September Weather in Nuevo Vallarta, Mexico - 2025

Located in the state of Nayarit, Nuevo Vallarta is a planned residential resort, north of Puerto Vallarta, on Mexico's Pacific coast. It is perfectly placed between the rugged Sierra de Vallejo mountains and the vast Pacific Ocean.  It is known for its long stretch of sandy beaches, a marina, biodiversity, and beautiful golf courses. It isn't far from the Banderas bay is the quiet village of Sayutita in the Northwest.

As a resort town, it has a small population of less than five thousand. Many businesses, stores, and malls accept U.S dollars or Mexican Pesos. English and Spanish are widely spoken. What began as a project by the Mexican government over twenty years ago, has flourished to be a thriving location for snowbirds looking to enjoy luxurious villas, estates, canals, gardens, beaches, warm tropical climate, and other interesting activities.

September weather in Nuevo Vallarta Mexico

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

Generally, September in Nuevo Vallarta will be quite hot. Historical data shows that you can expect an average temperature of around 89°F / 32°C. But due to the extreme humidity it can feel extremely uncomfortable. During the night, it will cool down to around 78°F / 26°C. Many will prefer a location with air conditioning due to the night temperature, and the high humidity level.

Nuevo Vallarta has its share of rainy days in September. You can expect around 26 rainy days, with on average 10.7 inches / 272 mm of rain during the whole month.

September weather in Nuevo Vallarta Mexico in more detail

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

- What will the temperature be in Nuevo Vallarta in September

Generally, you can expect in September an average temperature of 89°F / 32°C during the day and an average of 78°F / 26°C during the night. In September, during the warmest part of the afternoon, the temperature can often get as high as 98°F / 37°C, and at the end of the night, it can get as low as 73°F / 23°C.

When looking at the whole year, September is the coldest month, with an average temperature of around 89°F / 32°C. May is the hottest month, with an average temperature of around 100°F / 38°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 91°F / 33°C. And almost equal to October, which sees an average maximum temperature of around 93°F / 34°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, April and May are the hottest months, with a temperature of around 104°F / 40°C. January, November and December are the coldest months, with a temperature of around 96°F / 36°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 98°F / 37°C. And equal to October, which sees an average maximum temperature of around 98°F / 37°C.

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

- Can you expect rain in September in Nuevo Vallarta?

Generally, you can expect about 26 rain days in September, with on average 10.7 inches / 272 mm of rain.

When looking at the whole year, March is the dryest month, with an average rainfall of around 0.2 inches / 4 mmmm. July is the wettest month, with an average rainfall of around 12.7 inches / 322 mmmm. When comparing September with the month before and after, this is a lot less than August, which sees around 11.5 inches / 293 mm of rain. And a lot more than October, which sees around 4.3 inches / 110 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 an average of between 0 and 1 days. July and August And are the months with the most rain days with an average of between 29 and 30 days When comparing September with the month before and after, this is slightly less than August, which sees an average of between 29 and 30 days of rain. And a lot more than October, which sees around 15 days of rain

- What will the water temperature be in Nuevo Vallarta for September

You can expect in September, the water temperature for Nuevo Vallarta to be between 87°F / 31°C and 84°F / 29°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 87°F / 31°C and 89°F / 32°C. March has the lowest water temperature, with around 78°F / 26°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 around 87°F / 31°C. And almost equal to the water temperature from October, that is an average of between 87°F / 31°C and 89°F / 32°C.

- Can you expect in September a lot of sunny days in Nuevo Vallarta

Generally, you can expect around 2 sunny days in September and around 13 partly sunny days. The remaining days will be cloudy.

When looking at the whole year, March and November And are the months with the higest number of sunny days, with around 21 sunny days. July and August And are the months with the lowest number of sunny days, with an average of between 0 and 1 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 0 and 1 sunny days. And less than October, with around 11 sunny days

We have looked at the sunny days in Nuevo Vallarta. Let's also look at the cloudy or overcast days. August is the month with the highest number of cloudy days, with an average of between 16 and 17 cloudy days. May is the month with the lowest number of cloudy days, with an average of between 1 and 2 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 16 and 17 cloudy days. And more than October, with an average of between 6 and 7 cloudy days

- Will it be comfortable in September in Nuevo Vallarta?

