uk es it fr pt nl
Costellos water temperature
Costellos ratings
Quality on a good day: 3.0
Consistency of Surf: 2.0
Difficulty Level: 3.0
Crowds: 2.0

Overall: 2.8

See all 18 ratings

Based on 1 vote. Vote

Surf Report Feed

Costellos Water Temperature and Wetsuit Guide

(New Hampshire, USA)

Today's Costellos sea temperature is 10.4 °C.

Statistics for 18 May (1981–2005) – mean: 9.3 °C, range: 7.6 °C to 11.3 °C

Don't be misled by the forecast of warm air temperatures at Costellos because the water temperature at Costellos is much colder (10 °C) than the air (22 °C) today. Surfers will need a decent quality spring wetsuit, gloves and boots and a hood if you expect to be duck-diving a lot. Feeling much more pleasant out of the water than in the sea today.

Below is a graph of Historical Sea Surface Temperature for Costellos. 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.

Costellos Water Temperature Graph

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

Costellos water temperatures peak in the range 18 to 22°C (64 to 72°F) on around the 10th of August and are at their coldest on about the 1st of March, in the range 2 to 4°C (36 to 39°F). The warmest Costellos water temperatures in early to mid August require something like a 3/2mm fully sealed wetsuit. The coldest water temperatures at Costellos mean that you will need a flexible 6/5/4mm wetsuit or a well fitting 5/4mm wetsuit with gloves and 5mm neoprene booties and a hood to surf here at the beginning of March.

Actual sea surface water temperatures close to shore at Costellos 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 Costellos. Refer to our detailed weather forecasts for this information.