
The most detailed information about the water temperature in Sarnia in Large Lakes (Ontario, Canada). Forecast of changes in water temperature for the next 10 days. Statistics by months for recent years. Information about the neighboring resorts. Weather forecast in Sarnia for a week.
Water temperature in Sarnia right now
data updated 11 minutes ago53°F

yesterday: 53°F
a week ago: 47°F
Trend: slow rise
Today water temperature in Sarnia is 52.9°F. In general, this water temperature is unacceptable for swimming. But hardened people can afford to be in such water for 5-10 minutes. In any case, the general weather is also important. So, the air temperature at the same time will reach 51°F.
Analysis and forecast
The water temperature today roughly corresponds to the average value on this day in recent years. Its value has rise both over the past 20 days and over the past week. Exactly a year ago, on this day, the water temperature in this location was 59°F. Water temperature range in Sarnia in May is from 37 to 60 degrees.
According to our forecast, the water temperature in Sarnia will slowly rise for at least the next 10 days and reach a value of 55°F.
Table of water temperature values in Sarnia
Day | Fact* | Average** | Forecast*** |
May 21 | 10.7°C | 9.0°C | |
May 22 | 10.3°C | 9.5°C | |
May 23 | 11.0°C | 10.0°C | |
May 24 | 11.4°C | 10.3°C | |
May 25 | 11.4°C | 11.0°C | |
May 26 | 11.3°C | 11.0°C | |
May 27 | 11.7°C | 11.3°C | |
May 28 | 11.6°C | 11.0°C | |
May 29 | 11.0°C | 11.6°C | |
May 30 | 10.8°C | 11.4°C | |
May 31 | 11.3°C | 11.9°C | |
Jun 1 | 11.0°C | 11.6°C | |
Jun 2 | 10.5°C | 11.1°C | |
Jun 3 | 11.3°C | 11.9°C | |
Jun 4 | 11.0°C | 11.6°C |
** Average - Average water temperature on this day in past years
*** Forecast - Our forecast for the water temperature
Actual nearshore temperatures may vary by several degrees from the indicated values. This is noticeable after heavy rain or after prolonged periods of strong winds. Some downstream winds cause cold, deep waters to replace surface waters that have been warmed by the sun.
To develop a forecast, we use our own mathematical model, which takes into account the current change in water temperature, historical data and the main weather trends, wind strength and direction, air temperature in each specific region. We also take into account data for other resorts in Canada.

Annual graph of average water temperature change in Sarnia

Water temperature in Sarnia by month
Sarnia located in the northern hemisphere, at latitude 42 degrees. The comfortable water temperature for swimming is set here in July, usually at the beginning of the month. During a year in Sarnia there are 67 days of swimming. In general, the swimming season ends in September. Average annual water temperature on the coast in Sarnia is 50°F, by the seasons: in winter 36°F, in spring 38°F, in summer 67°F, in autumn 58°F. Minimum water temperature (32°F) in Sarnia it happens in February, maximum (74°F) in July.
You can find out detailed data on how the water temperature in Sarnia changes in each specific month:
Sarnia: general information and map
Neighboring cities and resorts
City | Water* | Distance** |
Port Huron | 52°C ![]() ![]() | 2km |
Fort Gratiot Township | 52°C ![]() ![]() | 9km |
Saint Clair | 52°C ![]() ![]() | 19km |
Marine City | 52°C ![]() ![]() | 30km |
Lexington | 53°C ![]() ![]() | 34km |
Algonac | 52°C ![]() ![]() | 41km |
Pearl Beach | 52°C ![]() ![]() | 42km |
New Baltimore | 53°C ![]() ![]() | 43km |
Mount Clemens | 52°C ![]() ![]() | 57km |
Lake St Clair | 54°C ![]() ![]() | 65km |
Saint Clair Shores | 53°C ![]() ![]() | 67km |
Detroit | 53°C ![]() ![]() | 89km |
** Straight line distance in kilometers

The warmest water today in Canada recorded in Windsor, its value is 54°F. Lowest - in Killiniq, there water temperature now 27°F. Average water temperature in the country today - 45°F.
Water temperature data in Sarnia and neighboring towns and resorts collected from various sources, using buoys, using satellite maps of sea, river and lake surfaces of the NOAA agency.
We use data from various local authorities in each specific location of the world to more accurately reflect temperature values.
The nearest airport is located in a 8 kilometers. This is Chris Hadfield (YZR) airport. We have no information as to whether it is valid and what flights it receives or sends.
Sarnia: weather forecast
The weather forecast is shown in local time in Sarnia


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