Today's Ontonagon sea temperature is 13.2 °C
(4.3° warmer than normal for this time of year)
| Mean: | 8.9 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Range: | 5.7 °C to 16.1 °C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statistics for 11 Jul (1981–2005) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Today, many surfers would wear a spring wetsuit.
Don't be deceived by the very warm air temperatures as the water temperature at Ontonagon will be much cooler (13 °C). Most surfers would wear a good quality spring wetsuit. Cloudy, but feeling very pleasant out of the water.
 Map of current United States Surface Water Temperatures (based on measurements from oceanographic satellites) |  Map of current United States 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 Ontonagon. 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.
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.
Ontonagon sea temperatures peak in the range 12 to 19°C (54 to 66°F) on around the 14th of August and are at their lowest on about the 22nd of March, in the range 1 to 2°C (34 to 36°F). The warmest seasonal sea temperatures at Ontonagon in mid August lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots. The lowest sea temperatures at Ontonagon 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 in the second half of March.
Actual sea surface water temperatures close to shore at Ontonagon 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 Ontonagon. Refer to our detailed weather forecasts for this information.
Nearest