Average Weather in April in Cape Town South Africa
Daily low temperatures decrease by 4°F, from 58°F to 54°F, rarely falling below 48°F or exceeding 63°F.
For reference, on January 27, the hottest day of the year, temperatures in Cape Town typically range from 63°F to 76°F, while on July 11, the coldest day of the year, they range from 48°F to 62°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Cape Town experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 28% to 38%.
The clearest day of the month is April 1, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on May 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on February 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cape Town, the chance of a wet day over the course of April is rapidly increasing, starting the month at 10% and ending it at 17%.
For reference, the year's highest daily chance of a wet day is 27% on June 15, and its lowest chance is 4% on February 13.
Probability of Precipitation in April
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 April in Cape Town is increasing, starting the month at 1.0 inches, when it rarely exceeds 2.2 inches or falls below 0.1 inches, and ending the month at 1.6 inches, when it rarely exceeds 3.6 inches or falls below 0.3 inches.
Average Monthly Rainfall in April
Over the course of April in Cape Town, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 57 minutes, implying an average daily decrease of 1 minute, 57 seconds, and weekly decrease of 13 minutes, 41 seconds.
The shortest day of the month is April 30, with 10 hours, 46 minutes of daylight and the longest day is April 1, with 11 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in April
The earliest sunrise of the month in Cape Town is 6:58 AM on April 1 and the latest sunrise is 22 minutes later at 7:20 AM on April 30.
The latest sunset is 6:41 PM on April 1 and the earliest sunset is 35 minutes earlier at 6:06 PM on April 30.
Daylight saving time is not observed in Cape Town during 2018.
For reference, on December 21, the longest day of the year, the Sun rises at 5:31 AM and sets 14 hours, 25 minutes later, at 7:56 PM, while on June 21, the shortest day of the year, it rises at 7:51 AM and sets 9 hours, 54 minutes later, at 5:44 PM.
Sunrise & Sunset with Twilight in April
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 Cape Town is essentially constant during April, remaining within 1% of 1% throughout.
For reference, on February 11, the muggiest day of the year, there are muggy conditions 9% of the time, while on May 25, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
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 Cape Town is decreasing during April, decreasing from 11.7 miles per hour to 10.6 miles per hour over the course of the month.
For reference, on January 22, the windiest day of the year, the daily average wind speed is 13.9 miles per hour, while on May 3, the calmest day of the year, the daily average wind speed is 10.5 miles per hour.
Average Wind Speed in April
Wind Direction in April
Cape Town 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 Cape Town is gradually decreasing during April, falling by 2°F, from 63°F to 61°F, over the course of the month.
Average Water Temperature in April
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 Cape Town 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 April
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 Cape Town are increasing during April, increasing by 371°F, from 3,604°F to 3,974°F, over the course of the month.
Growing Degree Days in April
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 Cape Town is rapidly decreasing during April, falling by 1.6 kWh, from 5.3 kWh to 3.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Cape Town are -33.926 deg latitude, 18.423 deg longitude, and 82 ft elevation.
The topography within 2 miles of Cape Town contains large variations in elevation, with a maximum elevation change of 2,405 feet and an average elevation above sea level of 318 feet. Within 10 miles contains large variations in elevation (3,596 feet). Within 50 miles also contains extreme variations in elevation (6,568 feet).
The area within 2 miles of Cape Town is covered by artificial surfaces (69%) and shrubs (20%), within 10 miles by water (46%) and artificial surfaces (39%), and within 50 miles by water (62%) and cropland (22%).
This report illustrates the typical weather in Cape Town 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 Cape Town.
For each station, the records are corrected for the elevation difference between that station and Cape Town 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 Cape Town is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cape Town and a given station.
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.
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.