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Average Weather in Banjul Gambia

In Banjul, the temperature typically varies from 64°F to 95°F over the course of the year, and is rarely below 60°F or above 102°F.

The hot season lasts for 1.8 months, from February 11 to April 5, with an average daily high temperature above 93°F. The hottest day of the year is March 8, with an average high of 95°F and low of 68°F.

The cool season lasts for 2.3 months, from July 12 to September 22, with an average daily high temperature below 89°F. The coldest day of the year is January 11, with an average low of 64°F and high of 90°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, 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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothotcoolcool
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.

Sun

The length of the day in Banjul varies over the course of the year. In 2017, the shortest day is December 21, with 11 hours, 20 minutes of daylight; the longest day is June 21, with 12 hours, 55 minutes of daylight.

Hours of Daylight and Twilight

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 is at 6:38 AM on June 1, and the latest sunrise is 56 minutes later at 7:33 AM on January 23. The earliest sunset is at 6:35 PM on November 20, and the latest sunset is 1 hour, 2 minutes later at 7:37 PM on July 8.

Daylight saving time (DST) is not observed in Banjul during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. 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.

Clouds

In Banjul, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Banjul begins around November 14 and lasts for 7.5 months, ending around June 28. On May 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.

The cloudier part of the year begins around June 28 and lasts for 4.5 months, ending around November 14. On September 10, the cloudiest day of the year, the sky is overcast or mostly cloudy 81% of the time, and clear, mostly clear, or partly cloudy 19% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecSep 1081%Sep 1081%May 335%May 335%Nov 1458%Nov 1458%Jun 2858%Jun 2858%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
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

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Banjul varies very significantly throughout the year.

The wetter season lasts 3.0 months, from July 5 to October 4, with a greater than 40% chance of a given day being a wet day. The chance of a wet day peaks at 79% on August 27.

The drier season lasts 9.0 months, from October 4 to July 5. The smallest chance of a wet day is 0% on March 15.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 79% on August 27.

Daily Chance of Precipitation

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).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Banjul experiences very significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.0 months, from May 31 to October 31, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 22, with an average total accumulation of 9.3 inches.

The rainless period of the year lasts for 7.0 months, from October 31 to May 31. The least rain falls around April 6, with and average total accumulation of 0.0 inches.

Average Monthly Rainfall

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.

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.

Banjul experiences very significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 7.4 months, from April 23 to December 4, during which time the comfort level is muggy, oppressive, or miserable at least 26% of the time. The muggiest day of the year is September 3, with muggy conditions 100% of the time.

The least muggy day of the year is January 18, with muggy conditions 1% of the time.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 181%Jan 181%100%Sep 3100%Sep 3Apr 2326%Apr 2326%Dec 426%Dec 426%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Banjul experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 8.3 months, from December 3 to August 12, with average wind speeds of more than 3.8 miles per hour. The windiest day of the year is April 8, with an average hourly wind speed of 4.8 miles per hour.

The calmer time of year lasts for 3.7 months, from August 12 to December 3. The calmest day of the year is October 9, with an average hourly wind speed of 2.8 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Banjul varies throughout the year.

The wind is most often from the west for 5.7 months, from May 3 to October 24, with a peak percentage of 83% on June 18. The wind is most often from the north for 6.3 months, from October 24 to May 3, with a peak percentage of 73% on March 2.

Wind Direction

NNWWNN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
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

Banjul 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 4.7 months, from June 28 to November 19, with an average temperature above 81°F. The day of the year with the warmest water is October 18, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.9 months, from January 6 to May 4, with an average temperature below 72°F. The day of the year with the coolest water is March 2, with an average temperature of 69°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, 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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.8 months, from March 4 to May 30, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is April 13, with an average of 7.1 kWh.

The darker period of the year lasts for 3.4 months, from July 24 to November 5, with an average daily incident shortwave energy per square meter below 4.9 kWh. The darkest day of the year is September 28, with an average of 4.3 kWh.

Average Daily Incident Shortwave Solar Energy

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 Banjul are 13.453 deg latitude, -16.578 deg longitude, and 0 ft elevation.

The topography within 2 miles of Banjul is essentially flat, with a maximum elevation change of 66 feet, and an average elevation above sea level of 3 feet. Within 10 miles contains only modest variations in elevation (157 feet). Within 50 miles also contains only modest variations in elevation (243 feet).

The area within 2 miles of Banjul is covered by water (86%), within 10 miles by water (58%) and cropland (17%), and within 50 miles by water (45%) and cropland (22%).

Data Sources

This report illustrates the typical weather in Banjul, 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 Banjul.

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

The stations contributing to this reconstruction are: Banjul International Airport (92%, 15 kilometers, southwest), Kaolack Airport (6%, 96 kilometers, northeast), and Léopold Sédar Senghor International Airport (2.4%, 174 kilometers, northwest).

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 .