Koidu climate
Koidu (Sierra Leone) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 26 °C78 °F, and about 2,024 mm80 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Koidu climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 3391 | 1864 | 2578 | 10.0 |
| Feb | 3595 | 2069 | 2882 | 50.2 |
| Mar | 3595 | 2272 | 2983 | 130.5 |
| Apr | 3493 | 2373 | 2883 | 381.5 |
| May | 3289 | 2272 | 2781 | 1114.4 |
| Jun | 2984 | 2170 | 2577 | 30012 |
| Jul | 2780 | 2069 | 2475 | 45018 |
| Aug | 2679 | 2068 | 2374 | 52221 |
| Sep | 2781 | 2169 | 2475 | 36714 |
| Oct | 2883 | 2170 | 2576 | 1636.4 |
| Nov | 2985 | 2169 | 2577 | 491.9 |
| Dec | 3187 | 1865 | 2476 | 40.2 |
| Year | 3595 | 1864 | 2678 | 2,02480 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 52% | 32% | 5.3 | 11:40 |
| Feb | 54% | 40% | 5.6 | 11:50 |
| Mar | 59% | 54% | 5.7 | 12:03 |
| Apr | 63% | 67% | 5.5 | 12:18 |
| May | 75% | 79% | 5.1 | 12:31 |
| Jun | 84% | 80% | 4.6 | 12:37 |
| Jul | 89% | 86% | 4.3 | 12:35 |
| Aug | 91% | 88% | 4.3 | 12:24 |
| Sep | 90% | 87% | 4.7 | 12:09 |
| Oct | 87% | 80% | 5.0 | 11:55 |
| Nov | 80% | 64% | 5.0 | 11:43 |
| Dec | 65% | 41% | 5.1 | 11:37 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Koidu is like
The warmest month is March, with an average high of 35 °C95 °F and a low of 22 °C72 °F. The coldest is August, when highs average 26 °C79 °F and lows 20 °C68 °F. Seasonal differences are small — just 5.3 °C9.6 °F between the warmest and the coolest month.
It is very wet, receiving about 2,024 mm80 in of precipitation per year. The wettest three-month stretch is July–September, which brings 66% of the annual total. Months with less than 20 mm0.8 in on average: December–March. The wettest month is August (522 mm21 in), the driest is January (1 mm0.0 in).
Relative humidity ranges from 52% in January to 91% in August. The clearest skies (lowest average cloud amount, 32%) are typical of January. Average wind speed near the ground ranges from 4 km/h (3 mph) in November to 9 km/h (5 mph) in August. Daylight lasts from about 11.6 hours in December to 12.6 hours in June.
Best time to visit Koidu
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November and December: average highs of 29 °C85 °F to 31 °C87 °F with 4 mm0.2 in to 49 mm1.9 in of precipitation per month.
The most challenging month is August, which is very wet (522 mm21 in) and humid (91% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Koidu
- Wetter months (June–September) — highs 2679 to 29 °C84 °F, lows 2068 to 21 °C70 °F, about 410 mm16 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (October–May) — highs 2883 to 35 °C95 °F, lows 1864 to 23 °C73 °F, about 48 mm1.9 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
How Koidu compares
Compared with Kenema, about 89 km to the south, Koidu is on average 0.7 °C1.3 °F cooler and receives a similar amount of precipitation. The difference is largest in December (1.1 °C2 °F cooler).
Of the 4 places in Sierra Leone covered by World Climates, Koidu is the 4th warmest by annual mean temperature and the 2nd wettest by annual precipitation. See all of them on the Sierra Leone climate page.
Places in other countries with the most similar temperature and rainfall pattern: Kindia (Guinea, Am), Davangere (India, Aw) and Shivamogga (India, Aw).
Nearby places
- Kenema 89 km · 26 °C79 °F · 1,933 mm76 in
- Kissidougou 113 km · 25 °C76 °F · 1,744 mm69 in
- Bo 113 km · 26 °C80 °F · 1,938 mm76 in
- Freetown 250 km · 26 °C79 °F · 2,570 mm101 in
- Nzérékoré 257 km · 25 °C76 °F · 1,954 mm77 in
- Kindia 261 km · 25 °C78 °F · 2,847 mm112 in
- Monrovia 261 km · 27 °C80 °F · 1,718 mm68 in
- Kankan 266 km · 27 °C80 °F · 1,401 mm55 in
Frequently asked questions
What is the warmest month in Koidu?
March is the warmest month in Koidu, with an average high of 35 °C (95 °F) and an average low of 22 °C (72 °F).
What is the coldest month in Koidu?
August is the coldest month, with an average high of 26 °C (79 °F) and an average low of 20 °C (68 °F).
When does it rain the most in Koidu?
August is the wettest month with about 522 mm (20.5 in) of precipitation; January is the driest with about 1 mm (0.0 in).
What is the best time to visit Koidu?
Judging by long-term averages, the most comfortable months are November and December.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.