Last updated: April 14, 2025
Laos experiences a diverse climate, characterized by a significant range of temperatures and precipitation patterns that vary across the country. In December, temperatures can drop to a chilly 0°C (32°F) in Houaphan, while the mercury can soar to a scorching 42°C (107°F) in April at Vientiane Prefecture. The rainy season, peaking in July, brings substantial rainfall, with Bolikhamsai receiving up to 531 mm (20.9 in), while drier months like January see as little as 2 mm (0.1 in) of precipitation in Attapu. Humidity levels fluctuate dramatically as well, with average lows of 39% in April in Louangphabang rising to a humid 93% in August in Bolikhamsai, creating a dynamic and varied climatic experience throughout the year.
Laos exhibits a diverse range of Köppen-Geiger climate classes, reflecting its unique geography and topography. The southern regions, such as Attapu and Salavan, enjoy a tropical monsoon climate (Am), while areas like Champasak and Savannahkhét experience a mix of tropical savanna (Aw) and tropical monsoon (Am) climates. In contrast, the northern regions, including Houaphan, Louangphabang, and Phôngsali, predominantly fall under a humid subtropical climate (Cwa), characterized by distinct wet and dry seasons. Central locations, like Vientiane and Khammouan, present a combination of tropical savanna (Aw) and humid subtropical (Cwa) climates, creating a fascinating mosaic of weather patterns across the country. Discover more about each region's climate through the provided links to immerse yourself in the natural beauty of Laos.
| Climate Zone | Description |
|---|---|
| Am | Tropical monsoon climate with heavy rainfall and high temperatures. |
| Aw | Tropical savanna climate with a dry season occurring in winter. |
| Cwa | Monsoon-influenced humid subtropical climate with dry winters and hot summers. |
Laos experiences a notable temperature variation throughout the months, reflecting its diverse geography. January starts the year with chilly temperatures as low as 3°C (37°F) in Xiangkhoang, while Champasak basks in warmth, peaking at 36°C (98°F). As February rolls in, the mercury rises slightly, with minimums of 4°C (40°F) in Houaphan and maximums reaching 39°C (102°F) in Attapu. The trend continues in March and April, where the highs reach upwards of 40°C (104°F) to 42°C (107°F) in various regions, showcasing the approach of the hot season. By May, nights become milder but daytime temperatures cling to 41°C (107°F) in Vientiane. The onset of the rainy season in June brings less intense heat, with maximums dropping to 39°C (102°F). Temperatures stabilize during July and August, maintaining a comfortable range between 18°C (64°F) and 39°C (103°F) across several locations. As the year winds down into September, October, and November, Laos sees a return to cooler nights, with lows near 10°C (50°F) in Xiangkhoang while still enjoying pleasant days at 37°C (99°F). Finally, December brings a crisp air with temperatures dipping to as low as 0°C (32°F) in Houaphan, creating a beautiful seasonal contrast. Overall, the climate showcases a vivid tapestry, transitioning from warm to cool, beautifully highlighting Laos's natural allure.
Laos experiences a wide range of precipitation patterns throughout the year, showcasing both extremes and variability. January often sees minimal rainfall, with only 2 mm (0.1 in) recorded in Attapu, creating a dry spell at the start of the year. In striking contrast, July brings significant deluges, particularly in Bolikhamsai, where the area can receive an astonishing 531 mm (20.9 in) of rain. This pattern extends into August, which can witness up to 30 days of precipitation in Bolikhamsai, marking the peak of the wet season. Meanwhile, February is notably dry in Salavan, recording zero precipitation days, highlighting the stark seasonal fluctuations that characterize Laos's climate. Such trends underscore the country’s rich biodiversity, which is closely tied to these dynamic weather patterns.
Laos experiences notable fluctuations in humidity throughout the year, with April in Louangphabang showcasing a comfortable minimum of 39%, making it a pleasant time for outdoor activities. Conversely, the peak humidity occurs in August in Bolikhamsai, reaching a staggering 93%, which can create a sweltering and challenging environment. This dramatic contrast illustrates the tropical climate's complexity, where the dry season offers a reprieve from the oppressive moisture of the rainy season, encouraging travelers to plan their visits for maximum comfort.
