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August Weather in Fort St. John, Canada

Last updated: June 18, 2025

In August, the average temperature in Fort St. John, Canada hovers around 15°C (59°F). Visitors can expect a range from a chilly 1°C (34°F) to a warm 31°C (88°F). Be prepared for some rain, as 55 mm (2.2 in) of precipitation may fall over the course of 10 days. With an average humidity of 80%, it’s a good idea to stay hydrated and enjoy the refreshing atmosphere!

August Temperature in Fort St. John

In August in Fort St. John, the average temperature is 15°C (59°F), with maximums reaching up to 31°C (88°F) and minimums dropping as low as 1°C (34°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack layers for both warm and cool conditions.

August Weather in Fort St. John: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Fort St. John, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fort St. John, August typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (88°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec12921355158615949362114
Data source: Temperature data for Fort St. John 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 Fort St. John

In Fort St. John in August, the precipitation amount is 55 mm (2.2 in) spread over a duration of 10 days.

August Precipitation Trends in Fort St. John

The chart displays monthly precipitation patterns in Fort St. John, 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 Fort St. John, August typically receives around 55 mm (2.2 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec262632274181935546415022
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Fort St. John

In Fort St. John in August, humidity is 80%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making outdoor activities slightly uncomfortable and necessitating frequent breaks to stay hydrated.

August Average Humidity in Fort St. John

This chart illustrates the average monthly humidity levels in Fort St. John, 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 Fort St. John is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%94%89%86%82%80%83%80%83%87%91%95%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Fort St. John

In Fort St. John in August, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Fort St. John.

Maximum UV Index Levels in Fort St. John for August

The chart shows the monthly maximum UV Index (UVI) for Fort St. John 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 Fort St. John typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123577775311
Data source: Fort St. John 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 Fort St. John Compares to Other Months

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

This table compares monthly weather conditions in Fort St. John, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (12°F)26 mm (1.0 inches)94%low
February Weather-13°C (9°F)26 mm (1.0 inches)94%low
March Weather-6°C (22°F)31 mm (1.2 inches)89%moderate
April Weather2°C (35°F)27 mm (1.1 inches)86%moderate
May Weather10°C (51°F)41 mm (1.6 inches)82%high
June Weather15°C (59°F)81 mm (3.2 inches)80%high
July Weather16°C (61°F)93 mm (3.7 inches)83%high
August Weather15°C (59°F)55 mm (2.2 inches)80%high
September Weather9°C (49°F)46 mm (1.8 inches)83%moderate
October Weather2°C (37°F)41 mm (1.6 inches)86%moderate
November Weather-6°C (21°F)50 mm (2.0 inches)91%low
December Weather-10°C (15°F)22 mm (0.9 inches)95%low

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