Custer, Montana Weather
Thunderheads build by noon. Day 89 of spring. Read this microseason across nine climate regions →
Custer weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——79°48°—
- TuesdayJun 16Overcast——91°59°+12°
- WednesdayJun 17Overcast——72°57°-19°
- ThursdayJun 18Overcast——74°49°+2°
- FridayJun 19Overcast——81°54°+7°
- SaturdayJun 20Light Drizzle40%—80°60°-1°
- SundayJun 21Light Drizzle40%0.04″62°57°-18°
AQI 44 (Good), driven by PM2.5. AQI up 10 over the last 6 hours (gradual rise). PM2.5 at 11.2 µg/m³, PM10 at 15.3 µg/m³ — typical background levels with no transport signature.
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 43 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 43
- UV peak
- 0.9 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 43
PM × Wind × Precip
PM2.5 at 11.2 µg/m³, PM10 at 15.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.73
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 6:30 AM
- Moonset
- 10:29 PM
- In sign
- ♋︎ Cancer
Thunderheads build by noon
Custer at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: May 23 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Custer
- Mon79°48°2%
- Tue91°59°4%
- Wed72°57°3%
- Thu74°49°8%
- Fri81°54°3%
- Sat80°60°40%
- Sun62°57°40%
- Mon57°50°29%
- Tue78°48°15%
- Wed91°59°14%
- Thu76°55°16%
- Fri85°62°16%
- Sat80°59°16%
- Sun83°62°10%
- Mon87°59°25%
- Tue100°68°26%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Warm-season window is open
As of June 16, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
ZIP codes in Custer
- 59024