Cat Ba Island weather in September
Warm and pleasant, with frequent heavy rain. Average highs of 29°C and lows of 26°C, with around 21 rainy days expected throughout the month.
While September isn't our top-rated month for Cat Ba Island, it has its own appeal — typically lower prices, fewer crowds, and a more local feel.
Average high
29°C
Average low
26°C
Rainy days
21 days
Best months to visit
March, April, October, November, December
What to do in Cat Ba Island in September
Whatever the weather, Cat Ba Island rewards curious visitors. Here are some of the best ways to spend your time:
Kayak through Ha Long Bay limestone karsts
Rock climb dramatic Cat Ba cliff faces
Trek Cat Ba National Park jungle trails
Visit Hospital Cave from Vietnam War era
Relax on beaches with water sports
Explore Cat Ba Town's bustling harbor
What to pack for September
Light layers work well — T-shirts and shorts for the day, a light jacket for evenings. Comfortable walking shoes are a must. Bring a compact umbrella just in case.
Browse other months
January
19C
Mild and comfortable, with occasional showers.
February
19C
Mild and comfortable, with occasional showers.
Recommended
March
23C
Mild and comfortable, with some rainy days.
Recommended
April
26C
Warm and pleasant, with some rainy days.
May
29C
Warm and pleasant, with regular rainfall.
June
31C
Hot and humid, with regular rainfall.
July
30C
Hot and humid, with frequent heavy rain.
August
30C
Hot and humid, with frequent heavy rain.
September (you are here)
29C
Warm and pleasant, with frequent heavy rain.
Recommended
October
27C
Warm and pleasant, with some rainy days.
Recommended
November
24C
Mild and comfortable, with occasional showers.
Recommended
December
20C
Mild and comfortable, with occasional showers.
Book your September trip to Cat Ba Island
Find hotels, tours and experiences for the perfect escape.
