Castle Rock — Water Temperature in August
Water Temperature Range
17°C
minimum
18°C
average
20°C
maximum
Water Temperature Chart for August
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
| 2025 | 2024 | 2023 | 2022 | |
|---|---|---|---|---|
| AUG 1 | 19°C | 18°C | 19°C | 20°C |
| AUG 2 | 19°C | 18°C | 19°C | 20°C |
| AUG 3 | 19°C | 18°C | 19°C | 19°C |
| AUG 4 | 19°C | 18°C | 19°C | 19°C |
| AUG 5 | 19°C | 18°C | 19°C | 19°C |
| AUG 6 | 19°C | 18°C | 19°C | 19°C |
| AUG 7 | 19°C | 18°C | 19°C | 19°C |
| AUG 8 | 18°C | 17°C | 19°C | 19°C |
| AUG 9 | 18°C | 17°C | 19°C | 19°C |
| AUG 10 | 18°C | 18°C | 18°C | 19°C |
| AUG 11 | 18°C | 17°C | 19°C | 18°C |
| AUG 12 | 18°C | 17°C | 18°C | 18°C |
| AUG 13 | 18°C | 17°C | 19°C | 18°C |
| AUG 14 | 18°C | 17°C | 19°C | 18°C |
| AUG 15 | 18°C | 18°C | 18°C | 18°C |
| AUG 16 | 18°C | 18°C | 19°C | 18°C |
| AUG 17 | 18°C | 18°C | 18°C | 18°C |
| AUG 18 | 18°C | 17°C | 18°C | 18°C |
| AUG 19 | 18°C | 18°C | 18°C | 19°C |
| AUG 20 | 18°C | 17°C | 19°C | 18°C |
| AUG 21 | 19°C | 18°C | 19°C | 19°C |
| AUG 22 | 18°C | 18°C | 18°C | 19°C |
| AUG 23 | 18°C | 18°C | 18°C | 19°C |
| AUG 24 | 18°C | 18°C | 18°C | 19°C |
| AUG 25 | 19°C | 18°C | 19°C | 19°C |
| AUG 26 | 19°C | 18°C | 19°C | 19°C |
| AUG 27 | 18°C | 18°C | 18°C | 19°C |
| AUG 28 | 18°C | 18°C | 18°C | 19°C |
| AUG 29 | 18°C | 18°C | 18°C | 19°C |
| AUG 30 | 18°C | 18°C | 18°C | 18°C |
| AUG 31 | 18°C | 18°C | 18°C | 18°C |
Climate and Swimming Opportunities in Castle Rock in August
Average Day Air Temperature
18°C
Average Night Air Temperature
9°C
Precipitation Amount per Month
120 mm
Number of Rainy Days
16
Daylight per Day
11 hrs
Sunshine per Day
6 hrs
Average Wind Speed
17 km/h
Average Humidity
71%
At such water and air temperatures, swimming often feels chilly and is best for short swims. Getting out can feel cold, so it helps to have dry clothes ready right away.