Average Weather in April in San Francisco Colombia
Daily high temperatures are around 72°F, rarely falling below 68°F or exceeding 75°F.
Daily low temperatures are around 59°F, rarely falling below 56°F or exceeding 61°F.
For reference, on June 17, the hottest day of the year, temperatures in San Francisco typically range from 58°F to 73°F, while on July 28, the coldest day of the year, they range from 57°F to 72°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
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
Kisoro, Uganda (7,312 miles away); Tongging, Indonesia (11,721 miles); and Topdac, Philippines (10,510 miles) are the far-away foreign places with temperatures most similar to San Francisco (view comparison).
The month of April in San Francisco experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 94% throughout the month.
The clearest day of the month is April 5, with clear, mostly clear, or partly cloudy conditions 7% of the time.
For reference, on May 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 97%, while on January 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 20%.
Cloud Cover Categories in April
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Francisco, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 77% and ending it at 86%.
For reference, the year's highest daily chance of a wet day is 89% on November 8, and its lowest chance is 61% on February 5.
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 San Francisco is very rapidly increasing, starting the month at 9.3 inches, when it rarely exceeds 13.9 inches or falls below 5.2 inches, and ending the month at 12.3 inches, when it rarely exceeds 17.6 inches or falls below 6.8 inches.
Average Monthly Rainfall in April
Over the course of April in San Francisco, the length of the day is essentially constant. The shortest day of the month is April 1, with 12 hours, 11 minutes of daylight and the longest day is April 30, with 12 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in San Francisco is 6:02 AM on April 1 and the earliest sunrise is 11 minutes earlier at 5:51 AM on April 30.
The latest sunset is 6:13 PM on April 1 and the earliest sunset is 2 minutes, 1 second earlier at 6:11 PM on April 26.
Daylight saving time is not observed in San Francisco during 2019.
For reference, on June 21, the longest day of the year, the Sun rises at 5:51 AM and sets 12 hours, 29 minutes later, at 6:20 PM, while on December 22, the shortest day of the year, it rises at 6:09 AM and sets 11 hours, 46 minutes later, at 5:55 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 San Francisco is essentially constant during April, remaining around 0% throughout.
For reference, on February 12, the muggiest day of the year, there are muggy conditions 0% of the time, while on August 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in April
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 San Francisco is essentially constant during April, remaining around 1.7 miles per hour throughout.
For reference, on October 24, the windiest day of the year, the daily average wind speed is 2.0 miles per hour, while on June 25, the calmest day of the year, the daily average wind speed is 1.6 miles per hour.
Average Wind Speed in April
Wind Direction 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 San Francisco 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
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
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 San Francisco are increasing during April, increasing by 412°F, from 1,221°F to 1,634°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 San Francisco is essentially constant during April, remaining within 0.2 kWh of 4.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of San Francisco are 6.117 deg latitude, -75.983 deg longitude, and 6,201 ft elevation.
The topography within 2 miles of San Francisco contains extreme variations in elevation, with a maximum elevation change of 4,019 feet and an average elevation above sea level of 6,199 feet. Within 10 miles also contains extreme variations in elevation (9,029 feet). Within 50 miles also contains extreme variations in elevation (12,982 feet).
The area within 2 miles of San Francisco is covered by trees (72%) and grassland (19%), within 10 miles by trees (71%) and grassland (13%), and within 50 miles by trees (68%) and grassland (15%).
This report illustrates the typical weather in San Francisco 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, José María Córdova International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Francisco.
At a distance of 62 kilometers from San Francisco, 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 San Francisco 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.
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.