Monthly outlook for Marshall, CO: average high 88.3°, average low 64.4°. That is 3.8° above the climate normal for August. Precipitation is expected on 9 days (about 2.3 inches), against a normal of 8 days and 1.4 inches. The warmest day looks like 11 August (96°), the coolest 10 August (60.4°).
88.3°/64.4°
Average high / low
+3.8°
Above normal
9 / 8
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
89.2°
81.5°
+4.3°
18 August – 27 August
86.8°
81.3°
+3.1°
28 August – 6 September
at normal
80.2°
—
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).
Sun, 0993° / 64°0.06
93 °
Marshall, Sunday, 9 August
Light rain. High 93°, low 64°.
Pressure29.80 inHg
Wind3.2 mph W
Humidity11%
Visibility6.2 mi
Dew point32°
Mon, 1094° / 60°0.02
94 °
Marshall, Monday, 10 August
Light rain. High 94°, low 60°.
Pressure29.83 inHg
Wind12.8 mph E
Humidity17%
Visibility6.2 mi
Dew point39°
Tue, 1196° / 69°0.04
96 °
Marshall, Tuesday, 11 August
Light rain. High 96°, low 69°.
Pressure29.80 inHg
Wind13.6 mph E
Humidity14%
Visibility6.2 mi
Dew point36°
Wed, 1294° / 66°0
94 °
Marshall, Wednesday, 12 August
Overcast. High 94°, low 66°.
Pressure29.77 inHg
Wind7.5 mph E
Humidity18%
Visibility6.2 mi
Dew point40°
Thu, 1384° / 62°0.29
84 °
Marshall, Thursday, 13 August
Rain. High 84°, low 62°.
Pressure29.94 inHg
Wind8.7 mph NE
Humidity42%
Visibility—
Dew point51°
Fri, 1477° / 62°0.74
77 °
Marshall, Friday, 14 August
Heavy rain. High 77°, low 62°.
Pressure29.97 inHg
Wind13.7 mph SW
Humidity49%
Visibility—
Dew point55°
Sat, 1583° / 64°0.07
83 °
Marshall, Saturday, 15 August
Light rain. High 83°, low 64°.
Pressure30.00 inHg
Wind9 mph W
Humidity36%
Visibility—
Dew point51°
Sun, 1691° / 67°0.01
91 °
Marshall, Sunday, 16 August
Light rain. High 91°, low 67°.
Pressure30.00 inHg
Wind15.2 mph S
Humidity24%
Visibility—
Dew point45°
Mon, 1786° / 67°0.12
86 °
Marshall, Monday, 17 August
Light rain. High 86°, low 67°.
Pressure30.03 inHg
Wind15.9 mph SW
Humidity27%
Visibility—
Dew point46°
Tue, 1889° / 65°0.02
89 °
Marshall, Tuesday, 18 August
Light rain. High 89°, low 65°.
Pressure30.03 inHg
Wind9.5 mph SW
Humidity28%
Visibility—
Dew point45°
Wed, 1990° / 64°0.52
90 °
Marshall, Wednesday, 19 August
Rain. High 90°, low 64°.
Pressure29.91 inHg
Wind11.4 mph W
Humidity26%
Visibility—
Dew point45°
Thu, 2083° / 64°0.31
83 °
Marshall, Thursday, 20 August
Rain. High 83°, low 64°.
Pressure30.00 inHg
Wind6.7 mph W
Humidity48%
Visibility—
Dew point54°
Fri, 2188° / 62°0.01
88 °
Marshall, Friday, 21 August
Light rain. High 88°, low 62°.
Pressure29.94 inHg
Wind9.5 mph W
Humidity35%
Visibility—
Dew point49°
Sat, 2285° / 68°0.03
85 °
Marshall, Saturday, 22 August
Light rain. High 85°, low 68°.
Pressure29.94 inHg
Wind9.9 mph NE
Humidity29%
Visibility—
Dew point47°
Sun, 2386° / 60°0.04
86 °
Marshall, Sunday, 23 August
Light rain. High 86°, low 60°.
Pressure30.00 inHg
Wind12.4 mph NE
Humidity41%
Visibility—
Dew point51°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 56°0.09
81 °
Marshall, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low56°
Average precipitation0.09 in
Chance of precipitation37%
Record high93° (2020)
Record low44° (1968)
Tue, 2581° / 56°0.07
81 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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 °
Marshall, 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)
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 Marshall, 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 Marshall, 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.