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

Big Arm, Montana Weather

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

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

Big Arm, MT
Saturday, July 4 at 6:33 PM
80
°
Clear
Feels like
73°
Humidity
26%
Wind
12 mph
Sunrise
11:44 PM
Sunset
3:38 PM
Big Arm, MT
Hour by hour · 24h
24-Hour ForecastBig Arm, MT: 24-hour forecast. Temperatures range from 61 to 81 degrees Fahrenheit.
L 61°H 81°
Big Arm, MT
7-day forecast
  1. Today
    Jul 4
    Clear
    81°58°
  2. Sunday
    Jul 5
    Overcast
    81°61°
  3. Monday
    Jul 6
    Overcast
    13%
    74°55°-7°
  4. Tuesday
    Jul 7
    Overcast
    13%
    86°53°+12°
  5. Wednesday
    Jul 8
    Light Drizzle
    79°56°-7°
  6. Thursday
    Jul 9
    Overcast
    81°49°+2°
  7. Friday
    Jul 10
    Clear
    85°50°+4°
Big Arm, MT
Anemometer · 24h winds · from true
NESW
From · True
W
261° · veering 28°
Direction
W
261°
Sustained
12
mph
Gust
20
mph
Peak 24h
20
avg 7
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 7 · pk 20 @ 4:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 2110SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 28° from the w.
Big Arm, MT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
889.8
-1.1 mb in 3h · falling · 26.28 inHg
Now
889.8
mb
3h
-1.1
mb
12h
+2.9
mb
24h
-0.5
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 887892
880885890895900-21h-18h-15h-12h-9h-6h-3h-24hNOW891.6887.2890.1
−24h−18h−12h−6hnow
Deep low still deepening — rough seas, strong wind, persistent rain.
Big Arm, MT
Air quality
43
AQI
Good
+15 in 6h

AQI 43 (Good), driven by Ozone. AQI up 15 in the last 6 hours — air quality is degrading. Ozone at AQI 50 — 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
0.8μg/m³
PM 10Good
1μg/m³
NO₂Good
0μg/m³
OzoneDRIVERUnhealthy SG
106μg/m³
UV IndexModerate
2.5

What's driving it

Ozone × UV × Sky

Ozone at AQI 50 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 50
UV peak
2.0 at earlier today
Sky at peak
clear
Projected peak
AQI 50
Big Arm, MT
Sky cover · visibility · 24h
Cloud cover
5%
CLEAR
100%0%−24h−18h−12h−6hnow

Visibility
137.6mi
UNLIMITED
136 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
00:33 UTC · Big Arm, 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
00:33 UTC · Big Arm, MT · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Big Arm, MT
Satellite · infrared · animated
Big Arm, MT
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Big Arm, MT
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:05 AM
Sunrise
11:44 PM
Daylight
15h 54m
Sunset
3:38 PM
Civil dusk
10:19 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Big Arm, MT
The moon
Waning Gibbous
77% illuminated
Moonrise
12:02 AM
Moonset
11:52 AM
In sign
♓︎ Pisces
Big Arm, MT
Microseason
Jul 1–5

Monsoon storms drench the south

insect
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Big Arm at a glance

  • Today vs. normal: 16°F above the seasonal normal for this latitude
  • Last frost: June 2 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP code: 59910

16-Day Forecast — Big Arm

  1. Sat81°58°1%
  2. Sun81°61°1%
  3. Mon74°55°13%
  4. Tue86°53°13%
  5. Wed79°56°4%
  6. Thu81°49°3%
  7. Fri85°50°1%
  8. Sat91°54°2%
  9. Sun85°57°2%
  10. Mon94°55°3%
  11. Tue96°57°8%
  12. Wed92°58°9%
  13. Thu90°54°11%
  14. Fri92°53°6%
  15. Sat91°55°3%
  16. Sun91°57°9%

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.

ZIP codes in Big Arm

  • 59860
  • 59910

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.