Seneca, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Seneca weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——88°62°—
- SundayJul 5Mostly Clear——89°63°+1°
- MondayJul 6Heavy Drizzle58%—100°67°+11°
- TuesdayJul 7Thunderstorm69%0.41″95°63°-5°
- WednesdayJul 8Light Showers69%—83°62°-12°
- ThursdayJul 9Drizzle15%0.04″74°61°-9°
- FridayJul 10Partly Cloudy15%—76°60°+2°
AQI 54 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 14.3 µg/m³ (AQI 61) with a 0.80 fine-to-coarse ratio and 6 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 14.3 µg/m³ (AQI 61) with a 0.80 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- light
- 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
- 11:41 PM
- Moonset
- 10:39 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Seneca at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57473
16-Day Forecast — Seneca
- Sat88°62°7%
- Sun89°63°1%
- Mon100°67°58%
- Tue95°63°69%
- Wed83°62°69%
- Thu74°61°15%
- Fri76°60°15%
- Sat80°56°15%
- Sun87°60°6%
- Mon89°64°8%
- Tue96°67°11%
- Wed101°69°11%
- Thu91°72°19%
- Fri79°64°23%
- Sat83°59°13%
- Sun88°58°19%
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 — Seneca
SPC has placed Seneca in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- 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 Seneca
- 57473