Monthly outlook for Bonesteel, SD: average high 87°, average low 62.4°. That is 1.5° above the climate normal for August. Precipitation is expected on 7 days (about 1.9 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 10 August (103°), the coolest 21 August (56.5°).
87°/62.4°
Average high / low
+1.5°
Above normal
7 / 4
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
89.4°
84.2°
+2.9°
19 August – 28 August
83.1°
84.5°
-0.8°
29 August – 7 September
at normal
82.2°
—
August records over 66 years
106.9°29 August 2012All-time high
47.8°23 August 1966All-time low
Climate normals and records are computed from the nearest reference point — Butte (12 mi).
Mon, 10103° / 65°0.02
103 °
Bonesteel, Monday, 10 August
Light rain. High 103°, low 65°.
Pressure29.77 inHg
Wind12.1 mph E
Humidity29%
Visibility6.2 mi
Dew point57°
Tue, 1197° / 65°0
97 °
Bonesteel, Tuesday, 11 August
Overcast. High 97°, low 65°.
Pressure29.80 inHg
Wind13.2 mph NE
Humidity40%
Visibility6.2 mi
Dew point60°
Wed, 1293° / 66°0.14
93 °
Bonesteel, Wednesday, 12 August
Rain. High 93°, low 66°.
Pressure29.88 inHg
Wind8.4 mph E
Humidity39%
Visibility6.2 mi
Dew point59°
Thu, 1375° / 62°0.65
75 °
Bonesteel, Thursday, 13 August
Rain. High 75°, low 62°.
Pressure30.00 inHg
Wind16 mph E
Humidity94%
Visibility—
Dew point61°
Fri, 1476° / 57°0
76 °
Bonesteel, Friday, 14 August
Overcast. High 76°, low 57°.
Pressure30.09 inHg
Wind16.2 mph SE
Humidity45%
Visibility—
Dew point51°
Sat, 1578° / 63°0.01
78 °
Bonesteel, Saturday, 15 August
Light rain. High 78°, low 63°.
Pressure30.12 inHg
Wind9.4 mph SE
Humidity72%
Visibility—
Dew point62°
Sun, 1682° / 64°0.11
82 °
Bonesteel, Sunday, 16 August
Light rain. High 82°, low 64°.
Pressure30.03 inHg
Wind11.4 mph S
Humidity58%
Visibility—
Dew point64°
Mon, 1795° / 66°0.06
95 °
Bonesteel, Monday, 17 August
Light rain. High 95°, low 66°.
Pressure29.94 inHg
Wind10.2 mph W
Humidity45%
Visibility—
Dew point61°
Tue, 1898° / 66°0.01
98 °
Bonesteel, Tuesday, 18 August
Light rain. High 98°, low 66°.
Pressure29.94 inHg
Wind11.1 mph W
Humidity32%
Visibility—
Dew point55°
Wed, 1981° / 59°0.27
81 °
Bonesteel, Wednesday, 19 August
Rain. High 81°, low 59°.
Pressure30.12 inHg
Wind15.7 mph NE
Humidity42%
Visibility—
Dew point49°
Thu, 2064° / 58°0.35
64 °
Bonesteel, Thursday, 20 August
Rain. High 64°, low 58°.
Pressure30.09 inHg
Wind13.6 mph SE
Humidity96%
Visibility—
Dew point57°
Fri, 2179° / 56°0.22
79 °
Bonesteel, Friday, 21 August
Rain. High 79°, low 56°.
Pressure29.85 inHg
Wind20.3 mph S
Humidity44%
Visibility—
Dew point52°
Sat, 2290° / 61°0
90 °
Bonesteel, Saturday, 22 August
Clear. High 90°, low 61°.
Pressure29.83 inHg
Wind12.6 mph N
Humidity32%
Visibility—
Dew point50°
Sun, 2386° / 62°0.03
86 °
Bonesteel, Sunday, 23 August
Light rain. High 86°, low 62°.
Pressure29.94 inHg
Wind8.1 mph SE
Humidity27%
Visibility—
Dew point41°
Mon, 2498° / 63°0
98 °
Bonesteel, Monday, 24 August
Clear. High 98°, low 63°.
Pressure29.71 inHg
Wind16.5 mph SW
Humidity28%
Visibility—
Dew point55°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2585° / 65°0.11
85 °
Bonesteel, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high85°
Average low65°
Average precipitation0.11 in
Chance of precipitation20%
Record high100° (1991)
Record low50° (1964)
Wed, 2685° / 65°0.07
85 °
Bonesteel, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high85°
Average low65°
Average precipitation0.07 in
Chance of precipitation30%
Record high101° (1970)
Record low51° (1992)
Thu, 2784° / 65°0.07
84 °
Bonesteel, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high98° (1962)
Record low49° (1992)
Fri, 2884° / 65°0.06
84 °
Bonesteel, Friday, 28 August
Climate normal for this date — 60-year average.
Average high84°
Average low65°
Average precipitation0.06 in
Chance of precipitation22%
Record high103° (2012)
Record low49° (1987)
Sat, 2984° / 64°0.06
84 °
Bonesteel, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high84°
Average low64°
Average precipitation0.06 in
Chance of precipitation22%
Record high107° (2012)
Record low51° (2018)
Sun, 3084° / 64°0.07
84 °
Bonesteel, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high84°
Average low64°
Average precipitation0.07 in
Chance of precipitation28%
Record high101° (2012)
Record low51° (1992)
Mon, 3183° / 64°0.09
83 °
Bonesteel, Monday, 31 August
Climate normal for this date — 60-year average.
Average high83°
Average low64°
Average precipitation0.09 in
Chance of precipitation25%
Record high97° (1975)
Record low49° (1965)
Tue, 0182° / 63°0.09
82 °
Bonesteel, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low63°
Average precipitation0.09 in
Chance of precipitation23%
Record high97° (1964)
Record low46° (1965)
Wed, 0283° / 63°0.06
83 °
Bonesteel, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high83°
Average low63°
Average precipitation0.06 in
Chance of precipitation23%
Record high103° (2023)
Record low46° (1972)
Thu, 0382° / 63°0.06
82 °
Bonesteel, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low63°
Average precipitation0.06 in
Chance of precipitation22%
Record high100° (2023)
Record low42° (1974)
Fri, 0482° / 62°0.11
82 °
Bonesteel, Friday, 4 September
Climate normal for this date — 60-year average.
Average high82°
Average low62°
Average precipitation0.11 in
Chance of precipitation27%
Record high100° (2023)
Record low45° (1962)
Sat, 0582° / 63°0.06
82 °
Bonesteel, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high82°
Average low63°
Average precipitation0.06 in
Chance of precipitation18%
Record high99° (1978)
Record low45° (1962)
Sun, 0682° / 62°0.04
82 °
Bonesteel, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high82°
Average low62°
Average precipitation0.04 in
Chance of precipitation13%
Record high99° (1970)
Record low42° (2025)
Mon, 0780° / 60°0.07
80 °
Bonesteel, Monday, 7 September
Climate normal for this date — 60-year average.
Average high80°
Average low60°
Average precipitation0.07 in
Chance of precipitation25%
Record high96° (1978)
Record low43° (2025)
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 Bonesteel, 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 Bonesteel, 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.