Roy, Montana Weather
Pikas hayfeeding in granite peaks. Day 76 of spring. Read this microseason across nine climate regions →
Roy weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——66°47°—
- ThursdayJun 4Rain29%0.13″67°49°+1°
- FridayJun 5Overcast——77°51°+10°
- SaturdayJun 6Overcast49%—87°55°+10°
- SundayJun 7Showers49%0.33″58°46°-29°
- MondayJun 8Overcast20%—75°44°+17°
- TuesdayJun 9Overcast18%—71°54°-4°
Ozone at AQI 34 now. AQI flat over the last 6 hours (within ±4 points). With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 33 by mid-afternoon.
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 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 33 by mid-afternoon.
- Present
- AQI 34
- UV peak
- 7.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 33
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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:42 AM
- Moonset
- 1:46 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Roy at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: May 30 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Warm-season window is open
As of June 3, 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.
SPC Convective Outlook
Storm Prediction Center — Roy
SPC has placed Roy in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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.