Weather in Lào in Tháng 9
Country-wide climate normals across 15 cities in Lào.
How Hot Is Lào in Tháng 9?
Lào sees consistently hot September weather — average highs of 29°C, average lows of 22°C, with minimal regional differences. Whether you're in Vientiane or one of the coastal cities, conditions feel broadly the same: hot, generally clear, with little night-time relief.
Sunshine in Lào in Tháng 9
Limited sunshine and short daylight define Lào's September: Vientiane averages just 1.0h of direct sun, with the sun up between 5:55 am and 6:10 pm. The grey, overcast pattern is consistent across most of the country, with little regional variation in cloud cover.
Does It Rain In Lào In Tháng 9?
Heavy seasonal rains saturate Lào in September — Vientiane averages 330mm of rain across 24 days, with downpours an almost daily feature. The pattern is consistent across most regions, particularly along monsoon-affected coasts. Expect torrential afternoon storms followed by humid heat.
Is Lào Humid In Tháng 9?
Lào is enveloped in tropical-thick humidity through September: Vientiane averages 84%, and most of the country tracks similarly. The constant moisture makes warm temperatures feel substantially hotter, and even nights bring limited cooling. Light cotton clothing is essential.
Wind In Lào In Tháng 9
Winds are light across Lào in September — averaging 8 kph in Vientiane, with mostly still air across the country. Outdoor activity is comfortable; sailing and similar wind-dependent sports may struggle. The pattern is consistent in most regions.
Cloud Cover In Lào In Tháng 9
Lào's September is dominated by overcast skies: Vientiane averages 78% cloud cover, with similar grey persistence across the country. Days feel dim and soft-lit, with little break in the cloud deck.