Cape Henlopen State Park water temperature

Typically about 73° in August — perfect.

from the Lewes harbor station, about 2 miles away

perfect

bath-warm 80° and up perfect 72–79° refreshing 65–71° brisk below 65° 73° typical for August

The year at a glance

Swimmable from July through September.

swimmable 30° 40° 50° 60° 70° 80° 74° 40° JFMAMJJASOND January: typically 40° — brisk February: typically 41° — brisk March: typically 46° — brisk April: typically 54° — brisk May: typically 61° — brisk June: typically 69° — refreshing July: typically 74° — perfect August: typically 73° — perfect September: typically 73° — perfect October: typically 65° — refreshing November: typically 55° — brisk December: typically 44° — brisk

Month by month

Month Typical Feels
January 40° brisk
February 41° brisk
March 46° brisk
April 54° brisk
May 61° brisk
June 69° refreshing
July 74° perfect
August 73° perfect
September 73° perfect
October 65° refreshing
November 55° brisk
December 44° brisk

About this reading

The Lewes harbor station sits in the harbor; open-water surf can read a few degrees different.

Reading from the Lewes harbor station, about 2 miles away.

Warm water says nothing about surf, rip currents, or bacteria — check local lifeguard flags and advisories.