Climate averages 1991–2020
Sunyani weather
by month.
See how the year changes. February has the highest average daily maximum; January has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Sunyani averages a daytime high of 30.7°C and a nighttime low of 22.6°C, with about 932 mm of rain on roughly 168 days. February is the warmest month (average high 34.4°C) and August the coolest (27.8°C). September is the wettest month with 132 mm; January is the driest with 15 mm.
The annual picture
A year in Sunyani
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Sunyani climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 33.5°C21.9°C | 21.9°C | 15 | 3.0 | 11.712 h |
| February | 34.4°C23.4°C | 23.4°C | 36 | 6.1 | 11.912 h |
| March | 33.3°C23.9°C | 23.9°C | 86 | 14.6 | 12.112 h |
| April | 32.2°C23.8°C | 23.8°C | 100 | 16.4 | 12.312 h |
| May | 31.1°C23.5°C | 23.5°C | 98 | 18.3 | 12.512 h |
| June | 29.2°C22.5°C | 22.5°C | 102 | 19.1 | 12.513 h |
| July | 28.0°C21.8°C | 21.8°C | 83 | 16.4 | 12.513 h |
| August | 27.8°C21.7°C | 21.7°C | 91 | 16.9 | 12.412 h |
| September | 28.2°C21.9°C | 21.9°C | 132 | 22.0 | 12.212 h |
| October | 28.9°C22.1°C | 22.1°C | 116 | 21.1 | 12.012 h |
| November | 30.1°C22.2°C | 22.2°C | 57 | 10.9 | 11.812 h |
| December | 31.9°C21.8°C | 21.8°C | 18 | 3.4 | 11.712 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- BerekumGhana · 31 kmHigh 30.8°C · Low 22.5°C · 883 mm rain a year
- TechimanGhana · 51 kmHigh 30.7°C · Low 22.0°C · 1,216 mm rain a year
- JapekromGhana · 57 kmHigh 31.0°C · Low 22.7°C · 970 mm rain a year
- BondoukouIvory Coast · 94 kmHigh 31.0°C · Low 22.1°C · 1,106 mm rain a year
- KumasiGhana · 106 kmHigh 30.3°C · Low 22.7°C · 1,053 mm rain a year
- EjuraGhana · 107 kmHigh 32.1°C · Low 22.9°C · 976 mm rain a year
- AbengourouIvory Coast · 146 kmHigh 30.8°C · Low 22.8°C · 958 mm rain a year
- ObuaseGhana · 146 kmHigh 30.0°C · Low 22.8°C · 1,162 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC±0, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 7.30°, -2.30° (5 km from the city centre), adjusted down by 0.2°C for the difference between the city's elevation (298 m) and the cell's (274 m). Rain comes from the 0.25° cell at 7.25°, -2.25°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.