September Weather in Bonaire - 2025

Bonaire is a Caribbean island east of Central America and north of Venezuela. The island is part of the ABC Islands together with Aruba and Curaçao. It is a flat, riverless island renowned for its dive spots. Bonaire lies about 50 Miles (80 km) off the coast of Venezuela on the continental shelf of South America, and is thus geologically considered a part of the continent.

Tourism is one of the major industries of the island, and 80% of snowbirds who come to the island come to scuba dive. Bonaire is often considered the top best scuba dive destination in the Caribbean. The colorful coral reef that circles the island is lush and diverse, and its proximity to the island makes for spectacular and convenient shore diving.

The second major source of tourism on the island is cruise ship snowbirds whose boats dock for a single day and then depart at night. With a local population of only 18000, the visiting snowbirds of 3000 or 4000 person cruise liner have a significant influence on the island, particularly in downtown Kralendijk where the ships dock. The two towns on the island are Kralendijk (the capital) and Rincon.

September weather in Bonaire

To get a good overview of the type of weather you can expect in September in Bonaire, we will look at the day and night temperature, minimum and maximum water temperature, and if September is comfortable or humid

Generally, September in Bonaire will be quite hot. Historical data shows that you can expect an average temperature of around 89°F / 32°C. As the humidty is low, it will feel very comfortable. During the night, it will cool down to around 77°F / 25°C. Many will prefer a location with air conditioning due to the night temperature.

Bonaire has its share of rainy days in September. You can expect around 17 rainy days, with on average 1.8 inches / 45 mm of rain during the whole month.

But remember that rain can be short and heavy for many tropical locations, particularly during the rainy season. It means that the number of days with rain and the amount of rain can be high, but you will still see many lovely days with a short period of heavy rain.

September weather in Bonaire in more detail

To get a better feeling for the type of weather, you can expect in September in Bonaire, we will look at the temperature, rain, wind, humidity, water temperature, and sun and clouds

- What will the temperature be in Bonaire in September

Generally, you can expect in September an average temperature of 89°F / 32°C during the day and an average of 77°F / 25°C during the night. In September, during the warmest part of the afternoon, the temperature can often get as high as 96°F / 36°C, and at the end of the night, it can get as low as 73°F / 23°C.

When looking at the whole year, January, February, November and December are the coldest months, with an average temperature of around 84°F / 29°C. August and September are the hottest months, with an average temperature of around 89°F / 32°C. When comparing September with the temperature in the month before and after, this is equal to August, which sees an average maximum temperature of around 89°F / 32°C. And almost equal to October, which sees an average maximum temperature of around 87°F / 31°C.

But average temperatures only tell half of the story. It is also good to check the maximum and minimum temperatures. When looking at the whole year, September is the hottest month, with a temperature of around 96°F / 36°C. January and December are the coldest months, with a temperature of around 87°F / 31°C. When comparing September with the temperature in the month before and after, this is almost equal to August, which sees an average maximum temperature of around 95°F / 35°C. And almost equal to October, which sees an average maximum temperature of around 93°F / 34°C.

In the following graph, you can see how many cold and hot days you can expect in Bonaire each month:

- Can you expect rain in September in Bonaire?

Generally, you can expect about 17 rain days in September, with on average 1.8 inches / 45 mm of rain.

When looking at the whole year, March is the dryest month, with an average rainfall of around 0.3 inches / 7 mmmm. November is the wettest month, with an average rainfall of around 3.8 inches / 97 mmmm. When comparing September with the month before and after, this is more than August, which sees around 1.5 inches / 39 mm of rain. And a lot less than October, which sees around 3.1 inches / 78 mm of rain

If we look at the number of days with rain, March is the month with the least amount of rain days with around 4 days. October is the month with the most rain days with an average of between 20 and 21 days. When comparing September with the month before and after, this is slightly more than August, which sees an average of between 14 and 15 days of rain. And slightly less than October, which sees an average of between 20 and 21 days of rain

There is one thing that is important to know, in many tropical destinations rain can be short and heavy, particularly during the rainy season. It means that the number of days with rain and the amount of rain can be high, but you will still see many lovely days with a short period of heavy rain.

