Alton, Missouri Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
Alton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——80°60°—
- TuesdayJun 16Thunderstorm23%0.96″83°62°+3°
- WednesdayJun 17Thunderstorm21%—89°65°+6°
- ThursdayJun 18Light Drizzle62%—81°67°-8°
- FridayJun 19Overcast61%—83°62°+2°
- SaturdayJun 20Overcast13%—82°61°-1°
- SundayJun 21T-storm w/ Hail40%—88°68°+6°
AQI 26 (Good), driven by Ozone. AQI down 7 over the last 6 hours (gradual decline).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.
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
- 5:52 AM
- Moonset
- 8:39 PM
- In sign
- ♋︎ Cancer
Sun climbs to its northern throne
Alton at a glance
- Today vs. normal: 14°F below the seasonal normal for this latitude
- Last frost: March 27 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Alton
- Mon80°60°2%
- Tue83°62°23%
- Wed89°65°21%
- Thu81°67°62%
- Fri83°62°61%
- Sat82°61°13%
- Sun88°68°40%
- Mon82°67°54%
- Tue67°63°40%
- Wed80°60°22%
- Thu85°67°15%
- Fri92°70°29%
- Sat92°73°29%
- Sun92°71°36%
- Mon93°73°36%
- Tue92°70°29%
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 tomorrow.
- TODAYNONENo severe risk
- 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
- 65606