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11
April–May hottest (35–40°C feels like 45) before monsoon — outdoor walking brutal 11am–4pm. Do temples 8–10am, mall/AC lunch, street food after 5pm. Rainy season June–October floods some sois but cooler walks possible with umbrella. Burning season smog Feb–March — bad for views, OK for food. Best weather Nov–February. April = Songkran water festival — fun but packed.
3
April Songkran — hot but water fights fun. Temples morning only.
2
Carry bottle — 7-Eleven everywhere, dehydration sneaks up.