Observed 8:00 AM MDT at KCUT

Keystone, SD weather

Overcast and 36°2°.

Forecasts differ

Now 36°2°

Cloudy

Wind: Calm; Up to 6 mph10 km/h through 8 PM
Dew point: 25°−4°; Dry · down to 15°−9° by 1 PM
UV index: 0Low; Moderate 12–3 PM · peak 3
Air quality: 26Good; Main pollutant: PM10 (dust)

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

13°7° cooler than this time yesterday (49°9° then, 36°2° now)

Good hours for

Below 40°4° tonight after 8 PM
Drizzle tomorrow noon–Monday 6 AM (90%, 0.54 in14 mm)
Fog tomorrow night 3–4 AM
Below freezing tomorrow night from 4 AM (low 31°−1°)
Snow Monday from 6 AM (60%, < 1 in< 3 cm)

This morningUp to 46°8° by 11 AM · Clear
This afternoonNear 46°8° · Clear
TonightDown to 35°2° by 5 AM · rain chance 10% · Mostly cloudy
Tomorrow morningUp to 38°3° by 10 AM · rain chance 30% · Cloudy
Tomorrow afternoonNear 38°3° · Rain all afternoon (70%)
Tomorrow nightNear 34°1° · Rain all night (90%) · freezing, low 32°0°

