Potomac, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Potomac weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle50%0.03″101°76°—
- SundayJul 5Light Drizzle42%0.01″96°73°-5°
- MondayJul 6Heavy Showers76%0.39″90°73°-6°
- TuesdayJul 7Thunderstorm76%0.05″80°69°-10°
- WednesdayJul 8Light Drizzle37%0.02″77°67°-3°
- ThursdayJul 9Overcast11%—94°67°+17°
- FridayJul 10Light Drizzle45%—97°71°+3°
AQI 65 (Moderate), driven by PM2.5. AQI down 21 over the last 6 hours — air quality is improving sharply. PM scrubbed by 2 hours of recent rain — PM2.5 down to 13.9 µg/m³, PM10 to 14.3 µg/m³.
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 38 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 38
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 9
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 13.9 µg/m³, PM10 to 14.3 µg/m³.
- PM2.5/PM10
- 0.97
- Wind
- breezy
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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
- 11:25 PM
- Moonset
- 11:18 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Potomac at a glance
- Today vs. normal: 4°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: 20854
16-Day Forecast — Potomac
- Sat101°76°50%
- Sun96°73°42%
- Mon90°73°76%
- Tue80°69°76%
- Wed77°67°37%
- Thu94°67°11%
- Fri97°71°45%
- Sat83°68°37%
- Sun80°65°24%
- Mon85°59°20%
- Tue91°63°18%
- Wed89°65°22%
- Thu89°63°24%
- Fri91°68°33%
- Sat91°71°36%
- Sun86°69°48%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Potomac
SPC has placed Potomac 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 Potomac
- 20817
- 20854
- 20827
- 20859