Roundup, Montana Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Roundup weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Partly Cloudy——92°51°—
- SundayJul 5Light Drizzle16%0.02″94°62°+2°
- MondayJul 6Drizzle57%—82°60°-12°
- TuesdayJul 7Light Showers57%—80°62°-2°
- WednesdayJul 8Light Drizzle34%—93°61°+13°
- ThursdayJul 9Overcast34%—84°64°-9°
- FridayJul 10Clear——89°60°+5°
AQI 45 (Good), driven by Ozone. AQI up 17 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.
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
- 1.4 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 49
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
- 11:38 PM
- Moonset
- 11:27 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Roundup at a glance
- Today vs. normal: 28°F above the seasonal normal for this latitude
- Last frost: May 25 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 59072
16-Day Forecast — Roundup
- Sat92°51°1%
- Sun94°62°16%
- Mon82°60°57%
- Tue80°62°57%
- Wed93°61°34%
- Thu84°64°34%
- Fri89°60°4%
- Sat102°65°4%
- Sun102°74°5%
- Mon103°74°9%
- Tue105°76°19%
- Wed107°75°21%
- Thu102°74°23%
- Fri100°65°12%
- Sat98°69°13%
- Sun93°69°17%
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 — Roundup
SPC has placed Roundup 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 Roundup
- 59072