Herndon, Pennsylvania Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Herndon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——87°55°—
- FridayJun 5Overcast——90°62°+3°
- SaturdayJun 6Light Showers41%—84°61°-6°
- SundayJun 7Showers41%—84°62°0°
- MondayJun 8Light Drizzle——72°59°-12°
- TuesdayJun 9Overcast——81°55°+9°
- WednesdayJun 10Mostly Clear13%—84°56°+3°
AQI 22 (Good), driven by Ozone. AQI down 13 over the last 6 hours (steady decline since this morning).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:38 AM
- Moonset
- 1:05 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Herndon at a glance
- Today vs. normal: 16°F below the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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.