Observed 3:55 PM MDT at KSUN

Arco, ID weather

Partly cloudy and 48°9°.

Mostly agree

Now 48°9°

Partly sunny · Feels like 44°7°

Wind: 9 mph15 km/h; From the east-southeast. Up to 9 mph15 km/h through 5 AM
Dew point: 36°2°; Comfortable · down to 27°−3° by 10 PM (dry)
UV tomorrow: 4Moderate; Moderate 12–5 PM · peak 4
Air quality: 31Good; Main pollutant: Ozone
Pressure: 30.22 inHg1023 hPa; Falling · −0.05 inHg−1.6 hPa in 3 h

None rain now, through the next 2 hours.

From forecast models

Next 48 hours

4°2° warmer than this time yesterday (45°7° then, 48°9° now)

Good hours for

Below 40°4° tonight after 9 PM
Hard freeze tonight 2–10 AM (low 28°−2°)
Above 40°4° tomorrow by 11 AM
High 56°13° tomorrow at 3 PM
Below freezing Monday 6–9 AM (low 31°−1°)

TonightDown to 30°−1° by 4 AM · freezing, low 30°−1° · Clear
Tomorrow morningUp to 45°7° by 11 AM · freezing, low 28°−2° · Clear
Tomorrow afternoonUp to 56°13° by 3 PM · Clear
Tomorrow nightDown to 33°1° by 3 AM · Mostly cloudy
Monday morningUp to 44°7° by 11 AM · freezing, low 31°−1° · Mostly cloudy
Monday afternoonUp to 54°12° by 3 PM · rain chance 10% · Mostly cloudy

