Ashton-Sandy Spring, Maryland Weather
Honeysuckle sweetens the night. Day 90 of spring. Read this microseason across nine climate regions →
Ashton-Sandy Spring weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 17Overcast——87°61°—
- ThursdayJun 18Overcast24%—95°69°+8°
- FridayJun 19Overcast13%—81°62°-14°
- SaturdayJun 20Overcast——80°59°-1°
- SundayJun 21Showers27%0.37″88°62°+8°
- MondayJun 22Light Rain51%0.27″77°59°-11°
- TuesdayJun 23Clear37%—80°57°+3°
AQI 43 (Good), driven by PM2.5. AQI up 8 over the last 6 hours (gradual rise). PM2.5 at 15.9 µg/m³ (AQI 64) with a 0.92 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 37 now. With UV 4.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 24 around 1 PM.
- Present
- AQI 37
- UV peak
- 4.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 24
PM × Wind × Precip
PM2.5 at 15.9 µg/m³ (AQI 64) with a 0.92 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.92
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 8:08 AM
- Moonset
- 10:41 PM
- In sign
- ♌︎ Leo
Honeysuckle sweetens the night
Ashton-Sandy Spring at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Ashton-Sandy Spring
- Wed87°61°5%
- Thu95°69°24%
- Fri81°62°13%
- Sat80°59°1%
- Sun88°62°27%
- Mon77°59°51%
- Tue80°57°37%
- Wed82°62°10%
- Thu78°66°29%
- Fri85°66°22%
- Sat89°66°25%
- Sun90°70°18%
- Mon95°71°29%
- Tue89°71°45%
- Wed81°70°45%
- Thu83°71°48%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 17, 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 Slight Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWSLGTSlight Risk
- DAY 3NONENo severe risk
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 Ashton-Sandy Spring
- 20861
- 20860
- 20862
- 20905