nomadseason

April Weather in Sarnia, Canada

Last updated: June 18, 2025

In April, the average temperature in Sarnia, Canada hovers around 7°C (45°F), making it a cool time of year. Expect minimums to dip as low as -5°C (24°F) and maximums to reach a pleasant 25°C (77°F). With 95 mm (3.7 in) of precipitation spread over 14 days, you might want to keep an umbrella handy. The region also boasts a high average humidity of 86%, contributing to a unique climate experience.

April Temperature in Sarnia

In April in Sarnia, the average temperature is 7°C (45°F), with maximums reaching up to 25°C (77°F) and minimums dipping as low as -5°C (24°F). This variation makes it essential for travelers to pack layers and be prepared for both warmer days and chilly nights.

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

The chart illustrates April 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, April typically has an average temperature of 7°C (45°F), with highs reaching up to 25°C (77°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec262735445668737265544032
Data source: Temperature data for Sarnia generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

April Precipitation in Sarnia

In Sarnia in April, the total precipitation amount is 95 mm (3.7 in), spread over 14 days.

April Precipitation Trends in Sarnia

The chart displays monthly precipitation patterns in Sarnia, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Sarnia, April typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec6166639597867379731067255
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

April Humidity in Sarnia

In Sarnia in April, humidity is 86%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration a bit uncomfortable and necessitating cozy layers to stay warm while navigating the moist air.

April Average Humidity in Sarnia

This chart illustrates the average monthly humidity levels in Sarnia, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Sarnia is approximately 86%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Sarnia

In Sarnia in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Sarnia.

Maximum UV Index Levels in Sarnia for April

The chart shows the monthly maximum UV Index (UVI) for Sarnia in April, 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 April, the maximum UV index in Sarnia typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Sarnia April 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 April 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 April’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 April’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

Compare Sarnia's Climate with Cities Worldwide