Model estimate for 1:00 PM MDT (no recent station report)

Mammoth, WY weather

Sunny and 37°3°.

Mostly agree

Now 37°3°

Sunny · Feels like 33°1°

Wind: 5 mph8 km/h; From the southeast. 35–7 mph11 km/h through 1 AM
Dew point: 28°−2°; Dry, static shocks likely
UV index: 3Moderate; Moderate until 3 PM · peak 4

No precipitation expected in the next 2 hours.

From forecast models

Next 48 hours

Good hours for

High 46°8° today at 5 PM
Below 40°4° tonight after 8 PM
Below freezing tonight 1–10 AM (low 29°−2°)
Above 40°4° tomorrow by 1 PM
Below freezing tomorrow night 2–8 AM (low 30°−1°)

This afternoonUp to 46°8° by 5 PM · Clear
TonightDown to 30°−1° by 4 AM · freezing, low 30°−1° · Clear
Tomorrow morningUp to 36°2° by 11 AM · freezing, low 29°−2° · Clear
Tomorrow afternoonUp to 51°11° by 4 PM · Clear
Tomorrow nightDown to 31°−1° by 3 AM · freezing, low 31°−1° · Partly cloudy
Monday morningUp to 40°4° by 11 AM · freezing, low 30°−1° · Partly 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 1p	Sunny	37°3° (likely 37°3° to 43°6°)	33°1°	0%	5 mph8 km/h from SE, gusts 7 mph12 km/h	71%	17%	3
Sat 2p	Sunny	41°5° (likely 41°5° to 47°8°)	39°4°	0%	3 mph5 km/h from SE, gusts 8 mph13 km/h	63%	17%	3
Sat 3p	Sunny	44°7° (likely 43°6° to 49°9°)	41°5°	0%	6 mph10 km/h from SSE, gusts 9 mph14 km/h	53%	17%	2
Sat 4p	Sunny	45°7° (likely 43°6° to 49°9°)	41°5°	0%	7 mph11 km/h from S, gusts 9 mph15 km/h	50%	13%	1
Sat 5p	Sunny	46°8° (likely 42°6° to 49°9°)	44°7°	0%	5 mph8 km/h from SSW, gusts 8 mph13 km/h	49%	11%	0
Sat 6p	Clear	41°5° (likely 39°4° to 45°7°)	38°3°	0%	5 mph8 km/h from SW, gusts 6 mph9 km/h	61%	10%	1
Sat 7p	Clear	40°4° (likely 35°2° to 40°4°)	37°3°	0%	5 mph8 km/h from SSW, gusts 8 mph12 km/h	62%	2%	0
Sat 8p	Clear	38°3° (likely 33°1° to 39°4°)	34°1°	0%	6 mph10 km/h from S, gusts 8 mph13 km/h	66%	7%	0
Sat 9p	Clear	35°2° (likely 31°−1° to 38°3°)	30°−1°	0%	6 mph10 km/h from S, gusts 8 mph13 km/h	69%	9%	0
Sat 10p	Clear	34°1° (likely 29°−2° to 37°3°)	30°−1°	0%	5 mph8 km/h from SSE, gusts 7 mph11 km/h	70%	8%	0
Sat 11p	Clear	33°1° (likely 28°−2° to 37°3°)	29°−2°	0%	5 mph8 km/h from SSE, gusts 6 mph10 km/h	73%	9%	0
Sun 12a	Clear	33°1° (likely 27°−3° to 37°3°)	29°−2°	0%	5 mph8 km/h from SSE, gusts 6 mph9 km/h	73%	9%	0
Sun 1a	Clear	32°0° (likely 27°−3° to 37°3°)	26°−3°	0%	6 mph10 km/h from SE, gusts 6 mph10 km/h	75%	9%	0
Sun 2a	Clear	32°0° (likely 26°−3° to 37°3°)	26°−3°	0%	6 mph10 km/h from SE, gusts 5 mph9 km/h	77%	8%	0
Sun 3a	Clear	31°−1° (likely 26°−3° to 37°3°)	24°−4°	0%	7 mph11 km/h from SSE, gusts 5 mph8 km/h	77%	8%	0
Sun 4a	Clear	30°−1° (likely 25°−4° to 37°3°)	24°−4°	0%	6 mph10 km/h from SSE, gusts 5 mph9 km/h	77%	8%	0
Sun 5a	Clear	30°−1° (likely 26°−3° to 36°2°)	24°−4°	0%	6 mph10 km/h from SSE, gusts 6 mph9 km/h	79%	8%	0
Sun 6a	Clear	30°−1° (likely 25°−4° to 37°3°)	24°−4°	0%	6 mph10 km/h from SSE, gusts 6 mph10 km/h	78%	6%	0
Sun 7a	Clear	29°−2° (likely 25°−4° to 38°3°)	24°−4°	0%	5 mph8 km/h from SE, gusts 5 mph9 km/h	78%	6%	0
Sun 8a	Sunny	29°−2° (likely 25°−4° to 37°3°)	24°−4°	0%	5 mph8 km/h from SE, gusts 6 mph9 km/h	80%	8%	0
Sun 9a	Sunny	30°−1° (likely 27°−3° to 37°3°)	26°−3°	0%	3 mph5 km/h from SSE, gusts 4 mph7 km/h	77%	6%	0
Sun 10a	Sunny	33°1° (likely 32°0° to 40°4°)	33°1°	0%	2 mph3 km/h from ENE, gusts 4 mph7 km/h	77%	1%	1
Sun 11a	Sunny	36°2° (likely 36°2° to 43°6°)	33°1°	0%	3 mph5 km/h from NNE, gusts 4 mph7 km/h	71%	0%	3
Sun 12p	Sunny	39°4° (likely 39°4° to 47°8°)	37°3°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	62%	6%	4
Sun 1p	Sunny	44°7° (likely 44°7° to 50°10°)	42°6°	0%	3 mph5 km/h from N, gusts 5 mph8 km/h	54%	5%	4
Sun 2p	Sunny	48°9° (likely 47°8° to 53°12°)	46°8°	0%	5 mph8 km/h from NNW, gusts 6 mph9 km/h	44%	0%	4
Sun 3p	Sunny	50°10° (likely 49°9° to 54°12°)	48°9°	0%	6 mph10 km/h from NW, gusts 7 mph11 km/h	36%	0%	4
Sun 4p	Sunny	51°11° (likely 49°9° to 54°12°)	51°11°	0%	8 mph13 km/h from NW, gusts 9 mph14 km/h	37%	8%	3
Sun 5p	Sunny	49°9° (likely 46°8° to 52°11°)	46°8°	0%	8 mph13 km/h from NW, gusts 10 mph16 km/h	42%	1%	2
Sun 6p	Clear	43°6° (likely 42°6° to 47°8°)	39°4°	0%	6 mph10 km/h from WNW, gusts 10 mph16 km/h	55%	19%	1
Sun 7p	Clear	41°5° (likely 37°3° to 43°6°)	38°3°	0%	5 mph8 km/h from NW, gusts 9 mph15 km/h	60%	20%	0
Sun 8p	Clear	37°3° (likely 33°1° to 41°5°)	34°1°	0%	3 mph5 km/h from WSW, gusts 8 mph14 km/h	63%	23%	0
Sun 9p	Mostly clear	36°2° (likely 31°−1° to 39°4°)	36°2°	0%	2 mph3 km/h from S, gusts 8 mph12 km/h	65%	42%	0
Sun 10p	Cloudy	35°2° (likely 29°−2° to 38°3°)	32°0°	0%	3 mph5 km/h from S, gusts 5 mph9 km/h	66%	57%	0
Sun 11p	Partly cloudy	34°1° (likely 29°−2° to 37°3°)	30°−1°	0%	5 mph8 km/h from SSE, gusts 4 mph6 km/h	70%	48%	0
Mon 12a	Partly cloudy	33°1° (likely 28°−2° to 36°2°)	28°−2°	0%	6 mph10 km/h from SSE, gusts 4 mph6 km/h	73%	47%	0
Mon 1a	Cloudy	33°1° (likely 32°0° to 36°2°)	28°−2°	0%	6 mph10 km/h from SSE, gusts 6 mph9 km/h	74%	60%	0
Mon 2a	Cloudy	32°0° (likely 32°0° to 36°2°)	26°−3°	0%	7 mph11 km/h from SSE, gusts 7 mph11 km/h	77%	59%	0
Mon 3a	Mostly clear	31°−1° (likely 30°−1° to 37°3°)	24°−4°	0%	8 mph13 km/h from SSE, gusts 8 mph12 km/h	77%	50%	0
Mon 4a	Partly cloudy	31°−1° (likely 29°−2° to 37°3°)	24°−4°	0%	7 mph11 km/h from SSE, gusts 7 mph12 km/h	78%	44%	0
Mon 5a	Partly cloudy	31°−1° (likely 29°−2° to 37°3°)	24°−4°	0%	7 mph11 km/h from SSE, gusts 7 mph11 km/h	80%	41%	0
Mon 6a	Partly cloudy	30°−1° (likely 30°−1° to 37°3°)	23°−5°	0%	7 mph11 km/h from SSE, gusts 6 mph9 km/h	78%	41%	0
Mon 7a	Clear	32°0° (likely 29°−2° to 36°2°)	26°−3°	0%	7 mph11 km/h from SSE, gusts 6 mph9 km/h	78%	23%	0
Mon 8a	Mostly cloudy	33°1° (likely 29°−2° to 36°2°)	27°−3°	0%	7 mph11 km/h from SSE, gusts 6 mph9 km/h	79%	28%	0
Mon 9a	Partly sunny	33°1° (likely 31°−1° to 40°4°)	28°−2°	0%	6 mph10 km/h from SSE, gusts 6 mph10 km/h	79%	38%	0
Mon 10a	Partly sunny	36°2° (likely 36°2° to 44°7°)	31°−1°	0%	6 mph10 km/h from SSE, gusts 7 mph11 km/h	78%	49%	1
Mon 11a	Partly sunny	40°4° (likely 40°4° to 47°8°)	36°2°	0%	6 mph10 km/h from S, gusts 10 mph16 km/h	76%	54%	2
Mon 12p	Partly sunny	43°6° (likely 43°6° to 50°10°)	39°4°	0%	6 mph10 km/h from S, gusts 14 mph23 km/h	72%	72%	3

