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Sumner Bar water temperature
Sumner Bar ratings
Quality on a good day: 4.1
Consistency of Surf: 2.0
Difficulty Level: 3.1
Wind and Kite Surfing: 2.2
Crowds: 4.0

Overall: 3.5

See all 18 ratings

Based on 12 votes. Vote


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Sumner Bar Water Temperature and Wetsuit Guide

(Canterbury, New Zealand)

Today's Sumner Bar sea temperature is 9.4 °C.

Statistics for 18 Aug (1981–2005) – mean: 9.1 °C, range: 8.5 °C to 10.1 °C

Sunny with pleasant to warm air temperatures (feels like 16 °C) at Sumner Bar, yet the sea remains very cold (9 °C). Surfers will need a thick winter wetsuit, a hood, gloves and neoprene boots.

New Zealand Sea Water Temperature

Map of current New Zealand
Surface Water Temperatures
based on measurements from oceanographic satellites
New Zealand Water Temperature Anomaly

Map of current New Zealand
Sea Water Temperature Anomalies

(compared with long term averages
at this time of year)

(click thumbnails to expand)

Below is a graph of Historical Sea Surface Temperature for Sumner Bar. This has been derived from analysis of two decades of oceanographic satellite measurements of nearby open water. We have calculated the average water temperature variation around the year as well as the extremes that have been observed on each date.

Sumner Bar Water Temperature Graph

All of the graphs for the surf breaks presented on Surf-Forecast.com are on the same scale to enable comparison between locations around the world.

Sumner Bar water temperatures peak in the range 14 to 17°C (57 to 63°F) on around the 8th of February and are at their lowest on about the 2nd of August, in the range 8 to 10°C (46 to 50°F). The highest seasonal water temperatures at Sumner Bar in early to mid February lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots. At its lowest in early August, low water temperatures at Sumner Bar are suited to a 5/4mm or 5/3mm good quality wetsuit with neoprene gloves and 3mm boots. You will need a hood if it's windy or the air is cold.

Actual sea surface water temperatures close to shore at Sumner Bar can vary by several degrees compared with these open water averages. This is especially true after heavy rain, close to river mouths or after long periods of strong offshore winds. Offshore winds cause colder deep water to replace surface water that has been warmed by the sun. Air temperature, wind-chill and sunshine should also be considered before deciding on the kind of wetsuit needed to stay warm when surfing at Sumner Bar. Refer to our detailed weather forecasts for this information.