Cabin John, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Cabin John weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain28%0.12″101°76°—
- SundayJul 5Light Rain41%0.21″98°73°-3°
- MondayJul 6Light Drizzle78%0.02″86°74°-12°
- TuesdayJul 7Thunderstorm78%0.58″90°72°+4°
- WednesdayJul 8Light Rain38%0.11″77°70°-13°
- ThursdayJul 9Overcast11%—93°68°+16°
- FridayJul 10Drizzle44%0.07″92°74°-1°
AQI 110 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 54 in the last 6 hours — air quality is degrading. Ozone at AQI 85 — 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 85 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 85
- UV peak
- 2.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 85
PM × Wind × Precip
PM2.5 at 8.8 µg/m³, PM10 at 9.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- light
- 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
- 11:00 PM
- Moonset
- 10:13 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Cabin John at a glance
- Today vs. normal: 27°F above the seasonal normal for this latitude
- Last frost: April 10 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 20818
16-Day Forecast — Cabin John
- Sat101°76°28%
- Sun98°73°41%
- Mon86°74°78%
- Tue90°72°78%
- Wed77°70°38%
- Thu93°68°11%
- Fri92°74°44%
- Sat92°70°38%
- Sun83°71°24%
- Mon83°70°20%
- Tue89°67°18%
- Wed94°70°33%
- Thu95°72°37%
- Fri89°76°42%
- Sat95°74°44%
- Sun90°71°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 — Cabin John
SPC has placed Cabin John 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 Cabin John
- 20818
- 20817