Union Star, Missouri Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
Union Star weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——79°55°—
- TuesdayJun 16Overcast20%—79°62°0°
- WednesdayJun 17Thunderstorm35%—90°64°+11°
- ThursdayJun 18Overcast——74°56°-16°
- FridayJun 19Mostly Clear——77°52°+3°
- SaturdayJun 20Showers43%0.73″75°62°-2°
- SundayJun 21Rain61%0.49″77°64°+2°
AQI 45 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.6 µg/m³ (AQI 56) with a 0.97 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 11.6 µg/m³ (AQI 56) with a 0.97 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.97
- 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
- 5:52 AM
- Moonset
- 9:06 PM
- In sign
- ♊︎ Gemini
Sun climbs to its northern throne
Union Star at a glance
- Today vs. normal: 19°F below the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Union Star
- Mon79°55°1%
- Tue79°62°20%
- Wed90°64°35%
- Thu74°56°9%
- Fri77°52°4%
- Sat75°62°43%
- Sun77°64°61%
- Mon70°61°43%
- Tue76°65°7%
- Wed83°63°15%
- Thu88°71°12%
- Fri89°72°19%
- Sat90°74°29%
- Sun90°75°29%
- Mon84°71°32%
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 — Union Star
SPC has placed Union Star in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- 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 Union Star
- 64494