Seattle — Water Temperature in July

Water Temperature Range

10°C

minimum

13°C

average

15°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

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

July: Climate and Swimming Opportunities

Average Night Air Temperature

13°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

20 mm

Number of Rainy Days

Daylight per Day

15 hrs

Sunshine per Day

10 hrs

Average Wind Speed

12 km/h

Average Humidity

67%

With such a ratio between the average monthly temperatures of water and air, swimming feels very cold and is only for cold-water enthusiasts. Most people will prefer just a brief splash, because warming up afterward can take time.