Alton, Indiana Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Alton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°60°—
- FridayJun 5Overcast——84°63°-1°
- SaturdayJun 6Light Drizzle——86°63°+2°
- SundayJun 7Light Showers35%—86°68°0°
- MondayJun 8Showers42%—84°69°-2°
- TuesdayJun 9Heavy Drizzle36%0.17″75°69°-9°
- WednesdayJun 10Light Drizzle23%—77°69°+2°
Ozone at AQI 33 now. AQI down 12 over the last 6 hours (steady decline since this morning). With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 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 33 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 by mid-afternoon.
- Present
- AQI 33
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 15
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
- 4:08 AM
- Moonset
- 1:53 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Alton at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 5 (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.