September weather forecastCharlestown, Guyana

September

Weather in September

September, the first month of the autumn in Charlestown, is still a tropical month, with temperature in the range of an average high of 33.1°C (91.6°F) and an average low of 22.9°C (73.2°F).

Temperature

The warmest temperatures occur during September, when averages reach a peak of 33.1°C (91.6°F) and a low of 22.9°C (73.2°F).

Heat index

Throughout September, the heat index is evaluated at a life-threatening hot 48°C (118.4°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
Consider that heat index readings are for situations in the shade and light wind. Direct sunlight can potentially boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', determines the feeling of heat when you account for the relative humidity. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The months with the lowest humidity are September and October, with an average relative humidity of 78%.

Rainfall

The month with the least rainfall is September, when the rain falls for 21 days and typically collects 55mm (2.17") of precipitation.

Daylight

In Charlestown, the average length of the day in September is 12h and 10min.
On the first day of September in Charlestown, sunrise is at 05:45 and sunset at 17:59. On the last day of the month, sunrise is at 05:40 and sunset at 17:44 -04.

Sunshine

The average sunshine in September is 9h.

UV index

The months with the highest UV index in Charlestown are March, April, July through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.

Updated: Feb 19, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Charlestown's temperature records reveal September as the warmest month, marked by average highs of 33.1°C (91.6°F) and lows of 22.9°C (73.2°F).

The high-temperature, in September, in Charlestown, is 33.1°C (91.6°F), while the low-temperature averages to 22.9°C (73.2°F). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 48°C (118.4°F).

The months with the lowest humidity are September and October, with an average relative humidity of 78%.

In Charlestown, the average relative humidity in September is 78%.

The month with the least rainfall is September, when the rain falls for 21 days and typically collects 55mm (2.17") of precipitation.

In Charlestown, in September, it is raining for 21 days, with typically 55mm (2.17") of accumulated precipitation.

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

In September, on the first day of the month, sunrise is at 05:45 and sunset at 17:59. On the last day of the month, sunrise is at 05:40 and sunset at 17:44 -04.

In Charlestown, Guyana, the average sunshine duration in September is 9h.

The months with the highest UV index in Charlestown, Guyana, are March, April, July through November, with an average maximum UV index of 7.

In Charlestown, Guyana, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

32.2°C

33.1°C

32.9°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5.8km/h

6.2km/h

6.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

8.5

6.2

5.2

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Charlestown, Guyana

Average high temperature in September: 33.1°C

The warmest month (with the highest average high temperature) is September (33.1°C).
The month with the lowest average high temperature is January (29.3°C).

Average low temperature in September: 22.9°C

The month with the highest average low temperature is October (23.5°C).
The coldest month (with the lowest average low temperature) is January (21.8°C).

Average pressure in September
Charlestown, Guyana

Average pressure in September: 1011.6mbar

The month with the highest atmospheric pressure is June (1013.3mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).

Average wind speed in September
Charlestown, Guyana

Average wind speed in September: 5.8km/h

The windiest month (with the highest average wind speed) is March (7.3km/h).
The calmest months (with the lowest average wind speed) are July and August (5.1km/h).

Average humidity in September
Charlestown, Guyana

Average humidity in September: 78%

The month with the highest relative humidity is June (85%).
The months with the lowest relative humidity are September and October (78%).

Average rainfall in September
Charlestown, Guyana

Average rainfall in September: 55mm

The wettest month (with the highest rainfall) is June (167mm).
The driest month (with the least rainfall) is September (55mm).

Average rainfall days in September
Charlestown, Guyana

Average rainfall days in September: 21 days

The month with the highest number of rainy days is December (29.1 days).
The month with the least rainy days is August (20.8 days).

Average daylight in September /
Average sunshine in September
Charlestown, Guyana

Average daylight in September: 12h and 12min

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: 9h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 6h and 0min).

Average sunshine days in September
Charlestown, Guyana

Average sunshine days in September: 6.2 days

The month with the most sunshine days is August (8.5 days).
The month with the least sunshine days is December (0.3 days).

Average UV index in September
Charlestown, Guyana

Average UV index in September: 7

The months with the highest UV index are March, April, July, August, September, October and November (UV index 7).
The months with the lowest UV index are January, February, May, June and December (UV index 6).