Gaithersburg, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Gaithersburg weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Heavy Rain48%0.96″94°71°—
- MondayJul 6Heavy Rain44%0.74″84°73°-10°
- TuesdayJul 7Light Drizzle56%0.03″74°67°-10°
- WednesdayJul 8Light Drizzle41%0.03″73°65°-1°
- ThursdayJul 9Drizzle61%0.02″91°68°+18°
- FridayJul 10Light Showers43%0.04″84°69°-7°
- SaturdayJul 11Overcast22%—83°67°-1°
AQI 103 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 54 in the last 6 hours — air quality is degrading. Ozone at AQI 95 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 95 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 95
- UV peak
- 1.1 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 95
PM × Wind × Precip
PM2.5 at 11.6 µg/m³, PM10 at 12.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 11:25 PM
- Moonset
- 11:19 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Gaithersburg at a glance
- Today vs. normal: 20°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 codes: 20877, 20878, 20879, 20882, 20899
16-Day Forecast — Gaithersburg
- Sun95°71°48%
- Mon84°73°44%
- Tue74°67°56%
- Wed73°65°41%
- Thu91°68°61%
- Fri84°69°43%
- Sat83°67°22%
- Sun80°68°24%
- Mon87°66°24%
- Tue72°61°16%
- Wed76°61°15%
- Thu81°63°22%
- Fri86°65°29%
- Sat86°65°29%
- Sun80°68°26%
- Mon79°67°26%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Gaithersburg
Right now in the garden
Peak growing season
As of July 5, 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 — Gaithersburg
SPC has placed Gaithersburg in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
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 Gaithersburg
- 20878
- 20899
- 20879
- 20877
- 20884
- 20885
- 20898