Observed 7:55 PM CDT at KCNB

Altamont, SD weather

Clear and 49°9°, rain tomorrow ~1–7 PM (99%).

Forecasts agree

Now 49°9°

Clear

Wind: Calm; Up to 7 mph11 km/h through 8 AM
Dew point: 43°6°; Comfortable · down to 34°1° by 11 PM (dry)
UV tomorrow: 1Low; Low all day (peak 1)
Air quality: 27Good; Main pollutant: PM10 (dust)
Pressure: 30.35 inHg1028 hPa; Rising slowly · +0.04 inHg+1.3 hPa in 3 h

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

19°11° cooler than this time yesterday (68°20° then, 49°9° now)

Good hours for

Dry until 1 PM tomorrow
Low 38°3° tomorrow at 7 AM
High 46°8° tomorrow at 11 AM
Rain tomorrow from 1 PM (100%, 5.5 in139 mm)
Gusts to 30 mph48 km/h Monday from 1 PM

TonightDown to 40°4° by 5 AM · Mostly cloudy
Tomorrow morningUp to 46°8° by 11 AM · rain chance 30% · Cloudy
Tomorrow afternoonNear 46°8° · Rain 1–6 PM (70%)
Tomorrow nightDown to 37°3° by 5 AM · Rain all night (90%)
Monday morningUp to 40°4° by 10 AM · Rain all morning (100%)
Monday afternoonNear 42°6° · Rain all afternoon (100%) · gusts to 30 mph48 km/h

