Climate and monthly weather forecastBarthélemy, French Guiana
Climate and monthly weather forecast
The climate of Barthélemy
Combining subtropical heat with high humidity, the climate of Barthélemy, French Guiana firmly falls under the Köppen classification Af, also known as a tropical rainforest climate. Positioned in the northern hemisphere, near the equator, Barthélemy experiences little variation in temperature throughout the year, however there are notable changes in rainfall levels and daylight hours during the year.Taking a close look at the annual weather trends, temperatures vary marginally, reaching their peak between August and October with highs of 31.5°C (88.7°F) to 31.6°C (88.9°F) and lows of around 24.5°C (76.1°F) to 24.8°C (76.6°F). The coldest period is from January to February, but with temperatures still averaging between 24°C (75.2°F) and 28°C (82.4°F) even in these months. Barthélemy is truly a place of eternal summer. Observing rainfall patterns, the wettest period is from April to June where rainfall varies from 208mm (8.19") to 293mm (11.54"). By comparison, relegating itself to the role of 'drier season' September through November sees reduced rainfall, ranging from 23mm (0.91") to 73mm (2.87").
Assessing the daylight hours and sunshine duration further enhances understanding of Barthélemy's climate. Daylight hours are quite consistent throughout the year, staying between 11.9 hours and 12.4 hours. The sunniest months are from August to October, with 8.8 hours to 9.2 hours of sunshine. Interestingly, these months also coincide with the highest temperatures recorded in the region.
The best time to visit Barthélemy
When planning a visit to Barthélemy, the months from August to November prove to be the most desirable. During these months, rainfall significantly subsides to its lowest levels of 23mm (0.91") to 73mm (2.87") and the sunshine hours peak from 8.8 hours to 9.2 hours. This period also sees temperatures at their warmest - around 30.8°C (87.4°F) to 31.6°C (88.9°F) - ideal for outdoor activities and exploration. Though temperatures are consistently high throughout the year, experiencing Barthélemy with reduced rainfall and extended sunshine durations offers a more comforatable exploration of the tropical rainforest climate.The worst time to visit Barthélemy
The least ideal time to visit Bartélemy falls between the months of April and June. During this time, Barthélemy experiences its highest levels of rainfall, reaching an apex of 293mm (11.54") in May. Even though temperatures remain alluring and warm, consistently high rainfall may present inconveniences to outdoor activities and tourism in general.Spring weather in Barthélemy
In the months of March, April, and May, Barthélemy encounters high humidity levels upwards of 84%, and rain peaks in May with 293mm (11.54"). Daylight hours slowly increase starting from 12.1 hours in March to 12.3 hours May. While temperatures remain high, ranging from 28.3°C (82.9°F) to 28.6°C (83.5°F), it is the profuse rainfall that defines Barthélemy's spring season.Summer weather in Barthélemy
Summer in Barthélemy, June through August, sees a reduction in rainfall and an increase in sunshine hours. Rainfall retreats from 234mm (9.21") in June to 68mm (2.68") by August and this period marks the longest sunshine duration, peaking at 8.8 hours in August. The temperature also sees a slight rise, with highs of 29.8°C (85.6°F) in June to 30.9°C (87.6°F) in August, making it a hot and relatively drier summer.Autumn weather in Barthélemy
September signals the onset of autumn in Barthélemy and it features the least rainfall across the whole year, falling to a mere 23mm (0.91"). The months continue to remain quite sunny with around 8.7 hours to 9.2 hours of sunshine per day. In terms of temperature, autumn is the warmest season with temperatures soaring from 31.5°C (88.7°F) to 31.6°C (88.9°F) and then easing back to 30.8°C (87.4°F) in November.Winter weather in Barthélemy
Winter months of December, January and February in Barthélemy are characterized by slightly lower temperatures with highs ranging from 28°C (82.4°F) to 28.8°C (83.8°F) and lows from 24°C (75.2°F) to 24.5°C (76.1°F). Rainfall records an increase during these months, peaking at 204mm (8.03") in December and then slowly receding to 154mm (6.06") by February. However, despite these variations, Barthélemy’s winters are far from cold, maintaining a tropical allure with the abundance of warmth and moisture.Weather in January
