St. John, Indiana Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
St. John weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——73°53°—
- TuesdayJun 16Overcast82%—72°57°-1°
- WednesdayJun 17Showers88%0.33″76°52°+4°
- ThursdayJun 18Light Drizzle88%—68°56°-8°
- FridayJun 19Overcast——69°55°+1°
- SaturdayJun 20Drizzle18%0.12″66°55°-3°
- SundayJun 21Drizzle38%0.13″63°58°-3°
AQI 33 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 9.2 µg/m³ (AQI 51) with a 0.99 fine-to-coarse ratio and 4 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 9.2 µg/m³ (AQI 51) with a 0.99 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.99
- Wind
- calm
- 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
- 5:16 AM
- Moonset
- 8:42 PM
- In sign
- ♊︎ Gemini
Solstice approaches — longest light
St. John at a glance
- Today vs. normal: 20°F below the seasonal normal for this latitude
- Last frost: April 25 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — St. John
- Mon73°53°1%
- Tue72°57°82%
- Wed76°52°88%
- Thu68°56°88%
- Fri69°55°5%
- Sat66°55°18%
- Sun63°58°38%
- Mon73°55°38%
- Tue74°56°17%
- Wed78°57°12%
- Thu81°65°16%
- Fri83°64°26%
- Sat88°68°27%
- Sun90°74°33%
- Mon87°72°30%
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 — St. John
SPC has placed St. John in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- 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.
ZIP codes in St. John
- 46373
- 46311