Days ahead

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

Today, Oct 24. Mostly sunny. High 46°8°, low 28°−2°. Typical 50°10° / 26°−3°. Dry. Mostly agree.
1. Afternoon
  noon–6 PM
  Sunny, 46°8°
  Dry
2. Evening
  6 PM–midnight
  Clear, 38°3°
  Dry
3. Overnight
  midnight–6 AM
  Clear, 30°−1°
  Dry
Official NWS forecast
Today: Sunny, with a high near 46. South southeast wind 3 to 7 mph.
Tonight: Mostly clear, with a low around 28. South wind around 7 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
43°6°–50°10°
Low, likely
22°−6°–28°−2°
Typical high / low
50°10° / 26°−3°
Wind
13 mph21 km/h, gusts 22 mph35 km/h
UV peak
4
Tomorrow, Oct 25. Mostly sunny. High 51°11°, low 29°−2°. Typical 49°9° / 26°−3°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Sunny, 29°−2°
  Dry
2. Afternoon
  noon–6 PM
  Sunny, 51°11°
  Dry
3. Evening
  6 PM–midnight
  Mostly clear, 37°3°
  Dry
4. Overnight
  midnight–6 AM
  Mostly clear, 31°−1°
  Dry
Official NWS forecast
Day: Sunny, with a high near 51. North northeast wind 2 to 8 mph.
Night: Mostly clear, with a low around 29. South southwest wind 2 to 8 mph.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
49°9°–54°12°
Low, likely
25°−4°–36°2°
Typical high / low
49°9° / 26°−3°
Wind
11 mph18 km/h
UV peak
4
Monday, Oct 26. Partly sunny. High 50°10°, low 32°0°. Typical 49°9° / 26°−3°. Dry. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 33°1°
  Dry
2. Afternoon
  noon–6 PM
  Cloudy, 51°11°
  Dry
3. Evening
  6 PM–midnight
  Cloudy, 40°4°
  40% chance · 0.01 in0.4 mm
4. Overnight
  midnight–6 AM
  Rain, 36°2°
  60% chance · 0.06 in1.5 mm
Official NWS forecast
Day: Mostly sunny, with a high near 50. South wind around 8 mph.
Night: A chance of rain showers before 9pm, then rain and snow showers likely. Mostly cloudy, with a low around 32. South wind 5 to 12 mph. Chance of precipitation is 70%.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
48°9°–52°11°
Low, likely
26°−3°–35°2°
Typical high / low
49°9° / 26°−3°
Wind
11 mph18 km/h, gusts 28 mph45 km/h
UV peak
4
Tuesday, Oct 27. Snow. High 42°6°, low 28°−2°. Typical 48°9° / 25°−4°. Snow 0–1 in0–3 cm, 80% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Snow, 34°1°
  70% chance · 0.03 in0.7 mm
2. Afternoon
  noon–6 PM
  Drizzle, 39°4°
  60% chance · 0.02 in0.6 mm
3. Evening
  6 PM–midnight
  Drizzle, 35°1°
  40% chance · 0.02 in0.4 mm
4. Overnight
  midnight–6 AM
  Snow, 33°0°
  30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain and snow showers. Mostly cloudy, with a high near 42. Southwest wind around 12 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New snow accumulation of less than half an inch possible.
Night: A slight chance of snow showers before midnight. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
35°2°–42°6°
Low, likely
28°−2°–35°2°
Typical high / low
48°9° / 25°−4°
Wind
19 mph30 km/h, gusts 36 mph58 km/h
UV peak
3
Wednesday, Oct 28. Mostly cloudy. High 45°7°, low 29°−2°. Typical 48°9° / 25°−4°. Dry. Forecasts differ.
1. Morning
  6 AM–noon
  Cloudy, 33°0°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 41°5°
  Dry
3. Evening
  6 PM–midnight
  Partly cloudy, 34°1°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 31°0°
  Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 45.
