Waterloo, Sierra Leone experiences average highs of 29°C (84°F) and lows of 25°C (77°F) throughout the year. Rainfall is frequent, averaging about 18 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. High humidity combined with warm temperatures produces a tropical feel year-round. Average highs have stayed broadly stable across the available records.
Waterloo, Sierra Leone Weather & Climate 2026
Monthly climate averages for Waterloo, Sierra Leone. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Oct At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.3/10
Best: January, February, March, July, August
UV Index
7
High
Temperature 29°C / 25°C
Feels Like 34°C / 30°C
Rainy Days 18
Rainfall 294 mm
Sunshine 9 h
Humidity 83%
Wind Speed 14 km/h
Dew Point 24°C
Hottest Month
31°C
February
Avg Low26°C
Rain2days
Coldest Month
24°C
August
Avg High27°C
Rain30days
Driest Month
2days
February
Avg High31°C
Avg Low26°C
Windiest Month
17 km/h
August (Gusts 33)
Sea Temperature
27°C – 30°C
Warmest water: May (
30.4°C
)
Worst Time to Visit
Consider avoiding May, October, November due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:36
Daylight 12.6h
Sunset 19:12
Live conditions—
Waterloo on the map · live conditions
Waterloo, Sierra Leone
- Continent
- Africa
- Country
- Sierra Leone
- City
- Waterloo
- Population
- 55K
- Coordinates
- 8.34°, -13.07°
Seasonal Breakdown
Spring
Mar–May
Avg High 30°C
Avg Low 26°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 25°C
Rain 30 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 28°C
Avg Low 25°C
Rain 27 days/mo
Winter
Dec–Feb
Avg High 30°C
Avg Low 26°C
Rain 5 days/mo
2/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 30°C / 26°C . Feb: 31°C / 26°C . Mar: 30°C / 26°C . Apr: 30°C / 26°C . May: 29°C / 26°C . Jun: 28°C / 25°C . Jul: 27°C / 24°C . Aug: 27°C / 24°C . Sep: 27°C / 24°C . Oct: 28°C / 25°C . Nov: 29°C / 25°C . Dec: 30°C / 26°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 10 mm. Feb: 10 mm. Mar: 14 mm. Apr: 46 mm. May: 189 mm. Jun: 500 mm. Jul: 840 mm. Aug: 799 mm. Sep: 693 mm. Oct: 264 mm. Nov: 129 mm. Dec: 38 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 78%. Feb: 78%. Mar: 78%. Apr: 79%. May: 83%. Jun: 86%. Jul: 87%. Aug: 88%. Sep: 88%. Oct: 87%. Nov: 85%. Dec: 80%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 14 km/h . Feb: 16 km/h . Mar: 16 km/h . Apr: 15 km/h . May: 13 km/h . Jun: 14 km/h . Jul: 17 km/h . Aug: 17 km/h . Sep: 15 km/h . Oct: 11 km/h . Nov: 10 km/h . Dec: 11 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 11h. May: 10h. Jun: 8h. Jul: 7h. Aug: 6h. Sep: 7h. Oct: 9h. Nov: 10h. Dec: 10h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 29°C . Feb: 30°C . Mar: 30°C . Apr: 30°C . May: 30°C . Jun: 30°C . Jul: 28°C . Aug: 27°C . Sep: 28°C . Oct: 29°C . Nov: 30°C . Dec: 30°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 8. Feb: UV 9. Mar: UV 9. Apr: UV 9. May: UV 7. Jun: UV 7. Jul: UV 6. Aug: UV 6. Sep: UV 7. Oct: UV 7. Nov: UV 8. Dec: UV 7.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 46 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jan 2025 · 31°C | Feb · 31°C |
| Coldest month | Aug 2025 · 24°C | Aug · 24°C |
| Wettest month | Jul 2025 · 892 mm | Jul · 840 mm |
| Windiest month | Aug 2025 · 18 km/h | Aug · 17 km/h |
Month-by-Month Weather Table
January best
Fair 
February best
Fair March best
Fair April
Poor May
Wet June
Wet July best
Wet August best
Wet September
Wet October
Wet November
Wet December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 30°C / 26°C | 36°C / 30°C | 3days (10 mm) Excellent | 10.2h Excellent | 78% Humid | 7.6 Very High | Fair | View Details |
| February best | 31°C / 26°C | 36°C / 30°C | 2days (10 mm) Excellent | 10.6h Excellent | 78% Humid | 8.6 Very High | Fair | View Details |
| March best | 30°C / 26°C | 36°C / 30°C | 4days (14 mm) Good | 11h Excellent | 78% Humid | 9 Very High | Fair | View Details |
| April | 30°C / 26°C | 36°C / 31°C | 9days (46 mm) Wet | 10.9h Excellent | 79% Humid | 8.7 Very High | Poor | View Details |
| May | 29°C / 26°C | 36°C / 31°C | 24days (189 mm) Wet | 9.8h Good | 83% Humid | 7.2 Very High | Wet | View Details |
| June | 28°C / 25°C | 34°C / 30°C | 29days (500 mm) Wet | 8.3h Good | 86% Very Muggy | 7 High | Wet | View Details |
| July best | 27°C / 24°C | 31°C / 28°C | 30days (840 mm) Wet | 6.8h Fair | 87% Very Muggy | 6 High | Wet | View Details |
| August best | 27°C / 24°C | 31°C / 28°C | 30days (799 mm) Wet | 6.3h Fair | 88% Very Muggy | 6.2 High | Wet | View Details |
| September | 27°C / 24°C | 32°C / 29°C | 29days (693 mm) Wet | 6.9h Fair | 88% Very Muggy | 6.8 High | Wet | View Details |
| October | 28°C / 25°C | 35°C / 30°C | 29days (264 mm) Wet | 8.9h Good | 87% Very Muggy | 7.4 Very High | Wet | View Details |
| November | 29°C / 25°C | 36°C / 31°C | 22days (129 mm) Wet | 10.1h Excellent | 85% Humid | 7.5 Very High | Wet | View Details |
| December | 30°C / 26°C | 36°C / 31°C | 9days (38 mm) Wet | 10.3h Excellent | 80% Humid | 7.4 Very High | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Waterloo are January, February, March, July, August, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Waterloo, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Waterloo is February, with average daytime highs of 31°C (87°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Waterloo is August, with average overnight lows of 24°C (76°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Waterloo is July, averaging 840mm of precipitation across 30 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Waterloo runs through July, August, June, September, with the heaviest rainfall in July. Based on 10-year averages for Waterloo.
Waterloo receives approximately 110 sunshine hours per year. The sunniest month is March with around 11 hours. Based on climate data for Waterloo.
The least favorable months to visit Waterloo are May, October, November, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider January, February, March, July, August instead.
The annual average UV index in Waterloo is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Waterloo is 83%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 29°C (84°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Waterloo are 14 km/h (9 mph). The windiest month is August with peak winds reaching 17 km/h (11 mph) (gusts up to 33 km/h / 20 mph).
Waterloo averages 3 clear-sky days per month with overall cloud cover around 66%. The clearest skies occur in January.
The annual average dew point in Waterloo is 24°C (75°F), which feels oppressively humid. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Waterloo has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Waterloo ranges from 30°C (86°F) to 34°C (93°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
June is not the best time to visit Waterloo, with a climate score of 3.9/10. Consider visiting during January, February, March, July, August instead for better conditions.
For June in Waterloo, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 28°C (83°F) and 29 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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