Island in Hai Phong, Vietnam
Cat Ba weather by month and the best time to visit
When to go to Cat Ba
Apr–May and Oct–Nov are mild and clear. Jun–Aug is hot, wet and crowded with local families; typhoon risk is highest Jul–Sep, and winter is cold and foggy.
Cat Ba weather by month
Average daily high, rainfall and conditions.
- Jan19°37 mm
- Feb20°23 mm
- Mar22°47 mm
- Apr25°63 mm
- May28°169 mm
- Jun30°210 mm
- Jul30°302 mm
- Aug30°355 mm
- Sep30°283 mm
- Oct28°138 mm
- Nov25°59 mm
- Dec21°31 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 19°C66°F | 16°C61°F | 37 mm | 81% | Pleasant |
| February | 20°C68°F | 17°C63°F | 23 mm | 85% | Pleasant |
| March | 22°C71°F | 19°C67°F | 47 mm | 87% | Pleasant |
| April | 25°C77°F | 22°C72°F | 63 mm | 88% | Pleasant |
| May | 28°C83°F | 26°C79°F | 169 mm | 86% | Rainy |
| June | 30°C86°F | 28°C83°F | 210 mm | 85% | Rainy |
| July | 30°C86°F | 28°C83°F | 302 mm | 83% | Very wet |
| August | 30°C86°F | 28°C83°F | 355 mm | 82% | Very wet |
| September | 30°C85°F | 27°C81°F | 283 mm | 80% | Rainy |
| October | 28°C82°F | 25°C77°F | 138 mm | 77% | Pleasant |
| November | 25°C76°F | 22°C71°F | 59 mm | 77% | Pleasant |
| December | 21°C69°F | 18°C64°F | 31 mm | 76% | Pleasant |
Best months across Vietnam
| Place | Best months | Warmest month |
|---|---|---|
| Ho Chi Minh City | Dec–Mar | Mar (37°C) |
| Hanoi | Mar–Apr, Oct–Nov | Jun (32°C) |
| Da Nang | Feb–Jun | Jun (33°C) |
| Hoi An | Feb–May | Jun (32°C) |
| Ha Long Bay | Mar–Apr, Oct–Nov | Jun (31°C) |
| Nha Trang | Jan–Jun | May (30°C) |
| Phu Quoc | Nov–Mar | May (30°C) |
| Sapa | Mar–May, Sep–Oct | Jun (26°C) |
| Hue | Feb–May | Jun (33°C) |
| Ninh Binh | Mar–May, Sep–Oct | Jun (32°C) |
| Da Lat | Dec–Mar | Apr (25°C) |
| Ha Giang | Mar–Apr, Sep–Nov | May (34°C) |
| Mui Ne | Nov–Apr | Apr (33°C) |
| Phong Nha | Mar–Jul | May (34°C) |
| Cat Ba | Apr–May, Oct–Nov | Jul (30°C) |
| Vung Tau | Nov–Apr | Apr (34°C) |
| Quy Nhon | Feb–Jun | Aug (31°C) |
| Can Tho | Dec–Apr | Apr (36°C) |
| Con Dao | Mar–Jul | May (29°C) |
| Cao Bang | Apr, Sep–Nov | May (31°C) |
| Mai Chau | Mar–Apr, Sep–Nov | May (34°C) |
Quick answers
What is the best month to visit Cat Ba?
Apr–May, Oct–Nov. Apr–May and Oct–Nov are mild and clear. Jun–Aug is hot, wet and crowded with local families; typhoon risk is highest Jul–Sep, and winter is cold and foggy.
When is the rainy season in Cat Ba?
Rain peaks in August with about 355 mm. Months with 150 mm or more: May–Sep.
What is the hottest month in Cat Ba?
July, with average highs of 30°C (86°F).
How cold does Cat Ba get?
The coolest nights are in January, averaging 16°C (61°F).
More about Cat Ba
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Sources
- NASA POWER climatology (2001–2020)
- Vietnam National Authority of Tourism
- Vinmec International Hospital
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.