Vienna, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Vienna weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast20%—102°80°—
- SundayJul 5Overcast14%—98°77°-4°
- MondayJul 6Thunderstorm76%—93°74°-5°
- TuesdayJul 7Thunderstorm76%—85°69°-8°
- WednesdayJul 8Light Drizzle36%—80°66°-5°
- ThursdayJul 9Overcast——92°66°+12°
- FridayJul 10Light Rain37%0.15″99°74°+7°
AQI 154 (Unhealthy), driven by Ozone. AQI up 52 in the last 6 hours — air quality is degrading. Ozone at AQI 138. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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 138. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 138
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 17
PM × Wind × Precip
PM2.5 at 16.2 µg/m³, PM10 at 18.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.86
- Wind
- breezy
- 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
- 11:19 PM
- Moonset
- 11:13 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Vienna at a glance
- Today vs. normal: 16°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: 21869
16-Day Forecast — Vienna
- Sat102°80°20%
- Sun98°77°14%
- Mon93°74°76%
- Tue85°69°76%
- Wed80°66°36%
- Thu92°66°8%
- Fri99°74°37%
- Sat83°70°37%
- Sun81°68°26%
- Mon85°64°20%
- Tue88°63°15%
- Wed93°67°41%
- Thu91°71°41%
- Fri92°70°39%
- Sat87°71°33%
- Sun94°70°45%
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 — Vienna
SPC has placed Vienna 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 Vienna
- 21869