Last updated: August 28, 2025
January in Lang Son, Vietnam presents a refreshing climate characterized by a maximum temperature of 27°C (80°F) and an average of 15°C (59°F), dipping to a minimum of 4°C (40°F) at night. This month experiences an average precipitation amount of 55 mm (2.2 in), falling over approximately 11 days. With a notable humidity level of 66%, the weather can feel quite crisp, making it a unique time to explore the region's natural beauty and cultural heritage. Visitors should prepare for occasional rain while enjoying the mild temperatures that make January a delightful month in Lang Son.
In Lang Son, Vietnam, January brings a refreshing chill with nighttime temperatures dipping to a brisk 4°C (40°F), while the day can warm up to a comfortable 27°C (80°F). The average temperature hovers around 15°C (59°F), marking the beginning of the year's mild climatic transition. As the month progresses into February, a subtle warming trend emerges, with minimum temperatures edging up to 5°C (41°F) and daily averages reaching 16°C (61°F). The increase continues in March and April, where daytime highs can soar to 32°C (89°F) and 34°C (93°F) respectively. This gradual rise signals a shift towards the warmer months ahead, yet the refreshing coolness of January sets a serene tone, making it an ideal time for visitors to explore the natural beauty and charm of the region without the oppressive heat that follows.
In Lang Son, Vietnam, January ushers in the new year with modest precipitation, recording 55 mm (2.2 in) of rain over 11 days. This sets the stage for a gradual increase in rainfall as the months progress, with precipitation rising to 57 mm in February and soaring to 92 mm by March. Notably, the late spring and summer months witness a significant uptick, peaking in August with a remarkable 346 mm (13.6 in) spread across 28 days of rainfall. This trend underscores a distinct seasonal shift, where the dry spell of late fall and early winter gives way to a lush, wet landscape, fostering the vibrant growth characteristic of Lang Son’s climate. As the year unfolds, the pattern showcases a dynamic interplay between rain and temperature, culminating in a humid and lively summer atmosphere before the drier months return in November and December.
In January, Lang Son, Vietnam experiences a relative humidity of 66%, setting the stage for a cooler and more comfortable beginning to the year. As the months progress, humidity gradually increases, peaking in the warm summer months of July and August at a steamy 90% and 89%, respectively. This upward trend underscores the region's transition from the drier, cooler winter into the muggy days of summer. Interestingly, starting from May when humidity reaches 73%, the air becomes increasingly damp, consistently hovering above 70% through to October. As autumn arrives, humidity begins to ease, dropping back to 72% in November and slightly further to 71% in December, signaling a gradual return to the more pleasant, cooler conditions experienced at the start of the year. Overall, the humidity in Lang Son illustrates a distinct seasonal rhythm, highlighting the significant shift from winter's crispness to the sweltering heat of the summer months.
In Lang Son, Vietnam, January marks the beginning of the year with a UV Index of 8, indicating a very high exposure level, where just 15 minutes in the sun can lead to skin burns. As the months progress toward summer, there's a noticeable uptick in UV intensity—February sees an increase to 10, and by March, it reaches 12 with an extreme exposure category that shortens the burn time to just 10 minutes. The peak occurs in August when the UV Index hits 14, maintaining a 10-minute burn time throughout much of the summer months. This pattern highlights an alarming trend in UV exposure, especially during the warmer months, before tapering off to safer levels by December with a UV Index of 7. For more information on the fluctuating UV levels throughout the year, visit Lang Son UV Index.
UV Risk Categories
In Lang Son, Vietnam, January marks the start of the year with 151 hours of sunshine, laying the foundation for a gradual increase in daylight as the months unfold. By February, residents and visitors can bask in 201 hours of radiant sun, hinting at the approaching warmth of spring. As the temperatures rise, March offers 172 hours, followed by a vibrant April with 216 hours, showcasing the growing intensity of sunlight. The peak of sunshine arrives in May, with a dazzling 297 hours, establishing it as a sun-filled oasis. This trend of abundant sunlight continues through the summer months, with slight variations, leading into a cozy autumn with hours remaining high in September at 285 hours. As the year winds down, sunshine gradually decreases, but the warmth of Lang Son lingers, making it a captivating destination throughout the changing seasons.
