Sunyani climate — normals and trends
Sunyani (Ghana) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 26.1 °C and it receives 924 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is February (28.2 °C on average) and the coldest is August (24.4 °C). Rainfall peaks in September.
Sunyani averages 0 frost days, 222 hot days (≥ 30 °C) and 173 rainy days per year.
Sunyani has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The hottest day of the period reached 40.0 °C (on 6 March 2007) and the coldest 14.6 °C (on 28 December 1971).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SunyaniBono
- coords
- 7.34°, -2.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.1°C
Average daily high
30.9°C
Average daily low
22.5°C
Annual rainfall
924mm
Sunshine / day
8.9h
Mean relative humidity
75%
Average peak wind
11.9km/h
Seasonal range
3.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
222 d/yr
Rainy days (≥ 1 mm)
173 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.1 °C
Average feels-like low
25.6 °C
Average peak gust
27.5 km/h
Tropical nights (≥ 20 °C)
353 d/yr
Solar radiation
17.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.76 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.0 °C
6 March 2007
Coldest day
14.6 °C
28 December 1971
Wettest day
112 mm
5 October 1960
Windiest day
25.2 km/h
29 June 1988
Strongest gust
53.6 km/h
29 June 1988
Hottest feels-like
45.4 °C
16 March 2024
Coldest feels-like
11.5 °C
9 January 1957
Sunniest day
12.1 h
15 July 1946
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 35.8 °C | +2.7 °C | 0 mm | -16 mm |
| Feb | 36.7 °C | +2.5 °C | 27 mm | -16 mm |
| Mar | 35.2 °C | +1.8 °C | 48 mm | -42 mm |
| Apr | 34.2 °C | +1.8 °C | 51 mm | -56 mm |
| May | 32.9 °C | +1.5 °C | 95 mm | -5 mm |
| Jun | 31.1 °C | +1.6 °C | 77 mm | -21 mm |
| Jul | 28.9 °C | +0.8 °C | 26 mm | -56 mm |
| Aug | 28.2 °C | +0.3 °C | 30 mm | -46 mm |
| Sep | 30.1 °C | +1.4 °C | 109 mm | -9 mm |
| Oct | 30.7 °C | +1.1 °C | 134 mm | +17 mm |
| Nov | 32.2 °C | +1.6 °C | 22 mm | -34 mm |
| Dec | 32.4 °C | +0.8 °C | 26 mm | +4 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Sunyani?
Sunyani has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 26.1 °C and it receives 924 mm of precipitation per year.
What is the hottest day ever recorded in Sunyani?
The hottest day measured in Sunyani between 1940 and 2025 was 6 March 2007, reaching 40.0 °C.
What is the coldest day in Sunyani?
The coldest day measured in Sunyani between 1940 and 2025 was 28 December 1971, at 14.6 °C.
Does it snow in Sunyani?
Almost never: Sunyani sees virtually no snow, with about 0 frost days per year.
Has the climate of Sunyani warmed?
Yes: Sunyani warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sunyani?
The wettest day measured in Sunyani between 1940 and 2025 was 5 October 1960, with 112 mm of rain in 24 hours.
What was the windiest day in Sunyani?
The windiest day measured in Sunyani between 1940 and 2025 was 29 June 1988, with winds reaching 25.2 km/h.
What is the warmest month in Sunyani?
The warmest month in Sunyani is February (28.2 °C on average); the coldest is August (24.4 °C).
How much does it rain in Sunyani?
Sunyani receives on average 924 mm of precipitation per year, spread over about 173 rainy days.
Is it sunny in Sunyani?
Sunyani gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
Are there tropical nights in Sunyani?
Yes: Sunyani has on average 353 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sunyani?
In Sunyani, between 1940 and 2025, the highest apparent temperature reached 45.4 °C on 16 March 2024, and the lowest was 11.5 °C on 9 January 1957.
Compare Sunyani with another city
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Nearby cities
The climate around Sunyani