St. Marys, Kansas Weather
Heat settles and the rain begins. Day 90 of spring. Read this microseason across nine climate regions →
St. Marys weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Light Drizzle45%0.02″79°63°—
- WednesdayJun 17Clear——93°69°+14°
- ThursdayJun 18Overcast10%—78°62°-15°
- FridayJun 19Overcast——79°58°+1°
- SaturdayJun 20Showers64%—84°63°+5°
- SundayJun 21Heavy Showers72%1.7″75°66°-9°
- MondayJun 22Overcast31%—71°61°-4°
AQI 43 (Good), driven by PM2.5. AQI up 10 over the last 6 hours (gradual rise). PM2.5 at 7.9 µg/m³, PM10 at 9.5 µg/m³ — typical background levels with no transport signature.
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 41 now. With UV 0.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 41
- UV peak
- 0.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 7.9 µg/m³, PM10 at 9.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.83
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 8:29 AM
- Moonset
- 11:00 PM
- In sign
- ♋︎ Cancer
Heat settles and the rain begins
St. Marys at a glance
- Today vs. normal: 77°F — typical for the season
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — St. Marys
- Tue79°63°45%
- Wed93°69°2%
- Thu78°62°10%
- Fri79°58°7%
- Sat84°63°64%
- Sun75°66°72%
- Mon71°61°31%
- Tue77°64°19%
- Wed82°61°16%
- Thu85°65°24%
- Fri88°75°29%
- Sat90°76°21%
- Sun87°71°26%
- Mon90°72°45%
- Tue87°67°32%
- Wed87°68°23%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 17, 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. Marys
SPC has placed St. Marys in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3NONENo severe risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
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. Marys
- 66536