Last updated: August 28, 2025
In May, Cat Ba, Vietnam experiences a tropical climate characterized by warm temperatures and a touch of humidity. Daytime highs can reach up to 33°C (92°F), while average temperatures hover around a pleasant 27°C (81°F). The evenings offer a respite with minimum temperatures of 20°C (69°F). However, be prepared for frequent rain, as the area sees approximately 139 mm (5.5 in) of precipitation over about 15 days throughout the month. With humidity levels at 73%, visitors can expect a lush, vibrant environment, perfect for exploring the island's natural beauty, despite the occasional shower.
May marks a vibrant transition into summer on Cat Ba Island, Vietnam, with temperatures rising significantly compared to earlier months. The minimum temperature begins at a warm 20°C (69°F), while the average climbs to a comfortable 27°C (81°F), peaking at a sizzling 33°C (92°F). This trend of increasing warmth signals the perfect opportunity for outdoor adventures and explorations, as the island's lush landscapes and clear waters beckon. As the month progresses, you can expect the balmy days to set the stage for unforgettable experiences, with the summer sun making its prominent debut. Whether you're kayaking through emerald waters or relaxing on sun-kissed beaches, May offers an ideal climate to fully embrace the natural beauty of Cat Ba.
May is a significant transition month for precipitation in Cat Ba, Vietnam, with total rainfall reaching 139 mm (5.5 in)—more than the previous months combined. This increase is marked by noticeable humidity as rain falls on an average of 15 days, indicating frequent showers that nurture the region's lush landscapes. The gradual escalation in rainfall from April’s 84 mm (3.3 in) to May's levels signals the onset of the rainy season, paving the way for an even wetter June. As daylight hours stretch, this precipitation supports both the vibrant flora and the area’s thriving ecosystems, showcasing the dynamic climate of Cat Ba.
As May arrives in Cat Ba, Vietnam, the humidity levels reach 73%, reflecting a notable increase compared to the previous months. Following the generally lower humidity of April, this rise indicates the transition into the warmer season, setting the stage for the sultry summer months ahead. The trend becomes more pronounced in June, where humidity spikes to a steamy 81% and continues to escalate through the summer, peaking in July and August at a staggering 90% and 89% respectively. This gradual climb from the early months highlights the tropical climate's characteristic humidity, making May a precursor to the significantly humid conditions that define Cat Ba's summer.
In May, Cat Ba, Vietnam, experiences a very high UV Index of 12, categorized as extreme with a burn time of just 10 minutes. This trend reflects a consistent pattern from April, where the UV levels peak similarly, signaling a significant risk for skin damage with minimal sun exposure. As spring transitions into summer, the intensity of UV radiation remains elevated, highlighting the need for sun protection during outdoor activities. Visitors should anticipate similar extreme UV conditions in the following months, making it crucial to stay informed and proactive regarding sun safety. For more detailed insights on UV levels throughout the year, explore Cat Ba UV Index.
UV Risk Categories
May in Cat Ba, Vietnam, shines brightly with an impressive 312 hours of sunshine, marking the peak of daylight before the summer months settle in. This vibrant month not only surpasses previous spring weeks, like April's 263 hours, but also sets a sun-soaked tone that continues through early summer, with June following closely at 302 hours. As one observes the year’s progression, it’s evident that May emerges as a delightful highlight, offering an inviting backdrop for outdoor adventures and exploration. The shifting patterns throughout the months showcase a gradual increase in daylight, revealing Cat Ba's charm under the sun, making it a perfect getaway for sun-seekers and nature enthusiasts alike.
In Cat Ba, Vietnam, the likelihood of experiencing sunny weather in May stands at 38%, a slight dip from earlier months like February, which boasts a sunny chance of 59%. As the region transitions from the cooler, clearer days of winter to the warmer months, May sees a noticeable decrease compared to the more promising start of the year. This trend continues into the summer, with peaks in sunny days occurring in January and February before tumbling to a low of 15% by June. May presents a transitional phase, offering some sunny moments but also hinting at the cloudier, wetter days that typically follow.
