September weather forecast
Sunyani, Ghana

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Weather in September

Month of September brings Sunyani into a period of transition. Rainfall peaks for the second time in the year at an astounding 112mm (4.41") turning the city into a fresh panorama. Temperatures drop slightly as the city prepares itself for the upcoming dry months. Skies seem to have their mainframe half replaced by clouds, causing the sunlight to play peek-a-boo through the day. This period is a soothing closing note to the rainy months as Sunyani steps into the anticipation of welcoming the dry season.

Temperature

Sunyani enters September with an average high-temperature of a still warm 28.9°C (84°F), mirroring August's climate. Sunyani encounters an average low-temperature of 21.1°C (70°F) during September nights.

Heat index

For most parts of September, the heat index is calculated to be a torrid 36°C (96.8°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.
When considering the heat index, it's pivotal to note it is for shade and mild wind conditions. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', shows a temperature sensation when both heat and moisture conditions are combined. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

With an average relative humidity of 89%, September is the most humid month.

Rainfall

In Sunyani, in September, it is raining for 25.3 days, with typically 112mm (4.41") of accumulated precipitation. Throughout the year, there are 211.3 rainfall days, and 716mm (28.19") of precipitation is accumulated.

Daylight

In Sunyani, the average length of the day in September is 12h and 10min.
On the first day of September, sunrise is at 06:01 and sunset at 18:16. On the last day of the month, sunrise is at 05:57 and sunset at 18:00 GMT.

Sunshine

In Sunyani, Ghana, the average sunshine in September is 5.6h.

UV index

In September, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the average person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.

Frequently asked questions

How hot does it get in September?

In September, the average high-temperature and low-temperature are 28.9°C (84°F) and 21.1°C (70°F) respectively. The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in September is calculated to be 36°C (96.8°F).

What is the most humid month?

September is the most humid month, with an average relative humidity of 89%.

What is the average humidity in September?

In Sunyani, the average relative humidity in September is 89%.

How much does it rain in September?

In Sunyani, during September, the rain falls for 25.3 days and regularly aggregates up to 112mm (4.41") of precipitation.

What is the average length of the day in September?

In Sunyani, the average day length in September is 12h and 10min.

When are sunrise and sunset in September?

On the first day of September, sunrise is at 06:01 and sunset at 18:16. On the last day of the month, sunrise is at 05:57 and sunset at 18:00 GMT.

How long on average sun shines in September?

In September, the average sunshine duration is 5.6h.

What is the UV index reading in September?

In Sunyani, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sunyani, Ghana

Average temperature in September - Sunyani, Ghana
  • Average high temperature in September: 28.9°C

The warmest month (with the highest average high temperature) is February (37°C).
The month with the lowest average high temperature is July (28.8°C).

  • Average low temperature in September: 21.1°C

The month with the highest average low temperature is March (23.4°C).
The coldest month (with the lowest average low temperature) is January (19.8°C).

Average pressure in September
Sunyani, Ghana

Average pressure in September - Sunyani, Ghana
  • Average pressure in September: 1012.9mbar

The month with the highest atmospheric pressure is July (1013.7mbar).
The months with the lowest atmospheric pressure are February and March (1009.5mbar).

Average wind speed in September
Sunyani, Ghana

Average wind speed in September - Sunyani, Ghana
  • Average wind speed in September: 6.1km/h

The windiest month (with the highest average wind speed) is April (7.8km/h).
The calmest month (with the lowest average wind speed) is December (5.4km/h).

Average humidity in September
Sunyani, Ghana

Average humidity in September - Sunyani, Ghana
  • Average humidity in September: 89%

The month with the highest relative humidity is September (89%).
The month with the lowest relative humidity is January (44%).

Average rainfall in September
Sunyani, Ghana

Average rainfall in September - Sunyani, Ghana
  • Average rainfall in September: 112mm

The wettest month (with the highest rainfall) is October (129mm).
The driest months (with the least rainfall) are January and December (4mm).

Average rainfall days in September
Sunyani, Ghana

Average rainfall days in September - Sunyani, Ghana
  • Average rainfall days in September: 25.3 days

The month with the highest number of rainy days is October (25.9 days).
The month with the least rainy days is January (3.6 days).

Average daylight in September /
Average sunshine in September
Sunyani, Ghana

Average daylight in September / Average sunshine in September - Sunyani, Ghana
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).

  • Average sunshine in September: 5h and 4min

The month with the most sunshine is January (Average sunshine: 9h and 48min).
The month with the least sunshine is August (Average sunshine: 5h and 24min).

Average sunshine days in September
Sunyani, Ghana

Average sunshine days in September - Sunyani, Ghana
  • Average sunshine days in September: 3.5 days

The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is October (2.9 days).

Average UV index in September
Sunyani, Ghana

Average UV index in September - Sunyani, Ghana
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, October, November and December (UV index 7).
The month with the lowest UV index is August (UV index 5).

Average cloud cover in September
Sunyani, Ghana

Average cloud cover in September - Sunyani, Ghana
  • Average cloud cover in September: 72

The month with the most cloud cover is September (Cloud cover 72).
The month with the least cloud cover is January (Cloud cover 13).

Average visibility in September
Sunyani, Ghana

Average visibility in September - Sunyani, Ghana
  • Average visibility in September: 6km

The months with the highest visibility are January and February (10km).
The months with the lowest visibility are June, July, September and October (6km).

Sunyani, Ghana

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