Castlewood, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Castlewood weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast16%—86°61°—
- SundayJul 5Partly Cloudy——87°63°+1°
- MondayJul 6Drizzle21%0.02″89°64°+2°
- TuesdayJul 7Showers37%0.12″91°66°+2°
- WednesdayJul 8Heavy Showers70%0.48″79°65°-12°
- ThursdayJul 9Drizzle19%0.09″78°59°-1°
- FridayJul 10Light Drizzle17%—73°60°-5°
AQI 51 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.81 fine-to-coarse ratio and 3 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 5.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 35 around 1 PM.
- Present
- AQI 45
- UV peak
- 5.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 35
PM × Wind × Precip
PM2.5 at 10.2 µg/m³ (AQI 53) with a 0.81 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.81
- 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
- 11:31 PM
- Moonset
- 10:29 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Castlewood at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 14 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57223
16-Day Forecast — Castlewood
- Sat86°61°16%
- Sun87°63°1%
- Mon89°64°21%
- Tue91°66°37%
- Wed79°65°70%
- Thu78°59°19%
- Fri73°60°17%
- Sat78°58°17%
- Sun82°58°13%
- Mon85°60°9%
- Tue89°62°9%
- Wed93°64°13%
- Thu85°66°11%
- Fri78°60°13%
- Sat75°57°16%
- Sun83°55°26%
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 — Castlewood
SPC has placed Castlewood 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 Castlewood
- 57223