Islip Weather In July

The highest recorded temperature for Islip for the past 22 years in July was 102°F, and the normal high is 83.2°F. The lowest documented temperature in July for Islip for the past 22 years was 50°F, and the mean daily low in the month is 65.9°F.

Islip typically receives an average of 2.93 inches of rain during the month.