Normal weather for Long Island in August
It's cool to moderate in August in Long Island with an average temperature of 18°C. Temperatures this month range from a low of 16°C to a high of 20°C. At night, you can expect temperatures between 11°C and 13°C.
In August, there is an average of 214 mm of precipitation, spread over 21 days. The wind speed is around 3 Bft, mostly coming from the South.
Long Island in August |
New York | ||
|---|---|---|---|
 Average Temperature |
18°C | 30°C | |
 High Temp |
20°C | 31°C | |
| Low Temp |
16°C | 28°C | |
 Total Precipitation |
214 mm | 79 mm | |
| Rainy Days |
21 days | 13 days | |
Start of August
The month of August starts in Long Island with mild temps, averaging around 19°C during the day and nights around 13°C. You can expect regular precipitation, but there will also be some sunny days in the early part of the month.
With the temperature difference between day and night, it’s smart to wear layers. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
Mid August
By mid-August, daytime temps drop to around 18°C, with nights around 13°C. There’s a high chance of precipitation during this time.
Since it cools down at night, it’s a good idea to wear layers. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
End of August
By the end of August, the average daytime temperature in Long Island is around 18°C, while nighttime temps are about 12°C. There’s a significant chance of many days with precipitation.
Because temperatures drop in the evening, wearing layers is recommended. During the day, a shirt, maybe a light sweater, and thin pants will do. In the evening and morning, choose a light jacket, sweater or hoodie, and long pants.
Find affordable trips to Long Island 
UV index
The UV index is a maximum of 6 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is August a good time to visit Long Island?
Looking for sun? August isn’t a good month to be in Long Island. The temperature is nice, but there’s too much chance of rain.
Temperature records for Long Island in August
Check out the climate of Long Island for all months and discover the best travel time
July
Plan your next vacation
Don’t miss the best vacation deals for Long Island and see what our partners have for you.
Daily Temperature in August in Long Island
This chart shows the average daily high and low temperatures in August for Long Island, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in August in Long Island
The chart below shows the average daily precipitation in August for Long Island, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for August, you can expect about 21 days of precipitation in Long Island.
Daily UV Index in August in Long Island
This chart shows the average daily UV index in August in Long Island, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in August in Long Island Over the Years
This chart shows the average temperature in August in Long Island, measured in degrees Celsius, over the past few years.
Total Precipitation in August in Long Island Over the Years
This chart shows the average precipitation in August in Long Island, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
Daily Climate in August for Long Island
Click on any day in August to get detailed info about the usual weather on that day in Long Island. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in August in Long Island
Have you been to Long Island in August?
Share your weather experience in August in Long Island.
Average Weather in Long Island by Month
Click on a month below to see detailed weather info for Long Island. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Long Island for all months at once
