Le Mars, Iowa Weather
Prairie lightning bugs rise. Day 77 of spring. Read this microseason across nine climate regions →
Le Mars weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast29%—82°68°—
- FridayJun 5Overcast16%—88°64°+6°
- SaturdayJun 6Overcast16%—86°65°-2°
- SundayJun 7Light Showers45%0.01″81°68°-5°
- MondayJun 8Thunderstorm35%—87°65°+6°
- TuesdayJun 9Thunderstorm19%—90°73°+3°
- WednesdayJun 10Thunderstorm14%—92°76°+2°
Ozone at AQI 34. AQI flat over the last 6 hours (within ±3 points). Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 34
- UV peak
- 2.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 5
PM × Wind × Precip
PM2.5 at 5.5 µg/m³, PM10 at 5.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- Wind
- breezy
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:03 AM
- Moonset
- 2:18 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Le Mars at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: May 3 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 — Le Mars
SPC has placed Le Mars in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYMRGLMarginal Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.