Grenville, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Grenville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Partly Cloudy12%—87°60°—
- SundayJul 5Clear——88°63°+1°
- MondayJul 6Heavy Showers45%0.74″94°66°+6°
- TuesdayJul 7T-storm w/ Hail56%0.36″85°63°-9°
- WednesdayJul 8Heavy Drizzle74%0.02″77°61°-8°
- ThursdayJul 9Light Drizzle19%0.02″75°59°-2°
- FridayJul 10Light Drizzle18%—71°58°-4°
AQI 60 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 48 now. With UV 5.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 36 around 1 PM.
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 48 now. With UV 5.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 36 around 1 PM.
- Present
- AQI 48
- UV peak
- 5.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 36
PM × Wind × Precip
PM2.5 at 7.9 µg/m³ (AQI 44) with a 0.81 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.81
- 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
- 11:33 PM
- Moonset
- 10:30 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Grenville at a glance
- Today vs. normal: 18°F above the seasonal normal for this latitude
- Last frost: May 19 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57239
16-Day Forecast — Grenville
- Sat87°60°12%
- Sun88°63°1%
- Mon94°66°45%
- Tue85°63°56%
- Wed77°61°74%
- Thu75°59°19%
- Fri71°58°18%
- Sat77°55°18%
- Sun81°58°14%
- Mon85°60°8%
- Tue90°64°10%
- Wed95°66°11%
- Thu87°69°13%
- Fri79°60°20%
- Sat76°59°20%
- Sun86°57°18%
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 — Grenville
SPC has placed Grenville in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWNONENo severe risk
- DAY 3MRGLMarginal 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.
ZIP codes in Grenville
- 57239
- 57274