Castana, Iowa Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Castana weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——84°59°—
- ThursdayJun 4Heavy Rain49%0.82″78°64°-6°
- FridayJun 5Thunderstorm42%—88°67°+10°
- SaturdayJun 6Overcast42%—85°63°-3°
- SundayJun 7Light Showers37%—84°68°-1°
- MondayJun 8Light Drizzle33%—82°67°-2°
- TuesdayJun 9Thunderstorm15%—84°67°+2°
Ozone at AQI 86 now. AQI up 15 in the last 6 hours — air quality is degrading. With UV 8.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 99 by mid-afternoon.
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 86 now. With UV 8.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 99 by mid-afternoon.
- Present
- AQI 86
- UV peak
- 8.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 99
PM × Wind × Precip
PM2.5 at 7.0 µg/m³, PM10 at 8.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.83
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:24 AM
- Moonset
- 1:15 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Castana at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 28 (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 3, 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 — Castana
SPC has placed Castana in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3SLGTSlight Risk
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.