Watertown, South Dakota Weather
Prairie lightning bugs rise. Day 78 of spring. Read this microseason across nine climate regions →
Watertown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Thunderstorm69%0.13″77°63°—
- FridayJun 5Drizzle47%0.07″78°63°+1°
- SaturdayJun 6Clear——82°57°+4°
- SundayJun 7Thunderstorm20%—88°64°+6°
- MondayJun 8Light Showers40%—87°66°-1°
- TuesdayJun 9Thunderstorm16%—88°68°+1°
- WednesdayJun 10Thunderstorm21%—97°71°+9°
Ozone at AQI 41 now. AQI up 7 over the last 6 hours (gradual rise). With UV 0.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 7 by mid-afternoon.
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 41 now. With UV 0.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 7 by mid-afternoon.
- Present
- AQI 41
- UV peak
- 0.1 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 7
PM × Wind × Precip
PM scrubbed by 3 hours of recent rain — PM2.5 down to 6.5 µg/m³, PM10 to 8.2 µg/m³.
- PM2.5/PM10
- 0.79
- Wind
- breezy
- Recent rain
- 3h in last 6h
- Pattern
- washed out
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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:44 AM
- Moonset
- 3:24 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Watertown at a glance
- Today vs. normal: 70°F — typical for the season
- Last frost: May 15 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 5, 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 — Watertown
SPC has placed Watertown in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.