Temperature
Hot by day, warm at night.
87°Ftypical September high
Typical range
September climate
September in Hoi An
Vietnam · Southeast Asia
Typhoon risk near peak and humid air are the main limitations.
Wet but workable
Daytime high
87°F
Lows around 78°F
Rain
Rain most days
Sun
6 h/day
Air feel
Very humid
Sea temp
85°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
It rains on most days, with a mix of brief and longer spells. About 23 wet days, more than in most months.
77%wet-day frequency
AmountWet-day chance
Sunshine
Cloudier spells limit sunshine.
5.9 hSeptember sunshine
Heat & humidity by month
Very humid air is a major factor this month.
89%September Heat feel
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 93° and nights feel near 89°.
ComfortableWarmHotSwelteringNight hours
Clear sky
Mostly cloudy skies this month.
22%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
5 mphSeptember Calm
Sea temperature
85°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 84°F, and early evening stays near 83°F.
Avg temp Typical range
Morning85°F
Feels 93°F
Rain35%
Cloud77%
Humid airVery high
Sun intensityModerate
Midday86°F
Feels 94°F
Rain53%
Cloud77%
Humid airVery high
Sun intensityStrong
Late afternoon85°F
Feels 93°F
Rain64%
Cloud77%
Humid airVery high
Sun intensityLow
Early evening82°F
Feels 92°F
Rain51%
Cloud80%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 75 | 68 | 6.7 | 18 | 4.5 | 86 | 73 |
| Feb | 77 | 69 | 3.4 | 12 | 5.1 | 87 | 72 |
| Mar | 81 | 72 | 3.2 | 10 | 6.1 | 88 | 74 |
| Apr | 86 | 76 | 3.0 | 9 | 7.0 | 86 | 78 |
| May | 90 | 79 | 4.4 | 15 | 7.9 | 82 | 83 |
| Jun | 92 | 81 | 3.5 | 14 | 8.0 | 77 | 85 |
| Jul | 92 | 80 | 5.1 | 16 | 8.2 | 76 | 85 |
| Aug | 91 | 80 | 5.8 | 19 | 7.0 | 77 | 85 |
| Sep | 87 | 78 | 12.7 | 23 | 5.9 | 82 | 85 |
| Oct | 82 | 75 | 17.0 | 25 | 4.7 | 85 | 83 |
| Nov | 80 | 73 | 18.1 | 22 | 4.0 | 86 | 80 |
| Dec | 75 | 70 | 14.3 | 24 | 3.3 | 85 | 76 |
Similar climates
Similar
Similar travel styleDa NangVietnamSimilar travel styleKaohsiungTaiwanSimilar travel stylePuducherryIndiaSimilar travel styleChennaiIndia
Want a side-by-side climate view? Compare Hoi An with Da Nang.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology