Lyons, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Lyons weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——87°66°—
- SundayJul 5Overcast——88°66°+1°
- MondayJul 6Overcast——88°66°0°
- TuesdayJul 7Light Drizzle25%—90°67°+2°
- WednesdayJul 8Light Showers46%—84°69°-6°
- ThursdayJul 9Overcast23%—81°61°-3°
- FridayJul 10Drizzle11%0.01″87°64°+6°
AQI 45 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.5 µg/m³ (AQI 54) with a 0.77 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 45 now. With UV 5.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 34 around 1 PM.
- Present
- AQI 45
- UV peak
- 5.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 34
PM × Wind × Precip
PM2.5 at 10.5 µg/m³ (AQI 54) with a 0.77 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.77
- 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
- 11:28 PM
- Moonset
- 10:30 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Lyons at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: May 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57041
16-Day Forecast — Lyons
- Sat87°66°6%
- Sun88°66°4%
- Mon88°66°5%
- Tue90°67°25%
- Wed84°69°46%
- Thu81°61°23%
- Fri87°64°11%
- Sat83°59°11%
- Sun78°54°11%
- Mon87°56°6%
- Tue94°67°5%
- Wed85°63°10%
- Thu90°61°9%
- Fri93°68°16%
- Sat94°67°17%
- Sun99°71°25%
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 — Lyons
SPC has placed Lyons in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
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 Lyons
- 57041