Fairfax, Virginia Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Fairfax weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast41%—93°71°—
- MondayJul 6Light Rain85%0.06″90°74°-3°
- TuesdayJul 7Light Showers85%0.01″81°71°-9°
- WednesdayJul 8Light Drizzle43%0.02″77°68°-4°
- ThursdayJul 9Overcast32%—96°68°+19°
- FridayJul 10Light Drizzle51%—97°74°+1°
- SaturdayJul 11Light Drizzle35%—85°71°-12°
AQI 53 (Moderate), driven by PM2.5. AQI down 55 over the last 6 hours — air quality is improving sharply. PM2.5 at 14.7 µg/m³ (AQI 61) with a 0.97 fine-to-coarse ratio and 4 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
PM × Wind × Precip
PM2.5 at 14.7 µg/m³ (AQI 61) with a 0.97 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.97
- 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
- 11:19 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Fairfax at a glance
- Today vs. normal: 74°F — typical for the season
- Last frost: April 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 22030, 22031, 22032, 22033, 22035
15-Day Forecast — Fairfax
- Sun93°71°41%
- Mon90°74°85%
- Tue81°71°85%
- Wed77°68°43%
- Thu96°68°32%
- Fri97°74°51%
- Sat85°71°35%
- Sun80°67°20%
- Mon87°64°19%
- Tue92°65°11%
- Wed91°67°23%
- Thu90°69°29%
- Fri91°72°27%
- Sat92°71°30%
- Sun87°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 — Fairfax
SPC has placed Fairfax 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 Fairfax
- 22031
- 22030
- 22037