Islamorada — Water Temperature in May

Water Temperature Range

24°C

minimum

28°C

average

33°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2026	2025	2024	2023
MAY 1	-10°C	29°C	26°C	28°C
MAY 2	28°C	27°C	26°C	29°C
MAY 3	29°C	27°C	25°C	30°C
MAY 4	29°C	26°C	25°C	28°C
MAY 5	29°C	27°C	26°C	29°C
MAY 6	28°C	27°C	27°C	29°C
MAY 7	29°C	28°C	28°C	30°C
MAY 8	29°C	28°C	28°C	29°C
MAY 9	29°C	27°C	28°C	28°C
MAY 10	29°C	28°C	28°C	29°C
MAY 11	30°C	28°C	28°C	29°C
MAY 12	30°C	28°C	27°C	30°C
MAY 13	31°C	28°C	26°C	31°C
MAY 14	30°C	28°C	27°C	29°C
MAY 15	30°C	28°C	28°C	30°C
MAY 16	30°C	28°C	29°C	28°C
MAY 17	30°C	28°C	29°C	27°C
MAY 18	31°C	28°C	29°C	28°C
MAY 19	30°C	28°C	30°C	26°C
MAY 20	29°C	28°C	30°C	26°C
MAY 21	28°C	27°C	29°C	25°C
MAY 22	28°C	27°C	30°C	24°C
MAY 23	28°C	28°C	30°C	26°C
MAY 24	29°C	28°C	30°C	25°C
MAY 25	29°C	29°C	31°C	27°C
MAY 26	29°C	28°C	31°C	26°C
MAY 27	30°C	28°C	30°C	26°C
MAY 28	29°C	29°C	30°C	28°C
MAY 29	29°C	29°C	30°C	27°C
MAY 30	29°C	29°C	31°C	29°C
MAY 31	30°C	30°C	31°C	29°C

May: Climate and Swimming Opportunities

Average Night Air Temperature

22°C

Average Day Air Temperature

30°C

Precipitation Amount per Month

116 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

10 hrs

Average Wind Speed

17 km/h

Average Humidity

73%

At such water and air temperatures, swimming feels truly comfortable and relaxing. The warm water won’t cool you down, so you can stay in for a long time without getting chilled.