Average Weather in August in Chilliwack Canada
The highest daily average high temperature is 79°F on August 3.
Daily low temperatures decrease by 3°F, from 57°F to 54°F, rarely falling below 48°F or exceeding 62°F. The highest daily average low temperature is 57°F on August 1.
For reference, on August 1, the hottest day of the year, temperatures in Chilliwack typically range from 57°F to 79°F, while on December 30, the coldest day of the year, they range from 33°F to 41°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in August
The month of August in Chilliwack experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 33% to 42%. The lowest chance of overcast or mostly cloudy conditions is 33% on August 4.
The clearest day of the month is August 4, with clear, mostly clear, or partly cloudy conditions 67% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 67%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Chilliwack, the chance of a wet day over the course of August is rapidly increasing, starting the month at 13% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 63% on November 18, and its lowest chance is 13% on August 6.
Probability of Precipitation in August
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during August in Chilliwack is increasing, starting the month at 1.2 inches, when it rarely exceeds 2.6 inches or falls below 0.2 inches, and ending the month at 2.1 inches, when it rarely exceeds 4.4 inches or falls below 0.3 inches.
The lowest average 31-day accumulation is 1.2 inches on August 1.
Average Monthly Rainfall in August
Over the course of August in Chilliwack, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 37 minutes, implying an average daily decrease of 3 minutes, 15 seconds, and weekly decrease of 22 minutes, 44 seconds.
The shortest day of the month is August 31, with 13 hours, 29 minutes of daylight and the longest day is August 1, with 15 hours, 7 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Chilliwack is 5:40 AM on August 1 and the latest sunrise is 43 minutes later at 6:22 AM on August 31.
The latest sunset is 8:47 PM on August 1 and the earliest sunset is 55 minutes earlier at 7:52 PM on August 31.
Daylight saving time is observed in Chilliwack during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:02 AM and sets 16 hours, 14 minutes later, at 9:16 PM, while on December 21, the shortest day of the year, it rises at 7:59 AM and sets 8 hours, 12 minutes later, at 4:12 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Chilliwack is gradually decreasing during August, falling from 4% to 1% over the course of the month.
The highest chance of a muggy day during August is 4% on August 4.
For reference, on August 4, the muggiest day of the year, there are muggy conditions 4% of the time, while on October 14, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in August
The average hourly wind speed in Chilliwack is essentially constant during August, remaining within 0.1 miles per hour of 2.9 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 4.4 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
The lowest daily average wind speed during August is 2.8 miles per hour on August 9.
Average Wind Speed in August
Wind Direction in August
Chilliwack is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Chilliwack is essentially constant during August, remaining within 1°F of 58°F throughout.
The highest average surface water temperature during August is 59°F on August 3.
Average Water Temperature in August
The growing season in Chilliwack typically lasts for 8.5 months (260 days), from around March 5 to around November 21, rarely starting before February 2 or after April 5, and rarely ending before October 31 or after December 22.
The month of August in Chilliwack is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in August
The average accumulated growing degree days in Chilliwack are increasing during August, increasing by 448°F, from 1,125°F to 1,573°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Chilliwack is decreasing during August, falling by 1.4 kWh, from 6.3 kWh to 4.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Chilliwack are 49.166 deg latitude, -121.953 deg longitude, and 43 ft elevation.
The topography within 2 miles of Chilliwack contains only modest variations in elevation, with a maximum elevation change of 318 feet and an average elevation above sea level of 45 feet. Within 10 miles contains only modest variations in elevation (5,499 feet). Within 50 miles also contains extreme variations in elevation (10,771 feet).
The area within 2 miles of Chilliwack is covered by artificial surfaces (37%), cropland (35%), and trees (20%), within 10 miles by trees (64%) and cropland (25%), and within 50 miles by trees (64%).
This report illustrates the typical weather in Chilliwack year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Chilliwack.
For each station, the records are corrected for the elevation difference between that station and Chilliwack according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Chilliwack is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Chilliwack and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .