Climate and monthly weather forecastWaterloo, Sierra Leone

The climate of Waterloo

Waterloo, with its position in Sierra Leone, has a climate that is predominantly classified as a tropical monsoon or 'Am' under the Köppen climate classification. The location experiences high temperatures throughout the year, with the lowest average temperatures recorded at 23.9°C (75°F), and the maximum reaching up to 31.4°C (88.5°F).

An examination of the climate information reveals that relative humidity ranges between 68% in January and a peak of 86% in August. Notably, rainfall patterns exhibit a significant monsoonal pattern. Waterloo receives minimal rainfall at the start and end of the year, from 1mm (0.04") to 2mm (0.08") between January and February, and 7mm (0.28") in December, with an extreme augmentation from May to October. In these months, rainfall can reach an astonishing 391mm (15.39") and the area can experience rainfall as much as 30.3 days per month.

Sunshine hours and daylight hours display modest fluctuation throughout the year, from a minimum of 11.6 daylight hours and 4.8 sunshine hours to maximums of 12.6 daylight hours and 9.9 sunshine hours. An interesting weather pattern emerges in terms of cloud cover, which appears to mirror the rainfall cycle. A low of 11% cloud coverage increases substantially to 67% during high rainfall months.

The wind speed varies throughout the year, with the maximum gust measured at 18.4km/h (11.4mph), mostly occurring in the peak rainy season. It's associated with increased moisture levels and reduced visibility of 9km (5.6mi) from July to September when trade winds intensify.

The best time to visit Waterloo

With a detailed understanding of Waterloo's climate, potential visitors can make an informed decision about when to travel. The period from December to April offers a more favorable weather condition as these months record minimal rainfall varying between 1mm (0.04") and 18mm (0.71"). These months experience relatively low humidity levels, between 68% and 74%, making it comfortable for outdoor activities. During this period, visitors enjoy longer sunshine hours, ranging from 9.5 hours to 9.9 hours, and enhanced visibility up to 10km (6.2mi).

The worst time to visit Waterloo

In terms of unfavorable conditions, the months of June to September make up the height of the monsoon season, with close to constant rainfall and limited sunlight. The rainfall in these months ranges from 199mm (7.83") to 391mm (15.39"), and the city experiences only 4.8 hours to 6.6 hours of sunshine per day. Moreover, the humidity levels rise above 82%, which when coupled with high temperatures, might make this period uncomfortable for visitors not accustomed to such conditions.

Spring weather in Waterloo

Waterloo's tropical monsoon climate doesn't allow for a conventional spring season. However, in the March-April period—which would correspond to spring in a temperate zone—the city witnesses an upswing in the weather conditions. Temperatures range from 24.6°C (76.3°F) to 30.8°C (87.4°F). Rainfall begins to increase from 1mm (0.04") in February to 6mm (0.24") in March and further to 18mm (0.71") in April. Relative humidity also escalates, peaking at 74% in April.

Summer weather in Waterloo

Given Waterloo's equatorial positioning, it doesn't experience traditional summer months. However, for comparative purposes, the period of May to August would be the closest to a summer season. This period is marked by intense rainfall, with a peak of 391mm (15.39") in August. Temperatures range from 27.3°C (81.1°F) to 30.7°C (87.3°F) during these months, and relative humidity is above 78%.

Autumn weather in Waterloo

Similarly, Waterloo does not experience a distinct autumn season. However, the transition phase from the monsoon to the drier months, September to November, can be compared to autumn. September experiences the highest rainfall of 220mm (8.66") but it continuously decreases to 59mm (2.32") by November. Temperatures remain comparatively steady, between 28.1°C (82.6°F) and 30.1°C (86.2°F).

Winter weather in Waterloo

Waterloo’s geographical location near the equator means there is no identifiable winter season. However, the relatively cooler and drier phase from December to February can be compared to winter. Average temperatures are from 24.1°C (75.4°F) to 31.4°C (88.5°F). The city receives minimal rainfall dampening only 1 to 2 days per month, and relative humidity drops to a year-round low of 68% in January.

Weather in January

January in Waterloo, Sierra Leone, welcomes the New Year with one of the lowest levels of rainfall, measuring a mere 2mm (0.08"). Enjoy the outdoors as days are filled with ample sunshine, lasting 9.8 hours, and relatively low cloud coverage. Weather in January »

Weather in February

February marks a transition in Waterloo's climatic pattern. A comparison with January shows a dip in rainfall and an increase in temperature; however, this is not significant. Moderate wind speeds continue to contribute to refreshing weather, allowing enjoyable outdoor activities. Weather in February »

Weather in March

Waterloo's weather in March shifts considerably, reflecting the onset of a wet period. There is a noteworthy leap from 1mm (0.04") of rainfall in February to 6mm (0.24"). While daytime temperatures fluctuate slightly, nights become a bit cooler. Weather in March »

Weather in April

In Waterloo, April brings about a considerable transition from the rather dry first quarter, with rainfall reaching 18mm (0.71"). The increment in rainfall and relative humidity introduces a slightly muggy environment. Consistent cloud coverage ensures diffused daylight, influencing the outdoor temperatures. Weather in April »

Weather in May

Waterloo weather takes a turn in May, displaying a dramatic increase in rainfall levels, soaring up to 66mm (2.6"), creating a remarkably wet environment. Encouragingly, the increased moisture doesn't much affect the daylight hours, allowing ample time for outdoors before sundown. Weather in May »

Weather in June

Weather variations continue in June, with Waterloo experiencing its peak rainfall of 199mm (7.83"). The atmosphere becomes distinctly damp, owing to maximum relative humidity. There's a notable dip in sunshine hours; however, daylight remains almost unchanged. Weather in June »

Weather in July

July witnesses the highest rainfall of the year in Waterloo, with downpours reaching a significant 387mm (15.24"). This heavy rainfall takes place amidst falling temperatures, creating a cooler, damp environment. Despite this peak in rainfall, wind speeds remain relatively calm. Weather in July »

Weather in August

Entering August, Waterloo sees a slight decrement in rainfall, dropping to 391mm (15.39"), yet it remains one of the wettest months. The city experiences the year's highest relative humidity, making the atmosphere feel markedly humid. Weather in August »

Weather in September

In contrast to the preceding months, September brings a significant reduction in rainfall to Waterloo, measuring 220mm (8.66"). The weather begins to clear, with the number of sunshine hours beginning to rise while maintaining a steady daylight time. Weather in September »

Weather in October

October in Waterloo marks a further decline in rainfall, hitting 151mm (5.94"), setting a clear departure from the preceding wet months. Lower precipitation levels lead to increased sunshine hours, indicating brighter days ahead. Weather in October »

Weather in November

The weather in November portrays a stark departure from the typically wet months, with the rainfall in Waterloo dropping rapidly to 59mm (2.32"). The receding clouds offer more room for sunlight, leading to longer sunshine hours. Weather in November »

Weather in December

Waterloo's weather in December sees the year's lowest rainfall, merely 7mm (0.28"), distinctly contrasting the past high rainfall months. The decrease in cloud coverage allows for more bright, sunny hours despite the slight dip in daylight. Weather in December »