Antietam, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Antietam weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast29%—102°77°—
- SundayJul 5Heavy Showers47%0.41″95°76°-7°
- MondayJul 6Thunderstorm83%—81°71°-14°
- TuesdayJul 7Heavy Showers83%2.4″88°65°+7°
- WednesdayJul 8Light Drizzle27%0.01″80°65°-8°
- ThursdayJul 9Overcast12%—93°65°+13°
- FridayJul 10Light Drizzle36%—89°68°-4°
AQI 85 (Moderate), driven by Ozone. AQI up 33 in the last 6 hours — air quality is degrading. Ozone at AQI 80 — 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 80 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 80
- UV peak
- 2.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 80
PM × Wind × Precip
PM2.5 at 8.1 µg/m³, PM10 at 9.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- Wind
- light
- Recent rain
- 0h 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
- 11:03 PM
- Moonset
- 10:15 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Antietam at a glance
- Today vs. normal: 29°F above the seasonal normal for this latitude
- Last frost: April 12 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Antietam
- Sat102°77°29%
- Sun95°76°47%
- Mon81°71°83%
- Tue88°65°83%
- Wed80°65°27%
- Thu93°65°12%
- Fri89°68°36%
- Sat89°68°30%
- Sun80°64°22%
- Mon81°64°17%
- Tue86°60°16%
- Wed86°61°40%
- Thu94°66°42%
- Fri84°69°38%
- Sat93°69°34%
- Sun88°69°44%
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 — Antietam
SPC has placed Antietam in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight 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 Antietam
- 21782