September weather forecast
Ayem, Gabon

September

Weather in September

September introduces Ayem, Gabon to another phase in weather with a subtle shift towards more humidity and rainfall. There is a significant increase in rainfall volume from 68mm (2.68") of August to 146mm (5.75") in September. Despite the increased humidity, temperatures remain relatively stable, ensuring a consistent climate. Amidst the rainy days, the locals see more cloud cover, which affects the daytime illumination noticeably.

Temperature

Ayem's average high-temperature in September is a still warm 29.1°C (84.4°F), indicating a subtle variation from August. September in Ayem is noted for a mean low-temperature of 20.7°C (69.3°F).

Heat index

The heat index value for September is calculated to be a torrid 37°C (98.6°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The innate cooling system of the human body revolves around perspiration, with the evaporation of sweat being central to this process. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

In Ayem, the average relative humidity in September is 87%.

Rainfall

In Ayem, in September, it is raining for 26.1 days, with typically 146mm (5.75") of accumulated precipitation. In Ayem, during the entire year, the rain falls for 313.6 days and collects up to 1610mm (63.39") of precipitation.

Daylight

The month with the shortest days is September, with an average of 12h and 6min of daylight.
On the first day of the month, sunrise is at 06:11 and sunset at 18:17. On the last day of September, sunrise is at 06:00 and sunset at 18:07 WAT.

Sunshine

In Ayem, the average sunshine in September is 5.5h.

UV index

September and October, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily high UV index of 5 in September translates into this advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.

Frequently asked questions

Is it hot during September?
The high-temperature, in September, in Ayem, is 29.1°C (84.4°F), while the low-temperature averages to 20.7°C (69.3°F). In September, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, is calculated to be 37°C (98.6°F).
What is the average humidity in September?
In September, the average relative humidity is 87%.
How many days does it rain in September in Ayem?
In Ayem, Gabon, during September, the rain falls for 26.1 days and regularly aggregates up to 146mm (5.75") of precipitation.
What is the month with the shortest days?
September has the shortest days of the year, with an average of 12h and 6min of daylight.
How many hours of daylight does Ayem have in September?
In Ayem, the average day length in September is 12h and 7min.
When is the sunrise / sunset in September?
On the first day of September, sunrise is at 06:11 and sunset at 18:17. On the last day of the month, sunrise is at 06:00 and sunset at 18:07 WAT.
How long on average sun shines in September?
The average sunshine duration in September is 5.5h.
What is the month with the lowest UV index?
The months with the lowest UV index are September and October, with an average maximum UV index of 5.
What is the UV index reading in September?
In Ayem, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Ayem, Gabon
Average temperature in September
Ayem, Gabon
  • Average high temperature in September: 29.1°C

The warmest months (with the highest average high temperature) are January and March (31.8°C).
The month with the lowest average high temperature is October (28.6°C).

  • Average low temperature in September: 20.7°C

The month with the highest average low temperature is March (21.9°C).
The coldest month (with the lowest average low temperature) is July (20.1°C).

Average pressure in September - Ayem, Gabon
Average pressure in September
Ayem, Gabon
  • Average pressure in September: 1013mbar

The month with the highest atmospheric pressure is July (1013.9mbar).
The month with the lowest atmospheric pressure is February (1010.3mbar).

Average wind speed in September - Ayem, Gabon
Average wind speed in September
Ayem, Gabon
  • Average wind speed in September: 4.4km/h

The windiest month (with the highest average wind speed) is August (4.8km/h).
The calmest month (with the lowest average wind speed) is November (3.5km/h).

Average humidity in September - Ayem, Gabon
Average humidity in September
Ayem, Gabon
  • Average humidity in September: 87%

The month with the highest relative humidity is October (90%).
The month with the lowest relative humidity is January (81%).

Average rainfall in September - Ayem, Gabon
Average rainfall in September
Ayem, Gabon
  • Average rainfall in September: 146mm

The wettest month (with the highest rainfall) is October (238mm).
The driest month (with the least rainfall) is July (59mm).

Average rainfall days in September - Ayem, Gabon
Average rainfall days in September
Ayem, Gabon
  • Average rainfall days in September: 26.1 days

The month with the highest number of rainy days is March (30 days).
The month with the least rainy days is July (17.2 days).

Average daylight in September / Average sunshine in September - Ayem, Gabon
Average daylight in September /
Average sunshine in September
Ayem, Gabon
  • Average daylight in September: 12h and 1min

The month with the longest days is December (Average daylight: 12h and 6min).
The month with the shortest days is September (Average daylight: 12h and 6min).

  • Average sunshine in September: 5h and 3min

The month with the most sunshine is January (Average sunshine: 7h and 48min).
The month with the least sunshine is October (Average sunshine: 4h and 54min).

Average sunshine days in September - Ayem, Gabon
Average sunshine days in September
Ayem, Gabon
  • Average sunshine days in September: 3 days

The month with the most sunshine days is July (11.8 days).
The month with the least sunshine days is November (0.2 days).

Average UV index in September - Ayem, Gabon
Average UV index in September
Ayem, Gabon
  • Average UV index in September: 5

The month with the highest UV index is February (UV index 7).
The months with the lowest UV index are September and October (UV index 5).

Average cloud cover in September - Ayem, Gabon
Average cloud cover in September
Ayem, Gabon
  • Average cloud cover in September: 73

The month with the most cloud cover is October (Cloud cover 77).
The month with the least cloud cover is January (Cloud cover 54).

Average visibility in September - Ayem, Gabon
Average visibility in September
Ayem, Gabon
  • Average visibility in September: 6km

The months with the highest visibility are January, February, July, August and December (7km).
The months with the lowest visibility are May and October (5km).

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