In Cat Ba, Vietnam, May heralds the onset of longer days, with 13 hours of daylight illuminating the vibrant landscape. This increase marks a significant shift from the more modest 11 hours seen earlier in the year, as the transition from winter to spring takes shape. Following May, daylight remains generous through June and July, maintaining that same 13-hour duration, ideal for exploring the stunning natural beauty of the region. As summer wanes into August, the daylight gradually recedes to 12 hours, signaling the approach of the cooler months. Overall, the rhythm of daylight in Cat Ba showcases a clear trend toward longer days in spring and early summer, making May an exceptional time for visitors to embrace the island's enchanting atmosphere.
In May, Cat Ba, Vietnam experiences a notable uptick in wind activity, with an average wind speed of 5.5 m/s (12 mph)—a welcome shift that hints at the approaching summer. This marks an increase from the preceding months, where the winds hovered between 3.6 m/s (8 mph) and 4.3 m/s (10 mph). As the month progresses, the wind continues to gain momentum, peaking in June at 5.7 m/s (13 mph) before slightly tapering off in the hotter summer months. This trend reflects the transition to a breezier climate, creating ideal conditions for outdoor adventures and water sports, making May a delightful time to enjoy Cat Ba's stunning landscapes.
Weather in Cat Ba varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Cat Ba, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present distinctly different weather patterns. In May, temperatures soar with minimums around 20°C (69°F) and average highs reaching up to 33°C (92°F), creating a warm environment that often feels humid with 73% humidity. This month also sees considerable rainfall, totaling 139 mm (5.5 in) over about 15 days. In contrast, January offers a much cooler climate, featuring a minimum temperature of 10°C (50°F) and a maximum of 24°C (75°F), along with significantly less precipitation at 34 mm (1.3 in) over just 7 days and lower humidity at 66%. For those interested in detailed insights, you can check out Cat Ba weather in January.
May and February present contrasting weather conditions. In May, temperatures are significantly higher, with a minimum of 20°C (69°F) and an average reaching 27°C (81°F), peaking at a sizzling 33°C (92°F). The month is also marked by increased precipitation, with 139 mm (5.5 in) falling over 15 days, resulting in a humid atmosphere at 73%. In comparison, February experiences much milder temperatures, ranging from a minimum of 9°C (49°F) to an average of 18°C (65°F), and a maximum of 24°C (75°F). Precipitation is notably lower during this month, with only 36 mm (1.4 in) recorded over 7 days, accompanied by a humidity level of 71%. For a more detailed look at the February weather, check out Cat Ba weather in February.
When comparing the weather conditions in May and March, it is evident that May experiences warmer temperatures with a minimum of 20°C (69°F) and an average of 27°C (81°F), reaching a maximum of 33°C (92°F). In contrast, March's temperatures are cooler, with a minimum of 16°C (60°F) and an average of 21°C (70°F), peaking at 27°C (80°F). Additionally, May receives significantly more precipitation, totaling 139 mm (5.5 in) over 15 days, compared to March's 50 mm (2.0 in) over 13 days. Humidity levels are slightly higher in May at 73%, compared to 69% in March. For more details, check Cat Ba weather in March.
In comparison to April, May experiences warmer temperatures with a minimum of 20°C (69°F), an average of 27°C (81°F), and a maximum of 33°C (92°F), while April has a minimum of 16°C (61°F), an average of 24°C (75°F), and a maximum of 29°C (85°F). Additionally, May is wetter, receiving 139 mm (5.5 in) of precipitation over 15 days, compared to April's 84 mm (3.3 in) over 11 days. The humidity in May is also higher at 73%, in contrast to April's 64%. For a more detailed look at the weather conditions during this month, you can check Cat Ba weather in April.
In comparing May and June weather, it's clear that June offers warmer temperatures, with a minimum of 24°C (76°F) and an average of 30°C (86°F), compared to May's minimum of 20°C (69°F) and an average of 27°C (81°F). While both months experience a similar number of rainy days, June sees an increase in precipitation, totaling 194 mm (7.6 in) compared to May's 139 mm (5.5 in). Additionally, humidity levels rise slightly from 73% in May to 81% in June, making the air feel even more humid during the month. For a closer look at June weather patterns in more detail, visit Cat Ba weather in June.
