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August in Lhasa is comfortable - neither hot nor cold at about 3,650m - and the trade-off is the sky. July and August carry roughly half of Tibet's annual rainfall and there are fewer blue days because of it, though regulars make the point that it mostly falls overnight around Lhasa, Shigatse and Chamdo, and eases through the second half of August. They also rate the plateau at its most beautiful now. The other reasons to come in August are the Shoton and Wangguo festivals; the cost is that this is peak season, crowded and expensive. Sun is fierce at this altitude whatever the cloud - sunscreen is the standing advice. The record: 19.4C days, 10.8C nights, 23.7 precipitation days carrying 155.6mm, 10.2 hours of sun and AQI 43.

Lhasa-forum threads on a February visit describe this as genuinely a real window before Tibet's annual closure, posters naming late February through late March as when the region typically shuts to foreign travelers for the Lunar New Year period. Regulars call early February specifically still open, several posters naming this the reason to time a trip carefully around the closure dates. Posters call daytime highs genuinely mild for the season despite cold nights, several regulars naming a range roughly around seven degrees by day with lows dropping toward negative ten. Regulars call winter genuinely low season here, several threads naming few tourists and a more authentic experience as real advantages of visiting now. Posters recommend confirming current closure dates before booking a February trip, several regulars calling this standard given how much the window can shift year to year. The record: 4.2C days, -8.5C nights, 18.9mm across nearly 5 days and 40 percent humidity.

Lhasa-forum threads on packing for early September describe conditions as genuinely warm enough during the day, posters citing typical readings between roughly eight and twenty degrees Celsius across the wider region this month. Regulars call UV exposure a real concern despite the mild air temperature, long sleeves and trousers recommended regardless of how comfortable the heat feels. Posters recommend scarves, gloves and a hat for the evening chill, temperature swings here considered genuinely significant between day and night. Regulars call September one of the stronger overall windows for Tibet, several posters listing it alongside late April, May, June and October as the recommended stretch. Posters recommend booking through an established local operator regardless of exact dates, a guide required every day in Tibet under current travel rules. The record: 17.8C days feeling like 18C, 8.4C nights, an extraordinarily high 135.5mm across 22 days and 68 percent humidity.

Lhasa-forum threads on Tibet in January describe daytime readings as genuinely milder than the numbers suggest, posters calling the strong high-altitude sun capable of making a cold day feel considerably warmer in direct light. Regulars call warmer layers essential for the nighttime drop, temperatures falling well below freezing after dark. Posters describe December and January as the coldest stretch of the year, though real sunshine remains a near-daily feature despite the season. Regulars call January genuinely rewarding for culture, most Tibetan travel happening in winter with monasteries and streets considerably more active with pilgrim activity than the tourist season. Posters recommend three to five days as plenty for a real feel of the city, fewer crowds meaning no wait at sites like the Potala Palace. Regulars recommend real cold-weather layers regardless of how sunny it looks. The record: 2.2C days feeling like -2C, -10.9C nights, 12.5mm across 5 days and 40 percent humidity.

Lhasa-forum threads on Tibet's climate describe March as capable of genuinely warm, sunny days despite the calendar reading winter, though posters call real spring not properly underway until April arrives. Regulars describe the valley floor around Lhasa as staying largely clear of real accumulation even through winter, elevation doing more to explain the thin air than heavy snow cover. Posters recommend real acclimatization time, at least a few days at Lhasa's altitude before attempting anywhere higher, regardless of how comfortable daytime feels. Regulars call nights genuinely cold this time of year, a real contrast to a sunny midday that can feel deceptively mild. Posters recommend April through early November as the broader favorable window, March still workable for thinner crowds over ideal warmth. Regulars call the Potala Palace worth visiting regardless of month. The record: 7.2C days feeling like 5C, -5.9C nights, a low 46 percent humidity and 11 hours of sun.