Weather StoryAlmanac, microseasons, and the day's weather story.

Mammoth, Montana Weather

Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →

Mammoth weather forecast — hour by hour, 7-day outlook, NOAA radar

Mammoth, MT
Saturday, July 4 at 6:30 PM
79
°
Clear
Feels like
70°
Humidity
18%
Wind
12 mph
Sunrise
11:44 PM
Sunset
3:20 PM
Mammoth, MT
Hour by hour · 24h
24-Hour ForecastMammoth, MT: 24-hour forecast. Temperatures range from 57 to 84 degrees Fahrenheit with a 25% chance of precipitation at 5 PM.
L 57°H 84°
Mammoth, MT
7-day forecast
  1. Today
    Jul 4
    Mostly Clear
    81°54°
  2. Sunday
    Jul 5
    Light Drizzle
    25%
    0.03″
    84°57°+3°
  3. Monday
    Jul 6
    Showers
    62%
    0.25″
    72°52°-12°
  4. Tuesday
    Jul 7
    Light Drizzle
    62%
    77°51°+5°
  5. Wednesday
    Jul 8
    Drizzle
    23%
    83°56°+6°
  6. Thursday
    Jul 9
    Partly Cloudy
    23%
    79°50°-4°
  7. Friday
    Jul 10
    Clear
    84°54°+5°
Mammoth, MT
Anemometer · 24h winds · from true
NESW
From · True
W
259° · backing 35°
Direction
W
259°
Sustained
12
mph
Gust
23
mph
Peak 24h
23
avg 6
Beaufort · 3 · GENTLE BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 6 · pk 23 @ 5:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 263SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 35° from the w.
Mammoth, MT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
821.1
-2.0 mb in 3h · falling · 24.25 inHg
Now
821.1
mb
3h
-2.0
mb
12h
+3.3
mb
24h
-0.3
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 818824
810815820825830-21h-18h-15h-12h-9h-6h-3h-24hNOW824.4817.8821.5
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Mammoth, MT
Air quality
46
AQI
Good
+20 in 6h

AQI 46 (Good), driven by Ozone. AQI up 20 in the last 6 hours — air quality is degrading. Ozone at AQI 49 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5Good
0.4μg/m³
PM 10Good
1μg/m³
NO₂Good
0μg/m³
OzoneDRIVERUnhealthy SG
103μg/m³
UV IndexModerate
2.3

What's driving it

Ozone × UV × Sky

Ozone at AQI 49 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 49
UV peak
1.8 at earlier today
Sky at peak
clear
Projected peak
AQI 49
Mammoth, MT
Sky cover · visibility · 24h
Cloud cover
0%
CLEAR
100%0%−24h−18h−12h−6hnow

Visibility
172.3mi
UNLIMITED
184 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
00:30 UTC · Mammoth, MT · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
00:30 UTC · Mammoth, MT · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Mammoth, MT
Satellite · infrared · animated
Mammoth, MT
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Mammoth, MT
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:07 AM
Sunrise
11:44 PM
Daylight
15h 36m
Sunset
3:20 PM
Civil dusk
9:59 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Mammoth, MT
The moon
Waning Gibbous
77% illuminated
Moonrise
11:51 PM
Moonset
11:43 AM
In sign
♓︎ Pisces
Mammoth, MT
Microseason
Jul 1–5

Monsoon storms drench the south

insect
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Mammoth at a glance

  • Today vs. normal: 13°F above the seasonal normal for this latitude
  • Last frost: May 20 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Mammoth

  1. Sat81°54°1%
  2. Sun84°58°25%
  3. Mon72°52°62%
  4. Tue77°51°62%
  5. Wed83°56°23%
  6. Thu79°50°23%
  7. Fri84°54°3%
  8. Sat94°60°3%
  9. Sun95°66°7%
  10. Mon95°67°13%
  11. Tue94°65°22%
  12. Wed97°64°20%
  13. Thu96°66°18%
  14. Fri95°62°19%
  15. Sat93°66°16%
  16. Sun89°60°18%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Mammoth

SPC has placed Mammoth in the Marginal Risk category for severe thunderstorms tomorrow.

  • TODAYNONENo severe risk
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

ZIP codes in Mammoth

  • 59747
  • 59721

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.