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Grand Cayman Weather in September, Cayman Islands

Grand Cayman Averages September


  • What is Average Temperature?
    The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month


  • What is Average High Low Temperature?
    The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

    High Temperature

  • What is Average High Low Temperature?
    The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

    Low Temperature

  • What is Average Sea Temperature?
    Average daily sea temperatures and divided by the number of days in the month. Sea Temperatures are taken from buoys, ships and even satellites can calculate sea temperature based on energy that is radiated from the sea's surface

    Sea Temperature

  • What are Average Daily Sunshine Hours?
    Total sunshine hours for the month, divided by the number of days in the month. Sunshine hours are taken with a sunshine recorder, either a Campbell-Stokes recorder or an Eppley Pyreheliometer

    Sunshine Hours

    9 hours
  • What is Average Rainfall?
    The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

    Rainfall Days

    13 days
  • What is Average Rainfall?
    The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years


    130 mm

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Grand Cayman Daily Averages September

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September Weather Averages

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What's the Weather like in Grand Cayman in September


In September, the highest air temperatures in Grand Cayman are somewhat lower than in August, but are still high. The largest island of the Cayman Islands features temperatures between 26C (78.8F) and 31C (87.8F) throughout the month. Daily high temperatures rarely drop below 30C (86F) or rise over 32C (89.6F). As for daily lows, they tend to vary between 25C (77F) and 28C (82.4F), seldom to a larger extent. Albeit daily high temperatures in Cuba (Havana) are similar to this island, minimum daily temperatures are lower.

The period of the day when it is hot gets shorter at a slow rate in the course of the month. At the beginning of the month, the heat usually takes place between 9 am and 7 pm. By the end of the month, prepare to contend with the heat from around 10 am until 6 pm.


The likelihood of a cloudy day in September in Grand Cayman Island is little below 80% throughout the month. According to statistics, the first and the last day of the month are both 77% likely to be cloudy. That makes them the clearest days in September. September 21 is the cloudiest day, with a 21% chance to be clear, mostly clear or partially cloudy.

Sunshine Hours

However, an average day on the island is the cloudiest during the night. Mid-morning is usually the clearest time of the day. In that regard, it isn't strange that the overall number of sunshine hours per day is 8 or 9.


With the passage of time, it becomes increasingly likely that the day will be rainy in the Grand Cayman resort in September. On September 1, the likelihood that the rain will take place is 28%. From then on, this possibility increases at a rapid rate, ending with a 39% chance for a rainy day on September 30. The highest probability of a wet day in this month is on September 28, which is, with a 40% chance for rain, the wettest day in the year.

The amount of received precipitation increases with the possibility of a rainy day. If rain occurs on September 1, it is most likely that the amount of rainfall would be around 50 mm (1.97 in), possibly up to 103 mm (4 in). On September 30, the average amount of precipitation is 99 mm (3.9 in), albeit it tends to rise up to 214 mm (8.42 in). 

The overall amount of rainfall in September tends to rise up to 220 mm (8.66 in). Regarding that, September is one of two months in the resort of Grand Cayman that are rainy the most. The average number of wet days is 13.

Albeit these statistics don't appear promising, note that precipitation is most likely to occur during the night. Rain, in general, is the least likely to happen during evening hours. More so, when showers and thunderstorms end, they usually don't take place again during that day. Also, it isn't unheard of having a rain in one part of the town, much less district, while the other remains dry.

Wind Speed

The average speed of the wind is constant on the island in September, remaining around 4.9 m/s. Without considering subtle variations, the windiest time of the day is around 8:30 am, while the calmest time of the day is around 4 pm.


The possibility of a very humid and hot day on the island of Grand Cayman is constantly around 100% throughout the month. Deviations in this regard are negligible.

Sunrise and Sunset

With every passing day in September, the duration of daylight becomes shorter. On September 1, for example, the sun rises at 6:09 am and sets at 6:39 pm. On the last day of the month, sunrise takes place at 6:15 am while the sunset occurs at 6:14 pm.

Average Sea Temperature

The temperature of the sea remains at the annual peak in September. Water temperature variations along the Grand Cayman coastline are small, ranging between 29C (84.2F) and 30C (86F).

Extraordinary Weather Occurances

September is in the middle of the hurricane season. However, the chance of this happening during your stay on the island is low. On average, a hurricane or a tropical storm, which is a weaker storm, hits the Cayman Islands every 20 months. More so, the last hurricane that inflicted big damage to Grand Cayman happened in 2004.

Because of the nearness of the zone where North American and Caribbean tectonic plates meet, the islands are susceptible to earthquakes and, consequently, tsunamis. However, these natural disasters are also rare, and the last major earthquake took place in 2004. If a tsunami occurs, the west coast of the island is exposed the most.

If you're looking for a weather forecast for Grand Cayman, you are advised to visit this page.

Hotels for Grand Cayman in September

Due to low season in the Grand Cayman resort in September, accommodation rates tend to be at their lowest this time of year.

