Fairfax, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Fairfax weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——87°64°—
- SundayJul 5Clear——87°65°0°
- MondayJul 6Overcast15%—95°67°+8°
- TuesdayJul 7Heavy Drizzle29%—97°71°+2°
- WednesdayJul 8Drizzle58%—80°68°-17°
- ThursdayJul 9Heavy Drizzle23%0.06″89°63°+9°
- FridayJul 10Overcast23%—82°62°-7°
AQI 59 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 22.4 µg/m³ (AQI 76) with a 0.67 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 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 47 around 1 PM.
- Present
- AQI 45
- UV peak
- 7.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 47
PM × Wind × Precip
PM2.5 at 22.4 µg/m³ (AQI 76) with a 0.67 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.67
- 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
- 11:36 PM
- Moonset
- 10:39 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Fairfax at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: May 4 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 57335
16-Day Forecast — Fairfax
- Sat87°64°8%
- Sun87°65°4%
- Mon95°67°15%
- Tue97°71°29%
- Wed80°68°58%
- Thu89°63°23%
- Fri82°62°23%
- Sat82°58°13%
- Sun87°64°8%
- Mon88°63°5%
- Tue95°63°8%
- Wed102°74°9%
- Thu89°72°15%
- Fri90°66°20%
- Sat84°61°25%
- Sun87°57°30%
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 — Fairfax
SPC has placed Fairfax 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 Fairfax
- 57335