The best times to visit Stony Brook for ideal weather are
May 7th to July 8th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
Stony Brook Travel Guide
Other Stony Brook Travel Info
Weather in Stony Brook
Average temperatures in Stony Brook vary drastically. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a chance of rain or snow throughout most of the year. The area is less temperate than some — in the 26th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Stony Brook, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 86.5°F (30.3°C) with temperatures rarely dropping below 68.7°F (20.4°C) at night.
Stony Brook Temperatures (Fahrenheit)
Stony Brook Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
Stony Brook Perceived Temperature (F)
Stony Brook Perceived Temperature (C)
Average Stony Brook Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Stony Brook are November, September, and then October. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early July. For example, on the week of July 2nd there is 1 day of precipitation on average. By contrast, it’s most likely to rain or snow in late January with an average of 3 days of significant precipitation the week of January 22nd.
When can you find snow in Stony Brook? Weather stations report large amounts of snow likely to be deepest around February, especially close to late January and early February. The best time to ski (if at all) in Stony Brook is often around around January 15th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in Stony Brook.
Snow on the Ground
The graph below shows the average snow on the ground in Stony Brook (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
Stony Brook has some slightly muggy months, with moderately humid months on the other side of the year. The least humid month is March (49.9% relative humidity), and the most humid month is September (64.5%).
Wind in Stony Brook is usually moderate. The windiest month is April, followed by March and February. April’s average wind speed of around 9.3 knots (10.7 MPH or 17.2 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid February where average top sustained speeds reach 17.6 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in Stony Brook.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||8.6||Gentle breeze||15.8||Significant breeze|
|Feb||8.8||Gentle breeze||16.6||Significant breeze|
|Mar||9.2||Gentle breeze||16.3||Significant breeze|
|Apr||9.3||Gentle breeze||16.5||Significant breeze|
|May||7.3||Gentle breeze||13.7||Significant breeze|
|Jun||7.2||Gentle breeze||13.8||Significant breeze|
|Jul||6.9||Light breeze||12.9||Significant breeze|
|Aug||6.5||Light breeze||12.8||Significant breeze|
|Sep||6.7||Light breeze||12.9||Significant breeze|
|Oct||7.7||Gentle breeze||14.2||Significant breeze|
|Nov||7.9||Gentle breeze||14.6||Significant breeze|
|Dec||8.3||Gentle breeze||15||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to Stony Brook?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in Stony Brook, NY, US is July, followed by October and February. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Stony Brook in December. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall Stony Brook Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel moderately cold. Highs range from 76.9°F (24.9°C) and 42°F (5.6°C) with far warmer temperatures in the later months. Rain is somewhat common with 6 to 8 days of significant precipitation per month. Spring is fairly slow for tourism, which makes it a good time for those looking for deals.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see moderate precipitation with 6 to 8 days of precipitation per month. June – August is the busiest season for tourism in Stony Brook, so lodging and other accommodations may cost more than usual.
Fall (September through November)
Fall daily highs range from 81.1°F (27.3°C) and 52.1°F (11.2°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 5 to 6 days per month. Tourism is the second busiest during these months due to the weather, so hotels may be slightly higher priced.
Winter (December through February)
Weather is far too cold this time of year in Stony Brook to be enjoyable for warm weather travelers. The average high during this season is between 49.3°F (9.6°C) and 33.8°F (1°C). On average, it rains or snows a fair amount: 6 to 9 times per month. These times of year are the slowest with tourists.