In Lang Son, Vietnam, January boasts a 41% chance of sunny weather, making it one of the brighter months of the year. This month stands out in contrast to the following months, such as February, with a slightly lower 38% sunlight likelihood, and the wetter March, which sees a sharp decline to 18%. Interestingly, as the year progresses into the sweltering summer months, sunshine becomes less predictable; for instance, June dips to a mere 13% probability of sunshine. By December, the weather begins to shift again, with a noticeable 48% chance of sunny days, suggesting a seasonal pattern where late winter and early winter months may offer the best chances for enjoying clear skies in this picturesque region.
In Lang Son, Vietnam, the daylight duration experiences a captivating transformation throughout the year. Starting in January, residents enjoy 10 hours of daylight, which gradually increases as spring approaches, peaking at 13 hours in the lush months of May through July. This trend reflects the vibrant growth and warmth of summer, allowing for extended outdoor activities. As the year progresses into late summer and autumn, daylight begins to wane, returning to 12 hours in August and September, before settling back to 11 hours in October and November. Finally, the cycle completes itself as December and January return to 10 hours of daylight, reminding residents of the rhythm of nature. This ebb and flow of sunlight not only shapes the climate but also influences the lifestyle and culture of Lang Son's people throughout the seasons.
In January, Lang Son, Vietnam, experiences a gentle average wind speed of 2.8 m/s (6 mph), setting a calm tone for the year ahead. This light breeze gradually dips in February, reflecting a slight lull as the region transitions toward the more invigorating winds of spring. As March arrives, the winds pick up to 3.0 m/s (7 mph), hinting at the energy of the changing season. This trend continues into April, where the average speed slightly recedes to 2.9 m/s (6 mph), before reaching 3.3 m/s (7 mph) in May, perfectly complementing the burgeoning warmth. Come October, expect a notable shift, with the wind speed surging to 4.0 m/s (9 mph), heralding the arrival of autumn's more assertive gusts. By the year's end in December, the winds return to a familiar 2.8 m/s, completing a cycle of gentle to robust breezes, showcasing the rhythmic ebb and flow of Lang Son's climate.
Weather in Lang Son varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Lang Son, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February exhibit similar weather patterns, though February tends to be slightly warmer and more humid. In January, temperatures range from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), with an average of 15°C (59°F). February sees a small increase, with minimum temperatures rising to 5°C (41°F) and maximums reaching 28°C (83°F), averaging 16°C (61°F). Precipitation levels are comparable in both months, with January receiving 55 mm (2.2 in) and February slightly higher at 57 mm (2.2 in), both spread over 11 days. However, February's increased humidity at 71% compared to January's 66% indicates a shift towards a more humid atmosphere. For more details, visit Lang Son weather in February.
In January, the weather in Lang Son presents a mild climate with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), along with an average temperature of 15°C (59°F). This month experiences around 55 mm (2.2 inches) of precipitation over 11 days, with a humidity level of 66%.
In contrast, March brings a noticeable increase in warmth, featuring a minimum temperature of 9°C (48°F) and a maximum of 32°C (89°F), with an average temperature of 20°C (68°F). However, it is also wetter, receiving 92 mm (3.6 inches) of rain over 21 days and slightly higher humidity at 69%. For more details on the weather specifics, you can check Lang Son weather in March.
In January, the weather is relatively mild with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (80°F) and an average of 15°C (59°F). The month experiences around 55 mm (2.2 in) of precipitation over approximately 11 days, coupled with a humidity level of 66%. In contrast, April brings significantly warmer temperatures, with a minimum of 10°C (50°F), an average of 22°C (72°F), and a high of 34°C (93°F). This month also sees increased rainfall, totaling 117 mm (4.6 in) over 18 days, while the humidity remains slightly lower at 64%. For a detailed overview of April's weather, you can check Lang Son weather in April.
In January, the weather typically features milder temperatures with a minimum of 4°C (40°F) and an average of 15°C (59°F), peaking at 27°C (80°F). Precipitation is relatively low at 55 mm (2.2 in) over about 11 days, along with a humidity level of 66%. In contrast, May sees significantly warmer conditions, with a minimum temperature of 15°C (60°F) and an average of 26°C (78°F), reaching highs of 35°C (96°F). However, it also experiences greater precipitation, totaling 179 mm (7.1 in) across approximately 22 days, and comes with increased humidity at 73%. For more detailed information, visit Lang Son weather in May.