Laos experiences significant variations in its UV Index throughout the year, with notable peaks in Bokeo and Xékong. In July, the average daily maximum UVI reaches an impressive 14 in Bokeo, highlighting the intense sun exposure during the monsoon season. Contrastingly, April sees an even higher average daily maximum UVI of 15 in Xékong, emphasizing the heightened UV radiation as the dry season approaches its peak. These trends indicate that both regions experience critical UV levels at different times of the year, urging residents and visitors alike to take necessary precautions to protect themselves from harmful sun exposure.
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Laos experiences considerable variation in sunshine duration throughout the year, with notable spikes in certain regions. For instance, January sees 200 hours of sunshine in Houaphan and an impressive 253 hours in Xékong, reflecting the diverse climatic conditions across the country. As the seasons transition to March, this trend of increasing sunshine continues, with 304 hours recorded in Xiangkhoang and an even brighter 327 hours in Bokeo. This upward shift not only highlights the growing warmth of spring but also presents an inviting atmosphere for outdoor activities and exploration, making March an ideal time to enjoy the natural beauty of Laos.
The likelihood of sunny weather in Laos varies significantly across seasons and regions, illustrating the diverse climatological landscape of the country. For instance, visitors to Champasak in August can only expect a mere 9% chance of sunshine, indicating the peak of the rainy season. In stark contrast, Vientiane Prefecture basks in sunlight during February, boasting an impressive 87% probability of clear skies. This contrast highlights the seasonal changes in weather patterns, making winter a prime time for travelers seeking sun-soaked adventures in Laos.
In Laos, daylight hours reveal an intriguing seasonal shift, particularly in the northern province of Phôngsali. During December, the region experiences about 10 hours of sunlight each day, showcasing the shorter days typical of winter. As the year progresses into June, daylight extends significantly to around 13 hours, reflecting the longer, sun-drenched days of the rainy season. This variation not only influences local agricultural practices but also enriches the experience of visitors, as they can enjoy more time exploring the lush landscapes and vibrant culture under the warm sun.
Experience the unique climate of Attapu, Laos, where temperature ranges from a cool 11°C (52°F) in January to a sizzling 41°C (105°F) in April and May. The region sees a flow of rain, particularly during the monsoon months of July and August, which record over 400 mm of precipitation, while the humidity often reaches a sultry 93%. The dry season, stretching from November to February, offers a pleasant respite with cooler temperatures and lower humidity, making it an ideal time for exploration. Whether you're enjoying the vibrant greenery that flourishes in the rain or basking in the warm sun during winter, the climate of Attapu is as diverse as its landscapes. For more detailed information, visit Attapu climate.
Nestled in northern Laos, Bokeo experiences a diverse climate characterized by hot temperatures and significant rainfall, especially during the monsoon season. From the cool, crisp mornings of January, where temperatures dip to 9°C (48°F), to the scorching heights of May, boasting maximums around 41°C (106°F), the region undergoes a dramatic seasonal shift. As June to August rolls in, humidity levels soar, often reaching 92%, while the region receives the bulk of its annual rainfall, peaking in August with a staggering 373 mm (14.7 in). For those intrigued by Bokeo’s climate, the variations in temperature and precipitation create a unique backdrop for adventure. Discover more about this captivating climate at Bokeo climate.
Nestled in the heart of Laos, Bolikhamsai boasts a climate that varies dramatically throughout the year. From the pleasantly mild temperatures in January, which range from a cool 5°C (41°F) to a warm 33°C (92°F), to the sweltering heat of March and April, where the mercury can soar to 39°C (102°F), this region offers a diverse weather experience. The monsoon season kicks in from May to July, bringing heavy rainfall and humidity levels that often reach 92%, while the drier months of November and December provide a refreshing respite with cooler temperatures. Overall, Bolikhamsai’s climate is a vibrant blend of heat and humidity, perfect for those who enjoy a rich tropical environment. For more specifics on the yearly weather patterns, check out the detailed Bolikhamsai climate.
The climate in Champasak, Laos offers a fascinating blend of warm temperatures and seasonal rainfall, shaping a unique tropical experience. From the crisp January lows of 8°C (47°F) to the peak summer heat that can soar up to 40°C (104°F) in April, the region’s weather is diverse. The rainy season, particularly from June to August, sees substantial precipitation, peaking in July with 446 mm (17.5 in), making it the wettest month. Humidity is notably high during these months, often exceeding 90%, while the drier months like February and December bring lower humidity levels, creating a more comfortable ambiance for visitors. To explore more about what to expect throughout the year, check out Champasak climate.
