Stony Brook, New York Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Stony Brook weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast42%—95°77°—
- SundayJul 5Heavy Rain43%6.3″86°70°-9°
- MondayJul 6Light Showers84%0.11″70°67°-16°
- TuesdayJul 7Drizzle81%0.13″69°63°-1°
- WednesdayJul 8Overcast26%—76°63°+7°
- ThursdayJul 9Light Drizzle——85°69°+9°
- FridayJul 10Light Drizzle40%—88°71°+3°
AQI 103 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 49 in the last 6 hours — air quality is degrading. Ozone at AQI 159 — peak already passed at 1 PM under clear 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 159 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 159
- UV peak
- 3.5 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 159
PM × Wind × Precip
PM2.5 at 14.7 µg/m³, PM10 at 17.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.86
- 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
- 10:47 PM
- Moonset
- 9:55 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Stony Brook at a glance
- Today vs. normal: 24°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 11790, 11794
16-Day Forecast — Stony Brook
- Sat96°76°42%
- Sun86°70°43%
- Mon70°67°84%
- Tue69°63°81%
- Wed76°63°26%
- Thu85°69°9%
- Fri88°71°40%
- Sat85°74°37%
- Sun83°71°19%
- Mon72°67°19%
- Tue79°67°20%
- Wed84°66°25%
- Thu85°73°45%
- Fri90°73°35%
- Sat89°74°27%
- Sun89°74°42%
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 — Stony Brook
SPC has placed Stony Brook in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- 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.
Beaches near Stony Brook
- Robert Moses Beach20.8 mi
- Jones Beach29.2 mi
Each linked page shows live water temperature, wave height, swim and surf verdicts, tides, and rip-current risk from NDBC + NOAA + NWS data.
ZIP codes in Stony Brook
- 11790