October weather forecast
Barthélemy, French Guiana

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Weather in October

October presents a reversal in the weather in Barthélemy with a slight increase in rainfall to 26mm (1.02"), breaking the dry spell observed from June to September. As the rainfall picks up, temperatures also take an upward turn, creating the perfect tropical setting as we approach the year's end. Daylight hours and humidity hold steady, maintaining the city's warm and humid environment. The wind's speed stands unchanged from the previous month enforcing the consistency of Barthélemy's tropical weather. Hence, October subtly shifts the weather pattern from dry to slightly wetter while retaining the tropical ambience.

Temperature

October, on average, is the warmest month in Barthélemy, registering a high temperature of 31.6°C (88.9°F) and a low of 24.8°C (76.6°F).

Heat index

The heat index value during October is evaluated at an extremely hot 41°C (105.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Know that the heat index computations account for shaded terrains and slight winds. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is achieved by amalgamating air temperature with the relative humidity readings. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

September and October, with an average relative humidity of 76%, are the least humid months.

Rainfall

In October, the rain falls for 11.6 days. Throughout October, 26mm (1.02") of precipitation is accumulated. In Barthélemy, during the entire year, the rain falls for 277 days and collects up to 1707mm (67.2") of precipitation.

Daylight

The average length of the day in October is 12h and 2min.
On the first day of the month, sunrise is at 06:17 and sunset at 18:21. On the last day of October, sunrise is at 06:14 and sunset at 18:12 -03.

Sunshine

In Barthélemy, the average sunshine in October is 9.1h.

UV index

The months with the highest UV index in Barthélemy are June through November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: An average UV index of 7 in October transforms into this advice:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.

Frequently asked questions

What is the hottest time of year in Barthélemy?

Temperature readings in Barthélemy, French Guiana, reach their annual highs in October, averaging 31.6°C (88.9°F) and a minimum average of 24.8°C (76.6°F).

How hot does it get in Barthélemy in October?

In October, the average high-temperature and low-temperature in Barthélemy, French Guiana, are 31.6°C (88.9°F) and 24.8°C (76.6°F) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in October is evaluated at 41°C (105.8°F).

What are the least humid months in Barthélemy?

September and October, with an average relative humidity of 76%, are the least humid months in Barthélemy, French Guiana.

What is the average humidity in October in Barthélemy?

In October, the average relative humidity in Barthélemy, French Guiana, is 76%.

How much does it rain in Barthélemy in October?

In Barthélemy, in October, it is raining for 11.6 days, with typically 26mm (1.02") of accumulated precipitation.

What is the average length of the day in October in Barthélemy?

In Barthélemy, the average day length in October is 12h and 2min.

When is the sunrise / sunset in October in Barthélemy?

In October, on the first day of the month, sunrise is at 06:17 and sunset at 18:21. On the last day of the month, in Barthélemy, French Guiana, sunrise is at 06:14 and sunset at 18:12 -03.

How many hours of sunshine does Barthélemy have in October?

The average sunshine duration in October in Barthélemy is 9.1h.

When is the highest UV index in Barthélemy?

The months with the highest UV index in Barthélemy, French Guiana, are June through November, with an average maximum UV index of 7.

How high is the UV index in October in Barthélemy?

In Barthélemy, the average daily maximum UV index in October is 7. A UV Index reading of 6 to 7 represents a high hazard to health from exposure to Sun's UV rays.

Average temperature in October
Barthélemy, French Guiana

Average temperature in October - Barthélemy, French Guiana
  • Average high temperature in October: 31.6°C

The warmest month (with the highest average high temperature) is October (31.6°C).
The month with the lowest average high temperature is February (27.7°C).

  • Average low temperature in October: 24.8°C

The months with the highest average low temperature are October and November (24.8°C).
The coldest months (with the lowest average low temperature) are June and July (23.8°C).

Average pressure in October
Barthélemy, French Guiana

Average pressure in October - Barthélemy, French Guiana
  • Average pressure in October: 1010.6mbar

The month with the highest atmospheric pressure is July (1013.2mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).

Average wind speed in October
Barthélemy, French Guiana

Average wind speed in October - Barthélemy, French Guiana
  • Average wind speed in October: 11.1km/h

The windiest month (with the highest average wind speed) is February (12.9km/h).
The calmest month (with the lowest average wind speed) is July (8.3km/h).

Average humidity in October
Barthélemy, French Guiana

Average humidity in October - Barthélemy, French Guiana
  • Average humidity in October: 76%

The month with the highest relative humidity is May (86%).
The months with the lowest relative humidity are September and October (76%).

Average rainfall in October
Barthélemy, French Guiana

Average rainfall in October - Barthélemy, French Guiana
  • Average rainfall in October: 26mm

The wettest month (with the highest rainfall) is May (293mm).
The driest month (with the least rainfall) is September (23mm).

Average rainfall days in October
Barthélemy, French Guiana

Average rainfall days in October - Barthélemy, French Guiana
  • Average rainfall days in October: 11.6 days

The month with the highest number of rainy days is May (28.9 days).
The month with the least rainy days is October (11.6 days).

Average daylight in October /
Average sunshine in October
Barthélemy, French Guiana

Average daylight in October / Average sunshine in October - Barthélemy, French Guiana
  • Average daylight in October: 12h and 0min

The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 54min).

  • Average sunshine in October: 9h and 1min

The month with the most sunshine is September (Average sunshine: 9h and 12min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).

Average sunshine days in October
Barthélemy, French Guiana

Average sunshine days in October - Barthélemy, French Guiana
  • Average sunshine days in October: 16.5 days

The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is June (0.9 days).

Average UV index in October
Barthélemy, French Guiana

Average UV index in October - Barthélemy, French Guiana
  • Average UV index in October: 7

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

Average cloud cover in October
Barthélemy, French Guiana

Average cloud cover in October - Barthélemy, French Guiana
  • Average cloud cover in October: 28

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 25).

Average visibility in October
Barthélemy, French Guiana

Average visibility in October - Barthélemy, French Guiana
  • Average visibility in October: 10km

The months with the highest visibility are January, February, March, August, September, October and November (10km).
The months with the lowest visibility are April, May, June, July and December (9km).

Barthélemy, French Guiana

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