Henderson, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Henderson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle26%0.02″104°81°—
- SundayJul 5Heavy Showers35%0.80″97°78°-7°
- MondayJul 6Thunderstorm71%0.03″87°73°-10°
- TuesdayJul 7Light Showers70%—91°70°+4°
- WednesdayJul 8Drizzle32%0.04″80°68°-11°
- ThursdayJul 9Mostly Clear11%—91°68°+11°
- FridayJul 10Overcast34%—95°72°+4°
AQI 93 (Moderate), driven by Ozone. AQI up 42 in the last 6 hours — air quality is degrading. Ozone at AQI 93 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
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 93 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 93
- UV peak
- 2.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 93
PM × Wind × Precip
PM2.5 at 7.3 µg/m³, PM10 at 7.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.92
- Wind
- light
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:55 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Henderson at a glance
- Today vs. normal: 28°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 code: 21640
16-Day Forecast — Henderson
- Sat104°81°26%
- Sun97°78°35%
- Mon87°73°71%
- Tue91°70°70%
- Wed80°68°32%
- Thu91°68°11%
- Fri95°72°34%
- Sat94°73°34%
- Sun85°70°25%
- Mon80°68°18%
- Tue88°66°17%
- Wed93°69°34%
- Thu94°71°35%
- Fri94°74°32%
- Sat93°71°35%
- Sun93°74°43%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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.
SPC Convective Outlook
Storm Prediction Center — Henderson
SPC has placed Henderson 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 Henderson
- 21640
- 21649