Castlerock — Water Temperature in March
Water Temperature Range
6°C
minimum
8°C
average
10°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 | 2026 | 2025 | 2024 | 2023 |
|---|---|---|---|---|
| MAR 1 | -10°C | 8°C | 8°C | 8°C |
| MAR 2 | 7°C | 8°C | 8°C | 8°C |
| MAR 3 | 7°C | 8°C | 8°C | 7°C |
| MAR 4 | 7°C | 8°C | 8°C | 8°C |
| MAR 5 | 7°C | 8°C | 7°C | 8°C |
| MAR 6 | 8°C | 8°C | 7°C | 8°C |
| MAR 7 | 8°C | 8°C | 7°C | 8°C |
| MAR 8 | 8°C | 7°C | 7°C | 8°C |
| MAR 9 | 8°C | 7°C | 8°C | 7°C |
| MAR 10 | 8°C | 8°C | 7°C | 8°C |
| MAR 11 | 8°C | 8°C | 8°C | 7°C |
| MAR 12 | 7°C | 8°C | 8°C | 8°C |
| MAR 13 | 7°C | 8°C | 9°C | 8°C |
| MAR 14 | 8°C | 8°C | 9°C | 8°C |
| MAR 15 | 8°C | 8°C | 8°C | 8°C |
| MAR 16 | 8°C | 8°C | 8°C | 8°C |
| MAR 17 | 8°C | 7°C | 8°C | 8°C |
| MAR 18 | 8°C | 8°C | 8°C | 7°C |
| MAR 19 | 8°C | 8°C | 9°C | 8°C |
| MAR 20 | 8°C | 8°C | 8°C | 8°C |
| MAR 21 | 8°C | 8°C | 8°C | 8°C |
| MAR 22 | 8°C | 7°C | 8°C | 8°C |
| MAR 23 | 8°C | 7°C | 8°C | 8°C |
| MAR 24 | 8°C | 8°C | 8°C | 8°C |
| MAR 25 | 8°C | 7°C | 8°C | 8°C |
| MAR 26 | 8°C | 8°C | 8°C | 8°C |
| MAR 27 | 8°C | 8°C | 8°C | 8°C |
| MAR 28 | 8°C | 8°C | 8°C | 8°C |
| MAR 29 | 8°C | 8°C | 8°C | 8°C |
| MAR 30 | 8°C | 8°C | 8°C | 8°C |
| MAR 31 | 8°C | 7°C | 8°C | 8°C |
March: Climate and Swimming Opportunities
Average Night Air Temperature
4°C
Average Day Air Temperature
10°C
Precipitation Amount per Month
97 mm
Number of Rainy Days
16
Daylight per Day
12 hrs
Sunshine per Day
3 hrs
Average Wind Speed
22 km/h
Average Humidity
86%
At such water and air temperatures, swimming feels icy and can be a shock to the body. If you go in at all, keep it extremely short and warm up immediately afterward.