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 8a	Sunny	36°2° (likely 36°2° to 40°4°)	30°−1°	0%	7 mph11 km/h from NW, gusts 14 mph23 km/h	64%	5%	0
Sat 9a	Sunny	38°3° (likely 38°3° to 41°5°)	33°1°	0%	6 mph10 km/h from NW, gusts 16 mph26 km/h	59%	2%	0
Sat 10a	Sunny	43°6° (likely 41°5° to 44°7°)	39°4°	0%	5 mph8 km/h from NW, gusts 12 mph19 km/h	45%	6%	1
Sat 11a	Sunny	46°8° (likely 44°7° to 47°8°)	43°6°	0%	3 mph5 km/h from NW, gusts 9 mph15 km/h	36%	6%	2
Sat 12p	Sunny	47°8° (likely 47°8° to 49°9°)	45°7°	0%	3 mph5 km/h from N, gusts 9 mph15 km/h	30%	7%	3
Sat 1p	Sunny	48°9° (likely 48°9° to 51°11°)	46°8°	0%	5 mph8 km/h from N, gusts 8 mph12 km/h	26%	11%	3
Sat 2p	Sunny	50°10° (likely 48°9° to 52°11°)	48°9°	0%	6 mph10 km/h from NE, gusts 10 mph16 km/h	23%	18%	3
Sat 3p	Sunny	50°10° (likely 48°9° to 50°10°)	48°9°	0%	6 mph10 km/h from NE, gusts 10 mph16 km/h	22%	20%	2
Sat 4p	Sunny	49°9° (likely 46°8° to 49°9°)	47°8°	0%	5 mph8 km/h from NE, gusts 10 mph15 km/h	23%	27%	1
Sat 5p	Sunny	45°7° (likely 43°6° to 46°8°)	44°7°	0%	3 mph5 km/h from E, gusts 10 mph15 km/h	26%	38%	0
Sat 6p	Cloudy	42°6° (likely 39°4° to 44°7°)	42°6°	0%	2 mph3 km/h from NE, gusts 9 mph15 km/h	29%	79%	0
Sat 7p	Mostly cloudy	40°4° (likely 38°3° to 42°6°)	40°4°	0%	1 mph2 km/h from E, gusts 10 mph16 km/h	34%	49%	0
Sat 8p	Mostly cloudy	39°4° (likely 37°3° to 40°4°)	39°4°	0%	1 mph2 km/h from SE, gusts 9 mph15 km/h	35%	50%	0
Sat 9p	Cloudy	38°3° (likely 37°3° to 39°4°)	38°3°	0%	1 mph2 km/h from S, gusts 10 mph16 km/h	37%	78%	0
Sat 10p	Clear	38°3° (likely 36°2° to 38°3°)	38°3°	0%	1 mph2 km/h from S, gusts 8 mph13 km/h	37%	41%	0
Sat 11p	Clear	37°3° (likely 36°2° to 38°3°)	37°3°	0%	1 mph2 km/h from S, gusts 8 mph12 km/h	38%	41%	0
Sun 12a	Mostly cloudy	37°3° (likely 36°2° to 37°3°)	37°3°	10%	1 mph2 km/h from S, gusts 8 mph12 km/h	40%	65%	0
Sun 1a	Clear	36°2° (likely 35°2° to 38°3°)	36°2°	10%	1 mph2 km/h from S, gusts 8 mph12 km/h	42%	42%	0
Sun 2a	Cloudy	36°2° (likely 35°2° to 38°3°)	36°2°	10%	1 mph2 km/h from S, gusts 9 mph14 km/h	44%	56%	0
Sun 3a	Cloudy	36°2° (likely 35°2° to 38°3°)	36°2°	10%	1 mph2 km/h from S, gusts 10 mph16 km/h	45%	89%	0
Sun 4a	Cloudy	36°2° (likely 35°2° to 38°3°)	36°2°	10%	1 mph2 km/h from SE, gusts 9 mph14 km/h	47%	91%	0
Sun 5a	Cloudy	35°2° (likely 35°2° to 38°3°)	35°2°	10%	1 mph2 km/h from SE, gusts 10 mph16 km/h	52%	92%	0
Sun 6a	Cloudy	34°1° (likely 34°1° to 38°3°)	34°1°	30%	1 mph2 km/h from SE, gusts 11 mph17 km/h	56%	95%	0
Sun 7a	Cloudy	33°1° (likely 33°1° to 38°3°)	33°1°	30%	1 mph2 km/h from SE, gusts 10 mph17 km/h	61%	96%	0
Sun 8a	Cloudy	34°1° (likely 34°1° to 39°4°)	34°1°	30%	2 mph3 km/h from SE, gusts 10 mph17 km/h	64%	98%	0