Barthélemy in January is often moist due to frequent rains with rainfall reaching 154mm (6.06"). The city experiences a gradual change in weather from the previous year as temperatures range from 24°C (75.2°F) as the minimum to a maximum of 28°C (82.4°F). Weather in January »Weather in February
As Barthélemy transitions from January to February, an increase in humidity from 84% to 85% characterizes the prevailing weather conditions. Coinciding with this, February sees a surge in rainfall, reaching a peak at 163mm (6.42") over an average of 26.3 days. Weather in February »Weather in March
Barthélemy in March ushers in a subtle decline in rainfall, down to 128mm (5.04"), a contrast from February’s 163mm (6.42"). Yet, March continues the trend of a tropical climate with a combination of high humidity and significant rainfall. Weather in March »Weather in April
An interesting shift takes place in Barthélemy's weather in April, with rainfall shooting up to 208mm (8.19"), a sharp increase from the previous month's 128mm (5.04"). Simultaneously, the lower temperature limit rises to 24.7°C (76.5°F), the highest so far in the year. Weather in April »Weather in May
High rainfall marks the weather in Barthélemy in May, soaring to an annual high of 293mm (11.54"), up from April's already high 208mm (8.19"). This month still ensures a pronounced tropical climate, defined by increased precipitation, warmth, and humidity. Weather in May »Weather in June
A pleasant reprieve characterizes the weather in June in Barthélemy with a significant drop in rainfall from the previous month's peak, decreasing to 234mm (9.21"). While the city remains warm and humid, the rainfall's easing signals the onset of a slightly dryer period. Weather in June »Weather in July
July in Barthélemy witnesses a further decrease in rainfall, stepping down to 133mm (5.24"), continuing the downward trend from June. Despite this decline in precipitation, the tropical climate persists unhindered because of the warm temperature range and high humidity. Weather in July »Weather in August
August in Barthélemy features even lower rainfall levels, dropping to 68mm (2.68"), a significant decrease from July. Simultaneously, the city catches a break from the intense humidity with the relative humidity descending to 78%. Weather in August »Weather in September
September in Barthélemy witnesses the least amount of rainfall in the year, down to a mere 23mm (0.91"). The drastic reduction in precipitation signifies the peak of the dry spell that began in June. Despite this, Barthélemy continues to be characterized by a warm tropical climate as temperatures, humidity, and daylight hours remain high. Weather in September »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. Weather in October »Weather in November
Westher in Barthélemy in November sees rainfall increasing further to 73mm (2.87"), continuing October's upward trend. The tropical climate intensifies with the return of significant rainfall, accompanied by the usual warmth and humidity. Weather in November »Weather in December
December marks the end of the transitional phase with rainfall rising to 204mm (8.03"), placing it amongst the months with the heaviest downpours. Barthélemy in December stays true to its tropical climate with relatively high temperatures and high humidity. Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Barthélemy, during the entire year, the rain falls for 277 days and collects up to 1707mm (67.2") of precipitation.
The months with the lowest UV index are January through May and December, with an average maximum UV index of 6.
The month of February, characterized by an average high of 27.7°C (81.9°F) and a low of 23.9°C (75°F), is recognized as the coldest.
February has the least sunshine of the year in Barthélemy, with an average of 5.6h of sunshine.
May is the most humid month in Barthélemy, with an average relative humidity of 86%.
May is the month with the most rainfall in Barthélemy, French Guiana. Rain falls for 28.9 days and accumulates 293mm (11.54") of precipitation.
The month with the longest days in Barthélemy, French Guiana, is June, with an average of 12h and 24min of daylight.
The months with the highest UV index are June through November, with an average maximum UV index of 7.
September and October, with an average relative humidity of 76%, are the least humid months.
The month with the least rainfall in Barthélemy is September, when the rain falls for 12.2 days and typically collects 23mm (0.91") of precipitation.
The month with the most sunshine in Barthélemy, French Guiana, is September, with an average of 9.2h of sunshine.
Temperature readings reach their annual highs in October, averaging 31.6°C (88.9°F) and a minimum average of 24.8°C (76.6°F).
The month with the shortest days is December, with an average of 11h and 54min of daylight.
Barthélemy does not utilize Daylight Saving Time (DST). -03 timezone is used throughout the entire year.
Average temperature
Barthélemy, French Guiana
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).
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
Barthélemy, French Guiana
- Average pressure in January:
1011.9mbar - Average pressure in February:
1011.7mbar - Average pressure in March:
1011.9mbar - Average pressure in April:
1011.9mbar - Average pressure in May:
1012.3mbar - Average pressure in June:
1013.1mbar
- Average pressure in July:
1013.2mbar - Average pressure in August:
1012.7mbar - Average pressure in September:
1012mbar - Average pressure in October:
1010.6mbar - Average pressure in November:
1009.8mbar - Average pressure in December:
1010.8mbar
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
Barthélemy, French Guiana
- Average wind speed in January:
12.2km/h - Average wind speed in February:
12.9km/h - Average wind speed in March:
12.7km/h - Average wind speed in April:
11.7km/h - Average wind speed in May:
10.5km/h - Average wind speed in June:
8.5km/h
- Average wind speed in July:
8.3km/h - Average wind speed in August:
10km/h - Average wind speed in September:
11.1km/h - Average wind speed in October:
11.1km/h - Average wind speed in November:
11.1km/h - Average wind speed in December:
11.7km/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
Barthélemy, French Guiana
The month with the highest relative humidity is May (86%).
The months with the lowest relative humidity are September and October (76%).
Average rainfall
Barthélemy, French Guiana
- Average rainfall in January:
154mm - Average rainfall in February:
163mm - Average rainfall in March:
128mm - Average rainfall in April:
208mm - Average rainfall in May:
293mm - Average rainfall in June:
234mm
The wettest month (with the highest rainfall) is May (293mm).
The driest month (with the least rainfall) is September (23mm).
Average rainfall days
Barthélemy, French Guiana
- Average rainfall days in January:
28 days - Average rainfall days in February:
26.3 days - Average rainfall days in March:
27.2 days - Average rainfall days in April:
27.2 days - Average rainfall days in May:
28.9 days - Average rainfall days in June:
28.2 days
- Average rainfall days in July:
26.6 days - Average rainfall days in August:
19.2 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
11.6 days - Average rainfall days in November:
16.4 days - Average rainfall days in December:
25.2 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 / Average sunshine
Barthélemy, French Guiana
- Average daylight in January:
11h and 54min - Average daylight in February:
12h and 0min - Average daylight in March:
12h and 6min - Average daylight in April:
12h and 12min - Average daylight in May:
12h and 18min - Average daylight in June:
12h and 24min
- Average daylight in July:
12h and 18min - Average daylight in August:
12h and 18min - Average daylight in September:
12h and 6min - Average daylight in October:
12h and 0min - Average daylight in November:
11h and 54min - Average daylight in December:
11h and 54min
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 January:
6h and 48min - Average sunshine in February:
5h and 36min - Average sunshine in March:
6h and 0min - Average sunshine in April:
6h and 12min - Average sunshine in May:
6h and 54min - Average sunshine in June:
7h and 30min
- Average sunshine in July:
8h and 18min - Average sunshine in August:
8h and 48min - Average sunshine in September:
9h and 12min - Average sunshine in October:
9h and 6min - Average sunshine in November:
8h and 42min - Average sunshine in December:
7h and 18min
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
Barthélemy, French Guiana
- Average sunshine days in January:
1.8 days - Average sunshine days in February:
1.3 days - Average sunshine days in March:
2.3 days - Average sunshine days in April:
1.5 days - Average sunshine days in May:
1.1 days - Average sunshine days in June:
0.9 days
- Average sunshine days in July:
2.3 days - Average sunshine days in August:
6.8 days - Average sunshine days in September:
13.6 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
11.2 days - Average sunshine days in December:
4.1 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
Barthélemy, French Guiana
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
Barthélemy, French Guiana
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
Barthélemy, French Guiana
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).