Nestled in the picturesque region of Laos, Houaphan experiences a diverse climate that transforms with the seasons. Winter months like January can see temperatures drop to a chilly 3°C (37°F), while the sizzling summer from May to August brings maximums reaching up to 36°C (98°F) alongside high humidity levels that can soar above 90%. Rainfall is most abundant during the heart of summer, particularly in August, when an impressive 355 mm (14.0 in) pours down. This variation in weather not only shapes the natural beauty of Houaphan but also offers a unique experience for visitors year-round. For a more in-depth look at the annual climate patterns, check out Houaphan climate.
In Khammouan, Laos, the climate is characterized by a striking blend of warm temperatures and seasonal rainfall. January welcomes cooler days, with temperatures ranging from a brisk 7°C to a sunny 34°C, while July and August bring heavy monsoon rains, with precipitation exceeding 500 mm and humidity levels soaring above 90%. As the year unfolds, March and April heat up, peaking at a sweltering 40°C, but relief arrives in the form of tropical showers starting in May. If you're looking to explore the lush landscape and vibrant culture amidst varying climates, discover more about the region's diverse weather patterns in our guide on Khammouan climate.
Louangphabang, Laos, experiences a rich tapestry of climate throughout the year, with temperatures ranging from a brisk 7°C (44°F) in January to a scorching 39°C (102°F) in May. The cooler dry season from November to February features lower humidity, making it an ideal time for exploration, while the wet season from June to September brings intense rainfall, peaking in August with 337 mm of precipitation. Visitors should prepare for a mix of warm days and humid nights, especially during the summer months. For a detailed overview, explore the Louangphabang climate.
Nestled in the heart of Laos, Loungnamtha experiences a diverse climate that transforms throughout the year. Winters are mild, with temperatures ranging from a crisp 6°C (43°F) to a comfortable 32°C (89°F), while the summer months can soar to a sweltering 40°C (104°F). Rainfall peaks during the monsoon season from July to August, delivering heavy downpours that keep the lush landscape vibrant and green. Humidity levels rise significantly during these months, often reaching 92%, contributing to a tropical atmosphere. For a deeper dive into the yearly weather patterns, check out the Loungnamtha climate.
Oudômxai, Laos, experiences a diverse climate characterized by mild winters and hot, humid summers. January kicks off the year with cooler temperatures averaging around 17°C (63°F), gradually warming to sizzling highs of 38°C (101°F) in May. Rainfall peaks during the summer months, especially in August, where it sees nearly 376 mm (14.8 in), while humidity levels soar to 92%. This tropical climate provides an array of experiences, from refreshing breezes in cooler months to lush, vibrant landscapes nourished by monsoon rains. For more detailed information, explore the Oudômxai climate.
Nestled in the northern region of Laos, Phôngsali experiences a diverse climate that varies significantly throughout the year. Temperatures range from a cool 5°C (42°F) in January to a sweltering high of 40°C (104°F) in May, with mild evenings year-round. With the onset of the rainy season from June to August, humidity soars, often reaching up to 92% as heavy rains pour down, peaking in July with 355 mm of precipitation. As the year draws to a close, the weather becomes cooler and drier, making it an ideal time to explore the breathtaking landscapes. For a detailed look at the annual weather patterns, visit Phôngsali climate.
Nestled in the lush landscape of Laos, Salavan experiences a tropical climate marked by distinct seasonal shifts. January welcomes cooler temperatures, with daytime highs averaging around 23°C (74°F) and lows dipping to 10°C (50°F), while the dry season gradually gives way to a wetter atmosphere. As spring unfolds, temperatures climb, peaking in the warmer months of March and April, where highs can reach 39°C (102°F). The onset of the monsoon in June brings an abundance of rain, peaking in July with an impressive 387 mm (15.3 inches), accompanied by high humidity levels often exceeding 90%. For a deeper dive into the weather patterns of this captivating region, check out the detailed Salavan climate.
