Vietnam Weather in September
In the north it is hot and very wet, with highs of 87°F (31°C). On the central coast it is hot and rainy, with highs of 87°F (31°C) and the sea at 87°F (30°C). In the south it is hot and very wet, with highs of 87°F (30°C) and the sea at 85°F (29°C). Rating: Mixed — even on the central coast rain is frequent.
Mixedrain is frequent
Climate normals checked September 29, 2026 · Source: Open-Meteo (ERA5) · How we calculate
Vietnam weather in September by region
| Region | Day high | Night low | Sea | Rainy days | Rainfall | Humidity |
|---|---|---|---|---|---|---|
| NorthHanoi, Ha Long | 87°F (31°C) | 77°F (25°C) | 87°F (30°C) | 22 | 13.7 in (348 mm) | 85% |
| Central coastDa Nang, Hoi An | 87°F (31°C) | 78°F (26°C) | 87°F (30°C) | 22 | 9.5 in (242 mm) | 83% |
| SouthHo Chi Minh City, Phu Quoc | 87°F (30°C) | 76°F (25°C) | 85°F (29°C) | 29 | 13.6 in (346 mm) | 86% |
What to know in September
September to November is typhoon season on the central coast (Da Nang, Hoi An, Hue). Watch storm warnings and keep a spare day for flights.
Checked September 29, 2026.
Flight time from the US
We're still checking flight times from JFK, LAX and SFO to Vietnam. This block will show them once our flight data is ready.
Other months in Vietnam
- Jan89°FJanuary: Excellent
- Feb92°FFebruary: Good
- Mar78°FMarch: Excellent
- Apr85°FApril: Excellent
- May89°FMay: Excellent
- Jun92°FJune: Good
- Jul91°FJuly: Good
- Aug91°FAugust: Good
- Sep87°FSeptember: Mixed
- Oct83°FOctober: Mixed
- Nov79°FNovember: Excellent
- Dec87°FDecember: Excellent
Excellent Good Mixed Off-season
Vietnam in September: FAQ
What's the weather like in Vietnam in September?
In the north it is hot and very wet, with highs of 87°F (31°C). On the central coast it is hot and rainy, with highs of 87°F (31°C) and the sea at 87°F (30°C). In the south it is hot and very wet, with highs of 87°F (30°C) and the sea at 85°F (29°C).
Is September a good time to visit Vietnam?
We rate September as Mixed. It can work, with caveats: even on the central coast rain is frequent.
Is September rainy season in Vietnam?
Driest on the central coast, with about 9.5 in (242 mm) of rain and 22 rainy days. In the north: 13.7 in (348 mm); In the south: 13.6 in (346 mm).
How does Vietnam in September compare to October?
October rates Mixed, September rates Mixed. In the best region, September brings highs of 87°F (31°C) and 9.5 in (242 mm) of rain; October brings 83°F (28°C) and 7.5 in (190 mm).
Where the data comes from
- Air temperature, rainfall, humidity — ERA5 reanalysis (Copernicus / ECMWF) via Open-Meteo, averaged over 2015–2024. Each region uses one point: the resort or city in its caption.
- Sea temperature — Open-Meteo Marine, average sea surface temperature for 2023–2026 (the source has no longer record yet).
- Rainy days — days with at least 1 mm (0.04 in) of rain. Reanalysis picks up light rain more often than weather stations, so treat this as an upper bound.
- Month rating — one rule for every destination, based on three factors: day highs (ideal 75–91°F / 24–33°C), monthly rainfall (ideal under 80 mm / 3.1 in) and, for beach regions, sea temperature (ideal 77°F / 25°C or warmer). All ideal means Excellent; one slightly weaker factor means Good. Mixed means heavy rain (150 mm / 5.9 in or more), highs above 97°F (36°C) or a sea below 70°F (21°C). Off-season means highs of 100°F (38°C) or more, cold below 54°F (12°C), over 350 mm (13.8 in) of rain, or several problems at once. A country's rating follows its best region, so check the regional table.
Checked September 29, 2026. Climate normals are refreshed yearly and the notes every 90 days. These are long-term averages, not a forecast: any given year can differ.