Sun 9a	Cloudy	35°2° (likely 35°2° to 39°4°)	35°2°	30%	2 mph3 km/h from E, gusts 8 mph13 km/h	69%	99%	1
Sun 10a	Cloudy	38°3° (likely 34°1° to 40°4°)	36°2°	30%	3 mph5 km/h from E, gusts 8 mph12 km/h	73%	100%	0
Sun 11a	Cloudy	38°3° (likely 35°2° to 40°4°)	36°2°	30%	3 mph5 km/h from E, gusts 8 mph13 km/h	76%	100%	0
Sun 12p	Cloudy	38°3° (likely 35°2° to 40°4°)	36°2°	70%, 0.06 in1.5 mm	3 mph5 km/h from E, gusts 9 mph15 km/h	76%	100%	1
Sun 1p	Cloudy	38°3° (likely 34°1° to 39°4°)	36°2°	70%, 0.06 in1.5 mm	3 mph5 km/h from E, gusts 10 mph16 km/h	82%	100%	2
Sun 2p	Drizzle	39°4° (likely 33°1° to 39°4°)	37°3°	70%, 0.06 in1.5 mm	3 mph5 km/h from E, gusts 10 mph16 km/h	82%	100%	2
Sun 3p	Cloudy	39°4° (likely 33°1° to 39°4°)	36°2°	70%, 0.06 in1.5 mm	5 mph8 km/h from E, gusts 11 mph17 km/h	79%	100%	0
Sun 4p	Drizzle	39°4° (likely 33°1° to 39°4°)	36°2°	70%, 0.06 in1.5 mm	5 mph8 km/h from E, gusts 10 mph16 km/h	76%	100%	0
Sun 5p	Snow	37°3° (likely 33°1° to 37°3°)	34°1°	70%, 0.06 in1.5 mm	3 mph5 km/h from E, gusts 10 mph16 km/h	79%	100%	0
Sun 6p	Snow	35°2° (likely 33°1° to 36°2°)	32°0°	90%, 0.01 in0.3 mm	3 mph5 km/h from E, gusts 9 mph15 km/h	85%	100%	0
Sun 7p	Drizzle	35°2° (likely 33°1° to 35°2°)	32°0°	90%, 0.01 in0.3 mm	3 mph5 km/h from E, gusts 9 mph15 km/h	92%	100%	0
Sun 8p	Drizzle	35°2° (likely 33°1° to 35°2°)	32°0°	90%, 0.01 in0.3 mm	3 mph5 km/h from E, gusts 9 mph15 km/h	92%	100%	0
Sun 9p	Snow	35°2° (likely 32°0° to 35°2°)	32°0°	90%, 0.01 in0.3 mm	3 mph5 km/h from E, gusts 9 mph15 km/h	92%	100%	0
Sun 10p	Snow	35°2° (likely 32°0° to 35°2°)	35°2°	90%, 0.01 in0.3 mm	2 mph3 km/h from E, gusts 9 mph14 km/h	92%	100%	0
Sun 11p	Snow	34°1° (likely 32°0° to 34°1°)	34°1°	90%, 0.01 in0.3 mm	2 mph3 km/h from NE, gusts 8 mph13 km/h	92%	100%	0
Mon 12a	Drizzle	34°1° (likely 31°−1° to 34°1°)	34°1°	80%, 0.02 in0.5 mm	2 mph3 km/h from NE, gusts 8 mph12 km/h	92%	100%	0
Mon 1a	Snow	34°1° (likely 32°0° to 34°1°)	34°1°	80%, 0.02 in0.5 mm	2 mph3 km/h from NE, gusts 7 mph11 km/h	92%	100%	0
Mon 2a	Snow	33°1° (likely 31°−1° to 34°1°)	33°1°	80%, 0.02 in0.5 mm	2 mph3 km/h from NE, gusts 7 mph11 km/h	92%	99%	0
Mon 3a	Fog	33°1° (likely 31°−1° to 34°1°)	33°1°	80%, 0.02 in0.5 mm	2 mph3 km/h from NE, gusts 8 mph12 km/h	92%	99%	0
Mon 4a	Snow	32°0° (likely 31°−1° to 33°1°)	32°0°	80%, 0.02 in0.5 mm	1 mph2 km/h from NE, gusts 8 mph13 km/h	96%	99%	0
Mon 5a	Snow	32°0° (likely 31°−1° to 33°1°)	32°0°	80%, 0.02 in0.5 mm	1 mph2 km/h from NE, gusts 7 mph11 km/h	96%	100%	0
Mon 6a	Snow	31°−1° (likely 31°−1° to 34°1°)	31°−1°	60%, snow 0.1 in0.3 cm	1 mph2 km/h from NE, gusts 8 mph12 km/h	100%	99%	0
Mon 7a	Snow	32°0° (likely 30°−1° to 34°1°)	32°0°	60%, snow 0.1 in0.3 cm	1 mph2 km/h from NE, gusts 7 mph11 km/h	96%	100%	0