Savannahkhét, Laos, features a tropical climate characterized by hot temperatures and a distinct wet season. From January to March, the weather is pleasantly warm, with daytime averages rising from 23°C (73°F) to 27°C (81°F), while humidity levels remain relatively low. However, the arrival of the monsoon in May brings a dramatic increase in rainfall, peaking in July with a staggering 404 mm (15.9 in), leading to high humidity around 90%. This combination of heat and moisture persists until October, making for a lush landscape and vibrant ecosystems. Explore more about this dynamic climate at Savannahkhét climate.
Vientiane, the capital of Laos, welcomes a tropical climate characterized by warm temperatures and a pronounced wet season. From January to March, enjoy mild conditions with averages hovering around 20-25°C (68-77°F), before the heat intensifies as April and May bring soaring highs up to 41°C (105°F). The monsoon months of June through August see significant rainfall, peaking in July and August with over 500 mm (20 in), while humidity spikes to a sweltering 91%. As the year progresses into the cooler months of October and December, temperatures drop to a pleasant 2-21°C (36-69°F), offering a delightful respite from the humidity and heat, making Vientiane's climate a unique blend of extremes. For more details, explore Vientiane climate.
Vientiane Prefecture, Laos experiences a tropical climate characterized by distinct wet and dry seasons. Temperatures soar from a mild January average of 24°C (75°F) to sweltering peaks of 42°C (107°F) in April, while humidity levels rise significantly from 52% in January to a muggy 87% by August, coinciding with the heavy monsoon rains. Notably, May to September sees the bulk of precipitation, with August receiving a staggering 402 mm (15.8 in), making it the wettest month. Conversely, the year wraps up with a return to cooler and drier conditions, as December ushers in lower temperatures and minimal rainfall. Discover more about the region’s climate at Vientiane Prefecture climate.
In Xiagnabouli, Laos, the climate showcases a striking contrast between the dry and wet seasons. January and February offer mild temperatures, with averages around 22-23°C (71-73°F) and low humidity, making it an ideal time for outdoor exploration. As the days heat up in April and May, temperatures can soar to 41°C (107°F), accompanied by increasing humidity and downpours, particularly in June and July when rainfall peaks. The monsoon season transforms the landscape, with lush greenery emerging from the abundant precipitation. For a more detailed look at what to expect throughout the year, visit the Xiagnabouli climate.
Nestled in the heart of Laos, Xiangkhoang experiences a diverse climate that enchants visitors year-round. January kicks off with cool mornings, where temperatures can dip to a brisk 3°C (37°F), but afternoons warm up nicely to around 28°C (84°F). As the months progress, the heat swells, peaking in June and July with temperatures nearing 36°C (96°F) amid the monsoon rains, which can exceed 400 mm (16 in) of precipitation in July alone. Humidity reaches its peak during these rainy months, often hovering around 92%, creating a lush, verdant landscape. To explore this captivating climate in more depth, visit Xiangkhoang climate.
Xékong, Laos, experiences a tropical climate characterized by warm temperatures and pronounced rainfall. January begins the year with cooler nights at about 6°C (42°F), while daytime highs can reach up to 35°C (95°F). As spring arrives, March and April signal a rise in temperatures, peaking around 39°C (102°F), but this warmth is soon mixed with the onset of the rainy season in May, where precipitation swells to an impressive 227 mm (8.9 in). With humidity levels soaring, particularly during the summer months of July and August, the lush landscapes thrive, making Xékong a vibrant destination year-round. To explore more on the weather all year round, visit Xékong climate.
Laos experiences a diverse climate, marked by a wide temperature range and significant variations in precipitation and humidity throughout the year. In the cooler months, temperatures can dip as low as 0°C (32°F) in December in Houaphan, providing respite from the tropical heat, while peak summer temperatures can soar to an extreme 42°C (107°F) in Vientiane Prefecture during April. As the rainy season arrives, especially in July, Bolikhamsai sees staggering rainfall, reaching up to 531 mm (20.9 in), contrasting sharply with the dry months where Attapu might only see 2 mm (0.1 in) in January. Humidity levels also shift dramatically, with a stark increase from around 39% in April in Louangphabang to a sweltering 93% in August in Bolikhamsai. These trends illustrate how Laos's climate is characterized by a pronounced wet and dry season, making it an area of captivating contrasts that shape the experience of both its residents and visitors alike.