Generally, September in Nuevo Vallarta will be extremely humid, and can feel extremely uncomfortable.

We use the humidity and temperature in Nuevo Vallarta 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, February has the lowest humidity, with a Wintersun Expert comfort level of "comfortable" (not very humid). July and August And have the highest humidity, with a Wintersun Expert comfort level of "extremely uncomfortable" (extremely humid). When comparing September with the month before and after, this is almost equal to August, which has a Wintersun Comfort level of "extremely uncomfortable" (extremely humid). And slightly more than October, which has a Wintersun Comfort level of "slightly uncomfortable" (moderately humid)

What to do in Nuevo Vallarta Mexico in September

• The Caguma Turtles: When winter comes, these turtles lay their eggs on Nuevo Vallarta's sandy beaches. Since 1978, the Caguama turtles have been on the brink of extinction. They are cherished by the locals.
• El Cora Crocodile Sanctuary: Snowbirds can get to see fierce crocodiles in their natural habitats. Guided tours are usually organized, and they are inexpensive.
• Dolphin Discovery Vallarta: This is a Dolphin Sanctuary and waterpark. You can see trained dolphins perform some stunts, swim in the water, or just take pictures.

Is it humid in Nuevo Vallarta Mexico in September?

A lot of people ask interested in the humidity or relative humidity for Nuevo Vallarta Mexico 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 Nuevo Vallarta, 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 Nuevo Vallarta 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 Nuevo Vallarta will be extremely humid, and can feel extremely uncomfortable.

February is the month with the most comfort. It will not be very humid, and will feel comfortable. July and August are the most uncomfortable months. It will be extremely humid, and can feel extremely uncomfortable. In the graph, you can see that there is some difference between the most comfortable and most uncomfortable months

Is September a good time to go to Nuevo Vallarta Mexico?

Trying to answer the question of whether September is a good time to go to Nuevo Vallarta 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 Nuevo Vallarta 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. But due to the extreme humidity it can feel extremely uncomfortable. During the night, it will be around 78°F / 26°C.

The number of overcast days is more than 5, but you can still the sun with around 2 sunny days and 13 partly sunny days.

The last aspect we will look at is rain. You can expect around 26 rainy days, with on average 10.7 inches / 272 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 Nuevo Vallarta Mexico 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 Nuevo Vallarta Mexico in September?

In Nuevo Vallarta, there are a lot of rainy days in September. You can expect around 26 rainy days, with on average 10.7 inches / 272 mm of rain during the month.

Another way of looking at the rain is the number of sunny days. For Nuevo Vallarta Mexico, there are, on average 2 sunny days and 13 partly sunny days in September. That clearly shows that it is not raining all the time.

Is September the rainiest month in Nuevo Vallarta Mexico?

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 Nuevo Vallarta, we will both look at the month with the most rain, and the month with the highest number of rainy days.

July and August are the months with the the highest number of rainiest days. On average, you can expect 29 days with rain. March is the month with the lowest number of rainy days, with aproximately 1 day.

July and August are the months with the most rain. These are not equal to the months with the most rainy days. On average, you can expect 12.7 inches / 322 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 0.2 inches / 4 mm of rain.

Is September the most sunniest month in Nuevo Vallarta Mexico?

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 Nuevo Vallarta, 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.

March and November are the months with the highest number of sunny days. On average, you can expect 2 sunny days, and 13 partly suny days. July and August are the months with the lowest number of sunny days.

May is the month with the highest number of sunny days and partly sunny days combined. While August 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. May is the month with the lowest number of overcast days. While August is the month with the highest number of overcast days.

More information about Nuevo Vallarta Mexico

Weather in Nuevo Vallarta Mexico in other months

• Weather in Nuevo Vallarta Mexico for January
• Weather in Nuevo Vallarta Mexico for February
• Weather in Nuevo Vallarta Mexico for March
• Weather in Nuevo Vallarta Mexico for April
• Weather in Nuevo Vallarta Mexico for May
• Weather in Nuevo Vallarta Mexico for June
• Weather in Nuevo Vallarta Mexico for July
• Weather in Nuevo Vallarta Mexico for August
• Weather in Nuevo Vallarta Mexico for October
• Weather in Nuevo Vallarta Mexico for November
• Weather in Nuevo Vallarta Mexico for December

What to do in Nuevo Vallarta Mexico for each month

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