Olney, Maryland Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Olney weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle35%—99°78°—
- SundayJul 5Light Drizzle47%—95°74°-4°
- MondayJul 6Showers75%—82°71°-13°
- TuesdayJul 7Thunderstorm75%0.34″87°68°+5°
- WednesdayJul 8Light Showers37%0.11″77°68°-10°
- ThursdayJul 9Overcast12%—89°66°+12°
- FridayJul 10Light Drizzle44%0.04″88°70°-1°
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
Olney at a glance
- Today vs. normal: 8°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.
ZIP code: 20832
16-Day Forecast — Olney
- Sat99°78°35%
- Sun95°74°47%
- Mon82°71°75%
- Tue87°68°75%
- Wed77°68°37%
- Thu89°66°12%
- Fri88°70°44%
- Sat88°67°35%
- Sun79°65°23%
- Mon81°67°21%
- Tue84°63°17%
- Wed88°64°33%
- Thu91°67°37%
- Fri86°71°42%
- Sat88°69°44%
- Sun85°69°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 — Olney
SPC has placed Olney 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 Olney
- 20860
- 20832
- 20833
- 20853
- 20906
- 20830