Mechanicsville, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Mechanicsville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle39%0.01″101°80°—
- SundayJul 5Light Drizzle21%0.02″98°76°-3°
- MondayJul 6T-storm w/ Hail75%0.03″89°73°-9°
- TuesdayJul 7Light Showers75%—84°68°-5°
- WednesdayJul 8Showers37%0.07″77°69°-7°
- ThursdayJul 9Partly Cloudy13%—94°67°+17°
- FridayJul 10Overcast34%—99°71°+5°
AQI 111 (Unhealthy for Sensitive Groups), driven by PM2.5. AQI up 59 in the last 6 hours — air quality is degrading. PM2.5 at 9.4 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 50. Overcast through the UV peak window (cloud cover ~94%) — afternoon ozone should stay flat.
- Present
- AQI 50
- UV peak
- 0.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 9.4 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- breezy
- 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
- 10:58 PM
- Moonset
- 10:12 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Mechanicsville at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 20659
16-Day Forecast — Mechanicsville
- Sat101°80°39%
- Sun98°76°21%
- Mon89°73°75%
- Tue84°68°75%
- Wed77°69°37%
- Thu94°67°13%
- Fri99°71°34%
- Sat96°70°39%
- Sun83°69°30%
- Mon80°66°24%
- Tue88°65°15%
- Wed91°67°41%
- Thu90°68°43%
- Fri94°70°43%
- Sat97°70°39%
- Sun92°71°37%
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 — Mechanicsville
SPC has placed Mechanicsville in the Enhanced Risk category for severe thunderstorms today.
- TODAYENHEnhanced Risk
- TOMORROWSLGTSlight Risk
- DAY 3MRGLMarginal Risk
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 Mechanicsville
- 20659