Groton, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Groton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle——86°61°—
- SundayJul 5Clear——88°65°+2°
- MondayJul 6Thunderstorm47%1.4″97°66°+9°
- TuesdayJul 7Thunderstorm64%1.5″89°65°-8°
- WednesdayJul 8Light Showers67%—79°63°-10°
- ThursdayJul 9Light Drizzle14%0.01″74°61°-5°
- FridayJul 10Overcast18%—71°59°-3°
AQI 50 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 47 now. With UV 5.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 35 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 47 now. With UV 5.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 35 around 1 PM.
- Present
- AQI 47
- UV peak
- 5.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 35
PM × Wind × Precip
PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.80 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- 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
- 11:36 PM
- Moonset
- 10:33 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Groton at a glance
- Today vs. normal: 16°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: 57445
16-Day Forecast — Groton
- Sat86°61°9%
- Sun88°65°1%
- Mon97°66°47%
- Tue89°65°64%
- Wed79°63°67%
- Thu74°61°14%
- Fri71°59°18%
- Sat80°55°18%
- Sun84°59°10%
- Mon87°63°8%
- Tue91°64°11%
- Wed95°68°11%
- Thu89°72°17%
- Fri83°62°23%
- Sat81°59°17%
- Sun87°57°17%
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 — Groton
SPC has placed Groton 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 Groton
- 57445