Hourly forecast, next 48 hours, in the place's local time
Hour	Conditions	Temperature	Feels like	Precipitation	Wind	Humidity	Cloud cover	UV index
Sat 5p	Sunny	51°11° (likely 45°7° to 51°11°)	51°11°	0%	6 mph10 km/h from SE, gusts 6 mph9 km/h	46%	1%	1
Sat 6p	Sunny	49°9° (likely 43°6° to 49°9°)	47°8°	0%	5 mph8 km/h from SE, gusts 6 mph10 km/h	55%	1%	1
Sat 7p	Clear	45°7° (likely 38°3° to 45°7°)	45°7°	0%	2 mph3 km/h from SSE, gusts 6 mph9 km/h	63%	1%	0
Sat 8p	Clear	40°4° (likely 36°2° to 41°5°)	40°4°	0%	2 mph3 km/h from NW, gusts 2 mph4 km/h	67%	0%	0
Sat 9p	Clear	37°3° (likely 35°2° to 39°4°)	34°1°	0%	3 mph5 km/h from NNW, gusts 3 mph5 km/h	72%	0%	0
Sat 10p	Clear	35°2° (likely 34°1° to 37°3°)	32°0°	0%	3 mph5 km/h from N, gusts 4 mph6 km/h	73%	0%	0
Sat 11p	Clear	34°1° (likely 34°1° to 37°3°)	31°−1°	0%	3 mph5 km/h from NNW, gusts 3 mph5 km/h	76%	0%	0
Sun 12a	Clear	33°1° (likely 33°1° to 38°3°)	30°−1°	0%	3 mph5 km/h from N, gusts 4 mph6 km/h	79%	0%	0
Sun 1a	Clear	33°1° (likely 33°1° to 38°3°)	30°−1°	0%	3 mph5 km/h from N, gusts 3 mph5 km/h	78%	0%	0
Sun 2a	Clear	32°0° (likely 32°0° to 38°3°)	29°−2°	0%	3 mph5 km/h from N, gusts 3 mph5 km/h	77%	0%	0
Sun 3a	Clear	31°−1° (likely 31°−1° to 38°3°)	28°−2°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	80%	0%	0
Sun 4a	Clear	30°−1° (likely 30°−1° to 38°3°)	26°−3°	0%	3 mph5 km/h from N, gusts 4 mph6 km/h	79%	0%	0
Sun 5a	Clear	30°−1° (likely 30°−1° to 38°3°)	26°−3°	0%	3 mph5 km/h from N, gusts 4 mph6 km/h	79%	0%	0
Sun 6a	Clear	29°−2° (likely 29°−2° to 37°3°)	24°−4°	0%	5 mph8 km/h from N, gusts 4 mph6 km/h	83%	0%	0
Sun 7a	Clear	28°−2° (likely 28°−2° to 38°3°)	23°−5°	0%	5 mph8 km/h from N, gusts 5 mph8 km/h	80%	0%	0
Sun 8a	Sunny	29°−2° (likely 29°−2° to 38°3°)	24°−4°	0%	5 mph8 km/h from N, gusts 5 mph8 km/h	83%	0%	0
Sun 9a	Sunny	32°0° (likely 32°0° to 39°4°)	27°−3°	0%	5 mph8 km/h from NNE, gusts 4 mph6 km/h	81%	0%	0
Sun 10a	Sunny	39°4° (likely 38°3° to 42°6°)	37°3°	0%	3 mph5 km/h from N, gusts 4 mph7 km/h	71%	0%	1
Sun 11a	Sunny	45°7° (likely 44°7° to 46°8°)	45°7°	0%	2 mph3 km/h from E, gusts 7 mph11 km/h	61%	0%	2
Sun 12p	Sunny	50°10° (likely 46°8° to 50°10°)	50°10°	0%	2 mph3 km/h from SSE, gusts 6 mph9 km/h	56%	1%	3
Sun 1p	Sunny	53°12° (likely 49°9° to 53°12°)	53°12°	0%	3 mph5 km/h from SE, gusts 6 mph9 km/h	51%	2%	4
Sun 2p	Sunny	55°13° (likely 50°10° to 55°13°)	55°13°	0%	3 mph5 km/h from SE, gusts 6 mph10 km/h	48%	10%	4
Sun 3p	Sunny	56°13° (likely 51°11° to 56°13°)	56°13°	0%	5 mph8 km/h from SE, gusts 6 mph10 km/h	46%	10%	4
Sun 4p	Mostly sunny	56°13° (likely 51°11° to 56°13°)	56°13°	0%	5 mph8 km/h from SSE, gusts 6 mph10 km/h	45%	29%	3
Sun 5p	Mostly sunny	55°13° (likely 51°11° to 55°13°)	55°13°	0%	5 mph8 km/h from SSE, gusts 6 mph10 km/h	46%	39%	2
Sun 6p	Partly sunny	53°12° (likely 48°9° to 53°12°)	53°12°	0%	2 mph3 km/h from SE, gusts 5 mph9 km/h	54%	45%	1
Sun 7p	Partly cloudy	48°9° (likely 43°6° to 48°9°)	48°9°	0%	2 mph3 km/h from SE, gusts 5 mph8 km/h	63%	52%	0
Sun 8p	Cloudy	43°6° (likely 42°6° to 45°7°)	43°6°	0%	2 mph3 km/h from SE, gusts 4 mph6 km/h	67%	67%	0
Sun 9p	Cloudy	41°5° (likely 41°5° to 44°7°)	41°5°	0%	2 mph3 km/h from N, gusts 5 mph8 km/h	72%	70%	0
Sun 10p	Cloudy	39°4° (likely 39°4° to 43°6°)	39°4°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	73%	70%	0
Sun 11p	Cloudy	37°3° (likely 37°3° to 43°6°)	37°3°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	79%	67%	0
Mon 12a	Cloudy	37°3° (likely 37°3° to 42°6°)	37°3°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	79%	65%	0
Mon 1a	Partly cloudy	36°2° (likely 36°2° to 42°6°)	36°2°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	81%	63%	0
Mon 2a	Partly cloudy	36°2° (likely 36°2° to 42°6°)	36°2°	0%	2 mph3 km/h from N, gusts 4 mph7 km/h	80%	85%	0
Mon 3a	Cloudy	33°1° (likely 33°1° to 42°6°)	33°1°	0%	2 mph3 km/h from NNE, gusts 4 mph7 km/h	85%	78%	0
Mon 4a	Cloudy	33°1° (likely 33°1° to 41°5°)	33°1°	0%	2 mph3 km/h from NNE, gusts 4 mph6 km/h	86%	80%	0
Mon 5a	Cloudy	33°1° (likely 33°1° to 41°5°)	33°1°	0%	2 mph3 km/h from NNE, gusts 4 mph6 km/h	86%	80%	0
Mon 6a	Cloudy	31°−1° (likely 31°−1° to 41°5°)	31°−1°	0%	2 mph3 km/h from NE, gusts 4 mph6 km/h	92%	85%	0
Mon 7a	Cloudy	32°0° (likely 32°0° to 41°5°)	32°0°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	90%	77%	0
Mon 8a	Partly sunny	32°0° (likely 32°0° to 41°5°)	32°0°	0%	2 mph3 km/h from NE, gusts 3 mph5 km/h	90%	69%	0
Mon 9a	Mostly cloudy	34°1° (likely 32°0° to 41°5°)	31°−1°	0%	3 mph5 km/h from NE, gusts 3 mph4 km/h	90%	45%	0
Mon 10a	Mostly cloudy	39°4° (likely 37°3° to 44°7°)	37°3°	0%	3 mph5 km/h from NE, gusts 4 mph6 km/h	84%	55%	1
Mon 11a	Mostly cloudy	44°7° (likely 41°5° to 47°8°)	42°6°	0%	3 mph5 km/h from NE, gusts 5 mph8 km/h	75%	62%	2
Mon 12p	Partly sunny	49°9° (likely 45°7° to 49°9°)	47°8°	10%	5 mph8 km/h from E, gusts 8 mph13 km/h	66%	61%	3
Mon 1p	Partly sunny	52°11° (likely 47°8° to 52°11°)	52°11°	10%	5 mph8 km/h from E, gusts 8 mph13 km/h	60%	68%	4
Mon 2p	Partly sunny	53°12° (likely 48°9° to 53°12°)	53°12°	10%	5 mph8 km/h from E, gusts 10 mph16 km/h	55%	58%	4
Mon 3p	Partly sunny	54°12° (likely 49°9° to 54°12°)	54°12°	10%	8 mph13 km/h from SSE, gusts 12 mph19 km/h	53%	54%	4
Mon 4p	Partly sunny	54°12° (likely 47°8° to 54°12°)	54°12°	10%	8 mph13 km/h from SSE, gusts 12 mph20 km/h	52%	71%	3

