Allen, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Allen weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast12%—101°81°—
- SundayJul 5Overcast——98°79°-3°
- MondayJul 6Showers78%—92°76°-6°
- TuesdayJul 7Thunderstorm78%—90°70°-2°
- WednesdayJul 8Light Drizzle39%—80°68°-10°
- ThursdayJul 9Overcast——91°67°+11°
- FridayJul 10Overcast32%—98°75°+7°
AQI 103 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 43 in the last 6 hours — air quality is degrading. Ozone at AQI 100. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 100. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 100
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 12
PM × Wind × Precip
PM2.5 at 13.9 µg/m³, PM10 at 15.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.88
- 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
- 11:18 PM
- Moonset
- 11:13 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Allen at a glance
- Today vs. normal: 18°F above the seasonal normal for this latitude
- Last frost: April 6 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 21810
16-Day Forecast — Allen
- Sat101°80°12%
- Sun98°77°9%
- Mon92°76°78%
- Tue90°70°78%
- Wed80°68°39%
- Thu91°67°9%
- Fri98°75°32%
- Sat81°71°33%
- Sun82°69°26%
- Mon85°64°25%
- Tue86°64°16%
- Wed90°68°42%
- Thu91°71°43%
- Fri90°71°39%
- Sat86°71°32%
- Sun94°71°38%
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 — Allen
SPC has placed Allen 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 Allen
- 21810