Sierra Leone Weather

Sierra Leone climate

Sierra Leone has a tropical monsoon climate with one of the wettest rainy seasons in West Africa. Freetown, the capital, receives an extraordinary 3,600mm of rainfall annually, with August alone averaging over 800mm as the monsoon reaches peak intensity. The mountainous Freetown Peninsula, rising steeply from the Atlantic coast, forces moist maritime air upward and amplifies rainfall through orographic effects.

The rainy season from May to November brings persistent heavy rainfall, high humidity, and frequent thunderstorms, while the dry season from December to April is dominated by the harmattan wind from the Sahara. Temperatures remain warm throughout the year, typically ranging from 23-33°C along the coast, with the dry season bringing slightly higher daytime temperatures. The interior experiences wider temperature variations, with cooler nights in the higher elevation areas near the Guinea border.

Sierra Leone's extreme rainfall makes it highly vulnerable to landslides and flash flooding, particularly in the densely populated hillsides surrounding Freetown. The devastating 2017 mudslide that killed over 1,000 people highlighted the critical need for weather monitoring and early warning systems. Weather Scope provides essential real-time radar and forecast data to help Sierra Leoneans track monsoon intensity, severe storms, and flooding risks throughout the rainy season.