Climate averages 1991–2020
Sunyani weather
in September.
A hot, wet month: the 10th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Sunyani: daytime highs average 28.2°C and nights cool to about 21.9°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 132 mm of rain on roughly 22 days, which makes September a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 10 min on an average September day.
The nearest other city in this atlas is Berekum (31 km away). In September its highs average 28.2°C, about as warm as Sunyani, with 131 mm of rain.
Among the 26 cities listed in Ghana, Sunyani ranks joint 12th of 26 for the warmest September highs and 12th of 26 for the driest September (rainfall, lowest first). The mean September high of those 26 cities is 28.2°C; Sunyani is 0.1°C warmer than that mean.
From September to October, average highs rise by 0.6°C to 28.9°C, and monthly rainfall falls from 132 mm to 116 mm.
The annual picture
September in context
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, selected | 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
September in nearby cities
- Berekum in SeptemberGhana · 31 kmHigh 28.2°C · Low 21.9°C · 131 mm rain
- Techiman in SeptemberGhana · 51 kmHigh 28.2°C · Low 21.4°C · 181 mm rain
- Japekrom in SeptemberGhana · 57 kmHigh 28.5°C · Low 22.1°C · 142 mm rain
- Bondoukou in SeptemberIvory Coast · 94 kmHigh 28.6°C · Low 21.5°C · 185 mm rain
- Kumasi in SeptemberGhana · 106 kmHigh 28.2°C · Low 22.0°C · 141 mm rain
- Ejura in SeptemberGhana · 107 kmHigh 29.7°C · Low 22.2°C · 174 mm rain
- Abengourou in SeptemberIvory Coast · 146 kmHigh 28.9°C · Low 22.2°C · 126 mm rain
- Obuase in SeptemberGhana · 146 kmHigh 28.3°C · Low 22.2°C · 136 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Sunyani) is explained once on the Sunyani year overview and on the Sources, method and limits page.