Climate Overview
The climate in Sunyani is hot. The average annual temperature is 27°C and approximately 946mm of precipitation falls per year. September is the wettest month, receiving around 148mm of rainfall. Sunyani sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Sunyani sees moderate temperature variation throughout the year, ranging from 22°C to 36°C. February is the hottest month, with daytime highs reaching 36°C and an average of 30°C. December is the coolest month, with minimum temperatures around 22°C and an average of 27°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs.
Precipitation
Sunyani is a moderately rainy area, receiving approximately 946mm of precipitation annually, which averages out to around 79mm per month. The wettest month is September, averaging 148mm of rainfall. October and June also tend to see above-average precipitation. The driest month is January, with just 5mm. That's 143mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Sunyani is relatively calm, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 11km/h in winter, 13km/h in spring, 13km/h in summer, 10km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Sunyani, which began on March 20, 2026. Sunyani sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in February at around 36°C, while the coldest stretch bottoms out in December near 22°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 24 to 35°C. Precipitation is moderate at around 272mm for the season, averaging 91mm per month. Winds are generally light, averaging 13km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 30°C. Precipitation is moderate at around 275mm for the season, averaging 92mm per month. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 32°C. Rainfall is heavy, totalling around 354mm across the season with a monthly average of 118mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 22 to 36°C. Precipitation is minimal, with only around 46mm for the entire season. Winds are generally light, averaging 11km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Sunyani based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
