Mount Vernon, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mount Vernon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——88°64°—
- SundayJul 5Clear——90°67°+2°
- MondayJul 6Overcast20%—94°68°+4°
- TuesdayJul 7Drizzle33%—98°70°+4°
- WednesdayJul 8Light Drizzle62%—82°69°-16°
- ThursdayJul 9Drizzle13%0.04″81°62°-1°
- FridayJul 10Mostly Clear13%—81°62°0°
AQI 55 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 17.3 µg/m³ (AQI 66) with a 0.69 fine-to-coarse ratio and 2 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 49 now. With UV 7.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 46 around 1 PM.
- Present
- AQI 49
- UV peak
- 7.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 46
PM × Wind × Precip
PM2.5 at 17.3 µg/m³ (AQI 66) with a 0.69 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.69
- Wind
- calm
- 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
- 11:34 PM
- Moonset
- 10:36 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mount Vernon at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57363
16-Day Forecast — Mount Vernon
- Sat88°64°8%
- Sun90°67°6%
- Mon94°68°20%
- Tue98°70°33%
- Wed82°69°62%
- Thu81°62°13%
- Fri81°62°13%
- Sat85°57°13%
- Sun85°63°8%
- Mon88°64°4%
- Tue94°65°7%
- Wed100°72°13%
- Thu91°74°17%
- Fri85°66°24%
- Sat83°60°15%
- Sun88°57°20%
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 — Mount Vernon
SPC has placed Mount Vernon 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 Mount Vernon
- 57363