (2019)

Record low41° (1974)

Thu, 0382° / 55°

0.03

82 °

Derby, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high82°

Average low55°

Average precipitation0.03 in

Chance of precipitation15%

Record high93° (2017)

Record low38° (1961)

Fri, 0482° / 54°

0.03

82 °

Derby, Friday, 4 September

Climate normal for this date — 60-year average.

Average high82°

Average low54°

Average precipitation0.03 in

Chance of precipitation15%

Record high94° (2022)

Record low40° (1961)

Sat, 0582° / 55°

0.02

82 °

Derby, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high82°

Average low55°

Average precipitation0.02 in

Chance of precipitation17%

Record high98° (2020)

Record low42° (1968)

Sun, 0682° / 55°

0.03

82 °

Derby, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high82°

Average low55°

Average precipitation0.03 in

Chance of precipitation15%

Record high98° (2020)

Record low45° (1968)

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, CO 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, CO 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.