Allen, Maryland Weather
Fireflies rise from the lawn. Day 78 of spring. Read this microseason across nine climate regions →
Allen weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Overcast——91°61°—
- SaturdayJun 6Overcast——94°66°+3°
- SundayJun 7Overcast——91°68°-3°
- MondayJun 8Partly Cloudy——78°55°-13°
- TuesdayJun 9Overcast——80°53°+2°
- WednesdayJun 10Overcast10%—84°60°+4°
- ThursdayJun 11Overcast12%—83°64°-1°
AQI 75 (Moderate), driven by Ozone. AQI down 18 over the last 6 hours — air quality is improving sharply. Ozone at AQI 500. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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 500. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 500
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 111
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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:57 AM
- Moonset
- 2:11 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Allen at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: April 6 (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 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 General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.