- What will the water temperature be in Bonaire for September

You can expect in September, the water temperature for Bonaire to be between 86°F / 30°C and 82°F / 28°C.

To compare the water temperature we will use the maximum water temperature. You can expect this temperature on a more sunny day, close to the shore, when the wind does not mix the relatively warmer and colder water.

October has the highest water temperature, with an average of between 86°F / 30°C and 87°F / 31°C. February has the lowest water temperature, with an average of between 80°F / 27°C and 82°F / 28°C. When comparing the water temperature from September with the month before and after, September has a water temperature almost equal to August, with a water temperature of an average of between 84°F / 29°C and 86°F / 30°C. And almost equal to the water temperature from October, that is an average of between 86°F / 30°C and 87°F / 31°C.

- Can you expect in September a lot of sunny days in Bonaire

Generally, you can expect around 7 sunny days in September and around 17 partly sunny days. The remaining days will be cloudy.

When looking at the whole year, February is the month with the highest number of sunny days, with an average of between 13 and 14 sunny days. November is the month with the lowest number of sunny days, with around 4 sunny days. When comparing September with the number of sunny days in the month before and after, it is almost equal to August, with an average of between 8 and 9 sunny days. And slightly more than October, with an average of between 4 and 5 sunny days

We have looked at the sunny days in Bonaire. Let's also look at the cloudy or overcast days. October is the month with the highest number of cloudy days, with an average of between 9 and 10 cloudy days. February is the month with the lowest number of cloudy days, with an average of between 0 and 1 cloudy days. When comparing September with the number of cloudy days in the month before and after, it is almost equal to August, with an average of between 4 and 5 cloudy days. And slightly less than October, with an average of between 9 and 10 cloudy days

- Will it be comfortable in September in Bonaire?

Generally, September in Bonaire will have a low humidty, and will feel very comfortable.

We use the humidity and temperature in Bonaire to calculate the Wintersun Expert Comfort level for each month. The lower the Wintersun Expert Comfort level, the more comfortable it will be. Only for certain people, extremely dry air can feel slightly uncomfortable.

When looking at the whole year, January has the lowest humidity, with a Wintersun Expert comfort level of "comfortable" (very dry air). July has the highest humidity, with a Wintersun Expert comfort level of "slightly uncomfortable" (moderately humid). When comparing September with the month before and after, this is less than August, which has a Wintersun Comfort level of "slightly uncomfortable" (moderately humid). And more than October, which has a Wintersun Comfort level of "comfortable" (very dry air)

What to do in Bonaire in September

Bonaire has notable places that are worthwhile visiting:

• The Beaches: The best beaches of Bonaire are Klein Bonaire, Lac Bay, Te Amo Beach, Bachelor's Beach, Donkey Beach, Coco Beach, Pink Beach, and Lac Cai amongst others.
• Nature & Parks: Natural Marine park, Washington-Slagbaai National Park, Iguanas (wild), Flamingoes.
• Bookstore: Addo's books & toysOther attractions: Bonaire's Cadushy Distillery in Rincon, biking Trails of the Valley of Rincon, Goat farm, Disused Slave Shelters, Rock art, and Salt flats.

Is it humid in Bonaire in September?

A lot of people ask interested in the humidity or relative humidity for Bonaire in September. But the real question they want to ask is not about humidity but the amount of moisture in the air. Or better, about comfort. Will it be comfortable in September in Bonaire, or will high humidity make it uncomfortable.

To answer this question, we have to look at the dew point. Relative humidity can change a lot in Bonaire during the day and night, as it changes when the amount of moisture changes and, but also when the temperature changes. It is a lot less reliable for comfort. Where the dew point only varies with the amount of moisture in the air.

Looking at the dew point, we can see that for the month of September, you can expect that Bonaire will have a low humidty, and will feel very comfortable.

January is the month with the most comfort. It will have very dry air, and can feel somewhat uncomfortable for some people. But will be fine for most.. July is the most uncomfortable month. It will have a very high humidity, and can feel very uncomfortable. In the graph, you can see that there is a significant difference between the most comfortable and most uncomfortable months

Is September a good time to go to Bonaire?

