Fort Thompson, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Fort Thompson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast15%—90°62°—
- SundayJul 5Clear——93°67°+3°
- MondayJul 6Drizzle49%0.02″102°69°+9°
- TuesdayJul 7Showers54%0.19″102°69°0°
- WednesdayJul 8Overcast59%—83°68°-19°
- ThursdayJul 9Light Showers13%0.13″85°65°+2°
- FridayJul 10Clear16%—81°63°-4°
AQI 55 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 23.6 µg/m³ (AQI 78) with a 0.69 fine-to-coarse ratio and 5 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 46 now. With UV 7.6 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 33 around 1 PM.
- Present
- AQI 46
- UV peak
- 7.6 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 33
PM × Wind × Precip
PM2.5 at 23.6 µg/m³ (AQI 78) with a 0.69 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.69
- 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
- 11:39 PM
- Moonset
- 10:40 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Fort Thompson at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 10 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57339
16-Day Forecast — Fort Thompson
- Sat90°62°15%
- Sun93°67°1%
- Mon102°69°49%
- Tue102°69°54%
- Wed83°68°59%
- Thu85°65°13%
- Fri81°63°16%
- Sat84°59°16%
- Sun90°63°8%
- Mon92°67°5%
- Tue98°66°9%
- Wed105°71°15%
- Thu92°77°13%
- Fri87°69°20%
- Sat86°63°12%
- Sun90°60°18%
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 — Fort Thompson
SPC includes Fort Thompson in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
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 Fort Thompson
- 57339