Last updated: August 21, 2025
September in Viengxay, Laos showcases a tropical climate marked by mild temperatures and substantial precipitation. Daily highs reach up to 31°C (88°F), while averages hover around a comfortable 23°C (74°F), dipping to lows of 16°C (60°F) at night. With 173 mm (6.8 in) of rainfall spread over 23 days, visitors can expect a wet but lush environment, where the humidity sits at a high 82%. This combination of warmth and moisture creates a vibrant landscape that embodies the beauty of Laotian nature during this month.
In September, temperatures in Viengxay, Laos showcase a gentle transition as the wet season peaks. With a minimum of 16°C (60°F) and an average of 23°C (74°F), the weather is pleasantly warm, while the maximum temperature hovers around 31°C (88°F). This month marks a slight dip from the summer highs of August, where temperatures lingered at around 32°C (91°F). As autumn approaches, the milder evenings and the consistent warmth during the day create an inviting atmosphere for both locals and travelers, making it a delightful time to explore the lush landscapes and vibrant culture that surrounds this scenic region.
September in Viengxay, Laos, marks a significant shift in the rainy season, featuring an impressive 173 mm (6.8 in) of precipitation over 23 days. As the wettest months of the year subside, this rainfall signifies a gradual tapering from the peak August total of 357 mm (14.1 in). The transition highlights a pattern where precipitation begins to decline from the heights of July and August, suggesting a slowdown in monsoonal activity. With September's rainfall contributing to the lush, vibrant landscape while also providing a respite from the intense downpours of late summer, it sets the stage for the drier October ahead. The cyclical nature of rainfall in Viengxay offers a unique glimpse into the region’s climate dynamics, emphasizing both the intensity and duration of the rainy season.
In September, Viengxay, Laos, experiences a notable drop from the peak humidity levels of the summer months, settling at 82%. This marks a transition from the relentless summer humidity, which reached highs of 91% in July and 92% in August. Despite the slightly reduced discomfort, September still retains a high humidity level, likely driven by ongoing tropical influences. As the region begins to shift towards the cooler months ahead, humidity levels gradually decrease further, paving the way for a more comfortable atmosphere in the subsequent months. Overall, the trend underscores a shift from oppressive summer conditions to a more balanced climate as autumn approaches.
In September, Viengxay, Laos experiences an ultra-high UV Index of 14, indicating an extreme exposure category that requires caution. This peak is consistent with the preceding months of July and August, where the UV levels also reached an intensity of 14 or higher, signaling the region's high risk for skin damage with a burn time limited to just 10 minutes. As the seasons transition, the UV Index starts to moderate in October, dropping to 12, yet it remains crucial for residents and visitors alike to stay vigilant. Understanding these trends is vital for effective sun safety, making it essential to check local forecasts regularly. For more detailed information, visit Viengxay UV Index.
UV Risk Categories
September in Viengxay, Laos, boasts a delightful 271 hours of sunshine, marking a peak in the late monsoon season. As the year progresses, sunlight reaches its zenith in May with 299 hours, gently tapering off in the following months. The trend reveals a gradual decline from the vibrant spring months of March and April, where daylight dances between 275 and 247 hours respectively, to the more subdued hours seen in the cooler autumn months. Despite a slight drop from August's 261 hours, September stands out with a reassuring balance of sunlit days, allowing residents and visitors alike to savor the warmth of the lingering summer before the sun's embrace begins to wane.
In September, the likelihood of sunny weather in Viengxay, Laos, drops to just 12%, reflecting a trend of diminishing sunshine as the rainy season approaches its peak. This month typically follows a summer of limited sun, where July and August offer even less light at 15% and 9%, respectively. As contrasts become apparent, the sunniest months, like January and December, showcase clear skies with chances soaring to 42% and 48%. It’s clear that if you're seeking sunshine during September, you may want to temper your expectations and prepare for more overcast days as the tropical rains take center stage.
