Live Weather & Forecast
Weather in Stony Brook
New York, United States · Real-time conditions & 3-day outlook
24°C
Feels like 25°C
75°F / Feels 77°F
Partly cloudy
Stony Brook, New York
🌞 Daytime
Updated: 2026-04-15 17:15
Humidity
52%
Wind
20.5 km/h SSW
Wind Gust
43.1 km/h
Pressure
1011 mb
Visibility
16 km
UV Index
1.6
(Low)
Precipitation
0 mm
Cloud Cover
75%
Dew Point
16.9°C
Wind Degree
211°
Air Quality Index
US EPA: Moderate
UK DEFRA: Low (2)
CO
243.9 μg/m³
NO₂
30.2 μg/m³
O₃
94 μg/m³
SO₂
3.8 μg/m³
PM 2.5
15.7 μg/m³
PM 10
18.6 μg/m³
Today's Hourly Forecast
24-hour breakdown for Stony Brook, New York
12 AM
18°
Clear
1 AM
18°
Patchy rain nearby
2 AM
17°
Clear
3 AM
16°
Clear
4 AM
16°
Clear
5 AM
16°
Clear
6 AM
16°
Clear
7 AM
18°
Sunny
8 AM
19°
Sunny
9 AM
20°
Sunny
10 AM
22°
Partly Cloudy
11 AM
23°
Sunny
12 PM
24°
Sunny
1 PM
25°
Sunny
2 PM
27°
Sunny
3 PM
28°
Sunny
4 PM
28°
Sunny
5 PM
24°
Partly cloudy
6 PM
26°
Sunny
7 PM
23°
Sunny
8 PM
21°
Clear
9 PM
20°
Clear
10 PM
20°
Clear
11 PM
18°
Clear
3-Day Forecast
Daily overview for Stony Brook, New York
Today
Sunny
29°
/
15°
🌧️ 0% chance of rain
💧 Avg. humidity: 64%
💨 Max wind: 22.7 km/h
🌧️ Total precip: 0.06 mm
☀️ UV Index: 2
🌅 Sunrise: 06:13 AM
🌇 Sunset: 07:32 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Sunny
25°
/
14°
🌧️ 0% chance of rain
💧 Avg. humidity: 69%
💨 Max wind: 23.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:11 AM
🌇 Sunset: 07:33 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Partly Cloudy
21°
/
13°
🌧️ 0% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 20.5 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:10 AM
🌇 Sunset: 07:35 PM
🌙 New Moon
🌑 Moon: 0% lit
Best Time to Visit Stony Brook
Plan your trip to Stony Brook, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Stony Brook?
Current conditions in Stony Brook: Partly cloudy, temperature 24°C, humidity 52%.
What is the best time to visit Stony Brook?
The best time to visit Stony Brook is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Stony Brook?
Stony Brook is located at approximately 40.9° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Stony Brook?
The wettest period in Stony Brook is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Stony Brook?
For visits to Stony Brook during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Stony Brook in?
Stony Brook is located in United States, in the state of New York.
What are the public holidays in Stony Brook in 2026?
View the 2026 public holidays for Stony Brook on our Holidays page.
What are the GPS coordinates used for the weather forecast in Stony Brook?
The weather forecast for Stony Brook uses coordinates 40.9257, -73.1409.