In comparison to May, July experiences slightly higher temperatures, with an average of 29°C (85°F) compared to May's 27°C (81°F). While both months can reach a maximum of 33°C (92°F), July tends to feel warmer due to increased humidity, which rises from 73% in May to 90% in July. Additionally, July sees a significant increase in rainfall, with 325 mm (12.8 in) over 21 days, compared to 139 mm (5.5 in) over 15 days in May. For those interested in more detailed information, you can check Cat Ba weather in July.
Comparing the weather in May and August reveals some significant differences. In May, temperatures range from a minimum of 20°C (69°F) to a maximum of 33°C (92°F), with an average of 27°C (81°F). The month experiences moderate rainfall, totaling 139 mm (5.5 in) over about 15 days, and humidity sits at 73%. In contrast, August sees higher temperatures, with a minimum of 25°C (78°F) and a maximum of 34°C (93°F), averaging 29°C (85°F). However, it is also much wetter, with 567 mm (22.3 in) of rain spread over 25 days and increased humidity at 89%. This change in weather patterns highlights a transition from mild and relatively dry conditions in May to hot and humid weather with significant rainfall in August. For a detailed breakdown, check out Cat Ba weather in August.
May and September present distinct weather patterns, despite having similar maximum temperatures. In May, temperatures range from a minimum of 20°C (69°F) to a maximum of 33°C (92°F), with an average of 27°C (81°F). The month experiences considerable rainfall, totaling 139 mm (5.5 in) over about 15 days, and humidity levels are relatively high at 73%. In contrast, September sees warmer minimum temperatures starting at 25°C (78°F) and a slightly higher average of 29°C (84°F). Rainfall significantly increases, reaching 312 mm (12.3 in) across 23 days, and the humidity also rises to 82%. For more information on the weather specifics in September, check out Cat Ba weather in September.
May and October showcase similar warm climates, with average temperatures around 27°C (81°F) and 26°C (79°F) respectively. However, May tends to be slightly hotter, with maximum temperatures reaching up to 33°C (92°F), compared to October's peak of 32°C (90°F). Precipitation in October is significantly higher, totaling 284 mm (11.2 in) over 17 days, while May experiences 139 mm (5.5 in) over 15 days. Additionally, October's humidity is marginally higher at 77% compared to May's 73%. For more information on October weather conditions, you can check Cat Ba weather in October.
May and November present contrasting weather patterns, highlighting the transition from spring to autumn. In May, temperatures range from a minimum of 20°C (69°F) to a maximum of 33°C (92°F), with an average of 27°C (81°F), creating warm and often humid conditions with high rainfall averaging 139 mm (5.5 in) over approximately 15 days. In stark contrast, November features cooler temperatures, with a minimum of 14°C (57°F) and a maximum of 28°C (83°F), averaging 23°C (74°F). Additionally, November experiences significantly less precipitation, around 53 mm (2.1 in) over about 10 days, coupled with a humidity level of 72%. For a more detailed look at November weather, you can check Cat Ba weather in November.
In May, temperatures soar with a minimum of 20°C (69°F) and an average around 27°C (81°F), peaking at a hot 33°C (92°F). This month also experiences considerable rainfall, with 139 mm (5.5 in) spread over 15 days, resulting in a humid environment with an average humidity of 73%. In contrast, December offers a much cooler climate, with temperatures ranging from a minimum of 10°C (50°F) to an average of 19°C (67°F), and a maximum of 26°C (80°F). The precipitation is notably lower at 42 mm (1.6 in) over just 8 days, and humidity is slightly lower at 71%. For more detailed insights into December weather features, visit Cat Ba weather in December.
As May unfolds in Cat Ba, temperatures warm up, offering a delightful blend of sunny days and mild evenings, making it a perfect month for outdoor activities. With an average temperature hovering around 27°C (81°F), visitors can expect a pleasant climate, though occasional rainfall can occur, contributing to a total precipitation of around 139 mm over approximately 15 days. Compared to the cooler, rainier months preceding it, May stands out with increased humidity of 73%, providing a lush and vibrant environment. For those keen on exploring Cat Ba's natural beauty, the may weather provides a unique charm that sets it apart from the rest of the year. Discover more about the climate you can expect by visiting Cat Ba Climate.