Monthly outlook for Northglenn, CO: average high 90.6°, average low 66.1°. That is 4.6° above the climate normal for August. Precipitation is expected on 8 days (about 3.1 inches), against a normal of 4 days and 0.8 inches. The warmest day looks like 12 August (100.4°), the coolest 16 August (61.9°).
90.6°/66.1°
Average high / low
+4.6°
Above normal
8 / 4
Wet days / normal
3.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
92°
82.4°
+5.4°
18 August – 27 August
88.2°
82.1°
+3.4°
28 August – 6 September
at normal
81°
—
August records over 66 years
99.9°5 August 2025All-time high
40.8°28 August 2004All-time low
Sun, 0994° / 66°0.01
94 °
Northglenn, Sunday, 9 August
Light rain. High 94°, low 66°.
Pressure29.77 inHg
Wind4.1 mph SE
Humidity9%
Visibility6.2 mi
Dew point29°
Mon, 1099° / 63°0.06
99 °
Northglenn, Monday, 10 August
Light rain. High 99°, low 63°.
Pressure29.80 inHg
Wind3.3 mph SE
Humidity15%
Visibility6.2 mi
Dew point39°
Tue, 1199° / 72°0
99 °
Northglenn, Tuesday, 11 August
Overcast. High 99°, low 72°.
Pressure29.80 inHg
Wind2.6 mph E
Humidity13%
Visibility6.2 mi
Dew point37°
Wed, 12100° / 72°0
100 °
Northglenn, Wednesday, 12 August
Light rain. High 100°, low 72°.
Pressure29.74 inHg
Wind4.4 mph NE
Humidity16%
Visibility6.2 mi
Dew point40°
Thu, 1388° / 63°0.78
88 °
Northglenn, Thursday, 13 August
Heavy rain. High 88°, low 63°.
Pressure29.77 inHg
Wind21.3 mph NW
Humidity35%
Visibility—
Dew point51°
Fri, 1481° / 65°0.34
81 °
Northglenn, Friday, 14 August
Rain. High 81°, low 65°.
Pressure29.97 inHg
Wind11.9 mph S
Humidity66%
Visibility—
Dew point58°
Sat, 1584° / 64°0.47
84 °
Northglenn, Saturday, 15 August
Rain. High 84°, low 64°.
Pressure30.09 inHg
Wind14.8 mph S
Humidity55%
Visibility—
Dew point57°
Sun, 1688° / 62°0.09
88 °
Northglenn, Sunday, 16 August
Light rain. High 88°, low 62°.
Pressure30.03 inHg
Wind9 mph SW
Humidity41%
Visibility—
Dew point52°
Mon, 1791° / 67°0.01
91 °
Northglenn, Monday, 17 August
Light rain. High 91°, low 67°.
Pressure29.97 inHg
Wind18.6 mph W
Humidity23%
Visibility—
Dew point42°
Tue, 1895° / 67°0
95 °
Northglenn, Tuesday, 18 August
Clear. High 95°, low 67°.
Pressure29.94 inHg
Wind11.3 mph SE
Humidity20%
Visibility—
Dew point41°
Wed, 1986° / 66°1.17
86 °
Northglenn, Wednesday, 19 August
Heavy rain. High 86°, low 66°.
Pressure30.00 inHg
Wind20.9 mph N
Humidity34%
Visibility—
Dew point47°
Thu, 2079° / 66°0.05
79 °
Northglenn, Thursday, 20 August
Light rain. High 79°, low 66°.
Pressure29.94 inHg
Wind6.1 mph SW
Humidity46%
Visibility—
Dew point53°
Fri, 2185° / 65°0.08
85 °
Northglenn, Friday, 21 August
Light rain. High 85°, low 65°.
Pressure29.74 inHg
Wind14.6 mph NW
Humidity30%
Visibility—
Dew point47°
Sat, 2291° / 66°0
91 °
Northglenn, Saturday, 22 August
Partly cloudy. High 91°, low 66°.
Pressure29.85 inHg
Wind12.5 mph S
Humidity19%
Visibility—
Dew point37°
Sun, 2392° / 67°0
92 °
Northglenn, Sunday, 23 August
Overcast. High 92°, low 67°.
Pressure29.83 inHg
Wind13.3 mph SE
Humidity22%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2482° / 56°0.06
82 °
Northglenn, Monday, 24 August
Climate normal for this date — 60-year average.
Average high82°
Average low56°
Average precipitation0.06 in
Chance of precipitation20%
Record high97° (2020)
Record low45° (1968)
Tue, 2582° / 56°0.04
82 °
Northglenn, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low56°
Average precipitation0.04 in
Chance of precipitation18%
Record high97° (2020)
Record low46° (1972)
Wed, 2682° / 56°0.05
82 °
Northglenn, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low56°
Average precipitation0.05 in
Chance of precipitation28%
Record high94° (2020)
Record low47° (1992)
Thu, 2781° / 56°0.04
81 °
Northglenn, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low56°
Average precipitation0.04 in
Chance of precipitation15%
Record high94° (2020)
Record low42° (1992)
Fri, 2881° / 55°0.02
81 °
Northglenn, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low55°
Average precipitation0.02 in
Chance of precipitation20%
Record high91° (2024)
Record low41° (2004)
Sat, 2982° / 55°0.02
82 °
Northglenn, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low55°
Average precipitation0.02 in
Chance of precipitation13%
Record high92° (2012)
Record low46° (2004)
Sun, 3082° / 55°0.05
82 °
Northglenn, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low55°
Average precipitation0.05 in
Chance of precipitation20%
Record high94° (2021)
Record low46° (1968)
Mon, 3181° / 55°0.03
81 °
Northglenn, Monday, 31 August
Climate normal for this date — 60-year average.
Average high81°
Average low55°
Average precipitation0.03 in
Chance of precipitation15%
Record high95° (2023)
Record low45° (1968)
Tue, 0181° / 54°0.06
81 °
Northglenn, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high81°
Average low54°
Average precipitation0.06 in
Chance of precipitation20%
Record high97° (2023)
Record low43° (1965)
Wed, 0281° / 54°0.04
81 °
Northglenn, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high81°
Average low54°
Average precipitation0.04 in
Chance of precipitation22%
Record high98° (2019)
Record low40° (1974)
Thu, 0381° / 54°0.03
81 °
Northglenn, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high81°
Average low54°
Average precipitation0.03 in
Chance of precipitation15%
Record high93° (2017)
Record low36° (1961)
Fri, 0481° / 53°0.03
81 °
Northglenn, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low53°
Average precipitation0.03 in
Chance of precipitation15%
Record high94° (2022)
Record low40° (1961)
Sat, 0581° / 54°0.02
81 °
Northglenn, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low54°
Average precipitation0.02 in
Chance of precipitation17%
Record high98° (2020)
Record low42° (1968)
Sun, 0680° / 53°0.03
80 °
Northglenn, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low53°
Average precipitation0.03 in
Chance of precipitation15%
Record high98° (2020)
Record low43° (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 Northglenn, 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 Northglenn, 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.