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August Weather in Sarnia, Canada

Last updated: June 18, 2025

In August, the average temperature in Sarnia, Canada is a pleasant 22°C (72°F). It's worth noting that temperatures can range from a cool 12°C (54°F) to a warm 31°C (89°F). During this month, expect about 79 mm (3.1 in) of precipitation spread over approximately 11 days, with an average humidity of 80%. Prepare accordingly to make the most of your time in this beautiful location!

August Temperature in Sarnia

In August in Sarnia, the average temperature is 22°C (72°F). Maximums can reach 31°C (89°F), and minimums can be as low as 12°C (54°F). This makes Sarnia an ideal destination for travelers looking to enjoy mild and pleasant weather.

August Weather in Sarnia: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Sarnia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sarnia, August typically has an average temperature of 22°C (72°F), with highs reaching up to 31°C (89°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec262735445668737265544032
Data source: Temperature data for Sarnia generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Sarnia

In Sarnia in August, the total precipitation amount is 79 mm (3.1 in), falling over the course of 11 days.

August Precipitation Trends in Sarnia

The chart displays monthly precipitation patterns in Sarnia, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Sarnia, August typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec6166639597867379731067255
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Sarnia

In Sarnia in August humidity is 80%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket that can quickly sap your energy while traveling, making you feel sticky and uncomfortable if you're not prepared.

August Average Humidity in Sarnia

This chart illustrates the average monthly humidity levels in Sarnia, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Sarnia is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%85%86%80%80%80%81%80%84%90%86%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Sarnia

In Sarnia in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sarnia.

Maximum UV Index Levels in Sarnia for August

The chart shows the monthly maximum UV Index (UVI) for Sarnia in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Sarnia typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Sarnia August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Sarnia Compares to Other Months

Weather in Sarnia varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Sarnia, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sarnia, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)60 mm (2.4 inches)88%low
February Weather-3°C (28°F)66 mm (2.6 inches)87%moderate
March Weather1°C (35°F)63 mm (2.5 inches)85%moderate
April Weather7°C (45°F)95 mm (3.7 inches)86%very high
May Weather13°C (57°F)97 mm (3.8 inches)80%very high
June Weather20°C (68°F)86 mm (3.4 inches)80%very high
July Weather23°C (73°F)73 mm (2.9 inches)80%very high
August Weather22°C (72°F)79 mm (3.1 inches)80%very high
September Weather18°C (65°F)73 mm (2.9 inches)80%high
October Weather12°C (54°F)106 mm (4.2 inches)84%moderate
November Weather4°C (40°F)72 mm (2.8 inches)89%moderate
December Weather0°C (33°F)55 mm (2.2 inches)86%low

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