St. Lawrence, South Dakota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Lawrence weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——87°63°—
- SundayJul 5Clear——88°65°+1°
- MondayJul 6Thunderstorm52%0.04″96°67°+8°
- TuesdayJul 7Thunderstorm54%0.21″99°66°+3°
- WednesdayJul 8Showers64%0.07″81°64°-18°
- ThursdayJul 9Drizzle13%0.11″81°62°0°
- FridayJul 10Clear16%—79°61°-2°
AQI 52 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 14.2 µg/m³, PM10 at 18.3 µg/m³ — typical background levels with no transport signature.
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 48 now. With UV 6.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 30 around 1 PM.
- Present
- AQI 48
- UV peak
- 6.7 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 30
PM × Wind × Precip
PM2.5 at 14.2 µg/m³, PM10 at 18.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.78
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:38 PM
- Moonset
- 10:38 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
St. Lawrence at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: May 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Lawrence
- Sat87°63°9%
- Sun88°65°4%
- Mon96°67°52%
- Tue99°66°54%
- Wed81°64°64%
- Thu81°62°13%
- Fri79°61°16%
- Sat81°57°16%
- Sun87°60°7%
- Mon87°66°5%
- Tue94°66°10%
- Wed99°70°15%
- Thu89°75°14%
- Fri84°66°19%
- Sat83°61°13%
- Sun87°59°17%
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 — St. Lawrence
SPC includes St. Lawrence 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 St. Lawrence
- 57373