Night: Partly cloudy, with a low around 29.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
High, likely
37°3°–45°7°
Low, likely
25°−4°–34°1°
Typical high / low
48°9° / 25°−4°
Wind
15 mph23 km/h, gusts 33 mph53 km/h
UV peak
4
Thursday, Oct 29. Snow. High 47°8°, low 32°0°. Typical 47°8° / 25°−4°. Snow 0–1 in0–3 cm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Cloudy, 34°1°
  20% chance
2. Afternoon
  noon–6 PM
  Cloudy, 45°7°
  30% chance · 0.04 in1 mm
3. Evening
  6 PM–midnight
  Drizzle, 39°4°
  40% chance · 0.06 in1.4 mm
4. Overnight
  midnight–6 AM
  Snow, 36°2°
  40% chance · 0.1 in0.3 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of rain and snow showers. Partly sunny, with a high near 47.
Night: A chance of rain showers before 9pm, then a chance of rain and snow showers. Mostly cloudy, with a low around 32.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
42°6°–47°8°
Low, likely
23°−5°–35°2°
Typical high / low
47°8° / 25°−4°
Wind
13 mph21 km/h, gusts 31 mph49 km/h
UV peak
4
Friday, Oct 30. Snow. High 48°9°, low 31°−1°. Typical 47°8° / 24°−4°. Snow 0–1 in0–3 cm, 40% chance. Mostly agree.
1. Morning
  6 AM–noon
  Snow, 36°2°
  50% chance · 0.09 in2.3 mm
2. Afternoon
  noon–6 PM
  Rain, 39°4°
  40% chance · 0.13 in3.4 mm
3. Evening
  6 PM–midnight
  Rain, 35°2°
  30% chance · 0.04 in1 mm
4. Overnight
  midnight–6 AM
  Snow, 30°−1°
  40% chance · 0.01 in0.3 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and snow showers. Partly sunny, with a high near 48.
Night: A chance of rain and snow showers. Mostly cloudy, with a low around 31.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
High, likely
38°3°–48°9°
Low, likely
25°−4°–35°2°
Typical high / low
47°8° / 24°−4°
Wind
14 mph22 km/h, gusts 34 mph54 km/h
UV peak
1
Saturday, Oct 31. Snow. High 37°3°, low 22°−6°. Typical 46°8° / 24°−4°. Snow < 1 in< 2 cm, 40% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Snow, 31°−1°
  30% chance · 0.02 in0.5 mm
2. Afternoon
  noon–6 PM
  Sunny, 37°3°
  30% chance · 0.02 in0.5 mm
3. Evening
  6 PM–midnight
  Clear, 29°−2°
  20% chance
4. Overnight
  midnight–6 AM
  Mostly clear, 21°−6°
  20% 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
34°1°–44°7°
Low, likely
18°−8°–29°−2°
Typical high / low
46°8° / 24°−4°
Wind
17 mph28 km/h
UV peak
4
Sunday, Nov 1. Cloudy. High 37°3°, low 20°−7°. Typical 46°8° / 24°−4°. Rain 0.02 in0.5 mm, 20% chance. Forecasts differ.
1. Morning
  6 AM–noon
  Partly sunny, 23°−5°
  Dry
2. Afternoon
  noon–6 PM
  Partly sunny, 37°3°
  Dry
3. Evening
  6 PM–midnight
  Clear, 29°−2°
  Dry
4. Overnight
  midnight–6 AM
  Clear, 25°−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
33°1°–43°6°
Low, likely
14°−10°–32°0°
Typical high / low
46°8° / 24°−4°
Wind
10 mph17 km/h
UV peak
4
Monday, Nov 2. Snow. High 37°3°, low 23°−5°. Typical 45°7° / 24°−4°. Snow 0–2 in0–5 cm, 20% chance. Mostly agree.
1. Morning
  6 AM–noon
  Partly sunny, 30°−1°
  Dry
2. Afternoon
  noon–6 PM
  Snow, 38°3°
  Dry
3. Evening
  6 PM–midnight
  Snow, 33°1°
  20% chance · 0.2 in0.5 cm
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
35°2°–41°5°
Low, likely
18°−8°–31°−1°
Typical high / low
45°7° / 24°−4°
Wind
9 mph14 km/h, gusts 34 mph55 km/h
UV peak
3

