Ostional — Water Temperature in May
Water Temperature Range
82°F
minimum
85°F
average
90°F
maximum
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 | 2025 | 2024 | 2023 | 2022 |
|---|---|---|---|---|
| MAY 1 | 86°F | 86°F | 84°F | 88°F |
| MAY 2 | 84°F | 84°F | 84°F | 86°F |
| MAY 3 | 84°F | 86°F | 86°F | 82°F |
| MAY 4 | 86°F | 86°F | 84°F | 82°F |
| MAY 5 | 86°F | 84°F | 84°F | 88°F |
| MAY 6 | 84°F | 86°F | 84°F | 82°F |
| MAY 7 | 86°F | 86°F | 84°F | 86°F |
| MAY 8 | 84°F | 84°F | 84°F | 82°F |
| MAY 9 | 84°F | 84°F | 84°F | 86°F |
| MAY 10 | 84°F | 84°F | 84°F | 84°F |
| MAY 11 | 86°F | 86°F | 84°F | 88°F |
| MAY 12 | 86°F | 86°F | 86°F | 88°F |
| MAY 13 | 86°F | 84°F | 84°F | 88°F |
| MAY 14 | 86°F | 84°F | 84°F | 86°F |
| MAY 15 | 86°F | 86°F | 84°F | 84°F |
| MAY 16 | 86°F | 86°F | 84°F | 88°F |
| MAY 17 | 84°F | 84°F | 84°F | 84°F |
| MAY 18 | 86°F | 86°F | 84°F | 88°F |
| MAY 19 | 86°F | 86°F | 84°F | 88°F |
| MAY 20 | 86°F | 86°F | 84°F | 88°F |
| MAY 21 | 84°F | 84°F | 84°F | 84°F |
| MAY 22 | 86°F | 86°F | 84°F | 88°F |
| MAY 23 | 86°F | 86°F | 86°F | 84°F |
| MAY 24 | 84°F | 84°F | 86°F | 82°F |
| MAY 25 | 86°F | 86°F | 86°F | 88°F |
| MAY 26 | 86°F | 86°F | 86°F | 86°F |
| MAY 27 | 86°F | 86°F | 84°F | 86°F |
| MAY 28 | 86°F | 84°F | 86°F | 88°F |
| MAY 29 | 84°F | 86°F | 84°F | 84°F |
| MAY 30 | 84°F | 86°F | 84°F | 82°F |
| MAY 31 | 86°F | 86°F | 84°F | 88°F |
May: Climate and Swimming Opportunities
Average Night Air Temperature
72°F
Average Day Air Temperature
91°F
Precipitation Amount per Month
6.12 in
Number of Rainy Days
14
Daylight per Day
12 hrs
Sunshine per Day
6 hrs
Average Wind Speed
7 mph
Average Humidity
82%
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.