What is the weather like in Nha Trang in September — is it rainy season?

September is described as the start of the transition period: from November, rain becomes more frequent and longer-lasting, winds strengthen, and afternoon waves are more common. This unsettled pattern can continue until spring, with either a dry sunny week or several rainy days in a row. In windy, humid weather temperatures can drop to around 25°C and feel cooler, while calm days are about 30°C.

One participant noted that in mid-September the chance of rain is still relatively low, and even if it rains, it's usually not heavy/torrential.

A traveler shared that they stayed in Nha Trang from September 20 for two weeks: there was rain, occasionally heavy with local flooding on 2–3 streets, but it didn't ruin the vacation — they swam even during rain.

September is a transitional month from dry to rainy season: rain is unpredictable, could fall in short bursts (10 minutes to an hour) a couple of times a day, or not at all. Prolonged multi-day rain is uncommon during this period.

Formally September isn't yet the rainy season, but you could still encounter rain — there are no guarantees. However, the chances of good weather in September are much higher than in November.

The rainiest months are November and December. In January there's much less rain, but the sea is often rough and it's not as hot.

This year (2026) rains unusually continued until June, even though the dry season officially starts in April — weather can vary a lot from year to year.

In November the sea gets very rough and typhoons are possible, unlike October, which is considered a transitional month with variable weather.

One commenter claims Nha Trang's weather is similar to Danang's, and in both places the rainy season starts already in September — differing from other views in the discussion.

A traveler asking about early September — based on others' experience, rain is still rare at that time and the weather is generally fine.

The second half of September and October are considered among the best times to visit: heat eases, fewer tourists, and rain is still light. February–March is also a good period.

In March, rain can last several days in a row (up to 5 days), while in September it may rain only a couple of times total. Heavy rains typically start closer to November.

April is a transitional period with waves, rain, and possible beach debris — it marks the beginning of the off-season.

A trip from October 20 to November 20 showed great weather for the first three weeks, with storms and flooding only in the final week of November.

May and September see price drops on tours — good time to find last-minute deals. Peak season (June–August) has the highest prices.

Nha Trang's rainy season runs from October to March. Summers are hot and sunny with possible brief downpours. Summer is generally high season.

High season runs from March to August. From September, the low season begins with the possibility of prolonged rain.