Severn, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Severn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle23%0.01″101°78°—
- SundayJul 5Rain45%0.27″95°74°-6°
- MondayJul 6Heavy Drizzle75%—82°74°-13°
- TuesdayJul 7Thunderstorm75%0.07″89°72°+7°
- WednesdayJul 8Heavy Showers35%0.41″79°69°-10°
- ThursdayJul 9Overcast13%—93°70°+14°
- FridayJul 10Light Drizzle41%0.02″94°75°+1°
AQI 112 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 58 in the last 6 hours — air quality is degrading. Ozone at AQI 100 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 100 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 100
- UV peak
- 2.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 100
PM × Wind × Precip
PM2.5 at 8.6 µg/m³, PM10 at 9.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- Wind
- calm
- Recent rain
- 1h 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:59 PM
- Moonset
- 10:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Severn at a glance
- Today vs. normal: 28°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 21144
16-Day Forecast — Severn
- Sat101°78°23%
- Sun95°74°45%
- Mon82°74°75%
- Tue89°72°75%
- Wed79°69°35%
- Thu93°70°13%
- Fri94°75°41%
- Sat91°72°34%
- Sun83°73°21%
- Mon80°72°19%
- Tue89°69°18%
- Wed93°73°40%
- Thu94°74°42%
- Fri94°74°35%
- Sat92°72°35%
- Sun93°75°39%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Severn
Right now in the garden
Peak growing season
As of July 4, 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 — Severn
SPC has placed Severn in the Enhanced Risk category for severe thunderstorms today.
- TODAYENHEnhanced Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
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 Severn
- 21144
- 21077
- 21076