Simms, Montana Weather
Pikas hayfeeding in granite peaks. Day 76 of spring. Read this microseason across nine climate regions →
Simms weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——65°48°—
- ThursdayJun 4Light Drizzle19%0.02″67°52°+2°
- FridayJun 5Overcast——77°45°+10°
- SaturdayJun 6Light Drizzle48%—78°51°+1°
- SundayJun 7Light Drizzle48%0.02″65°46°-13°
- MondayJun 8Overcast21%—71°43°+6°
- TuesdayJun 9Overcast23%—70°50°-1°
Ozone at AQI 37 now. AQI flat over the last 6 hours (within ±3 points). With UV 4.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 17 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 37 now. With UV 4.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 17 by mid-afternoon.
- Present
- AQI 37
- UV peak
- 4.7 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 17
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
- 5:55 AM
- Moonset
- 1:58 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Simms at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: May 31 (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 — Simms
SPC has placed Simms in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- 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.