Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It is bordered to the southeast by Liberia and by Guinea to the north. Sierra Leone's land area is 73,252 km2 (28,283 sq mi). It has a tropical climate and environments ranging from savannas to rainforests.
Because it is so close to the equator, Sierra Leone has a tropical climate with constantly high temperatures and, throughout most of the year, high humidity.
Sierra Leone has a tropical climate with distinct wet and dry seasons.
Sierra Leone's climate context for the current climatology, 1991-2020, is derived from observed, historical data. Understanding the average ranges that characterize a selected climatology in each region is essential for planning in sectors such as agriculture, water resource management, and flood risk mitigation.
In Sierra Leone, the climate is tropical, hot all year round, with a dry season in winter and a rainy season due to the African monsoon, which runs from May to November in the north and from April to November in the south. Annual rainfall is considerable, from 2,000 to 3,000 millimeters (80 to 120 inches), with a maximum in the coastal area.
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Here's an overview of what to expect:
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Seasonal Variations
In this part of Africa the intertropical belt of cloud and rain migrates northwards and southwards with the apparent movement of the overhead sun but lagging behind by some four to six weeks.
Temperature, precipitation, and other climate dynamics change throughout a 12 month period. Understanding these patterns can help to identify local climate behavior and the potential for changing seasons over time.
From November to April, during the period of low sun, the weather is generally dry with many fine, hot, sunny days. The season of high sun, from May to October, is the rainy season. The rainfall increases to a peak in July and August and then decreases until rain has almost ceased by December.
The wet season starts in May and ends in November and is characterized by torrential rainfalls and high humidity. The dry season starts in December and ends in April, which includes harmattan, when cool, dry winds blow in off the Sahara Desert.
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Rainfall is highest in the coastal areas with annual downpour above 3500 mm and can be torrential during the months of July, August and September. Freetown receives the highest rainfall due to the proximity of the peninsula mountains.
The coast south of Freetown, flat and covered with mangroves, is often flooded in this period.
Temperatures are consistently high around the year on the coast and, during the dry season, rise even higher inland.
There is little variation in temperature throughout the year. However, it is cooler in the mountains of the northeast.
High temperatures inland are to some extend mitigated by the lower humidity. During the rainy season the coastal region is most uncomfortable because of the high relative humidity which rarely drops below 80% during the daytime. The combination of constant high temperature and humidity makes this an uncomfortable climate.
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The western part of the country is flat, while the eastern part is covered with hills and mountains; the highest peak is Mount Bintumani, 1,945 meters (6,381 feet) high. The altitude tempers the heat, especially above a thousand meters (3,300 feet).
Winter in Sierra Leone is hot and sunny: night-time temperatures are around 22/24 °C (72/75 °F) along the coast and 18/20 °C (64/68 °F) in the interior, while daytime temperatures are around 30 °C (86 °F) on the coast and 32/34 °C (90/93 °F) in the interior.
Sometimes, it can get uncomfortably hot: the temperature can reach 38/40 °C (100/104 °F) even in winter. Luckily, however, the air is quite dry because of the prevailing wind, the Harmattan.
This wind blows from the Sahara and lowers the humidity, especially in inland areas, and less frequently along the coast. On the contrary, during the night, the temperature can get a little cool, especially in inland areas, where it can drop to around 10 °C (50 °F), while in the mountains, it can even get cold.
Starting from February, the temperature rises, especially in the interior, and the hottest period of the year begins, which lasts until April or May, that is, when the rains arrive. Anyway, the first showers occur in March in the south: in Daru, already 90 millimeters (3.5 inches) of rain fall, and only 15 mm (0.6 in) in Freetown, in the center.
Rainfall increases gradually, reaching a peak from June to September, when it exceeds 250 mm (10 in) per month also in inland areas, while on the coast, the rains are more violent, and become torrential, especially in July and August.
Even the amount of sunshine in the summer months becomes very poor, since the rains occur almost daily. In the rainy season, the temperature often remains below 30 °C (86 °F) during the day, while it remains high at night, and the humidity makes the air quite sultry, even though, along the coast, the heat is tempered by the breeze.
Sunshine amounts are rather low on the coast, particularly during the wet season when they average two to three hours a day. These figures rise inland.
The sun in Freetown often shines from November to April, while in the rainy season, the sky is often cloudy, especially in the wettest period, from July to September. In inland areas, the sun shines a little more often.
Here is a table summarizing average temperatures and precipitation in Freetown:
| Month | Min Temp (°C) | Max Temp (°C) | Precipitation (mm) |
|---|---|---|---|
| Jan | 24 | 30 | 5 |
| Feb | 24 | 30 | 15 |
| Mar | 24 | 31 | 45 |
| Apr | 25 | 31 | 175 |
| May | 24 | 31 | 325 |
| Jun | 24 | 30 | 735 |
| Jul | 23 | 29 | 790 |
| Aug | 23 | 28 | 485 |
| Sep | 23 | 29 | 265 |
| Oct | 23 | 30 | 90 |
| Nov | 24 | 30 | 15 |
| Dec | 24 | 30 | 5 |
Freetown illustrates conditions around the year in the coastal districts of Sierra Leone.
The daily average high and low air temperature at 2 meters above the ground. The thin dotted lines are the corresponding perceived temperatures.
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
The percentage of time the sky is clear, mostly clear, or partly cloudy (i.e., less than 60% of the sky is covered by clouds).
The percentage of days in which precipitation is observed, excluding trace quantities. The average rainfall accumulated over the course of a sliding 31-day period centered on the day in question.
The number of hours during which the Sun is at least partly above the horizon. The percentage of time that is muggy, oppressive, or miserable (i.e., a dew point greater than 65°F).
The average of mean hourly wind speeds at 10 meters above the ground. The daily average wide-area surface water temperature.
The tourism score, which favors clear, rainless days with perceived temperatures between 65°F and 80°F. The beach/pool score, which favors clear, rainless days with perceived temperatures between 75°F and 90°F.
The percentage chance that a given day is within the growing season, defined 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).
The average daily shortwave solar energy reaching the ground per square meter.
Best Time to Visit
Due to less rain, the best time for traveling is from November to April. Most precipitation falls from June to October.
The best time to visit Sierra Leone is winter, in December and January in inland areas (because in February, it starts to get hot) and from December to March along the coast, where the temperature is more stable. The worst months are those of summer, from July to September, when the rains, often torrential, create extensive flooding.
Based on the beach/pool score, the best time of year to visit Freetown for hot-weather activities is from mid December to late March.
What to Wear
In winter: in Freetown and on the coast, bring light clothes, a light sweatshirt for the evening, and a scarf for the wind-borne sand and dust. In inland areas, it may be useful to bring a sweatshirt and a jacket for the evening.
In summer: bring tropics-friendly, loose-fitting clothing, a light sweatshirt and a light raincoat for the long and heavy downpours, and possibly an umbrella (which, however, is not really effective during the most intense rains). In inland areas and in the mountains, you can add a heavier sweatshirt for wet and rainy days.
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