Ashton-Sandy Spring, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Ashton-Sandy Spring weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast32%—100°77°—
- SundayJul 5Overcast49%—95°74°-5°
- MondayJul 6Light Showers75%—83°72°-12°
- TuesdayJul 7Thunderstorm75%0.30″87°69°+4°
- WednesdayJul 8Rain37%0.18″77°68°-10°
- ThursdayJul 9Overcast12%—89°67°+12°
- FridayJul 10Light Drizzle43%0.02″89°71°0°
AQI 88 (Moderate), driven by Ozone. AQI up 37 in the last 6 hours — air quality is degrading. Ozone at AQI 55. 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 55. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 55
- UV peak
- 0.4 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 9.6 µg/m³, PM10 at 10.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- Wind
- breezy
- 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
- 11:00 PM
- Moonset
- 10:12 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Ashton-Sandy Spring at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Ashton-Sandy Spring
- Sat100°77°32%
- Sun95°74°49%
- Mon83°72°75%
- Tue87°69°75%
- Wed77°68°37%
- Thu89°67°12%
- Fri89°71°43%
- Sat88°69°35%
- Sun80°67°22%
- Mon81°69°21%
- Tue85°65°16%
- Wed88°67°33%
- Thu91°70°37%
- Fri87°72°42%
- Sat88°70°44%
- Sun86°70°46%
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 — Ashton-Sandy Spring
SPC has placed Ashton-Sandy Spring 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 Ashton-Sandy Spring
- 20861
- 20860
- 20862
- 20905