In September, Viengxay, Laos enjoys a wholesome twelve hours of daylight, marking a transition into autumn. This duration mirrors the longer days of earlier summer months, highlighting a gradual shift as sunlight begins to wane from the peak brightness seen in May through July. As the year progresses, daylight slowly decreases, moving from 13 hours in the summer to 11 hours by October. This pattern not only reflects the changing seasons but also invites residents and visitors alike to savor the last remnants of longer days before the shorter, cozier months of the year approach. The steady rhythm of daylight hours contributes to the vibrant lifestyle and natural beauty that defines this captivating region of Laos.
As September sweeps into Viengxay, a gentle calm settles over the region, with the average wind speed dipping to 1.2 m/s (3 mph), the lowest of the year. This decline follows a summer of slightly brisker breezes, where peak speeds reached 2.0 m/s (5 mph) in June. The shifting dynamics of wind patterns throughout the year reveal a seasonal ebb and flow: starting from a consistent 1.5 m/s in the early months, the spring months bring a slight increase before the summer months show more vigor. However, as autumn approaches, the winds soften once again, hinting at the tranquility of the upcoming cooler months. This gradual transition from lively gusts to serene whispers captures the essence of September in this picturesque Laotian town.
Weather in Viengxay varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Viengxay, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present a stark contrast in weather conditions. In September, temperatures range from a mild 16°C (60°F) at night to a warm 31°C (88°F) during the day, with an average of 23°C (74°F). This month is characterized by high humidity at 82% and significant rainfall, totaling 173 mm (6.8 in) over 23 days. In contrast, January offers much cooler temperatures, with a minimum of 4°C (39°F) and an average of 15°C (59°F), peaking at 28°C (83°F). The humidity drops to 63%, and there is minimal precipitation of only 29 mm (1.1 in) over just 6 days. For a detailed look at the weather specifics, check out Viengxay weather in January.
September and February present contrasting weather profiles. September boasts a warm climate with average temperatures around 23°C (74°F) and peaks reaching 31°C (88°F), accompanied by significant rainfall of 173 mm (6.8 in) over 23 days, leading to high humidity levels at 82%. In stark contrast, February offers cooler conditions, with average temperatures of 16°C (61°F) and a minimum of 4°C (40°F). Rainfall is minimal, totaling just 30 mm (1.2 in) over 6 days, and humidity drops to 65%. These differences highlight the transition from the rainy season in September to the drier and cooler conditions typical of February. For more detailed information, visit Viengxay weather in February.
When comparing the weather in September and March, we see distinct differences in temperature and precipitation. September boasts a warmer average temperature of 23°C (74°F), with highs reaching up to 31°C (88°F), but it also brings significant rainfall, with 173 mm (6.8 in) over 23 days and a high humidity level of 82%. In contrast, March features cooler weather with an average temperature of 20°C (68°F) and maximums hitting 32°C (89°F), but it is much drier, receiving only 76 mm (3.0 in) of rain over just 13 days and a more comfortable humidity level of 57%. For those interested in more specific weather patterns, you can check out Viengxay weather in March.
In comparing the weather of September and April, notable differences emerge in temperature and humidity. September boasts a minimum temperature of 16°C (60°F) and an average of 23°C (74°F), with highs reaching up to 31°C (88°F). In contrast, April starts cooler at a minimum of 9°C (49°F) but can soar to a maximum of 35°C (95°F) while maintaining a more moderate average of 21°C (70°F). Although September experiences higher humidity at 82%, April offers a much drier climate with humidity levels around 50%. Precipitation patterns also differ, with September seeing 173 mm (6.8 in) over 23 days compared to April's 143 mm (5.6 in) across just 19 days, making September a markedly wetter month. For detailed weather insights specific to April, check Viengxay weather in April.
When comparing the weather between September and May, it's evident that both months share a similar average temperature of 23°C (74°F). However, May tends to be warmer, with maximum temperatures reaching up to 35°C (96°F), compared to September's maximum of 31°C (88°F). In terms of precipitation, May experiences slightly more rainfall at 208 mm (8.2 in) over 25 days, while September has 173 mm (6.8 in) across 23 days, indicating that May is both wetter and has an increased likelihood of rainy days. Humidity levels also differ, with September being significantly more humid at 82%, while May enjoys a relatively more comfortable 68%. For more details about the weather during this time, you can visit Viengxay weather in May.