Days ahead

Shaded: typical range for these dates (1991–2020)

Today, Oct 24. Cloudy. High 51°11°, low 33°1°. Typical 52°11° / 31°−1°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 50°10°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 39°4°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 35°2°
  Dry
Official NWS forecast
Today: Mostly sunny. High near 51, with temperatures falling to around 45 in the afternoon. North wind 3 to 7 mph, with gusts as high as 17 mph.
Tonight: Mostly cloudy. Low around 33, with temperatures rising to around 35 overnight. Southeast wind around 2 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
51°11°–59°15°
Low, likely
33°1°–38°3°
Typical high / low
52°11° / 31°−1°
Wind
21 mph34 km/h, gusts 34 mph55 km/h
UV peak
4
Tomorrow, Oct 25. Snow. High 40°4°, low 31°−1°. Typical 52°11° / 30°−1°. Snow 0.1 in2.5 mm, 70% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 34°1°
  30% chance
2. Afternoon
  noon–6 PM
  Snow, 39°4°
  70% chance · 0.36 in9.1 mm
3. Evening
  6 PM–midnight
  Snow, 35°2°
  90% chance · 0.06 in1.5 mm
4. Overnight
  midnight–6 AM
  Snow, 32°0°
  80% chance · 0.12 in3 mm
Official NWS forecast
Day: A chance of snow before 9am, then a chance of rain and snow between 9am and noon, then rain and snow likely. Cloudy. High near 40, with temperatures falling to around 37 in the afternoon. East wind 1 to 5 mph, with gusts as high as 16 mph. Chance of precipitation is 70%.
Night: Rain and snow before 7pm, then rain and snow between 7pm and 11pm, then rain and snow. Cloudy, with a low around 31. Northeast wind around 3 mph. Chance of precipitation is 90%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
37°3°–40°4°
Low, likely
31°−1°–34°1°
Typical high / low
52°11° / 30°−1°
Wind
7 mph11 km/h, gusts 16 mph26 km/h
UV peak
2
Monday, Oct 26. Snow. High 38°3°, low 32°0°. Typical 52°11° / 30°−1°. Snow 0–5 in0–13 cm, 60% chance. Mostly agree.
1. Morning
  6 AM–noon
  Heavy snow, 32°0°
  80% chance · 1.3 in3.3 cm
2. Afternoon
  noon–6 PM
  Snow, 33°1°
  80% chance · 0.6 in1.6 cm
3. Evening
  6 PM–midnight
  Fog, 31°−1°
  40% chance
4. Overnight
  midnight–6 AM
  Mostly clear, 31°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Snow likely before 10am, then rain and snow likely between 10am and 5pm, then a chance of rain and snow. Cloudy. High near 38, with temperatures falling to around 36 in the afternoon. Northeast wind around 3 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Night: A slight chance of snow before 8pm, then a slight chance of rain between 8pm and 11pm, then a slight chance of snow between 11pm and midnight. Mostly cloudy, with a low around 32. Southeast wind around 2 mph. Chance of precipitation is 20%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
32°0°–38°3°
Low, likely
29°−2°–32°0°
Typical high / low
52°11° / 30°−1°
Wind
8 mph13 km/h, gusts 16 mph25 km/h
UV peak
1
Tuesday, Oct 27. Partly sunny. High 55°13°, low 37°3°. Typical 51°11° / 30°−1°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 55°13°
  Dry
3. Evening
  6 PM–midnight
  Clear, 40°5°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 55.
Night: Partly cloudy, with a low around 37.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
52°11°–58°14°
Low, likely
28°−2°–37°3°
Typical high / low
51°11° / 30°−1°
Wind
21 mph34 km/h, gusts 45 mph73 km/h
UV peak
4
Wednesday, Oct 28. Mostly sunny. High 56°13°, low 36°2°. Typical 51°11° / 29°−2°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 38°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  Dry
3. Evening
  6 PM–midnight
  Clear, 42°6°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 39°4°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 56.
Night: Partly cloudy, with a low around 36.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
54°12°–58°14°
Low, likely
31°−1°–36°2°
Typical high / low
51°11° / 29°−2°
Wind
11 mph17 km/h, gusts 39 mph63 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 58°14°, low 39°4°. Typical 51°11° / 29°−2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 43°6°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 60°15°
  Dry
3. Evening
  6 PM–midnight
  Clear, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 43°6°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 58.
Night: Partly cloudy, with a low around 39.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–65°18°
Low, likely
34°1°–40°4°
Typical high / low
51°11° / 29°−2°
Wind
11 mph17 km/h, gusts 30 mph49 km/h
UV peak
4
Friday, Oct 30. Cloudy. High 57°14°, low 39°4°. Typical 50°10° / 29°−2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 47°8°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 60°16°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 45°7°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 57.
Night: A chance of rain and snow. Partly cloudy, with a low around 39.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
55°13°–66°19°
Low, likely
39°4°–44°7°
Typical high / low
50°10° / 29°−2°
Wind
12 mph19 km/h, gusts 30 mph48 km/h
UV peak
3
Saturday, Oct 31. Cloudy. High 54°12°, low 39°4°. Typical 50°10° / 28°−2°. Rain 0.04 in1 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 58°14°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 45°7°
  Dry
4. Overnight
  midnight–6 AM
  Drizzle, 39°4°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
43°6°–60°16°
Low, likely
35°2°–44°7°
Typical high / low
50°10° / 28°−2°
Wind
16 mph25 km/h, gusts 30 mph47 km/h
UV peak
2
Sunday, Nov 1. Showers. High 48°9°, low 35°2°. Typical 50°10° / 28°−2°. Rain 0.15 in3.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 47°8°
  Dry
3. Evening
  6 PM–midnight
  Clear, 37°3°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 35°2°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
42°6°–58°14°
Low, likely
30°−1°–44°7°
Typical high / low
50°10° / 28°−2°
Wind
15 mph24 km/h, gusts 35 mph57 km/h
UV peak
3
Monday, Nov 2. Cloudy. High 50°10°, low 35°2°. Typical 50°10° / 28°−2°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 40°4°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 48°9°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 40°5°
  Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
43°6°–59°15°
Low, likely
30°−1°–39°4°
Typical high / low
50°10° / 28°−2°
Wind
11 mph17 km/h, gusts 18 mph29 km/h
UV peak
4

