Monthly outlook for Gunbarrel, CO: average high 89.2°, average low 64°. That is 4.3° above the climate normal for August. Precipitation is expected on 9 days (about 2.3 inches), against a normal of 8 days and 1.5 inches. The warmest day looks like 12 August (98.2°), the coolest 16 August (59.9°).
89.2°/64°
Average high / low
+4.3°
Above normal
9 / 8
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
90.4°
81.5°
+4.9°
19 August – 28 August
87.2°
81.2°
+3.3°
29 August – 7 September
at normal
79.9°
—
August records over 66 years
97.9°7 August 2025All-time high
40.5°28 August 2004All-time low
Climate normals and records are computed from the nearest reference point — Boulder (5 mi).
Mon, 1095° / 61°0.12
95 °
Gunbarrel, Monday, 10 August
Rain. High 95°, low 61°.
Pressure29.80 inHg
Wind10.2 mph SE
Humidity17%
Visibility6.2 mi
Dew point41°
Tue, 1198° / 68°0
98 °
Gunbarrel, Tuesday, 11 August
Overcast. High 98°, low 68°.
Pressure29.80 inHg
Wind8.7 mph E
Humidity14%
Visibility6.2 mi
Dew point39°
Wed, 1298° / 68°0.02
98 °
Gunbarrel, Wednesday, 12 August
Light rain. High 98°, low 68°.
Pressure29.77 inHg
Wind4.8 mph E
Humidity18%
Visibility6.2 mi
Dew point41°
Thu, 1390° / 64°0.52
90 °
Gunbarrel, Thursday, 13 August
Rain. High 90°, low 64°.
Pressure29.80 inHg
Wind16.6 mph W
Humidity37%
Visibility—
Dew point51°
Fri, 1481° / 63°0.13
81 °
Gunbarrel, Friday, 14 August
Light rain. High 81°, low 63°.
Pressure30.00 inHg
Wind6.3 mph E
Humidity82%
Visibility—
Dew point60°
Sat, 1577° / 62°0.42
77 °
Gunbarrel, Saturday, 15 August
Rain. High 77°, low 62°.
Pressure30.12 inHg
Wind7.4 mph SW
Humidity60%
Visibility—
Dew point59°
Sun, 1685° / 60°0.05
85 °
Gunbarrel, Sunday, 16 August
Light rain. High 85°, low 60°.
Pressure30.03 inHg
Wind8.5 mph SW
Humidity45%
Visibility—
Dew point53°
Mon, 1790° / 64°0
90 °
Gunbarrel, Monday, 17 August
Light rain. High 90°, low 64°.
Pressure30.00 inHg
Wind10 mph W
Humidity25%
Visibility—
Dew point44°
Tue, 1895° / 65°0
95 °
Gunbarrel, Tuesday, 18 August
Clear. High 95°, low 65°.
Pressure29.94 inHg
Wind10 mph SE
Humidity21%
Visibility—
Dew point43°
Wed, 1981° / 63°0.78
81 °
Gunbarrel, Wednesday, 19 August
Heavy rain. High 81°, low 63°.
Pressure30.03 inHg
Wind14 mph NW
Humidity43%
Visibility—
Dew point51°
Thu, 2080° / 64°0.07
80 °
Gunbarrel, Thursday, 20 August
Light rain. High 80°, low 64°.
Pressure29.97 inHg
Wind10.8 mph NE
Humidity58%
Visibility—
Dew point57°
Fri, 2187° / 63°0.15
87 °
Gunbarrel, Friday, 21 August
Light rain. High 87°, low 63°.
Pressure29.74 inHg
Wind18.4 mph W
Humidity27%
Visibility—
Dew point46°
Sat, 2291° / 62°0
91 °
Gunbarrel, Saturday, 22 August
Partly cloudy. High 91°, low 62°.
Pressure29.83 inHg
Wind12.3 mph SE
Humidity20%
Visibility—
Dew point38°
Sun, 2392° / 63°0
92 °
Gunbarrel, Sunday, 23 August
Partly cloudy. High 92°, low 63°.
Pressure29.85 inHg
Wind8 mph SE
Humidity25%
Visibility—
Dew point44°
Mon, 2492° / 68°0
92 °
Gunbarrel, Monday, 24 August
Overcast. High 92°, low 68°.
Pressure29.85 inHg
Wind8.3 mph W
Humidity16%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2581° / 56°0.07
81 °
Gunbarrel, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low56°
Average precipitation0.07 in
Chance of precipitation50%
Record high94° (2019)
Record low47° (1972)
Wed, 2681° / 56°0.08
81 °
Gunbarrel, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low56°
Average precipitation0.08 in
Chance of precipitation48%
Record high91° (1994)
Record low48° (1992)
Thu, 2781° / 56°0.08
81 °
Gunbarrel, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low56°
Average precipitation0.08 in
Chance of precipitation42%
Record high92° (2012)
Record low43° (1992)
Fri, 2881° / 55°0.07
81 °
Gunbarrel, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low55°
Average precipitation0.07 in
Chance of precipitation57%
Record high90° (2013)
Record low40° (2004)
Sat, 2981° / 55°0.06
81 °
Gunbarrel, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low55°
Average precipitation0.06 in
Chance of precipitation40%
Record high93° (2012)
Record low46° (2004)
Sun, 3081° / 55°0.08
81 °
Gunbarrel, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high81°
Average low55°
Average precipitation0.08 in
Chance of precipitation40%
Record high91° (2005)
Record low44° (1964)
Mon, 3180° / 55°0.07
80 °
Gunbarrel, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low55°
Average precipitation0.07 in
Chance of precipitation42%
Record high93° (2011)
Record low44° (1968)
Tue, 0180° / 54°0.08
80 °
Gunbarrel, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low54°
Average precipitation0.08 in
Chance of precipitation37%
Record high94° (2019)
Record low42° (1965)
Wed, 0280° / 53°0.06
80 °
Gunbarrel, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low53°
Average precipitation0.06 in
Chance of precipitation38%
Record high95° (2019)
Record low41° (1974)
Thu, 0380° / 53°0.05
80 °
Gunbarrel, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low53°
Average precipitation0.05 in
Chance of precipitation30%
Record high92° (2017)
Record low37° (1961)
Fri, 0480° / 53°0.05
80 °
Gunbarrel, Friday, 4 September
Climate normal for this date — 60-year average.
Average high80°
Average low53°
Average precipitation0.05 in
Chance of precipitation33%
Record high92° (1960)
Record low41° (1961)
Sat, 0580° / 53°0.05
80 °
Gunbarrel, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low53°
Average precipitation0.05 in
Chance of precipitation25%
Record high94° (2020)
Record low44° (1962)
Sun, 0679° / 53°0.06
79 °
Gunbarrel, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low53°
Average precipitation0.06 in
Chance of precipitation40%
Record high95° (2020)
Record low43° (1968)
Mon, 0778° / 53°0.07
78 °
Gunbarrel, Monday, 7 September
Climate normal for this date — 60-year average.
Average high78°
Average low53°
Average precipitation0.07 in
Chance of precipitation33%
Record high93° (2022)
Record low43° (2010)
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 Gunbarrel, 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 Gunbarrel, 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.