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 8p	Cloudy	45°7° (likely 45°7° to 47°8°)	41°5°	5%	7 mph11 km/h from NNW, gusts 8 mph13 km/h	76%	81%	0
Sat 9p	Cloudy	45°7° (likely 44°7° to 46°8°)	41°5°	5%	7 mph11 km/h from NNW, gusts 9 mph14 km/h	73%	82%	0
Sat 10p	Cloudy	44°7° (likely 42°6° to 46°8°)	40°4°	5%	7 mph11 km/h from N, gusts 7 mph11 km/h	73%	80%	0
Sat 11p	Cloudy	43°6° (likely 42°6° to 45°7°)	39°4°	0%	7 mph11 km/h from NNW, gusts 8 mph12 km/h	70%	85%	0
Sun 12a	Cloudy	43°6° (likely 41°5° to 45°7°)	39°4°	0%	6 mph10 km/h from N, gusts 8 mph12 km/h	63%	90%	0
Sun 1a	Cloudy	44°7° (likely 42°6° to 45°7°)	41°5°	0%	5 mph8 km/h from N, gusts 8 mph13 km/h	53%	85%	0
Sun 2a	Mostly cloudy	43°6° (likely 40°4° to 44°7°)	40°4°	0%	5 mph8 km/h from N, gusts 8 mph13 km/h	53%	54%	0
Sun 3a	Clear	43°6° (likely 39°4° to 44°7°)	39°4°	0%	6 mph10 km/h from N, gusts 7 mph12 km/h	53%	40%	0
Sun 4a	Mostly cloudy	42°6° (likely 38°3° to 43°6°)	38°3°	0%	6 mph10 km/h from N, gusts 9 mph14 km/h	53%	51%	0
Sun 5a	Cloudy	40°4° (likely 37°3° to 43°6°)	36°2°	5%	6 mph10 km/h from NNE, gusts 8 mph13 km/h	59%	80%	0
Sun 6a	Cloudy	39°4° (likely 37°3° to 42°6°)	35°2°	5%	6 mph10 km/h from NNE, gusts 7 mph12 km/h	62%	81%	0
Sun 7a	Cloudy	38°3° (likely 36°2° to 42°6°)	34°1°	10%	6 mph10 km/h from NNE, gusts 8 mph12 km/h	64%	93%	0
Sun 8a	Cloudy	40°4° (likely 37°3° to 42°6°)	36°2°	20%	6 mph10 km/h from NE, gusts 8 mph13 km/h	59%	97%	0
Sun 9a	Cloudy	42°6° (likely 39°4° to 43°6°)	38°3°	20%	7 mph11 km/h from NE, gusts 11 mph17 km/h	60%	99%	0
Sun 10a	Cloudy	44°7° (likely 41°5° to 44°7°)	40°4°	30%	7 mph11 km/h from NE, gusts 13 mph20 km/h	58%	100%	1
Sun 11a	Cloudy	46°8° (likely 41°5° to 46°8°)	42°6°	30%	7 mph11 km/h from NE, gusts 12 mph20 km/h	53%	99%	1
Sun 12p	Cloudy	46°8° (likely 42°6° to 46°8°)	42°6°	40%	8 mph13 km/h from NE, gusts 12 mph19 km/h	56%	100%	0
Sun 1p	Cloudy	46°8° (likely 43°6° to 46°8°)	42°6°	70%, 0.04 in1 mm	8 mph13 km/h from NE, gusts 12 mph19 km/h	56%	100%	0
Sun 2p	Rain	46°8° (likely 42°6° to 46°8°)	42°6°	60%, 0.04 in1 mm	8 mph13 km/h from NE, gusts 10 mph15 km/h	56%	100%	0
Sun 3p	Rain	46°8° (likely 42°6° to 46°8°)	41°5°	40%, 0.04 in1 mm	9 mph14 km/h from NE, gusts 13 mph21 km/h	56%	100%	1
Sun 4p	Rain	46°8° (likely 42°6° to 46°8°)	41°5°	50%, 0.04 in1 mm	9 mph14 km/h from NE, gusts 17 mph27 km/h	56%	100%	0
Sun 5p	Rain	46°8° (likely 40°4° to 46°8°)	41°5°	50%, 0.04 in1 mm	9 mph14 km/h from NE, gusts 17 mph28 km/h	58%	100%	0
Sun 6p	Rain	45°7° (likely 40°4° to 45°7°)	40°4°	50%, 0.04 in1 mm	9 mph14 km/h from NE, gusts 15 mph23 km/h	63%	100%	0
Sun 7p	Rain	42°6° (likely 40°4° to 42°6°)	36°2°	40%, 0.05 in1.3 mm	9 mph14 km/h from NE, gusts 12 mph19 km/h	70%	100%	0
Sun 8p	Rain	40°4° (likely 39°4° to 42°6°)	34°1°	50%, 0.05 in1.3 mm	9 mph14 km/h from NE, gusts 14 mph23 km/h	76%	100%	0
