Temperatures in July
It's cool to moderate in July in Long Island with an average temperature of 18°C. Temperatures this month range from a low of 16°C to a high of 19°C. At night, you can expect temperatures between 11°C and 13°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Long Island in July. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of July
The month of July starts in Long Island with mild temperatures, averaging around 18°C during the day and nights close to 12°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-July
By mid-July, the average daytime temperature stays the same at 18°C, with nights close to 12°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of July
By the end of July, the average daytime temperature in Long Island will be around 19°C, with nights close to 13°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in July
In July, there is an average of 129 mm of precipitation, spread over 15 days. The wind speed is around 3 Bft, mostly coming from the South.
The average precipitation chance is 48% per day this month. Though it seems average, the weather’s variable. Some days have a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in July for Long Island. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Long Island in July |
London | ||
|---|---|---|---|
 Average Temperature |
18°C | 23°C | |
 High Temp |
19°C | 27°C | |
| Low Temp |
16°C | 21°C | |
 Total Precipitation |
129 mm | 52 mm | |
| Rainy Days |
15 days | 9 days | |
June
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is July a good time to visit Long Island?
After some sun? Then July isn’t the best time to be in Long Island. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Long Island in July
With 29°C, Long Island hit the highest temperature in the last 10 years in July 2018. The lowest daytime temperature in this month was 12°C in 2017. The extreme night temperatures ranged from a low of 6°C to a high of 16°C.
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Daily Temperature in July in Long Island
This chart shows the average daily temperatures, both day and night, for each day in July in Long Island, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in July in Long Island
The chart below shows the average daily precipitation in July for Long Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown 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 rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for July, you can expect around 15 days of rain in Long Island.
Daily UV Index in July in Long Island
This chart shows the average daily UV index in July 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 July in Long Island Over the Years
This chart shows the average temperature in July in Long Island, measured in degrees Celsius, over the past years.
Total Precipitation in July in Long Island Over the Years
This chart shows the average precipitation in July in Long Island, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in July for Long Island
Click on a specific day in July for detailed info on the typical 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 July in Long Island
Have you been to Long Island in July?
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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
