Trondheim — Water Temperature in October

Water Temperature Range

7°C

minimum

11°C

average

13°C

maximum

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

October: Climate and Swimming Opportunities

Average Night Air Temperature

3°C

Average Day Air Temperature

10°C

Precipitation Amount per Month

89 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

2 hrs

Average Wind Speed

14 km/h

Average Humidity

82%

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.