Castle Rock — Water Temperature in January

Water Temperature Range

18°C

minimum

21°C

average

23°C

maximum

Water Temperature Chart for January

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

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

Climate and Swimming Opportunities in Castle Rock in January

Average Day Air Temperature

30°C

Average Night Air Temperature

15°C

Precipitation Amount per Month

10 mm

Number of Rainy Days

Daylight per Day

14 hrs

Sunshine per Day

10 hrs

Average Wind Speed

22 km/h

Average Humidity

49%

At such water and air temperatures, swimming is pleasant and refreshing rather than hot. After you get in, it feels comfortable, and you’ll warm up quickly when you come out.