Gann Valley, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Gann Valley weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast14%—86°62°—
- SundayJul 5Clear——89°65°+3°
- MondayJul 6Overcast43%—98°68°+9°
- TuesdayJul 7Heavy Showers45%0.36″100°69°+2°
- WednesdayJul 8Overcast60%—83°67°-17°
- ThursdayJul 9Showers17%0.27″83°64°0°
- FridayJul 10Mostly Clear17%—80°61°-3°
AQI 54 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 18.2 µg/m³ (AQI 68) with a 0.70 fine-to-coarse ratio and 4 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 7.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 46 around 1 PM.
- Present
- AQI 49
- UV peak
- 7.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 46
PM × Wind × Precip
PM2.5 at 18.2 µg/m³ (AQI 68) with a 0.70 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.70
- 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
- 11:38 PM
- Moonset
- 10:38 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Gann Valley at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: May 10 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57341
16-Day Forecast — Gann Valley
- Sat86°62°14%
- Sun89°65°1%
- Mon98°68°43%
- Tue100°69°45%
- Wed83°67°60%
- Thu83°64°17%
- Fri80°61°17%
- Sat82°57°14%
- Sun88°63°7%
- Mon89°65°5%
- Tue95°65°9%
- Wed103°71°13%
- Thu91°75°17%
- Fri85°67°24%
- Sat84°60°12%
- Sun88°58°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 — Gann Valley
SPC includes Gann Valley in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Gann Valley
- 57341