St. Onge, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Onge weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast13%—87°57°—
- SundayJul 5Overcast——99°65°+12°
- MondayJul 6Overcast14%—96°70°-3°
- TuesdayJul 7Thunderstorm65%0.03″92°66°-4°
- WednesdayJul 8Light Drizzle65%—84°61°-8°
- ThursdayJul 9Overcast41%—87°65°+3°
- FridayJul 10Clear20%—85°59°-2°
AQI 63 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.2 µg/m³ (AQI 66) with a 0.80 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
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 58 now. With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 56 around 1 PM.
- Present
- AQI 58
- UV peak
- 7.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 56
PM × Wind × Precip
PM2.5 at 17.2 µg/m³ (AQI 66) with a 0.80 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 10:57 PM
- Moonset
- 9:58 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
St. Onge at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: May 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Onge
- Sat87°57°13%
- Sun99°65°2%
- Mon96°70°14%
- Tue92°66°65%
- Wed84°61°65%
- Thu87°65°41%
- Fri85°59°20%
- Sat89°57°11%
- Sun99°64°5%
- Mon102°68°8%
- Tue108°72°17%
- Wed110°76°19%
- Thu94°66°26%
- Fri88°62°27%
- Sat87°56°19%
- Sun94°61°22%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, 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 — St. Onge
SPC has placed St. Onge in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWNONENo severe 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 St. Onge
- 57779