Monthly outlook for Benchmark, SD: average high 81.4°, average low 59.4°. That is 0.5° above the climate normal for August. Precipitation is expected on 5 days (about 1.6 inches), against a normal of 5 days and 1.0 inches. The warmest day looks like 10 August (89.5°), the coolest 11 August (53.7°).
81.4°/59.4°
Average high / low
+0.5°
Above normal
5 / 5
Wet days / normal
1.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
78.7°
80.2°
-0.8°
19 August – 28 August
85.8°
80.3°
+3°
29 August – 7 September
at normal
78.1°
—
August records over 66 years
100.4°29 August 2012All-time high
38.3°22 August 1966All-time low
Climate normals and records are computed from the nearest reference point — Blackhawk (13 mi).
Mon, 1089° / 57°0
89 °
Benchmark, Monday, 10 August
Mostly clear. High 89°, low 57°.
Pressure29.74 inHg
Wind8.6 mph SE
Humidity20%
Visibility6.2 mi
Dew point43°
Tue, 1188° / 54°0
88 °
Benchmark, Tuesday, 11 August
Clear. High 88°, low 54°.
Pressure29.80 inHg
Wind11.8 mph SE
Humidity30%
Visibility6.2 mi
Dew point50°
Wed, 1287° / 60°0
87 °
Benchmark, Wednesday, 12 August
Partly cloudy. High 87°, low 60°.
Pressure29.77 inHg
Wind15.7 mph SE
Humidity22%
Visibility6.2 mi
Dew point44°
Thu, 1368° / 60°0.09
68 °
Benchmark, Thursday, 13 August
Light rain. High 68°, low 60°.
Pressure29.91 inHg
Wind9.7 mph SE
Humidity78%
Visibility6.2 mi
Dew point60°
Fri, 1470° / 59°0.57
70 °
Benchmark, Friday, 14 August
Rain. High 70°, low 59°.
Pressure29.97 inHg
Wind6 mph SE
Humidity96%
Visibility—
Dew point59°
Sat, 1567° / 57°0.26
67 °
Benchmark, Saturday, 15 August
Light rain. High 67°, low 57°.
Pressure30.06 inHg
Wind4.6 mph E
Humidity85%
Visibility—
Dew point59°
Sun, 1675° / 55°0.55
75 °
Benchmark, Sunday, 16 August
Rain. High 75°, low 55°.
Pressure29.97 inHg
Wind16.4 mph SW
Humidity58%
Visibility—
Dew point54°
Mon, 1778° / 59°0.02
78 °
Benchmark, Monday, 17 August
Light rain. High 78°, low 59°.
Pressure29.85 inHg
Wind14.4 mph NW
Humidity30%
Visibility—
Dew point40°
Tue, 1882° / 58°0
82 °
Benchmark, Tuesday, 18 August
Clear. High 82°, low 58°.
Pressure29.94 inHg
Wind10.3 mph SE
Humidity25%
Visibility—
Dew point38°
Wed, 1988° / 62°0
88 °
Benchmark, Wednesday, 19 August
Mostly clear. High 88°, low 62°.
Pressure29.85 inHg
Wind10.3 mph W
Humidity18%
Visibility—
Dew point37°
Thu, 2088° / 64°0.01
88 °
Benchmark, Thursday, 20 August
Light rain. High 88°, low 64°.
Pressure29.91 inHg
Wind9.2 mph E
Humidity19%
Visibility—
Dew point38°
Fri, 2186° / 62°0
86 °
Benchmark, Friday, 21 August
Mostly clear. High 86°, low 62°.
Pressure29.94 inHg
Wind9.8 mph NE
Humidity25%
Visibility—
Dew point43°
Sat, 2288° / 67°0
88 °
Benchmark, Saturday, 22 August
Clear. High 88°, low 67°.
Pressure29.94 inHg
Wind12 mph N
Humidity22%
Visibility—
Dew point41°
Sun, 2381° / 62°0
81 °
Benchmark, Sunday, 23 August
Overcast. High 81°, low 62°.
Pressure30.06 inHg
Wind10.7 mph NE
Humidity37%
Visibility—
Dew point48°
Mon, 2483° / 57°0.07
83 °
Benchmark, Monday, 24 August
Light rain. High 83°, low 57°.
Pressure30.00 inHg
Wind13 mph SE
Humidity46%
Visibility—
Dew point52°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 59°0.03
80 °
Benchmark, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low59°
Average precipitation0.03 in
Chance of precipitation22%
Record high94° (2020)
Record low42° (1964)
Wed, 2680° / 58°0.09
80 °
Benchmark, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low58°
Average precipitation0.09 in
Chance of precipitation30%
Record high98° (1970)
Record low46° (1992)
Thu, 2780° / 58°0.07
80 °
Benchmark, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high80°
Average low58°
Average precipitation0.07 in
Chance of precipitation22%
Record high98° (2010)
Record low45° (1987)
Fri, 2879° / 59°0.04
79 °
Benchmark, Friday, 28 August
Climate normal for this date — 60-year average.
Average high79°
Average low59°
Average precipitation0.04 in
Chance of precipitation15%
Record high93° (1969)
Record low44° (1988)
Sat, 2980° / 58°0.06
80 °
Benchmark, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low58°
Average precipitation0.06 in
Chance of precipitation22%
Record high100° (2012)
Record low46° (1988)
Sun, 3080° / 58°0.05
80 °
Benchmark, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low58°
Average precipitation0.05 in
Chance of precipitation25%
Record high95° (2023)
Record low43° (1992)
Mon, 3178° / 57°0.04
78 °
Benchmark, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low57°
Average precipitation0.04 in
Chance of precipitation17%
Record high94° (2008)
Record low42° (1962)
Tue, 0178° / 57°0.06
78 °
Benchmark, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low57°
Average precipitation0.06 in
Chance of precipitation22%
Record high95° (2012)
Record low43° (1974)
Wed, 0279° / 58°0.07
79 °
Benchmark, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low58°
Average precipitation0.07 in
Chance of precipitation18%
Record high96° (1960)
Record low40° (1974)
Thu, 0378° / 56°0.02
78 °
Benchmark, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high78°
Average low56°
Average precipitation0.02 in
Chance of precipitation20%
Record high95° (2024)
Record low38° (1974)
Fri, 0478° / 56°0.07
78 °
Benchmark, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low56°
Average precipitation0.07 in
Chance of precipitation28%
Record high97° (1960)
Record low40° (1962)
Sat, 0578° / 56°0.06
78 °
Benchmark, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low56°
Average precipitation0.06 in
Chance of precipitation18%
Record high99° (2020)
Record low37° (1965)
Sun, 0677° / 55°0.04
77 °
Benchmark, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low55°
Average precipitation0.04 in
Chance of precipitation23%
Record high97° (1978)
Record low40° (2025)
Mon, 0776° / 55°0.04
76 °
Benchmark, Monday, 7 September
Climate normal for this date — 60-year average.
Average high76°
Average low55°
Average precipitation0.04 in
Chance of precipitation18%
Record high97° (2022)
Record low38° (1986)
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 Benchmark, SD 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 Benchmark, SD 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.