Herndon, Virginia Weather
Honeysuckle sweetens the night. Day 89 of spring. Read this microseason across nine climate regions →
Herndon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Light Drizzle—0.01″79°54°—
- WednesdayJun 17Overcast——89°63°+10°
- ThursdayJun 18Overcast19%—94°73°+5°
- FridayJun 19Overcast38%—85°66°-9°
- SaturdayJun 20Overcast——79°61°-6°
- SundayJun 21Overcast14%—79°59°0°
- MondayJun 22Light Drizzle55%0.02″73°61°-6°
AQI 75 (Moderate), driven by PM2.5. AQI up 32 in the last 6 hours — air quality is degrading. PM2.5 at 9.5 µg/m³, PM10 at 11.0 µg/m³ — typical background levels with no transport signature.
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 48 now. With UV 0.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 48
- UV peak
- 0.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 9.5 µg/m³, PM10 at 11.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.86
- Wind
- calm
- 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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 6:55 AM
- Moonset
- 9:51 PM
- In sign
- ♋︎ Cancer
Honeysuckle sweetens the night
Herndon at a glance
- Today vs. normal: 75°F — typical for the season
- Last frost: April 10 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
Right now in the garden
Peak growing season
As of June 16, 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 — Herndon
SPC has placed Herndon in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3SLGTSlight Risk
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 Herndon
- 20170
- 20172
- 22095