Alton, Iowa Weather
Toward the solstice glow. Day 88 of spring. Read this microseason across nine climate regions →
Alton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Light Rain—0.09″76°47°—
- TuesdayJun 16Overcast——75°52°-1°
- WednesdayJun 17Light Showers58%—81°56°+6°
- ThursdayJun 18Drizzle——64°51°-17°
- FridayJun 19Light Drizzle12%0.01″79°50°+15°
- SaturdayJun 20Light Drizzle39%—79°59°0°
- SundayJun 21Overcast39%—77°62°-2°
AQI 35 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.97 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.97 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.97
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 5:45 AM
- Moonset
- 9:25 PM
- In sign
- ♊︎ Gemini
Toward the solstice glow
Alton at a glance
- Today vs. normal: 24°F below the seasonal normal for this latitude
- Last frost: May 4 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Alton
- Mon76°47°3%
- Tue75°52°1%
- Wed81°56°58%
- Thu64°51°6%
- Fri79°50°12%
- Sat79°59°39%
- Sun77°62°39%
- Mon73°57°26%
- Tue77°60°16%
- Wed84°65°19%
- Thu90°67°18%
- Fri92°73°36%
- Sat95°76°29%
- Sun94°65°26%
- Mon83°61°36%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 — Alton
SPC has placed Alton in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- 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 Alton
- 51003