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Stony Brook, United States Snapshot 2026
Where is Stony Brook?
Stony Brook, United States
- Continent
- Americas
- Country
- United States
- City
- Stony Brook
- Population
- 13.7K
- Elevation
- 27 m
- Coordinates
- 40.93°, -73.14°
Stony Brook is a city in United States with a population of approximately 13.7K. Average temperatures range from -1°C (30°F) in January to 28°C (82°F) in July. The best time to visit is June, August, September.
Time in Stony Brook right now
Open full time & time zone page 15:24 24
Monday, June 15, 2026
IANA time zone
America/New_York
Daylight saving
DST in effect
EST / EDT
Next DST change
November 1
backward -1h
Live weather in Stony Brook
Daylight in Stony Brook today
View full sunrise & sunset page Sunrise
Sunset
Day length
15h 06m
Climate normals for Stony Brook
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May
Good June best
Excellent July
Good August best
Excellent September best
Excellent October
Good November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -1°C | 0°C / -6°C | 9days (89 mm) Wet | 6.1h Fair | 70% Muggy | 2.3 Moderate | Poor | View Details |
| February | 6°C / -1°C | 2°C / -5°C | 10days (89 mm) Wet | 6.7h Fair | 72% Muggy | 3.3 Moderate | Poor | View Details |
| March | 9°C / 2°C | 6°C / -2°C | 10days (100 mm) Wet | 8.3h Good | 69% Muggy | 4.7 Moderate | Poor | View Details |
| April | 14°C / 7°C | 12°C / 3°C | 11days (102 mm) Wet | 9h Good | 71% Muggy | 5.5 High | Fair | View Details |
| May | 19°C / 12°C | 19°C / 10°C | 12days (100 mm) Wet | 9.8h Good | 75% Muggy | 6.3 High | Good | View Details |
| June best | 24°C / 18°C | 26°C / 18°C | 10days (76 mm) Wet | 11.4h Excellent | 75% Muggy | 7.1 Very High | Excellent | View Details |
| July | 28°C / 22°C | 31°C / 24°C | 13days (110 mm) Wet | 11.8h Excellent | 77% Humid | 7.3 Very High | Good | View Details |
| August best | 27°C / 21°C | 29°C / 23°C | 11days (87 mm) Wet | 10.8h Excellent | 76% Humid | 6.6 High | Excellent | View Details |
| September best | 23°C / 18°C | 24°C / 18°C | 9days (100 mm) Wet | 9h Good | 76% Humid | 5.1 High | Excellent | View Details |
| October | 18°C / 13°C | 17°C / 11°C | 10days (114 mm) Wet | 7.6h Good | 75% Muggy | 4.1 Moderate | Good | View Details |
| November | 12°C / 6°C | 9°C / 3°C | 8days (81 mm) Wet | 6.9h Fair | 70% Muggy | 2.9 Moderate | Fair | View Details |
| December | 7°C / 1°C | 3°C / -3°C | 10days (116 mm) Wet | 5.7h Fair | 72% Muggy | 2.1 Moderate | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 4°C / -1°C . Feb: 6°C / -1°C . Mar: 9°C / 2°C . Apr: 14°C / 7°C . May: 19°C / 12°C . Jun: 24°C / 18°C . Jul: 28°C / 22°C . Aug: 27°C / 21°C . Sep: 23°C / 18°C . Oct: 18°C / 13°C . Nov: 12°C / 6°C . Dec: 7°C / 1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 89 mm. Feb: 89 mm. Mar: 100 mm. Apr: 102 mm. May: 100 mm. Jun: 76 mm. Jul: 110 mm. Aug: 87 mm. Sep: 100 mm. Oct: 114 mm. Nov: 81 mm. Dec: 116 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 70%. Feb: 72%. Mar: 69%. Apr: 71%. May: 75%. Jun: 75%. Jul: 77%. Aug: 76%. Sep: 76%. Oct: 75%. Nov: 70%. Dec: 72%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 22 km/h . Feb: 21 km/h . Mar: 22 km/h . Apr: 21 km/h . May: 18 km/h . Jun: 17 km/h . Jul: 16 km/h . Aug: 16 km/h . Sep: 17 km/h . Oct: 19 km/h . Nov: 21 km/h . Dec: 21 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 5°C . Feb: 4°C . Mar: 5°C . Apr: 9°C . May: 14°C . Jun: 18°C . Jul: 23°C . Aug: 23°C . Sep: 22°C . Oct: 18°C . Nov: 13°C . Dec: 7°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 5. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Frequently Asked Questions
Stony Brook has a population of approximately 13.7K.
The best months to visit Stony Brook are June, August, September, when temperatures are pleasant and rainfall is lower.
Stony Brook receives approximately 1164mm of rainfall annually across 123 rainy days.
Stony Brook is located in United States, in the Americas region.
Stony Brook sits at an elevation of 27 m (89 ft) above sea level.