Monrovia
Liberia
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Monrovia, Liberia

September, the first month of the autumn, in Monrovia, is also a moderately hot month, with average temperature varying between 29°C (84.2°F) and 21°C (69.8°F).

Temperature

In Monrovia, the average high-temperature remains the same as in August - a still warm 29°C (84.2°F). In Monrovia, Liberia, in September, the average low-temperature is 21°C (69.8°F).

Heat index

In September, the average heat index is estimated at a sweltering 36.8°C (98.2°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like differences in body mass, height, and shape, clothing, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The most humid month in Monrovia is September, with an average relative humidity of 89%.

Rainfall

In Monrovia, Liberia, it is raining for 26 days, with typically 744mm (29.3") of accumulated precipitation. Throughout the year, in Monrovia, Liberia, there are 207 rainfall days, and 5140mm (202.4") of precipitation is accumulated.

Sea temperature

Months with the coldest seawater in Monrovia are August and September, with an average sea temperature of 27°C (80.6°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day in Monrovia is 12.2h.

Sunshine

The average sunshine in Monrovia is 4h.

UV index

February through June, August through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an extreme threat to health from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 12 in September interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in September in Monrovia?

In Monrovia, Liberia, in September, the average high-temperature is 29°C (84.2°F), and the average low-temperature is 21°C (69.8°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that combines air temperature and relative humidity, in September is evaluated at 36.8°C (98.2°F).

What is the most humid month in Monrovia?

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

What is the average humidity in September in Monrovia?

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

How much does it rain in Monrovia in September?

In Monrovia, in September, it is raining for 26 days, with typically 744mm (29.3") of accumulated precipitation.

What are the months with the coldest sea water in Monrovia?

August and September, with an average sea temperature of 27°C (80.6°F), are months with the coldest seawater in Monrovia.

What is the water temperature in September in Monrovia?

In Monrovia, Liberia, the average seawater temperature in September is 27°C (80.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in September in Monrovia?

The average length of the day in September is 12.2h.

How many hours of sunshine does Monrovia have in September?

In Monrovia, the average sunshine in September is 4h.

What are the months with the highest UV index in Monrovia?

February through June, August through October, with an average maximum UV index of 12, are months with the highest UV index in Monrovia.

How high is the UV index in September in Monrovia?

In Monrovia, Liberia, the average daily maximum UV index in September is 12. A UV Index reading of 11, and higher, represents an extreme health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - Monrovia, Liberia
  • Average high temperature in September: 29°C

The warmest month (with the highest average high temperature) is March (31.9°C).
The month with the lowest average high temperature is July (28.9°C).

  • Average low temperature in September: 21°C

The month with the highest average low temperature is April (22.1°C).
The coldest month (with the lowest average low temperature) is August (20°C).

Average humidity in September - Monrovia, Liberia
  • Average humidity in September: 89%

The month with the highest relative humidity is September (89%).
The month with the lowest relative humidity is May (84%).

Average rainfall in September - Monrovia, Liberia
  • Average rainfall in September: 744mm

The wettest month (with the highest rainfall) is July (996mm).
The driest month (with the lowest rainfall) is January (31mm).

Average rainfall days in September - Monrovia, Liberia
  • Average rainfall days in September: 26 days

Months with the highest number of rainy days are June and September (26 days).
Months with the lowest number of rainy days are January and February (5 days).

Average sea temperature in September - Monrovia, Liberia
  • Average sea temperature in September: 27°C

The best month for swimming (with the highest average sea temperature) is May (28.9°C).
Coldest months (with the lowest average sea temperature) are August and September (27°C).

Average daylight in September / Average sunshine in September - Monrovia, Liberia
  • Average daylight in September: 12.2h

Months with the longest days are June and July (Average daylight: 12.5h).
Months with shortest days are January, November and December (Average daylight: 11.8h).

  • Average sunshine in September: 4h

The month with most sunshine is March (Average sunshine: 7h).
Months with least sunshine are July and August (Average sunshine: 3).

Average UV index in September - Monrovia, Liberia
  • Average UV index in September: 12

Months with the highest UV index are February, March, April, May, June, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).