White Marsh, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
White Marsh weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast21%—102°81°—
- SundayJul 5Light Drizzle48%0.02″94°75°-8°
- MondayJul 6Light Showers85%0.06″83°72°-11°
- TuesdayJul 7Thunderstorm81%0.01″89°71°+6°
- WednesdayJul 8Drizzle34%0.05″78°66°-11°
- ThursdayJul 9Overcast12%—91°68°+13°
- FridayJul 10Overcast43%—93°72°+2°
AQI 167 (Unhealthy), driven by Ozone. AQI up 107 in the last 6 hours — air quality is degrading. Ozone at AQI 133 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
LIMIT OUTDOORS Limit prolonged outdoor exertion. Sensitive groups should avoid outdoor exertion. Consider rescheduling outdoor activities until AQI improves.
What's driving it
Ozone × UV × Sky
Ozone at AQI 133 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 133
- UV peak
- 1.8 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 133
PM × Wind × Precip
PM2.5 at 11.1 µg/m³, PM10 at 12.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.92
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:58 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
White Marsh at a glance
- Today vs. normal: 27°F above the seasonal normal for this latitude
- Last frost: April 12 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 21162
16-Day Forecast — White Marsh
- Sat102°81°21%
- Sun94°75°48%
- Mon83°72°85%
- Tue89°71°81%
- Wed78°66°34%
- Thu91°68°12%
- Fri93°72°43%
- Sat91°71°35%
- Sun83°67°26%
- Mon75°66°17%
- Tue87°63°17%
- Wed90°65°37%
- Thu92°70°45%
- Fri91°73°46%
- Sat94°72°40%
- Sun92°73°46%
Forecast data from Open-Meteo (CC BY 4.0).
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 — White Marsh
SPC has placed White Marsh 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 White Marsh
- 21128
- 21237
- 21236
- 21162