Climate and Average Weather Year Round in Niamey Niger
In Niamey, the wet season is hot, oppressive, and mostly cloudy and the dry season is sweltering and partly cloudy. Over the course of the year, the temperature typically varies from 63°F to 106°F and is rarely below 58°F or above 110°F.
Based on the beach/pool score, the best time of year to visit Niamey for hot-weather activities is from early November to early March.
Climate in Niamey
The hot season lasts for 2.3 months, from March 20 to May 31, with an average daily high temperature above 102°F. The hottest month of the year in Niamey is May, with an average high of 104°F and low of 84°F.
The cool season lasts for 1.6 months, from December 12 to January 30, with an average daily high temperature below 92°F. The coldest month of the year in Niamey is January, with an average low of 64°F and high of 90°F.
Average High and Low Temperature in Niamey
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 in Niamey
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
In Niamey, 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 Niamey begins around October 24 and lasts for 4.9 months, ending around March 20.
The clearest month of the year in Niamey is January, during which on average the sky is clear, mostly clear, or partly cloudy 68% of the time.
The cloudier part of the year begins around March 20 and lasts for 7.1 months, ending around October 24.
The cloudiest month of the year in Niamey is August, during which on average the sky is overcast or mostly cloudy 66% of the time.
Cloud Cover Categories in Niamey
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. The chance of wet days in Niamey varies very significantly throughout the year.
The wetter season lasts 3.1 months, from June 15 to September 18, with a greater than 37% chance of a given day being a wet day. The month with the most wet days in Niamey is August, with an average of 22.1 days with at least 0.04 inches of precipitation.
The drier season lasts 8.9 months, from September 18 to June 15. The month with the fewest wet days in Niamey is December, with an average of 0.0 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Niamey is August, with an average of 22.1 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 74% on August 4.
Daily Chance of Precipitation in Niamey
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 of the year. Niamey experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.1 months, from May 7 to October 11, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Niamey is August, with an average rainfall of 5.4 inches.
The rainless period of the year lasts for 6.9 months, from October 11 to May 7. The month with the least rain in Niamey is December, with an average rainfall of 0.0 inches.
Average Monthly Rainfall in Niamey
The length of the day in Niamey varies over the course of the year. In 2023, the shortest day is December 22, 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 in Niamey
The earliest sunrise is at 6:23 AM on June 1, and the latest sunrise is 56 minutes later at 7:19 AM on January 24. The earliest sunset is at 6:21 PM on November 21, and the latest sunset is 1 hour, 2 minutes later at 7:23 PM on July 9.
Daylight saving time (DST) is not observed in Niamey during 2023.
Sunrise & Sunset with Twilight in Niamey
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.
Solar Elevation and Azimuth in Niamey
The figure below presents a compact representation of key lunar data for 2023. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.
Moon Rise, Set & Phases in Niamey
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.
Niamey experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 6.0 months, from April 25 to October 26, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Niamey is August, with 30.6 days that are muggy or worse.
The month with the fewest muggy days in Niamey is January, with 0.0 days that are muggy or worse.
Humidity Comfort Levels in Niamey
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 Niamey experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 4.6 months, from November 22 to April 10, with average wind speeds of more than 8.2 miles per hour. The windiest month of the year in Niamey is January, with an average hourly wind speed of 10.3 miles per hour.
The calmer time of year lasts for 7.4 months, from April 10 to November 22. The calmest month of the year in Niamey is September, with an average hourly wind speed of 6.2 miles per hour.
Average Wind Speed in Niamey
The predominant average hourly wind direction in Niamey varies throughout the year.
The wind is most often from the south for 5.9 months, from April 20 to October 17, with a peak percentage of 63% on July 2. The wind is most often from the east for 6.1 months, from October 17 to April 20, with a peak percentage of 64% on January 1.
Wind Direction in Niamey
To characterize how pleasant the weather is in Niamey throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Niamey for general outdoor tourist activities is from mid December to late January, with a peak score in the first week of January.
Tourism Score in Niamey
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Niamey for hot-weather activities is from early November to early March, with a peak score in the first week of February.
Beach/Pool Score in Niamey
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Niamey 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 Niamey
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.
Growing Degree Days in Niamey
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 1.8 months, from March 8 to May 2, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest month of the year in Niamey is April, with an average of 6.7 kWh.
The darker period of the year lasts for 2.1 months, from July 19 to September 23, with an average daily incident shortwave energy per square meter below 5.5 kWh. The darkest month of the year in Niamey is August, with an average of 5.3 kWh.
Average Daily Incident Shortwave Solar Energy in Niamey
For the purposes of this report, the geographical coordinates of Niamey are 13.514 deg latitude, 2.110 deg longitude, and 676 ft elevation.
The topography within 2 miles of Niamey contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 674 feet. Within 10 miles also contains only modest variations in elevation (348 feet). Within 50 miles also contains only modest variations in elevation (463 feet).
The area within 2 miles of Niamey is covered by cropland (53%) and artificial surfaces (39%), within 10 miles by grassland (36%) and cropland (27%), and within 50 miles by grassland (44%) and cropland (34%).
This report illustrates the typical weather in Niamey, 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 Niamey.
For each station, the records are corrected for the elevation difference between that station and Niamey 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 Niamey is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Niamey and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Niamey and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .
Maps are © OpenStreetMap contributors.
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.
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