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Average Weather in July in Cascade Locks Oregon, United States

In Cascade Locks, the month of July is characterized by rising daily high temperatures, with daily highs increasing by 5°F, from 79°F to 84°F over the course of the month, and rarely exceeding 96°F or dropping below 67°F.

Daily low temperatures increase by 3°F, from 57°F to 60°F, rarely falling below 51°F or exceeding 65°F. The highest daily average low temperature is 60°F on July 31.

For reference, on August 4, the hottest day of the year, temperatures in Cascade Locks typically range from 60°F to 84°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 July

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July

Average Hourly Temperature in July in Cascade Locks18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJunAugwarmcoldcoolcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.


The month of July in Cascade Locks experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 39% to 22%.

The clearest day of the month is July 29, with clear, mostly clear, or partly cloudy conditions 78% of the time.

For reference, on December 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, 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 July

Cloud Cover Categories in July in Cascade Locks1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 161%Jul 161%Jul 3178%Jul 3178%Jul 1169%Jul 1169%Jul 2176%Jul 2176%clearovercastmostly clearpartly cloudymostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cascade Locks, the chance of a wet day over the course of July is very rapidly decreasing, starting the month at 14% and ending it at 6%.

For reference, the year's highest daily chance of a wet day is 62% on November 27, and its lowest chance is 5% on August 4.

Probability of Precipitation in July

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).


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 July in Cascade Locks is decreasing, starting the month at 1.1 inches, when it rarely exceeds 2.0 inches or falls below 0.2 inches, and ending the month at 0.4 inches, when it rarely exceeds 1.2 inches.

The lowest average 31-day accumulation is 0.4 inches on July 29.

Average Monthly Rainfall in July

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.


Over the course of July in Cascade Locks, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 52 minutes, implying an average daily decrease of 1 minute, 43 seconds, and weekly decrease of 12 minutes, 2 seconds.

The shortest day of the month is July 31, with 14 hours, 47 minutes of daylight and the longest day is July 1, with 15 hours, 38 minutes of daylight.

Hours of Daylight and Twilight in July

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Cascade Locks is 5:22 AM on July 1 and the latest sunrise is 28 minutes later at 5:50 AM on July 31.

The latest sunset is 9:00 PM on July 1 and the earliest sunset is 24 minutes earlier at 8:36 PM on July 31.

Daylight saving time is observed in Cascade Locks during 2017, but it neither starts nor ends during July, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:18 AM and sets 15 hours, 43 minutes later, at 9:00 PM, while on December 21, the shortest day of the year, it rises at 7:45 AM and sets 8 hours, 41 minutes later, at 4:26 PM.

Sunrise & Sunset with Twilight in July

The solar day over the course of July. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.


We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Cascade Locks is essentially constant during July, remaining around 1% throughout.

For reference, on August 3, the muggiest day of the year, there are muggy conditions 1% 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 July

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.


This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Cascade Locks is essentially constant during July, remaining within 0.1 miles per hour of 3.9 miles per hour throughout.

For reference, on December 29, the windiest day of the year, the daily average wind speed is 5.5 miles per hour, while on August 12, the calmest day of the year, the daily average wind speed is 3.8 miles per hour.

Average Wind Speed in July

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Cascade Locks throughout July is predominantly from the west, with a peak proportion of 84% on July 18.

Wind Direction in July

Wind Direction in July in Cascade Locks1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugwesteast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Cascade Locks is essentially constant during July, remaining within 0.1 kWh of 7.3 kWh throughout.

The highest average daily incident shortwave solar energy during July is 7.4 kWh on July 21.

Average Daily Incident Shortwave Solar Energy in July

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.


For the purposes of this report, the geographical coordinates of Cascade Locks are 45.670 deg latitude, -121.891 deg longitude, and 459 ft elevation.

The topography within 2 miles of Cascade Locks contains large variations in elevation, with a maximum elevation change of 3,241 feet and an average elevation above sea level of 494 feet. Within 10 miles contains large variations in elevation (4,941 feet). Within 50 miles also contains extreme variations in elevation (12,270 feet).

The area within 2 miles of Cascade Locks is covered by trees (55%), water (35%), and artificial surfaces (10%), within 10 miles by trees (77%) and shrubs (15%), and within 50 miles by trees (50%) and shrubs (28%).

Data Sources

This report illustrates the typical weather in Cascade Locks 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 Cascade Locks.

For each station, the records are corrected for the elevation difference between that station and Cascade Locks 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 Cascade Locks is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cascade Locks and a given station.

The stations contributing to this reconstruction are: Portland–Troutdale Airport (59%, 42 kilometers, west) and The Dalles Municipal Airport (41%, 57 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.


The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.