Sun 9p	Rain	40°4° (likely 39°4° to 42°6°)	34°1°	60%, 0.05 in1.3 mm	9 mph14 km/h from NE, gusts 16 mph26 km/h	76%	99%	0
Sun 10p	Rain	40°4° (likely 39°4° to 42°6°)	33°1°	60%, 0.05 in1.3 mm	10 mph16 km/h from NE, gusts 17 mph28 km/h	76%	100%	0
Sun 11p	Drizzle	40°4° (likely 39°4° to 41°5°)	33°1°	60%, 0.05 in1.3 mm	10 mph16 km/h from NE, gusts 15 mph24 km/h	79%	100%	0
Mon 12a	Rain	40°4° (likely 38°3° to 41°5°)	33°1°	70%, 0.05 in1.3 mm	10 mph16 km/h from NE, gusts 18 mph29 km/h	79%	100%	0
Mon 1a	Rain	40°4° (likely 38°3° to 41°5°)	33°1°	80%, 0.12 in3 mm	10 mph16 km/h from NE, gusts 19 mph30 km/h	82%	100%	0
Mon 2a	Rain	39°4° (likely 38°3° to 41°5°)	32°0°	70%, 0.12 in3 mm	12 mph19 km/h from NE, gusts 20 mph32 km/h	85%	100%	0
Mon 3a	Drizzle	39°4° (likely 38°3° to 41°5°)	32°0°	70%, 0.12 in3 mm	12 mph19 km/h from NE, gusts 20 mph32 km/h	85%	100%	0
Mon 4a	Rain	39°4° (likely 38°3° to 41°5°)	31°−1°	90%, 0.12 in3 mm	13 mph21 km/h from ENE, gusts 21 mph33 km/h	85%	100%	0
Mon 5a	Rain	37°3° (likely 37°3° to 40°4°)	29°−2°	90%, 0.12 in3 mm	13 mph21 km/h from ENE, gusts 21 mph33 km/h	92%	100%	0
Mon 6a	Rain	36°2° (likely 36°2° to 40°4°)	27°−3°	90%, 0.12 in3 mm	14 mph23 km/h from ENE, gusts 21 mph35 km/h	96%	100%	0
Mon 7a	Drizzle	37°3° (likely 37°3° to 40°4°)	28°−2°	100%, 0.33 in8.4 mm	15 mph24 km/h from ENE, gusts 20 mph32 km/h	92%	100%	0
Mon 8a	Rain	38°3° (likely 36°2° to 39°4°)	29°−2°	100%, 0.33 in8.4 mm	15 mph24 km/h from ENE, gusts 21 mph33 km/h	85%	100%	0
Mon 9a	Rain	39°4° (likely 36°2° to 39°4°)	31°−1°	100%, 0.33 in8.4 mm	15 mph24 km/h from ENE, gusts 24 mph38 km/h	85%	100%	0
Mon 10a	Rain	40°4° (likely 36°2° to 40°4°)	32°0°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 25 mph40 km/h	89%	100%	0
Mon 11a	Rain	40°4° (likely 36°2° to 40°4°)	32°0°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 25 mph40 km/h	92%	100%	0
Mon 12p	Rain	41°5° (likely 36°2° to 41°5°)	33°1°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 23 mph37 km/h	89%	100%	0
Mon 1p	Rain	42°6° (likely 36°2° to 42°6°)	34°1°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 25 mph40 km/h	86%	100%	0
Mon 2p	Rain	42°6° (likely 36°2° to 42°6°)	34°1°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 26 mph42 km/h	86%	100%	0
Mon 3p	Rain	43°6° (likely 36°2° to 43°6°)	35°2°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 27 mph43 km/h	82%	100%	0
Mon 4p	Rain	42°6° (likely 36°2° to 42°6°)	34°1°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 28 mph46 km/h	86%	100%	0
Mon 5p	Rain	42°6° (likely 36°2° to 42°6°)	34°1°	100%, 0.33 in8.4 mm	16 mph26 km/h from ENE, gusts 30 mph48 km/h	86%	100%	0
Mon 6p	Rain	40°4° (likely 36°2° to 40°4°)	32°0°	100%, 0.33 in8.4 mm	15 mph24 km/h from ENE, gusts 30 mph49 km/h	92%	100%	0
Mon 7p	Rain	38°3° (likely 36°2° to 40°4°)	29°−2°	100%, 0.25 in6.4 mm	15 mph24 km/h from ENE, gusts 30 mph48 km/h	100%	100%	0

Days ahead

Tap a day for its hours and the official wording.

Today, Oct 24. Drizzle. High 65°18°, low 37°3°. Rain 0.19 in4.8 mm, 70% chance. Forecasts agree.
1. Evening
  6 PM–midnight
  Cloudy, 45°7°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 40°4°
  Dry
Official NWS forecast
Tonight: Mostly cloudy. Low around 37, with temperatures rising to around 40 overnight. North wind around 7 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
65°18°–66°19°
Low, likely
37°3°–44°7°
Wind
25 mph40 km/h, gusts 50 mph81 km/h
UV peak
2
Tomorrow, Oct 25. Rain. High 46°8°, low 34°1°. Rain 0.22 in5.6 mm, 70% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 40°4°
  30% chance
2. Afternoon
  noon–6 PM
  Rain, 46°8°
  70% chance · 0.2 in5.1 mm
3. Evening
  6 PM–midnight
  Rain, 40°4°
  60% chance · 0.29 in7.4 mm
4. Overnight
  midnight–6 AM
  Rain, 37°3°
  90% chance · 0.65 in17 mm
Official NWS forecast
Day: Rain likely after 8am. Cloudy, with a high near 46. Northeast wind 6 to 9 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
Night: Rain. Cloudy. Low around 34, with temperatures rising to around 37 overnight. Northeast wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
43°6°–46°8°
Low, likely
34°1°–41°5°
Wind
12 mph19 km/h, gusts 22 mph36 km/h
Monday, Oct 26. Rain. High 43°6°, low 36°2°. Rain 0.97 in25 mm, 100% chance. Forecasts agree.
1. Morning
  6 AM–noon
  Rain, 38°3°
  100% chance · 1.8 in45 mm
2. Afternoon
  noon–6 PM
  Rain, 43°6°
  100% chance · 2 in50 mm
3. Evening
  6 PM–midnight
  Rain, 38°3°
  100% chance · 0.83 in21 mm
4. Overnight
  midnight–6 AM
  Drizzle, 40°4°
  90% chance · 0.08 in2.1 mm
Official NWS forecast
Day: Rain. Cloudy, with a high near 43. East northeast wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Night: Rain. Cloudy, with a low around 36. East wind 12 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
39°4°–43°6°
Low, likely
36°2°–39°4°
Wind
21 mph34 km/h, gusts 38 mph61 km/h
Tuesday, Oct 27. Rain. High 54°12°, low 43°6°. Rain 0.12 in3 mm, 70% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 44°7°
  60% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Sunny, 53°12°
  Dry
3. Evening
  6 PM–midnight
  Clear, 51°11°
  40% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Clear, 46°8°
  30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely before 7am. Partly sunny, with a high near 54. South southwest wind around 12 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Night: A slight chance of rain between 7pm and 1am. Mostly cloudy, with a low around 43. South wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
52°11°–57°14°
Low, likely
39°4°–43°6°
Wind
21 mph34 km/h, gusts 38 mph62 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 60°16°, low 41°5°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 44°7°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 59°15°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 51°11°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 40°5°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 60. West southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Night: Mostly clear, with a low around 41. West wind 5 to 8 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
53°12°–64°18°
Low, likely
41°5°–47°8°
Wind
19 mph30 km/h, gusts 39 mph63 km/h
UV peak
3
Thursday, Oct 29. Partly sunny. High 61°16°, low 45°7°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 39°4°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 48°9°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 50°10°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 61.
Night: A slight chance of rain after 1am. Partly cloudy, with a low around 45. Chance of precipitation is 20%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–61°16°
Low, likely
37°3°–45°7°
Wind
15 mph23 km/h, gusts 38 mph61 km/h
UV peak
3
Friday, Oct 30. Rain. High 63°17°, low 47°8°. Rain 0.04 in1 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 51°11°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 58°15°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 55°13°
  20% chance · 0.02 in0.5 mm
4. Overnight
  midnight–6 AM
  Drizzle, 54°12°
  20% chance · 0.04 in1.1 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain. Partly sunny, with a high near 63. Chance of precipitation is 20%.
Night: A chance of rain. Mostly cloudy, with a low around 47. Chance of precipitation is 50%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
54°12°–65°18°
Low, likely
45°7°–49°9°
Wind
22 mph35 km/h, gusts 34 mph55 km/h
Saturday, Oct 31. Rain. High 60°16°, low 51°11°. Rain 0.34 in8.6 mm, 50% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 55°13°
  30% chance · 0.01 in0.3 mm
2. Afternoon
  noon–6 PM
  Drizzle, 60°16°
  40% chance · 0.05 in1.2 mm
3. Evening
  6 PM–midnight
  Showers, 54°12°
  40% chance · 0.29 in7.4 mm
4. Overnight
  midnight–6 AM
  Drizzle, 49°10°
  40% chance · 0.1 in2.5 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Mostly cloudy, with a high near 60. Chance of precipitation is 50%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
49°9°–67°19°
Low, likely
42°6°–57°14°
Wind
19 mph30 km/h, gusts 33 mph54 km/h
UV peak
2
Sunday, Nov 1. Drizzle. High 56°13°, low 46°8°. Rain 0.15 in3.8 mm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 49°10°
  30% chance
2. Afternoon
  noon–6 PM
  Cloudy, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 50°10°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 45°7°
  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
41°5°–64°18°
Low, likely
32°0°–56°13°
Wind
18 mph29 km/h, gusts 27 mph43 km/h
UV peak
3
Monday, Nov 2. Partly sunny. High 57°14°, low 42°6°. Rain 0.36 in9.1 mm, 30% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 48°9°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 57°14°
  20% chance · 0.04 in1.1 mm
3. Evening
  6 PM–midnight
  Partly cloudy, 48°9°
  30% chance
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
50°10°–64°18°
Low, likely
30°−1°–47°8°
Wind
29 mph47 km/h, gusts 51 mph82 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
70% chance of rain, high 65°, low 37°.
Tomorrow
69% chance of rain, high 46°, low 34°, cooling off.
Monday
99% chance of rain, high 43°, low 36°, cooling off.
Rest of week
Highs 54–63°; chance of precipitation on Tuesday, Saturday.

Want the meteorologists’ reasoning? Read the NWS forecast discussion (ABR) (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

West Branch Lac Qui Parle River at Gary

12 mi

Below flood stage

Level: 1375 ft

Reading from Sat 7:15 PM · NWS gauge page

Mud Creek near Albee

17 mi

Level: 1133 ft

Reading from Sat 7 PM · NWS gauge page

Big Sioux River below Watertown

18 mi

Below flood stage

Level: 4.5 ft

Reading from Sat 6:45 PM · NWS gauge page

Willow Creek near Watertown

18 mi

Below flood stage

Level: 5.7 ft
Flow: 16 cfs

Reading from Sat 7 PM · NWS gauge page

Sun & moon

Sun

Daylight: 10 h 33 min; Losing 2 min 53 s a day; shortest Dec 21, 1 h 45 min less
Golden hour: 5:45–6:45 PM; Morning 7:35–8:35 AM
Blue hour: 6:45–6:56 PM; Morning 7:24–7:35 AM; first light 7:24 AM

Stars tonight? Poor

Clouds most of the night (about 75% cover).

Moon

Waxing gibbous

98% lit · growing

Today: sets 6:06 AM · rises 5:26 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Altamont. The highest point on the skyline is about 3,400 ft, 25 mi away.Skyline from USGS elevation data, heights drawn up to 6× taller. Sky, sun and moon as they are now.

Altamont, SD weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

West Branch Lac Qui Parle River at Gary

Mud Creek near Albee

Big Sioux River below Watertown

Willow Creek near Watertown

Sun & moon

Sun

Stars tonight? Poor

Moon