San Mar, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
San Mar weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Rain37%0.07″100°76°—
- SundayJul 5Heavy Rain42%1.5″94°75°-6°
- MondayJul 6Light Showers79%0.10″82°70°-12°
- TuesdayJul 7Thunderstorm79%1.1″87°65°+5°
- WednesdayJul 8Drizzle29%0.01″78°64°-9°
- ThursdayJul 9Overcast11%—92°64°+14°
- FridayJul 10Light Drizzle40%—88°67°-4°
AQI 85 (Moderate), driven by Ozone. AQI up 33 in the last 6 hours — air quality is degrading. Ozone at AQI 80 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
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 80 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 80
- UV peak
- 2.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 80
PM × Wind × Precip
PM2.5 at 8.1 µg/m³ (AQI 45) with a 0.90 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.90
- Wind
- light
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:03 PM
- Moonset
- 10:14 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
San Mar at a glance
- Today vs. normal: 28°F above the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — San Mar
- Sat100°76°37%
- Sun94°75°42%
- Mon82°70°79%
- Tue87°65°79%
- Wed78°64°29%
- Thu92°64°11%
- Fri88°67°40%
- Sat89°67°29%
- Sun79°63°23%
- Mon81°63°16%
- Tue84°59°16%
- Wed89°61°40%
- Thu93°64°42%
- Fri84°67°38%
- Sat92°68°34%
- Sun85°69°44%
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 — San Mar
SPC has placed San Mar in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
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 San Mar
- 21713