Jefferson, South Dakota Weather
Lesser ripening, greater heat. Day 89 of spring. Read this microseason across nine climate regions →
Jefferson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——80°46°—
- TuesdayJun 16Overcast——78°55°-2°
- WednesdayJun 17Overcast47%—85°59°+7°
- ThursdayJun 18Light Drizzle—0.01″74°54°-11°
- FridayJun 19Light Drizzle17%—80°52°+6°
- SaturdayJun 20Light Drizzle54%0.09″76°60°-4°
- SundayJun 21Drizzle54%0.06″74°61°-2°
AQI 43 (Good), driven by Ozone. AQI up 16 in the last 6 hours — air quality is degrading. Ozone at AQI 45 now. With UV 0.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 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 45 now. With UV 0.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 45
- UV peak
- 0.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 8
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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 7:00 AM
- Moonset
- 10:26 PM
- In sign
- ♋︎ Cancer
Lesser ripening, greater heat
Jefferson at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: May 2 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Jefferson
- Mon80°46°5%
- Tue78°54°6%
- Wed85°59°47%
- Thu74°54°3%
- Fri80°52°17%
- Sat76°60°54%
- Sun74°61°54%
- Mon73°57°22%
- Tue76°55°12%
- Wed80°60°18%
- Thu86°62°18%
- Fri75°55°18%
- Sat77°58°32%
- Sun79°64°23%
- Mon77°61°23%
- Tue80°57°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 16, 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 — Jefferson
SPC has placed Jefferson in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
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 Jefferson
- 57038