In comparing the weather of September and June, September tends to be slightly cooler with average temperatures ranging from 16°C (60°F) to 31°C (88°F), whereas June sees higher minimum and maximum averages, with temperatures ranging from 20°C (68°F) to 35°C (96°F). Both months experience similar levels of precipitation, with September at 173 mm (6.8 in) over 23 days and June at 176 mm (6.9 in) over 22 days. Interestingly, September has a higher humidity level at 82% compared to June's 79%. For more detailed information about June weather in the region, check out Viengxay weather in June.
When comparing the weather in September and July, it’s clear that July is generally warmer, with minimum temperatures around 20°C (68°F) and an average of 24°C (76°F), peaking at 32°C (91°F). In contrast, September sees slightly cooler temperatures, starting at a minimum of 16°C (60°F), with an average of 23°C (74°F) and a maximum of 31°C (88°F). Additionally, July experiences more precipitation, totaling 290 mm (11.4 in) over 26 days, compared to September's 173 mm (6.8 in) over 23 days. Humidity levels are also higher in July at 91%, while September maintains a slightly lower humidity at 82%. For a detailed look at July weather, check out Viengxay weather in July.
In comparing the weather patterns of September and August, September tends to be slightly cooler, with average temperatures ranging from a minimum of 16°C (60°F) to a maximum of 31°C (88°F), whereas August features a warmer range with temperatures from 19°C (67°F) to 32°C (91°F). Humidity levels in September average around 82%, which is lower than August's higher humidity at 92%. Precipitation also sees a notable decrease in September, with 173 mm (6.8 in) over 23 days compared to August's 357 mm (14.1 in) over 27 days, making September drier overall. For more details, check out Viengxay weather in August.
September typically experiences warmer weather compared to October, with average temperatures reaching around 23°C (74°F) and a maximum of 31°C (88°F). In contrast, October sees a slight drop in temperatures, averaging 20°C (69°F) with the same maximum of 31°C. Both months are relatively wet, with September receiving 173 mm (6.8 in) of rain across 23 days, while October has slightly less precipitation at 165 mm (6.5 in) over 19 days. Moreover, October boasts lower humidity levels at 76%, compared to September's higher humidity of 82%. For more detailed information about the weather in October, you can visit Viengxay weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a minimum of 16°C (60°F) to a maximum of 31°C (88°F), with an average of 23°C (74°F). This month is characterized by high humidity at 82% and significant precipitation, totaling 173 mm (6.8 in) over 23 days. In contrast, November offers cooler temperatures, with a minimum of 8°C (47°F), an average of 18°C (65°F), and a maximum of 30°C (86°F). Additionally, November experiences much lower precipitation at 40 mm (1.6 in) spread over just 9 days, along with a humidity level of 72%. For more details, visit Viengxay weather in November.
In comparing the weather between September and December, there is a stark contrast in both temperature and precipitation. September features a much warmer climate, with temperatures ranging from a minimum of 16°C (60°F) to a maximum of 31°C (88°F), along with high humidity levels of 82%. In contrast, December brings cooler temperatures, with lows of 2°C (36°F) and an average of 15°C (58°F), peaking at 28°C (82°F). Additionally, December experiences significantly less precipitation, totaling only 30 mm (1.2 in) over just 7 days, compared to September's hefty 173 mm (6.8 in) spread across 23 days. For more detailed information, you can check Viengxay weather in December.
As September unfolds in Viengxay, the weather takes on a unique character, marked by a blend of warmth and humidity. With maximum temperatures reaching up to 31°C (88°F), the days are pleasantly warm, contrasting with cooler mornings and evenings. However, this month is notably wetter, as September witnesses an average of 23 rainy days, contributing to a remarkable precipitation total. The increased humidity, hovering around 82%, enhances the tropical feel, making it distinct from the drier months. For those keen to understand these patterns further, you can explore more at Viengxay Climate.