Big Sky, Montana Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Big Sky weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——78°38°—
- SundayJul 5Overcast23%—79°55°+1°
- MondayJul 6Showers64%0.24″75°53°-4°
- TuesdayJul 7Heavy Showers64%0.62″68°50°-7°
- WednesdayJul 8Light Showers31%0.13″77°51°+9°
- ThursdayJul 9Clear25%—74°47°-3°
- FridayJul 10Clear——78°48°+4°
AQI 49 (Good), driven by Ozone. AQI up 13 over the last 6 hours (gradual rise). Ozone at AQI 55 — 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 55 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 55
- UV peak
- 1.8 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 55
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
- 11:49 PM
- Moonset
- 11:40 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Big Sky at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: May 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 59716
16-Day Forecast — Big Sky
- Sat78°38°1%
- Sun79°56°23%
- Mon75°53°64%
- Tue68°50°64%
- Wed77°51°31%
- Thu74°47°25%
- Fri78°48°2%
- Sat86°54°2%
- Sun91°60°4%
- Mon88°59°13%
- Tue92°60°32%
- Wed92°61°24%
- Thu90°61°24%
- Fri90°59°26%
- Sat93°59°15%
- Sun87°57°16%
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 — Big Sky
SPC has placed Big Sky 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 Big Sky
- 59730
- 59716