Days ahead

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

Today, Oct 24. Cloudy. High 51°11°, low 28°−2°. Typical 55°13° / 28°−2°. Dry. Mostly agree.
1. Evening
  6 PM–midnight
  Clear, 40°4°
  Dry
2. Overnight
  midnight–6 AM
  Clear, 30°−1°
  Dry
Official NWS forecast
Today: Sunny, with a high near 51. Southeast wind around 6 mph.
Tonight: Mostly clear. Low around 28, with temperatures rising to around 30 overnight. North wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
46°8°–51°11°
Low, likely
28°−2°–33°1°
Typical high / low
55°13° / 28°−2°
Wind
7 mph12 km/h, gusts 21 mph34 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 56°13°, low 31°−1°. Typical 54°12° / 27°−3°. Dry. Forecasts agree.
1. Morning
  6 AM–noon
  Sunny, 29°−2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 56°13°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 43°6°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 33°1°
  Dry
Official NWS forecast
Day: Sunny, with a high near 56. East southeast wind around 5 mph.
Night: Partly cloudy, with a low around 31. Northeast wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
High, likely
51°11°–56°13°
Low, likely
31°−1°–37°3°
Typical high / low
54°12° / 27°−3°
Wind
7 mph11 km/h
UV peak
4
Monday, Oct 26. Mostly cloudy. High 54°12°, low 27°−3°. Typical 54°12° / 27°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Mostly cloudy, 32°0°
  Dry
2. Afternoon
  noon–6 PM
  Drizzle, 54°12°
  30% chance · 0.05 in1.3 mm
3. Evening
  6 PM–midnight
  Showers, 44°6°
  60% chance · 0.19 in4.7 mm
4. Overnight
  midnight–6 AM
  Fog, 33°1°
  40% chance
Official NWS forecast
Day: Partly sunny, with a high near 54. East wind 2 to 8 mph.
Night: Rain likely before midnight, then a chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 60%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
49°9°–54°12°
Low, likely
27°−3°–37°3°
Typical high / low
54°12° / 27°−3°
Wind
16 mph26 km/h, gusts 30 mph48 km/h
UV peak
4
Tuesday, Oct 27. Cloudy. High 49°9°, low 23°−5°. Typical 53°12° / 26°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 31°−1°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 44°7°
  Dry
3. Evening
  6 PM–midnight
  Clear, 38°3°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 31°−1°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow before noon. Mostly sunny, with a high near 49. Chance of precipitation is 20%.
Night: Mostly clear, with a low around 23.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
42°6°–49°9°
Low, likely
23°−5°–34°1°
Typical high / low
53°12° / 26°−3°
Wind
25 mph40 km/h
UV peak
4
Wednesday, Oct 28. Partly sunny. High 51°11°, low 28°−2°. Typical 52°11° / 26°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Sunny, 30°−1°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 47°8°
  Dry
3. Evening
  6 PM–midnight
  Clear, 39°4°
  Dry
4. Overnight
  midnight–6 AM
  Cloudy, 35°2°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 51.
Night: Partly cloudy, with a low around 28.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
45°7°–51°11°
Low, likely
24°−4°–32°0°
Typical high / low
52°11° / 26°−3°
Wind
14 mph23 km/h, gusts 27 mph44 km/h
UV peak
4
Thursday, Oct 29. Mostly cloudy. High 52°11°, low 30°−1°. Typical 52°11° / 26°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 36°2°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 47°8°
  20% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Drizzle, 42°6°
  30% chance · 0.05 in1.3 mm
4. Overnight
  midnight–6 AM
  Fog, 36°2°
  40% chance · 0.04 in1.1 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 52.
Night: A chance of rain before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 50%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
47°8°–52°11°
Low, likely
30°−1°–37°3°
Typical high / low
52°11° / 26°−3°
Wind
10 mph16 km/h, gusts 34 mph55 km/h
UV peak
3
Friday, Oct 30. Snow. High 51°11°, low 28°−2°. Typical 51°11° / 25°−4°. Snow 0–3 in0–8 cm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Drizzle, 34°1°
  40% chance · 0.3 in0.8 cm
2. Afternoon
  noon–6 PM
  Drizzle, 42°6°
  30% chance · 0.3 in0.7 cm
3. Evening
  6 PM–midnight
  Cloudy, 39°4°
  20% chance · 0.03 in0.7 mm
4. Overnight
  midnight–6 AM
  Cloudy, 31°−1°
  20% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and snow. Partly sunny, with a high near 51. Chance of precipitation is 30%.
Night: A slight chance of rain before 9pm, then a chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
42°6°–51°11°
Low, likely
27°−3°–39°4°
Typical high / low
51°11° / 25°−4°
Wind
11 mph17 km/h, gusts 27 mph43 km/h
UV peak
2
Saturday, Oct 31. Cloudy. High 41°5°, low 29°−2°. Typical 51°11° / 25°−4°. Rain 0.09 in2.3 mm, 30% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 31°−1°
  20% chance
2. Afternoon
  noon–6 PM
  Sunny, 41°5°
  20% chance
3. Evening
  6 PM–midnight
  Clear, 33°0°
  20% chance · 0.2 in0.5 cm
4. Overnight
  midnight–6 AM
  Cloudy, 26°−3°
  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.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
39°4°–45°7°
Low, likely
17°−8°–37°3°
Typical high / low
51°11° / 25°−4°
Wind
10 mph15 km/h, gusts 18 mph28 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 39°4°, low 26°−3°. Typical 50°10° / 24°−4°. Rain 0.14 in3.6 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Mostly sunny, 26°−3°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 36°2°
  Dry
3. Evening
  6 PM–midnight
  Clear, 31°−1°
  Dry
4. Overnight
  midnight–6 AM
  Partly cloudy, 24°−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
33°1°–42°6°
Low, likely
13°−11°–31°−1°
Typical high / low
50°10° / 24°−4°
Wind
7 mph11 km/h, gusts 20 mph32 km/h
UV peak
4
Monday, Nov 2. Drizzle. High 40°4°, low 25°−4°. Typical 50°10° / 24°−4°. Rain 0.07 in1.8 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Drizzle, 27°−3°
  Dry
2. Afternoon
  noon–6 PM
  Mostly sunny, 38°3°
  Dry
3. Evening
  6 PM–midnight
  Drizzle, 32°0°
  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
36°2°–46°8°
Low, likely
15°−9°–31°−1°
Typical high / low
50°10° / 24°−4°
Wind
9 mph15 km/h, gusts 18 mph28 km/h
UV peak
1

