Stewart Island — Water Temperature in October

Water Temperature Range

10°C

minimum

12°C

average

14°C

maximum

Water Temperature Chart for October

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

Climate and Swimming Opportunities in Stewart Island in October

Average Day Air Temperature

16°C

Average Night Air Temperature

4°C

Precipitation Amount per Month

93 mm

Number of Rainy Days

Daylight per Day

13 hrs

Sunshine per Day

6 hrs

Average Wind Speed

14 km/h

Average Humidity

70%

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.