Islip (NY) monthly weather averages

Contents

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Islip

Islip average temperature chart (Celsius) Islip average temperature chart (Fahrenheit)
Average monthly temperatures in Islip (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 3.2 4.2 8.9 14.6 20 24.9 27.8 27.1 23.5 17.9 12.1 6.1
°F 37.8 39.6 48.1 58.3 68 76.8 82 80.8 74.3 64.3 53.8 42.9

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Islip monthly rainfall chart (mm) Islip monthly rainfall chart (inches)
Average monthly rainfall in Islip (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 92 85 106 104 100 89 91 100 89 88 106 105
inches 3.6 3.3 4.2 4.1 3.9 3.5 3.6 3.9 3.5 3.5 4.2 4.1
Rainy days 10 10 11 10 11 10 9 9 8 7 10 11

Average annual rainfall in Islip: 1122.4mm (441.9 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Islip

Islip average daily sunshine chart
Average daily sunshine Islip
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 6 6.8 7.8 8.5 9 9.5 9.4 9.1 8 7.5 5.6 5.1

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Islip average minimum / maximum temperatures (Celsius) Islip average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Islip (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -4.8 -4.2 -0.2 4.4 9.6 14.9 18.2 18.1 14.3 8.5 3.7 -1.7
Max °C 3.4 4.4 9.2 14.9 20.3 25.2 28 27.4 23.8 18.2 12.3 6.3
Min °F 23.4 24.4 31.7 39.8 49.2 58.7 64.8 64.5 57.7 47.2 38.7 29
Max °F 30.7 32.2 40.1 49.3 58.8 68 73.6 72.9 66.2 55.9 46.4 36.1

Sea temperature

The graph below shows the average sea temperature.

Islip average sea temperature chart (Celsius) Islip average sea temperature chart (Fahrenheit)
Average sea temperature around Islip in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.8 4.9 4.8 6.9 11.2 17 21.8 22.8 20.6 16.8 12.9 9.6
°F 44.2 40.8 40.6 44.4 52.2 62.5 71.3 73 69.1 62.3 55.2 49.2

Wind speed

The graph below shows the average wind speed.

Islip average winspeed by month (km/h) Islip average winspeed by month (mph)
Average wind speed in Islip (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 21 21 21 21 18 17 16 16 17 18 19 20
mph 13 13 13 13 11 11 10 10 11 11 12 13

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Islip relative humidity averages
Average relative humidity in Islip
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
67% 66% 65% 64% 70% 72% 73% 75% 75% 71% 70% 68%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Islip weather stats

Islip weather statistics
Hottest month: July 27.8°C 82°F
Driest month: February 85mm 3.3ins
Sunniest month: August 9.1hrs
Coldest month: January 3.2°C 37.8°F
Wettest month: March 106mm 4.2ins
Warmest sea: August 22.8°C 73°F
Map showing location of Islip (40.72982, -73.21039) Islip map pin © Google

Locations nearby

Top United States locations