January and June exhibit stark contrasts in weather patterns. In January, temperatures range from a cooler minimum of 4°C (40°F) to a comfortable maximum of 27°C (80°F), with an average of 15°C (59°F). The month experiences moderate precipitation of 55 mm (2.2 in) over 11 days, accompanied by a humidity level of 66%. In contrast, June brings a significant increase in temperature, with a minimum of 20°C (69°F) and a peak reaching 37°C (100°F), averaging around 28°C (83°F). The month also sees a much higher precipitation total of 235 mm (9.2 in) over 21 days, along with increased humidity at 81%. For more detailed information about the weather during this month, you can visit Lang Son weather in June.
In January, the weather is generally mild, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), and an average of 15°C (59°F). With 55 mm (2.2 in) of precipitation over about 11 days, the humidity is relatively moderate at 66%. In contrast, July brings a substantial increase in heat and humidity. The temperatures during this month range from a minimum of 23°C (73°F) to a sizzling maximum of 35°C (96°F), with an average of 28°C (82°F). Precipitation also rises significantly, totaling 243 mm (9.6 in) across 23 days, while humidity climbs to a high 90%. For more details about the weather patterns specific to this month, you can visit Lang Son weather in July.
In January, the weather is mild, with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), and an average of 15°C (59°F). This month sees relatively low precipitation of 55 mm (2.2 in) spread over 11 days, resulting in a humidity level of 66%. In contrast, August experiences significantly warmer temperatures, with a minimum of 22°C (72°F) and a peak of 35°C (96°F), averaging at 27°C (81°F). The rainfall rises dramatically to 346 mm (13.6 in) over 28 days, contributing to a higher humidity of 89%. To learn more about the specific conditions during this time, check out Lang Son weather in August.
In January, the weather tends to be milder with temperatures ranging from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), averaging around 15°C (59°F). The month also experiences a relatively low level of precipitation, totaling 55 mm (2.2 in) over about 11 days, with humidity at 66%.
In contrast, September brings a significant rise in temperatures, with a minimum of 19°C (67°F) and a peak of 34°C (94°F), averaging 26°C (80°F). The month sees much heavier rainfall, accumulating 198 mm (7.8 in) over approximately 22 days, accompanied by increased humidity levels of 82%. For more detailed information on September weather in Lang Son, visit Lang Son weather in September.
When comparing the weather in January and October, we see significant differences. In January, temperatures range from a minimum of 4°C (40°F) to a maximum of 27°C (80°F), with an average temperature of 15°C (59°F). This month experiences relatively low precipitation at 55 mm (2.2 in) over 11 days, and humidity levels sit at 66%. In contrast, October boasts much warmer conditions, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 32°C (90°F) and an average temperature of 23°C (73°F). However, October is notably wetter, receiving 170 mm (6.7 in) of rain over 15 days and higher humidity at 77%. For a detailed look at the weather trends, check out Lang Son weather in October.
In January, the weather is generally cooler, with a minimum temperature of 4°C (40°F) and an average of 15°C (59°F), peaking at 27°C (80°F). The month sees about 55 mm (2.2 in) of precipitation over 11 days, coupled with a humidity level of 66%. In contrast, November presents a milder climate, characterized by a minimum temperature of 9°C (48°F), an average of 20°C (68°F), and a maximum reaching 30°C (86°F). Precipitation in November is lower at 39 mm (1.6 in) over 9 days, accompanied by slightly higher humidity at 72%. For more details on November weather, you can check Lang Son weather in November.
In comparing the weather of January and December, both months exhibit similar temperature ranges, with January experiencing a minimum of 4°C (40°F) and an average of 15°C (59°F), while December has identical minimum and slightly higher average temperatures at 15°C (60°F) and a max of 28°C (82°F). Precipitation is slightly higher in January, totaling 55 mm (2.2 in) over 11 days, compared to December's 51 mm (2.0 in) over 9 days. Interestingly, humidity levels are a bit higher in December at 71% compared to January's 66%. For a detailed overview of December's weather, you can visit Lang Son weather in December.
As January unfolds in Lang Son, it brings a refreshing change from the hotter months, with mild temperatures ranging from cool nights to pleasantly warm days. This transitional period sees increased rainfall, with nearly half the month experiencing precipitation, contributing to the region's lush scenery. The higher humidity levels further accentuate the crisp winter air, contrasting sharply with the dry heat of summer. For those planning a visit, January is an ideal time to experience the unique charm of Lang Son's winter weather. To learn more about the overall climate, visit Lang Son Climate.