Koidu, Sierra Leone experiences average highs of 30°C (86°F) and lows of 22°C (72°F) throughout the year. Rainfall is frequent, averaging about 17 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.
Koidu, Sierra Leone Weather & Climate 2026
Monthly climate averages for Koidu, 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
5.1/10
Best: January, February, December
UV Index
7
High
Temperature 30°C / 22°C
Feels Like 34°C / 26°C
Rainy Days 17
Rainfall 204 mm
Sunshine 9 h
Humidity 77%
Wind Speed 10 km/h
Dew Point 22°C
Hottest Month
35°C
February
Avg Low22°C
Rain2days
Coldest Month
21°C
December
Avg High31°C
Rain3days
Driest Month
1days
January
Avg High33°C
Avg Low21°C
Windiest Month
13 km/h
March (Gusts 29)
Worst Time to Visit
Consider avoiding March, April, May, October due to extreme heat, heavy rainfall, oppressive humidity.
Sun Position
Sunrise 06:27
Daylight 12.6h
Sunset 19:04
Live conditions—
Koidu on the map · live conditions
Koidu, Sierra Leone
- Continent
- Africa
- Country
- Sierra Leone
- City
- Koidu
- Population
- 124.7K
- Coordinates
- 8.64°, -10.97°
Seasonal Breakdown
Spring
Mar–May
Avg High 32°C
Avg Low 24°C
Rain 15 days/mo
Summer
Jun–Aug
Avg High 27°C
Avg Low 22°C
Rain 29 days/mo
Autumn
Sep–Nov
Avg High 28°C
Avg Low 22°C
Rain 24 days/mo
Winter
Dec–Feb
Avg High 33°C
Avg Low 21°C
Rain 2 days/mo
3/3 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: 33°C / 21°C . Feb: 35°C / 22°C . Mar: 34°C / 24°C . Apr: 32°C / 24°C . May: 30°C / 23°C . Jun: 29°C / 22°C . Jul: 27°C / 22°C . Aug: 26°C / 21°C . Sep: 27°C / 22°C . Oct: 29°C / 22°C . Nov: 29°C / 22°C . Dec: 31°C / 21°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 3 mm. Feb: 10 mm. Mar: 47 mm. Apr: 87 mm. May: 187 mm. Jun: 306 mm. Jul: 416 mm. Aug: 455 mm. Sep: 491 mm. Oct: 311 mm. Nov: 128 mm. Dec: 11 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 56%. Feb: 54%. Mar: 63%. Apr: 74%. May: 83%. Jun: 86%. Jul: 89%. Aug: 90%. Sep: 89%. Oct: 88%. Nov: 85%. Dec: 71%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 10 km/h . Feb: 12 km/h . Mar: 13 km/h . Apr: 12 km/h . May: 10 km/h . Jun: 10 km/h . Jul: 11 km/h . Aug: 11 km/h . Sep: 10 km/h . Oct: 8 km/h . Nov: 7 km/h . Dec: 8 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 11h. Mar: 11h. Apr: 10h. May: 9h. Jun: 8h. Jul: 6h. Aug: 5h. Sep: 7h. Oct: 9h. Nov: 9h. Dec: 10h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 7. Feb: UV 8. Mar: UV 9. Apr: UV 8. May: UV 8. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 7. Oct: UV 8. Nov: UV 7. Dec: UV 7.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending wetter by about 37 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Feb 2025 · 36°C | Feb · 35°C |
| Coldest month | Dec 2025 · 21°C | Dec · 21°C |
| Wettest month | Sep 2025 · 635 mm | Sep · 491 mm |
| Windiest month | Mar 2025 · 14 km/h | Mar · 13 km/h |
Month-by-Month Weather Table
January best
Good 
February best
Good March
Poor April
Poor May
Wet June
Wet July
Wet August
Wet September
Wet October
Wet November
Fair December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 33°C / 21°C | 35°C / 23°C | 1days (3 mm) Excellent | 10.3h Excellent | 56% Moderate | 7.1 Very High | Good | View Details |
| February best | 35°C / 22°C | 37°C / 25°C | 2days (10 mm) Excellent | 10.6h Excellent | 54% Moderate | 8 Very High | Good | View Details |
| March | 34°C / 24°C | 38°C / 27°C | 9days (47 mm) Wet | 10.5h Excellent | 63% Muggy | 8.5 Very High | Poor | View Details |
| April | 32°C / 24°C | 37°C / 28°C | 13days (87 mm) Wet | 10.1h Excellent | 74% Muggy | 8.4 Very High | Poor | View Details |
| May | 30°C / 23°C | 36°C / 28°C | 22days (187 mm) Wet | 8.6h Good | 83% Humid | 7.8 Very High | Wet | View Details |
| June | 29°C / 22°C | 33°C / 26°C | 27days (306 mm) Wet | 7.9h Good | 86% Very Muggy | 7.3 Very High | Wet | View Details |
| July | 27°C / 22°C | 31°C / 25°C | 30days (416 mm) Wet | 6.3h Fair | 89% Very Muggy | 6.8 High | Wet | View Details |
| August | 26°C / 21°C | 30°C / 25°C | 29days (455 mm) Wet | 5.4h Fair | 90% Very Muggy | 6.6 High | Wet | View Details |
| September | 27°C / 22°C | 32°C / 25°C | 29days (491 mm) Wet | 7h Good | 89% Very Muggy | 7 High | Wet | View Details |
| October | 29°C / 22°C | 34°C / 26°C | 28days (311 mm) Wet | 8.9h Good | 88% Very Muggy | 7.5 Very High | Wet | View Details |
| November | 29°C / 22°C | 34°C / 26°C | 15days (128 mm) Wet | 9.4h Good | 85% Humid | 7.1 Very High | Fair | View Details |
| December best | 31°C / 21°C | 34°C / 24°C | 3days (11 mm) Excellent | 10.1h Excellent | 71% Muggy | 6.8 High | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Koidu are January, February, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Koidu, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Koidu is February, with average daytime highs of 35°C (95°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Koidu is December, with average overnight lows of 21°C (69°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Koidu is September, averaging 491mm of precipitation across 29 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Koidu runs through July, August, September, October, with the heaviest rainfall in July. Based on 10-year averages for Koidu.
Koidu receives approximately 105 sunshine hours per year. The sunniest month is February with around 11 hours. Based on climate data for Koidu.
The least favorable months to visit Koidu are March, April, May, October, primarily due to extreme heat, heavy rainfall, oppressive humidity. For the best conditions, consider January, February, December instead.
The annual average UV index in Koidu is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Koidu is 77%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Koidu are 10 km/h (6 mph). The windiest month is March with peak winds reaching 13 km/h (8 mph) (gusts up to 29 km/h / 18 mph).
Koidu averages 3 clear-sky days per month with overall cloud cover around 70%. The clearest skies occur in January.
The annual average dew point in Koidu is 22°C (72°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Koidu 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 Koidu ranges from 26°C (79°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 Koidu, with a climate score of 4.2/10. Consider visiting during January, February, December instead for better conditions.
For June in Koidu, pack Umbrella, Waterproof jacket, Waterproof shoes, Breathable clothing, Sunscreen (SPF 30+). With average highs of 29°C (83°F) and 27 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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