Eldemire's Tropical Island Inn

Eldemire's Tropical Island Inn is a 3-star property in George Town, offering rooms and studios. Each unit has a private bathroom and air-conditioning, with views of a swimming pool or gardens. Free parking and Wi-Fi are also provided. Eldemire's Tropical Island Inn is a few minutes away from the nearest beach. The airport is a few kilometers/miles distant.

Harbor View Apartments

The location of Harbor View Apartments is on the south side of Seven Miles Beach. The property is conveniently located in regard to fine shopping and snorkeling opportunities, and features views of the harbor and the sea. Some accompanying amenities are free Wi-Fi, equipped kitchens or kitchenettes, cable TVs and free parking. The international airport is about 10 minutes away by car.

Holiday Inn Resort Grand Cayman

Holiday Inn Resort Grand Cayman is a luxurious complex overlooking the North Sound. The resort is conveniently located regarding the North Sound Golf Club, and the airport, which is several kilometers (a few miles) away. The property has a bar and a restaurant. Complimentary facilities are a pool, a fitness center and a tennis court. Every room has free Wi-Fi and a flat-screen TV.

Beaches for September for Grand Cayman

When someone mentions the island of Grand Cayman, many people first think of spectacular beaches. These are available everywhere on the island. While some of them feature sports courts and beach bars nearby, others boast only natural beauty. So, no matter where your accommodation is, explore the island for the best experience.

Governor's Beach

Besides in swimming, many people that visit Governor's Beach are interested in snorkeling. Waters of this attractive beach are very transparent, which makes this underwater activity quite engaging. Trees line the beach, providing shade. Governor's Beach is a part of 7 Miles Beach, and offers great sunset-watching opportunities.

Gun Bay Beach

Gun Bay Beach is a tranquil beach, which you can find on the east coastline of East End. Because of its distance from George Town, it is unlikely to get crowded. Waters of this beach are turquoise and shallow, while white sand is soft. Restrooms aren't available on Gun Bay Beach.

North Sound

North Sound is a protected lagoon, bordered by West Bay, George Town and North Side districts. The lagoon boasts extraordinary underwater world, which offers an amazing diving experience. Castle Wall, whose topography reminds of a medieval castle, 3B Wall, Hammerhead Hill and Eagle Ray Pass are some spots you should explore here. If you encounter a nurse shark, don't feel troubled. They are not dangerous to humans unless provoked or bothered.

Restaurants and Bars for Grand Cayman in September

Grand Cayman Island features many outstanding restaurants and bars, most of which you can find in and around George Town.


Cimboco is a Caribbean-style café that serves pastas, pizzas, soups, homemade breads and more. Once you dine, you should try their ice cream. Cimboco is a mid-range eatery that is open from 7:30 am (7 am on weekends) to 10 pm.


Lauren's is a restaurant with moderately-priced dishes. The restaurant is open for lunch and dinner. If you visit Lauren's in the afternoon, you can opt for a steak, fish tacos or chicken breast. For dinner, you can order Caesar Salad, Goat Cheese Salad and Crab Cake among other dishes on offer. Or, you can simply try their savoury or sweet crepes. The eatery is open daily except on Sunday. Opening hours are from 8 am to 3 pm (Mon-Sat) and from 6 pm to 9 pm (Fri-Sat).  

Cayman Creperie

Cayman Creperie is a restaurant near the George Town pier. It is a little eatery that serves savoury and sweet crepes, including gluten free ones. They also have smoothies and coffees on offer. Cayman Creperie's opening hours are daily from 8 am to 10 pm.

Cayman Cabana

Cayman Cabana is a waterfront restaurant a short distance from the George Town port. It has a multi-tiered deck that offers views of the Caribbean Sea, so reserve a place in the front row for a sunset dinner. They serve fish and meat dishes, and stage Farm to Table Dinner on Thursdays, which introduces fine, locally-grown food. Cayman Cabana is open daily, except on Sunday, from 10 am to 10 pm (midnight on Friday and Saturday).

Things to Do in Grand Cayman in September

There are many entertaining activities you can enjoy all year round in the resort of Grand Cayman. While most people flock to the Grand Cayman coastline, you shouldn't exclude some attractive points of interest located inland.

Dolphin Discovery Grand Cayman

Dolphin Discovery Grand Cayman is a complex in West Bay that allows its visitors to make friends with likable dolphins. There, you can swim with dolphins, "shake hands" and hug with them, and maybe receive a dolphin kiss. Young children attend programs for free. 

Miss Lassie's House

Miss Lassie's House, also known as the Mind's Eye, is an ordinary house from the outside. But inside, it reveals paintings that convey Biblical scenes and various abstract patterns. For a deeper insight into the works of art, you can join a guided tour.

The National Gallery of the Cayman Islands

The National Gallery of the Cayman Islands exhibits Caymanian, British and American works of art. As you approach this exhibition venue, you can appreciate a series of surrounding gardens. The National Gallery has a permanent collection, but also stages temporary exhibitions. More so, the NGCI organizes guided tours, lectures and workshops suitable for all ages.