September weather forecastNdende, Gabon
September
Weather in September
September brings a moderate increase in rainfall in Ndende, reaching up to 44mm (1.73"), indicating the end of the naive dry spell. The number of sunshine days begins to dip, and the city prepares for the forthcoming rainy season. Cloud density goes up a notch, painting the cityscape with regular grey hues. Despite the onset of rain, the overall weather remains balanced, allowing inhabitants to carry on with their day-to-day lives. Even as the weather inclines towards being damp, there's something about the September air that brings along an enchanting freshness.Temperature
September's weather records an average high-temperature of a warm 29.3°C (84.7°F), showing little deviation from August. An average nighttime temperature of 21.2°C (70.2°F) is observed during September.Heat index
September's average heat index is evaluated at a torrid 35°C (95°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.Be aware that heat index ratings are designed for shaded locations and minor breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', provides an understanding of perceived warmth by combining temperature and relative humidity. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Young ones often underestimate the need for rest and rehydration. Thirst appears late in dehydration - hence, it is important to keep hydrated, particularly during prolonged physical activities.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
In September, the average relative humidity is 77%.Rainfall
In Ndende, in September, it is raining for 18.1 days, with typically 44mm (1.73") of accumulated precipitation. In Ndende, during the entire year, the rain falls for 274.1 days and collects up to 1640mm (64.57") of precipitation.Daylight
In September, the average length of the day is 12h and 6min.On the first day of September, sunrise is at 06:12 and sunset at 18:16. On the last day of the month, sunrise is at 06:00 and sunset at 18:08 WAT.
Sunshine
The average sunshine in September is 4.9h.UV index
The months with the highest UV index are January through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 6 in September translates into this advice:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ndende, Gabon
- Average high temperature in September: 29.3°C
The warmest month (with the highest average high temperature) is March (30.6°C).
The month with the lowest average high temperature is November (28.3°C).
- Average low temperature in September: 21.2°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 (18.6°C).
Average pressure in September
Ndende, Gabon
- Average pressure in September: 1013.2mbar
The month with the highest atmospheric pressure is July (1014.4mbar).
The months with the lowest atmospheric pressure are February and March (1010.3mbar).
Average wind speed in September
Ndende, Gabon
- Average wind speed in September: 6.1km/h
The windiest month (with the highest average wind speed) is August (6.5km/h).
The calmest months (with the lowest average wind speed) are January and December (4km/h).
Average humidity in September
Ndende, Gabon
- Average humidity in September: 77%
The month with the highest relative humidity is November (91%).
The month with the lowest relative humidity is August (72%).
Average rainfall in September
Ndende, Gabon
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is November (267mm).
The driest month (with the least rainfall) is July (4mm).
Average rainfall days in September
Ndende, Gabon
- Average rainfall days in September: 18.1 days
The month with the highest number of rainy days is December (30.2 days).
The month with the least rainy days is July (6.3 days).
Average daylight in September /
Average sunshine in September
Ndende, Gabon
- Average daylight in September: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 18min).
The month with the shortest days is June (Average daylight: 12h and 0min).
- Average sunshine in September: 4h and 54min
The month with the most sunshine is July (Average sunshine: 7h and 18min).
The month with the least sunshine is October (Average sunshine: 4h and 42min).
Average sunshine days in September
Ndende, Gabon
- Average sunshine days in September: 6.9 days
The month with the most sunshine days is July (20.7 days).
The months with the least sunshine days are November and December (0.5 days).
Average UV index in September
Ndende, Gabon
- Average UV index in September: 6
The months with the highest UV index are January, February, March, April, May, June, July, August and September (UV index 6).
The months with the lowest UV index are October, November and December (UV index 5).
Average cloud cover in September
Ndende, Gabon
- Average cloud cover in September: 70
The month with the most cloud cover is October (Cloud cover 79).
The month with the least cloud cover is July (Cloud cover 50).
Average visibility in September
Ndende, Gabon
- Average visibility in September: 9km
The month with the highest visibility is August (10km).
The month with the lowest visibility is November (5km).





