Custer, Montana Weather
Monsoon storms drench the south. Day 14 of summer. Read this microseason across nine climate regions →
Custer weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——93°60°—
- SundayJul 5Overcast24%—95°65°+2°
- MondayJul 6Light Showers32%0.03″91°69°-4°
- TuesdayJul 7Light Rain32%0.07″75°62°-16°
- WednesdayJul 8Overcast29%—95°60°+20°
- ThursdayJul 9Overcast29%—92°68°-3°
- FridayJul 10Clear12%—91°66°-1°
AQI 44 (Good), driven by PM2.5. AQI down 15 over the last 6 hours — air quality is improving sharply. PM2.5 at 7.9 µg/m³ (AQI 44) with a 0.84 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 11 around 1 PM.
- Present
- AQI 34
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 7.9 µg/m³ (AQI 44) with a 0.84 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.84
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:15 PM
- Moonset
- 10:12 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Custer at a glance
- Today vs. normal: 64°F — typical for the season
- Last frost: May 23 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 59024
15-Day Forecast — Custer
- Sat93°60°6%
- Sun95°65°24%
- Mon91°69°32%
- Tue75°62°32%
- Wed95°60°29%
- Thu92°68°29%
- Fri91°66°12%
- Sat100°65°6%
- Sun95°71°6%
- Mon88°64°9%
- Tue104°64°13%
- Wed108°76°16%
- Thu97°75°16%
- Fri104°71°16%
- Sat111°76°15%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 — Custer
SPC includes Custer in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Custer
- 59024