Stony Brook, New York Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Stony Brook weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——83°57°—
- FridayJun 5Overcast——89°56°+6°
- SaturdayJun 6Overcast45%—86°69°-3°
- SundayJun 7Drizzle52%0.03″81°64°-5°
- MondayJun 8Overcast18%—72°58°-9°
- TuesdayJun 9Overcast——81°61°+9°
- WednesdayJun 10Light Drizzle——79°61°-2°
PM2.5 at 9.7 µg/m³ (AQI 52) with a 0.76 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust. AQI flat over the last 6 hours (within ±3 points).
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 44 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 20 by mid-afternoon.
- Present
- AQI 44
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 9.7 µg/m³ (AQI 52) with a 0.76 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.76
- 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
- 3:23 AM
- Moonset
- 12:49 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Stony Brook at a glance
- Today vs. normal: 14°F below the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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.
Beaches near Stony Brook
- Robert Moses Beach20.8 mi
- Jones Beach 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.