George Town
Cayman Islands
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
George Town, Cayman Islands

The scenic waterfront in George Town, Cayman Islands, viewed from the water on a warm sunny day
The scenic waterfront in George Town, Cayman Islands, viewed from the water on a warm sunny day
September, the first month of the autumn, in George Town, is also a hot month, with average temperature fluctuating between 30°C (86°F) and 26°C (78.8°F).

Temperature

June through September, with an average high-temperature of 30°C (86°F), are the warmest months.

Rainfall

In George Town, Cayman Islands, during September, the rain falls for 9 days and regularly aggregates up to 180mm (7.1") of precipitation. Throughout the year, there are 80 rainfall days, and 1282mm (50.5") of precipitation is accumulated.

Sea temperature

Months with the warmest seawater are August and September, with an average sea temperature of 29.9°C (85.8°F).
Note: 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.

Daylight

In George Town, the average length of the day is 12.2h.

Sunshine

In September, the average sunshine is 8h.

UV index

In George Town, the average daily maximum UV index is 11. A UV Index reading of 11, and higher, represents an excessive health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 11 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. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What are the warmest months in George Town?

June through September, with an average high-temperature of 30°C (86°F), are warmest months in George Town.

What is the temperature in September in George Town?

The average high-temperature, in September, in George Town, Cayman Islands, is 30°C (86°F), while the average low-temperature is 26°C (78.8°F).

How much does it rain in George Town in September?

In George Town, during September, the rain falls for 9 days and regularly aggregates up to 180mm (7.1") of precipitation.

What months are the sea warmest in George Town?

August and September, with an average sea temperature of 29.9°C (85.8°F), are months with the warmest seawater in George Town.

What is the sea water temperature in September in George Town?

In George Town, in September, the average water temperature is 29.9°C (85.8°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.

How many hours of daylight does George Town have in September?

In George Town, Cayman Islands, the average length of the day in September is 12.2h.

How long on average sun shines in September in George Town?

The average sunshine in September in George Town, Cayman Islands, is 8h.

What is the UV index reading in September in George Town?

The average daily maximum UV index in September in George Town, Cayman Islands, is 11. A UV Index of 11, and more, symbolizes an extreme health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in September - George Town, Cayman Islands
  • Average high temperature in September: 30°C

Warmest months (with the highest average high temperature) are June, July, August and September (30°C).
Months with the lowest average high temperature are January and February (26°C).

  • Average low temperature in September: 26°C

Months with the highest average low temperature are June, July and August (27°C).
The coldest month (with the lowest average low temperature) is February (22°C).

Average rainfall in September - George Town, Cayman Islands
  • Average rainfall in September: 180mm

The wettest month (with the highest rainfall) is October (226mm).
Driest months (with the lowest rainfall) are February and April (13mm).

Average rainfall days in September - George Town, Cayman Islands
  • Average rainfall days in September: 9 days

The month with the highest number of rainy days is October (10 days).
Months with the lowest number of rainy days are February, March and April (4 days).

Average sea temperature in September - George Town, Cayman Islands
  • Average sea temperature in September: 29.9°C

Best months for swimming (with the highest average sea temperature) are August and September (29.9°C).
The coldest month (with the lowest average sea temperature) is February (26.5°C).

Average daylight in September / Average sunshine in September - George Town, Cayman Islands
  • Average daylight in September: 12.2h

The month with the longest days is June (Average daylight: 13.3h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in September: 8h

The month with most sunshine is April (Average sunshine: 10h).
Months with least sunshine are November and December (Average sunshine: 7).

Average UV index in September - George Town, Cayman Islands
  • Average UV index in September: 11

Months with the highest UV index are March, April, May, June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 7).