Ashburn, Virginia Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Ashburn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast39%—99°76°—
- SundayJul 5Showers39%0.10″96°72°-3°
- MondayJul 6Showers85%0.71″92°73°-4°
- TuesdayJul 7Light Showers85%0.05″79°69°-13°
- WednesdayJul 8Light Drizzle45%0.01″76°68°-3°
- ThursdayJul 9Overcast31%—95°67°+19°
- FridayJul 10Light Drizzle54%—97°72°+2°
AQI 48 (Good), driven by PM2.5. AQI down 37 over the last 6 hours — air quality is improving sharply. PM2.5 at 11.0 µg/m³ (AQI 55) with a 0.96 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
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 31 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 5 around 1 PM.
- Present
- AQI 31
- UV peak
- 0.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 5
PM × Wind × Precip
PM2.5 at 11.0 µg/m³ (AQI 55) with a 0.96 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.96
- Wind
- calm
- 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
- 11:26 PM
- Moonset
- 11:20 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Ashburn at a glance
- Today vs. normal: 3°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 codes: 20147, 20148
16-Day Forecast — Ashburn
- Sat99°76°39%
- Sun96°72°39%
- Mon92°73°85%
- Tue79°69°85%
- Wed76°68°45%
- Thu95°67°31%
- Fri97°72°54%
- Sat83°69°31%
- Sun80°65°18%
- Mon85°58°17%
- Tue90°61°11%
- Wed89°65°23%
- Thu89°63°29%
- Fri92°67°27%
- Sat92°70°30%
- Sun88°69°36%
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 — Ashburn
SPC has placed Ashburn in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYMRGLMarginal 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 Ashburn
- 20166
- 20147
- 20103
- 20104
- 20146
- 20149