Trying to answer the question of whether September is a good time to go to Bonaire is not as easy as it first seems. Some people like colder weather, and others prefer a warmer climate. Some are fine with some humidity, and others are not. If your location has air conditioning, the night temperature is less important.

These are some examples. I will try to answer the question with a more generic person in mind. The more detailed information in this article should be enough to check further if this applies to you as well.

If we look at the average temperature for Bonaire in September, we can see that it will be too hot for a lot of visitors. In September, you can expect it to be quite hot, with an average temperature of around 89°F / 32°C. As the humidty is low, it will feel very comfortable. During the night, it will be around 77°F / 25°C.

The number of overcast days is more than 5, but you can still the sun with around 7 sunny days and 17 partly sunny days.

The last aspect we will look at is rain. You can expect around 17 rainy days, with on average 1.8 inches / 45 mm of rain during September. More then 5 days rain per month makes the chance higher you will see some rain during a shorter stay. But a day with rain does not mean a day you can not enjoy.

We have looked at the average day temperature, the night temperature, humidity, the number of overcast days, and the rain. We think that September in Bonaire is not the most optimal destination. But that doesn't mean it is not a good time for you to go. As said before, each visitor has their own preferences when it comes to the weather.

Does it rain all day in Bonaire in September?

In Bonaire, it does not rain all day in September. You can expect around 17 rainy days, with on average 1.8 inches / 45 mm of rain during the month.

Another way of looking at the rain is the number of sunny days. For Bonaire, there are, on average 7 sunny days and 17 partly sunny days in September. That clearly shows that it is not raining all the time.

And, as for many tropical locations, rain can be short and heavy. This applies particularly during the rainy season. It means that the number of days with rain and the amount of rain can be high, but you will still see many lovely days with a short period of heavy rain.

Is September the rainiest month in Bonaire?

September is not the month with the most rainy days, and not the month with the most rain.

To answer what the rainiest month is in Bonaire, we will both look at the month with the most rain, and the month with the highest number of rainy days.

October is the month with the the highest number of rainiest days. On average, you can expect 21 days with rain. March is the month with the lowest number of rainy days, with aproximately 4 days.

October is the month with the most rain. This is not equal as the one with the most rainy days. On average, you can expect 3.8 inches / 97 mm of rain. March is the month with the least amount of rain. This is not the same month as the one with the lowest number of rainy days. You can expect approximately 0.3 inches / 7 mm of rain.

Is September the most sunniest month in Bonaire?

September is not the month with the most sunny days, not the month with the most partly sunny days, and it is not the month with the lowest number of overcast days.

To answer what the sunniest month is in Bonaire, we will of course look at the month with the most sunniest days, but also look at the month with the biggest number of days that are sunny or partly sunny.

February is the month with the highest number of sunny days. On average, you can expect 7 sunny days, and 17 partly suny days. November is the month with the lowest number of sunny days.

January and March are months with the highest number of sunny days and partly sunny days combined. While October is the month with the lowest number of sunny days and partly sunny days combined.

The last thing we will look at is the number of overcast days. February is the month with the lowest number of overcast days. While October is the month with the highest number of overcast days.

More information about Bonaire

Weather in Bonaire in other months

• Weather in Bonaire for January
• Weather in Bonaire for February
• Weather in Bonaire for March
• Weather in Bonaire for April
• Weather in Bonaire for May
• Weather in Bonaire for June
• Weather in Bonaire for July
• Weather in Bonaire for August
• Weather in Bonaire for October
• Weather in Bonaire for November
• Weather in Bonaire for December

What to do in Bonaire for each month

• What to do in January in Bonaire
• What to do in February in Bonaire
• What to do in March in Bonaire
• What to do in April in Bonaire
• What to do in May in Bonaire
• What to do in June in Bonaire
• What to do in July in Bonaire
• What to do in August in Bonaire
• What to do in September in Bonaire
• What to do in October in Bonaire
• What to do in November in Bonaire
• What to do in December in Bonaire