10 days15 days30 days

The outlook

Today
Dry, high 51°, low 33°.
Tomorrow
72% chance of snow, high 40°, low 31°, cooling off.
Monday
61% chance of snow, high 38°, low 32°.
Rest of week
Mostly dry, highs 48–58°.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (UNR) (opens in a new tab)

What changed since yesterday

No meaningful changes from yesterday’s forecast.

Radar

Radar data: NOAA MRMS, rendered by forecast.blue

Radar loads when scrolled into view

Full-screen radar

Rivers

NOAA river gauges within 25 mi

Battle Creek (SD) near Keystone

4.8 mi

Below flood stage

Level: 3.3 ft
Flow: under 1 cfs

Reading from Sat 6:15 AM · NWS gauge page

Spring Creek (SD) near Rockerville

7.0 mi

Below flood stage

Level: 3.3 ft

Reading from Sat 7 AM · NWS gauge page

Grace Coolidge Creek near Custer

9.8 mi

Below flood stage

Level: 6.7 ft
Flow: 1 cfs

Reading from Sat 6 AM · NWS gauge page

Rapid Creek above Canyon Lake near Rapid City

12 mi

Below flood stage

Level: 1.5 ft
Flow: 6 cfs

Reading from Sat 6:25 AM · NWS gauge page

For your home

What this week’s weather means for heating, cooling, pipes and fresh air.

Heating this week

About 69% less heating than a typical week.

This week 53Typical 172

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 43
h below 17°F: 0
h below 5°F: 0

47, 17 and 5°F are the test points heat pumps are rated at. About 16 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 25°F).

Open the windows?

No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.

Is this typical?

Custer · official normals 1991–2020 · records 1942–2026

Oct 24, today vs a typical year

Today’s expected high is about typical for the date.

Last 7 days vs normal

—SunOct 18
—MonOct 19
—TueOct 20
—WedOct 21
—ThuOct 22
—FriOct 23
—SatOct 24

Keystone weather by month: normals, records, snow and freeze dates

Sun & moon

Sun

Daylight: 10 h 36 min; Losing 2 min 53 s a day; shortest Dec 21, 1 h 42 min less
Golden hour: 5:15–6:13 PM; Morning 7:01–8:00 AM
Blue hour: 6:13–6:24 PM; Morning 6:50–7:01 AM; first light 6:50 AM

Stars tonight? Poor

Clouds most of the night (about 67% cover).

Moon

Waxing gibbous

97% lit · growing

Today: sets 5:34 AM · rises 4:55 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Keystone. The highest point on the skyline is about 7,100 ft, 5 mi away.Skyline from USGS elevation data, heights drawn up to 3.5× taller. Sky, sun and moon as they are now.

Keystone, SD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Battle Creek (SD) near Keystone

Spring Creek (SD) near Rockerville

Grace Coolidge Creek near Custer

Rapid Creek above Canyon Lake near Rapid City

For your home

Heating this week

Heat-pump hours, next 7 days

Comfort

Open the windows?

Is this typical?

Oct 24, today vs a typical year

Last 7 days vs normal

Sun & moon

Sun

Stars tonight? Poor

Moon