10 days15 days30 days

The outlook

Today
Dry, high 46°, low 28°.
Tomorrow
Dry, high 51°, low 29°, warming up.
Monday
Dry, high 50°, low 32°.
Rest of week
Highs 37–48°; chance of precipitation on Tuesday.

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

Boiling River at Mammoth (YNP)

0.8 mi

Level: 1.1 ft
Flow: 22 cfs

Reading from Sat 11:15 AM · NWS gauge page

Gardner River near Mammoth

1.3 mi

Below flood stage

Level: 1.9 ft
Flow: 148 cfs

Reading from Sat 11:45 AM · NWS gauge page

Yellowstone River at Corwin Springs

11 mi

Below flood stage

Level: 1.4 ft
Flow: 1,110 cfs

Reading from Sat 11 AM · NWS gauge page

Lamar River near Tower Falls

15 mi

Below flood stage

Level: 1.1 ft
Flow: 323 cfs

Reading from Sat 11:15 AM · NWS gauge page

For your home

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

Heating this week

About 72% less heating than a typical week.

This week 56Typical 198

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 2 hours are near freezing and damp, when outdoor units defrost more often.

Comfort

Dry air outside (dew point 28°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?

Yellowstone Park Mammoth · official normals 1991–2020 · records 1894–2026

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

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

Sun & moon

Sun

Daylight: 10 h 32 min; Losing 2 min 58 s a day; shortest Dec 21, 1 h 46 min less
Golden hour: 5:41–6:41 PM; Morning 7:32–8:31 AM
Blue hour: 6:41–6:52 PM; Morning 7:20–7:32 AM; first light 7:20 AM

Stars tonight? Fair

Clear 6:52 PM–7:21 AM, but the moon is 99% lit and up.

Moon

Waxing gibbous

97% lit · growing

Today: sets 6:05 AM · rises 5:23 PM
Full moon: Oct 25
New moon: Nov 9

Looking west from Mammoth. The highest point on the skyline is about 9,600 ft, 4 mi away.Skyline from USGS elevation data, heights drawn up to 2× taller. Sky, sun and moon as they are now.

Mammoth, WY weather

Next 2 hours

Next 48 hours

Days ahead

The outlook

Today

Tomorrow

Monday

Rest of week

What changed since yesterday

Radar

Rivers

Boiling River at Mammoth (YNP)

Gardner River near Mammoth

Yellowstone River at Corwin Springs

Lamar River near Tower Falls

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? Fair

Moon