Vietnam
Hoi An in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Hoi An in September is climatically mixed. The average daily high is around 30 °C, and the sea is about 29 °C. With about 23 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
52/100 · #11
Warmth
#6
Dryness
#11
Sun
#6
Sea warmth
#3
Published best categories: none
Hoi An · SeptemberPhoto: Steffen Schmitz (more photos) · CC BY-SA 4.0Climate facts
- Average high
- 30 °C
- Average low
- 25 °C
- Sea
- 29 °C
- Rainy days (est.)
- 23 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 83 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 32 | 26 | 18 | 154 | 7.2 | 79 | 1.5 | 30 | 50 |
| September (selected) | 30 | 25 | 23 | 400 | 6.2 | 83 | 1.8 | 29 | 52 |
| October | 28 | 24 | 25 | 661 | 5.2 | 86 | 2.4 | 28 | 58 |
How do the previous and next months compare?
Baseline: September (52/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | -2 | +1.6 °C | +0.5 °C | -4.3 | -245.2 mm | +1 h | -3.7 % | -0.2 m/s | +0.4 °C |
| October | +6 | -2 °C | -1.3 °C | +2.1 | +261.3 mm | -1 h | +2.6 % | +0.6 m/s | -1.3 °C |
All twelve months in context
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Where to stay in Hoi An
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Useful next decisions
Frequently asked questions
How warm is Hoi An in September?
The average daily high is around 30 °C, with an average daily low of about 25 °C.
Can you swim in Hoi An in September?
The sea is about 29 °C (very warm).
Does it rain a lot in Hoi An in September?
The curated estimate is about 23 rainy days per month, not a directly measured long-term average. Total precipitation averages around 400 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Hoi An?
By the climate score, January, February, March and April are the strongest months for Hoi An. For a beach trip: January, February, March and April. September is not among them.