Acton, Montana Weather
Pikas hayfeeding in granite peaks. Day 77 of spring. Read this microseason across nine climate regions →
Acton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast14%—74°52°—
- FridayJun 5Mostly Clear——86°53°+12°
- SaturdayJun 6Drizzle——94°60°+8°
- SundayJun 7Drizzle39%0.02″71°48°-23°
- MondayJun 8Overcast21%—83°44°+12°
- TuesdayJun 9Overcast28%—85°59°+2°
- WednesdayJun 10Light Drizzle42%0.01″86°60°+1°
AQI 29 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
What's driving it
PM × Wind × Precip
PM2.5 at 4.9 µg/m³, PM10 at 5.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.83
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:07 AM
- Moonset
- 3:00 PM
- In sign
- ♑︎ Capricorn
Pikas hayfeeding in granite peaks
Acton at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: May 22 (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 4, 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 — Acton
SPC has placed Acton in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
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.