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Average Weather in July in Walvis Bay Namibia

In Walvis Bay, the month of July is characterized by gradually falling daily high temperatures, with daily highs decreasing by 3°F, from 70°F to 67°F over the course of the month, and rarely exceeding 86°F or dropping below 57°F. The highest daily average high temperature is 70°F on July 1.

Daily low temperatures decrease by 2°F, from 52°F to 50°F, rarely falling below 45°F or exceeding 61°F.

For reference, on April 5, the hottest day of the year, temperatures in Walvis Bay typically range from 57°F to 71°F, while on August 17, the coldest day of the year, they range from 50°F to 66°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 Walvis Bay18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJunAugcoldcoolcomfortable
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.

Clouds

The month of July in Walvis Bay experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 9% throughout the month.

The clearest day of the month is July 23, with clear, mostly clear, or partly cloudy conditions 92% of the time.

For reference, on January 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 28%, while on May 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 93%.

Cloud Cover Categories in July

Cloud Cover Categories in July in Walvis Bay1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugJul 191%Jul 191%Jul 3191%Jul 3191%Jul 1191%Jul 1191%Jul 2192%Jul 2192%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.

Precipitation

Sun

Over the course of July in Walvis Bay, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 19 minutes, implying an average daily increase of 38 seconds, and weekly increase of 4 minutes, 25 seconds.

The shortest day of the month is July 1, with 10 hours, 45 minutes of daylight and the longest day is July 31, with 11 hours, 4 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 latest sunrise of the month in Walvis Bay is 6:43 AM on July 4 and the earliest sunrise is 7 minutes earlier at 6:36 AM on July 31.

The earliest sunset is 5:28 PM on July 1 and the latest sunset is 12 minutes later at 5:40 PM on July 31.

Daylight saving time is observed in Walvis Bay during 2017, but it neither starts nor ends during July, so the entire month is in standard time.

For reference, on December 21, the longest day of the year, the Sun rises at 6:13 AM and sets 13 hours, 33 minutes later, at 7:46 PM, while on June 21, the shortest day of the year, it rises at 6:42 AM and sets 10 hours, 43 minutes later, at 5:25 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.

Humidity

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 Walvis Bay is essentially constant during July, remaining around 0% throughout.

For reference, on February 21, the muggiest day of the year, there are muggy conditions 9% of the time, while on July 20, 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.

Wind

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 Walvis Bay is essentially constant during July, remaining within 0.2 miles per hour of 9.3 miles per hour throughout.

For reference, on July 14, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on March 13, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.

The highest daily average wind speed during July is 9.5 miles per hour on July 15.

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 Walvis Bay throughout July is predominantly from the south, with a peak proportion of 56% on July 31.

Wind Direction in July

Wind Direction in July in Walvis Bay1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugsoutheastwestnorth
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).

Water Temperature

Walvis Bay 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 Walvis Bay is essentially constant during July, remaining around 57°F throughout.

Average Water Temperature in July

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Walvis Bay are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in July

Time Spent in Various Temperature Bands and the Growing Season in July in Walvis Bay1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16100%Jul 3100%Jul 3coldcoolcomfortablewarm
The percentage of time spent in various temperature 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 black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Walvis Bay is increasing during July, increasing by 199°F, from 89°F to 288°F, over the course of the month.

Growing Degree Days in July

The average growing degree days accumulated over the course of July, with 25th to 75th and 10th to 90th percentile bands.

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 Walvis Bay is gradually increasing during July, rising by 0.5 kWh, from 4.5 kWh to 5.0 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in July

Average Daily Incident Shortwave Solar Energy in July in Walvis Bay1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWh4.5 kWh5.0 kWh5.5 kWh6.0 kWh6.5 kWhJunAugJul 14.5 kWhJul 14.5 kWhJul 315.0 kWhJul 315.0 kWhJul 114.6 kWhJul 114.6 kWhJul 214.8 kWhJul 214.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Walvis Bay are -22.958 deg latitude, 14.505 deg longitude, and 13 ft elevation.

The topography within 2 miles of Walvis Bay contains only modest variations in elevation, with a maximum elevation change of 125 feet and an average elevation above sea level of 15 feet. Within 10 miles also contains only modest variations in elevation (377 feet). Within 50 miles contains only modest variations in elevation (2,884 feet).

The area within 2 miles of Walvis Bay is covered by sparse vegetation (40%), bare soil (25%), grassland (17%), and water (16%), within 10 miles by bare soil (49%) and water (39%), and within 50 miles by water (48%) and bare soil (46%).

Data Sources

This report illustrates the typical weather in Walvis Bay 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 is only a single weather station, Walvis Bay Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Walvis Bay.

At a distance of 15 kilometers from Walvis Bay, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Walvis Bay according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

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.

Disclaimer

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.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.