Cayenne
French Guiana
Long-term weather forecast
Long-term weather forecast

July weather forecast and climate
Cayenne, French Guiana

Palm trees in a botanical garden in Cayenne, French Guiana, overlooking green fields under clear skies
Palm trees in a botanical garden in Cayenne, French Guiana, overlooking green fields under clear skies
July, the same as June, in Cayenne, French Guiana, is a hot summer month, with temperature in the range of an average high of 30.8°C (87.4°F) and an average low of 22.4°C (72.3°F).

Temperature

In July, the average high-temperature is almost the same as in June - a still tropical 30.8°C (87.4°F). The average low-temperature, in Cayenne, is 22.4°C (72.3°F).

Rainfall

In Cayenne, during July, the rain falls for 20.6 days and regularly aggregates up to 245.7mm (9.7") of precipitation. Throughout the year, there are 221.1 rainfall days, and 3516.3mm (138.4") of precipitation is accumulated.

Sea temperature

In Cayenne, French Guiana, in July, the average water temperature is 28.6°C (83.5°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

Months with the longest days are June and July, with an average of 12.4h of daylight.

Sunshine

The average sunshine in July is 6.3h.

UV index

July and December, with an average maximum UV index of 11, are months with the lowest UV index in Cayenne. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 11 in July interpret into the following advice:
Practice all-important precautions. Light skin people may get burned in less than 5 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in July in Cayenne?

The average high-temperature, in July, in Cayenne, is 30.8°C (87.4°F), while the average low-temperature is 22.4°C (72.3°F).

How many days does it rain in July in Cayenne?

In Cayenne, in July, it is raining for 20.6 days, with typically 245.7mm (9.7") of accumulated precipitation.

What is the water temperature in July in Cayenne?

In Cayenne, the average seawater temperature in July is 28.6°C (83.5°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

When are the longest days in Cayenne?

June and July, with an average of 12.4h of daylight, are months with the longest days in Cayenne.

How many hours of daylight does Cayenne have in July?

In July, the average length of the day in Cayenne, French Guiana, is 12.4h.

How long on average sun shines in July in Cayenne?

In Cayenne, the average sunshine in July is 6.3h.

What are the months with the lowest UV index in Cayenne?

Months with the lowest UV index are July and December, with an average maximum UV index of 11.

What is the UV index reading in July in Cayenne?

The average daily maximum UV index in July in Cayenne, French Guiana, is 11. A UV Index estimate of 11, and higher, represents an extreme health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in July - Cayenne, French Guiana
  • Average high temperature in July: 30.8°C

The warmest month (with the highest average high temperature) is October (32.2°C).
The month with the lowest average high temperature is January (29.1°C).

  • Average low temperature in July: 22.4°C

The month with the highest average low temperature is April (23.7°C).
The coldest month (with the lowest average low temperature) is September (22.2°C).

Average rainfall in July - Cayenne, French Guiana
  • Average rainfall in July: 245.7mm

The wettest month (with the highest rainfall) is May (579.4mm).
The driest month (with the lowest rainfall) is September (55.7mm).

Average rainfall days in July - Cayenne, French Guiana
  • Average rainfall days in July: 20.6 days

The month with the highest number of rainy days is May (26.4 days).
The month with the lowest number of rainy days is September (7.1 days).

Average sea temperature in July - Cayenne, French Guiana
  • Average sea temperature in July: 28.6°C

The best month for swimming (with the highest average sea temperature) is August (28.7°C).
The coldest month (with the lowest average sea temperature) is February (27.3°C).

Average daylight in July / Average sunshine in July - Cayenne, French Guiana
  • Average daylight in July: 12.4h

Months with the longest days are June and July (Average daylight: 12.4h).
The month with shortest days is December (Average daylight: 11.8h).

  • Average sunshine in July: 6.3h

The month with most sunshine is September (Average sunshine: 8.5h).
The month with least sunshine is January (Average sunshine: 3h).

Average UV index in July - Cayenne, French Guiana
  • Average UV index in July: 11

Months with the highest UV index are January, February, March, April, May, June, August, September, October and November (UV index 12).
Months with the lowest UV index are July and December (UV index 11).