Average Weather in August in Rainier Oregon, United States
Daily high temperatures decrease by 2°F, from 79°F to 77°F, rarely falling below 68°F or exceeding 91°F. The highest daily average high temperature is 80°F on August 3.
Daily low temperatures decrease by 3°F, from 56°F to 53°F, rarely falling below 46°F or exceeding 61°F. The highest daily average low temperature is 56°F on August 1.
For reference, on August 2, the hottest day of the year, temperatures in Rainier typically range from 56°F to 80°F, while on January 1, the coldest day of the year, they range from 35°F to 45°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 Rainier experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 22% to 31%. The lowest chance of overcast or mostly cloudy conditions is 22% on August 3.
The clearest day of the month is August 3, with clear, mostly clear, or partly cloudy conditions 78% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rainier, the chance of a wet day over the course of August is rapidly increasing, starting the month at 6% and ending it at 13%.
For reference, the year's highest daily chance of a wet day is 60% on November 18, and its lowest chance is 5% on August 3.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Rainier is increasing, starting the month at 0.5 inches, when it rarely exceeds 1.3 inches, and ending the month at 1.2 inches, when it rarely exceeds 2.7 inches or falls below 0.1 inches.
Average Monthly Rainfall in August
Over the course of August in Rainier, 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, 27 minutes, implying an average daily decrease of 2 minutes, 53 seconds, and weekly decrease of 20 minutes, 14 seconds.
The shortest day of the month is August 31, with 13 hours, 21 minutes of daylight and the longest day is August 1, with 14 hours, 47 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Rainier is 5:54 AM on August 1 and the latest sunrise is 37 minutes later at 6:31 AM on August 31.
The latest sunset is 8:41 PM on August 1 and the earliest sunset is 49 minutes earlier at 7:51 PM on August 31.
Daylight saving time is observed in Rainier 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 5:20 AM and sets 15 hours, 46 minutes later, at 9:06 PM, while on December 21, the shortest day of the year, it rises at 7:51 AM and sets 8 hours, 38 minutes later, at 4:28 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Rainier is essentially constant during August, remaining around 0% throughout.
For reference, on August 4, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, 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 Rainier is essentially constant during August, remaining around 3.6 miles per hour throughout.
For reference, on December 4, the windiest day of the year, the daily average wind speed is 5.0 miles per hour, while on August 24, the calmest day of the year, the daily average wind speed is 3.5 miles per hour.
The lowest daily average wind speed during August is 3.5 miles per hour on August 24.
Average Wind Speed in August
Wind Direction in August
Rainier 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 Rainier is essentially constant during August, remaining around 58°F throughout.
The highest average surface water temperature during August is 58°F on August 26.
Average Water Temperature in August
The growing season in Rainier typically lasts for 7.1 months (218 days), from around April 2 to around November 6, rarely starting before March 5 or after April 27, and rarely ending before October 15 or after December 4.
The month of August in Rainier 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 Rainier are increasing during August, increasing by 440°F, from 1,117°F to 1,557°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in Rainier is decreasing during August, falling by 1.4 kWh, from 6.9 kWh to 5.5 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 Rainier are 46.089 deg latitude, -122.936 deg longitude, and 16 ft elevation.
The topography within 2 miles of Rainier contains very significant variations in elevation, with a maximum elevation change of 899 feet and an average elevation above sea level of 225 feet. Within 10 miles contains very significant variations in elevation (1,972 feet). Within 50 miles contains large variations in elevation (8,284 feet).
The area within 2 miles of Rainier is covered by herbaceous vegetation (35%), trees (28%), and artificial surfaces (16%), within 10 miles by trees (51%) and shrubs (21%), and within 50 miles by trees (53%) and shrubs (24%).
This report illustrates the typical weather in Rainier 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Rainier.
For each station, the records are corrected for the elevation difference between that station and Rainier 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 Rainier is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rainier and a given station.
The stations contributing to this reconstruction are: Southwest Washington Regional Airport (94%, 4.5 kilometers, northeast); Scappoose Industrial Airpark (4.2%, 36 kilometers, south); and Clatsop County Airport (1.4%, 73 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .