Letts, Iowa Weather
Prairie lightning bugs rise. Day 77 of spring. Read this microseason across nine climate regions →
Letts weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——88°58°—
- FridayJun 5Thunderstorm60%0.44″85°70°-3°
- SaturdayJun 6Light Showers71%—83°70°-2°
- SundayJun 7Showers52%—83°70°0°
- MondayJun 8Showers59%0.14″86°69°+3°
- TuesdayJun 9Thunderstorm40%—86°72°0°
- WednesdayJun 10Thunderstorm19%—91°74°+5°
Ozone at AQI 78 — peak already passed at 1 PM under clear skies. AQI up 12 over the last 6 hours (gradual rise). Levels should ease through evening.
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 78 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 78
- UV peak
- 5.7 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 78
PM × Wind × Precip
PM2.5/PM10 ratio 0.68 with 13 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.68
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
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
- 4:39 AM
- Moonset
- 2:03 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Letts at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: April 24 (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 — Letts
SPC has placed Letts in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- 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.