Preston, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Preston weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast18%—100°81°—
- SundayJul 5Overcast23%—97°77°-3°
- MondayJul 6Heavy Showers71%1.5″92°72°-5°
- TuesdayJul 7Drizzle70%—88°70°-4°
- WednesdayJul 8Heavy Drizzle35%—79°69°-9°
- ThursdayJul 9Overcast——91°68°+12°
- FridayJul 10Overcast36%—97°73°+6°
AQI 140 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 87 in the last 6 hours — air quality is degrading. Ozone at AQI 98. Overcast through the UV peak window (cloud cover ~63%) — 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 98. Overcast through the UV peak window (cloud cover ~63%) — afternoon ozone should stay flat.
- Present
- AQI 98
- UV peak
- 0.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 12
PM × Wind × Precip
PM2.5 at 9.8 µg/m³, PM10 at 10.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- 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
- 10:55 PM
- Moonset
- 10:08 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Preston at a glance
- Today vs. normal: 24°F above the seasonal normal for this latitude
- Last frost: April 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 21655
16-Day Forecast — Preston
- Sat100°81°18%
- Sun97°77°23%
- Mon92°72°71%
- Tue88°70°70%
- Wed79°69°35%
- Thu91°68°9%
- Fri97°73°36%
- Sat93°75°36%
- Sun85°72°24%
- Mon80°68°18%
- Tue88°67°15%
- Wed93°71°41%
- Thu90°72°41%
- Fri93°71°39%
- Sat96°71°33%
- Sun93°76°45%
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 — Preston
SPC has placed Preston 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 Preston
- 21655