10 days15 days30 days

The outlook

Today
Dry, high 51°, low 28°.
Tomorrow
Dry, high 56°, low 31°, warming up.
Monday
Dry, high 54°, low 27°.
Rest of week
Mostly dry, highs 39–52°.

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

Big Lost River at Arco At Sunset Road

1.3 mi

Level: 5.1 ft

Reading from Sat 2:45 PM · NWS gauge page

Big Lost River near Arco

3.8 mi

Below flood stage

Level: 2.0 ft

Reading from Sat 3 PM · NWS gauge page

Big Lost River below Moore Div Nr Moore

11 mi

Level: 9.4 ft
Flow: under 1 cfs

Reading from Sat 2:45 PM · NWS gauge page

Antelope Creek (ID) near Darlington

13 mi

Below flood stage

Level: 4.5 ft
Flow: 20 cfs

Reading from Sat 3 PM · NWS gauge page

For your home

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

Heating this week

About 73% less heating than a typical week.

This week 48Typical 177

Heating degree days, base 65°F

Heat-pump hours, next 7 days

h below 47°F: 33
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 15 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 36°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?

Arco · official normals 1991–2020 · records 1914–2026

Oct 24, today vs a typical year

Today’s expected high is 4°2° colder than typical.

Last 7 days vs normal

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

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

Sun & moon

Sun

Daylight: 10 h 36 min; Losing 2 min 49 s a day; shortest Dec 21, 1 h 40 min less
Golden hour: 5:55–6:53 PM; Morning 7:40–8:38 AM
Blue hour: 6:53–7:04 PM; Morning 7:29–7:40 AM; first light 7:29 AM

Stars tonight? Fair

Clear 7:04 PM–7:30 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

98% lit · growing

Today: sets 6:15 AM · rises 5:35 PM
Full moon: Oct 25
New moon: Nov 9

Looking north from Arco. The highest point on the skyline is about 11,900 ft, 34 mi away.Skyline from USGS elevation data, heights drawn up to 2× taller. Sky, sun and moon as they are now.