Arnold, Maryland Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
Arnold weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast28%—82°68°—
- TuesdayJun 16Overcast——80°60°-2°
- WednesdayJun 17Overcast15%—84°67°+4°
- ThursdayJun 18Light Drizzle42%—93°72°+9°
- FridayJun 19Drizzle42%—84°71°-9°
- SaturdayJun 20Overcast13%—79°62°-5°
- SundayJun 21Overcast——78°62°-1°
AQI 37 (Good), driven by Ozone. AQI down 7 over the last 6 hours (gradual decline). Ozone at AQI 42 now. With UV 7.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 31 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 42 now. With UV 7.9 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 31 around 1 PM.
- Present
- AQI 42
- UV peak
- 7.9 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 31
PM × Wind × Precip
PM2.5 at 4.5 µg/m³, PM10 at 4.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:41 AM
- Moonset
- 8:46 PM
- In sign
- ♋︎ Cancer
Solstice approaches — longest light
Arnold at a glance
- Today vs. normal: 75°F — typical for the season
- Last frost: April 10 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Arnold
- Mon82°68°28%
- Tue80°60°1%
- Wed84°67°15%
- Thu93°72°42%
- Fri84°71°42%
- Sat79°62°13%
- Sun78°62°7%
- Mon69°63°30%
- Tue79°60°30%
- Wed77°63°13%
- Thu80°61°13%
- Fri80°62°28%
- Sat86°66°28%
- Sun90°71°18%
- Mon98°74°38%
- Tue96°71°38%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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.
ZIP codes in Arnold
- 21012