Mattapoisett — Water Temperature in August
Water Temperature Range
18°C
minimum
22°C
average
25°C
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 |
|---|---|---|---|---|
| AUG 1 | 22°C | 22°C | 21°C | 24°C |
| AUG 2 | 22°C | 22°C | 22°C | 23°C |
| AUG 3 | 22°C | 20°C | 22°C | 24°C |
| AUG 4 | 22°C | 21°C | 23°C | 24°C |
| AUG 5 | 22°C | 20°C | 22°C | 23°C |
| AUG 6 | 21°C | 21°C | 22°C | 22°C |
| AUG 7 | 21°C | 21°C | 22°C | 21°C |
| AUG 8 | 21°C | 21°C | 22°C | 21°C |
| AUG 9 | 21°C | 20°C | 22°C | 21°C |
| AUG 10 | 22°C | 21°C | 23°C | 22°C |
| AUG 11 | 21°C | 20°C | 23°C | 22°C |
| AUG 12 | 22°C | 22°C | 22°C | 23°C |
| AUG 13 | 22°C | 21°C | 23°C | 22°C |
| AUG 14 | 23°C | 21°C | 25°C | 23°C |
| AUG 15 | 22°C | 21°C | 24°C | 22°C |
| AUG 16 | 22°C | 21°C | 24°C | 22°C |
| AUG 17 | 23°C | 22°C | 24°C | 23°C |
| AUG 18 | 22°C | 21°C | 23°C | 22°C |
| AUG 19 | 22°C | 21°C | 23°C | 21°C |
| AUG 20 | 22°C | 21°C | 24°C | 22°C |
| AUG 21 | 22°C | 21°C | 23°C | 22°C |
| AUG 22 | 22°C | 20°C | 24°C | 22°C |
| AUG 23 | 22°C | 21°C | 23°C | 22°C |
| AUG 24 | 22°C | 20°C | 23°C | 22°C |
| AUG 25 | 22°C | 21°C | 24°C | 22°C |
| AUG 26 | 22°C | 20°C | 24°C | 22°C |
| AUG 27 | 22°C | 20°C | 24°C | 22°C |
| AUG 28 | 22°C | 19°C | 24°C | 22°C |
| AUG 29 | 21°C | 20°C | 23°C | 21°C |
| AUG 30 | 22°C | 20°C | 24°C | 21°C |
| AUG 31 | 21°C | 20°C | 24°C | 21°C |
August: Climate and Swimming Opportunities
Average Night Air Temperature
11°C
Average Day Air Temperature
20°C
Precipitation Amount per Month
21 mm
Number of Rainy Days
6
Daylight per Day
14 hrs
Sunshine per Day
9 hrs
Average Wind Speed
14 km/h
Average Humidity
73%
With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.