Cambodia · Climate data from Deutscher Wetterdienst (DWD)
Siem Reap dresses for a 25°C–35°C / 77°F–95°F window across the months we cover. Siem Reap runs Khmer heritage-temple-tourism — the heritage 9th-15th century Angkorian capital region (the heritage Angkor Wat 1113 UNESCO 1992 — the recognized largest religious monument in the world by area, 162.6 hectares), the heritage Angkor Thom + Bayon + Ta Prohm + Banteay Srei temple cluster. Per Deutscher Wetterdienst data, May-August holds 32-35°C / 90-95°F afternoons with overnight lows 25°C / 77°F and 17-18 monsoon rain days monthly (the heritage Cambodia-monsoon afternoon-thunderstorm pattern hits 14:00-17:00 daily May-October). Humidity 75-85%. Local register: AHA Fair Trade Village (the heritage Krousar Thmey-supported Cambodian-craft cooperative on Sivutha Boulevard), Artisans Angkor (the heritage 1992-founded Khmer-traditional-craft revival workshop and gallery cluster — silk weaving, stone-and-wood carving, lacquer, gilding), Angkor Silk Farm (the heritage Pucy Tuck silk-village 16 km west — the recognized golden-Khmer silk register), Sirivan Couture (the heritage Cambodian designer Sirivan Chak — Khmer-couture revival on Sivutha Boulevard). Heritage anchors: Angkor Wat (1113 — the heritage Suryavarman II Khmer-Empire-anchor temple, the recognized 'sunrise lily-pond reflection' photographic register), Angkor Thom (the heritage Jayavarman VII 1181 walled-city with the heritage Bayon 216-face-towers temple), Ta Prohm (the heritage Tomb-Raider 1999 jungle-tree-and-stone temple), Banteay Srei (the heritage 967 'Citadel of Women' rose-pink-sandstone miniature), the heritage Tonlé Sap floating-villages (Kampong Phluk + Chong Kneas, 30 km southeast — the heritage Cambodia largest freshwater lake). Festivals: Khmer New Year (Choul Chnam Thmey, mid-April), Vesak Bonn Pisak (May Buddhist holiday), Pchum Ben (mid-September ancestor festival). Skip shorts above-the-knee or sleeveless tops at Angkor Wat — the heritage APSARA dress code enforced absolutely (knee-and-shoulder cover required for monks-and-temple zones).
Across the 4 months we cover: morning lows from 25°C / 77°F (May) to afternoon highs of 35°C / 95°F (May).
What to wear in Siem Reap in May 2026: DWD data (35°C / 95°F afternoons, 25°C / 77°F nights, 17 rain days), Cambodia-monsoon opens at Angkor Wat.
What to wear in Siem Reap in June 2026: DWD data (34°C / 93°F afternoons, 25°C / 77°F nights, 18 rain days), peak Cambodia-monsoon at Angkor.
What to wear in Siem Reap in July 2026: DWD data (33°C / 91°F afternoons, 25°C / 77°F nights, 18 rain days), peak Cambodia-monsoon at Angkor.
What to wear in Siem Reap in August 2026: DWD data (32°C / 90°F afternoons, 25°C / 77°F nights, 18 rain days), peak Cambodia-monsoon at Angkor.
The neighborhood you sleep in affects what reads as appropriate more than the calendar does. Siem Reap's style scene anchors on the districts below — each leaf page calls out the local register (smart-casual, undone, technical, party) so the capsule maps to the streets you'll actually walk on.
Every leaf page on this hub is built from four data layers: climate normals from Deutscher Wetterdienst (DWD); named-authority etiquette and style references (Vogue, Condé Nast Traveler, Business of Fashion, the relevant local press); resident write-ups and traveler-forum reports for the failure modes tourists get wrong; and the editorial avatar pool that visualises each capsule on a person rather than a moodboard. Every DO names a reason. Every DON'T names a failure mode. We retest before each seasonal refresh — the editorial-modified date at the bottom of each leaf is the receipt.
Climate numbers come from Deutscher Wetterdienst (DWD) — the national meteorological service for Cambodia. Daily highs and lows, rain days, and daylight hours are 1991-2020 normals (the international standard, refreshed every decade). Capsule pieces and what-to-avoid notes are stress-tested against Siem Reap resident write-ups, named-stylist sources where the city has a documented uniform (Vogue Paris under Emmanuelle Alt for Paris, Vogue Japan and i-D Tokyo coverage for Tokyo, NYMag's The Cut for New York), and the failure modes locals actually flag in city forums and traveler reports.
Because the morning-low to afternoon-high swing inside one Siem Reap month already changes the silhouette — and the swing between months is much bigger than that. May mornings start at 25°C / 77°F; May afternoons hit 35°C / 95°F. A single packing list that tries to span both ends up wrong at both. Each month here is a different capsule, calibrated to the climate band that actually shows up on the ground.
4 so far: May, June, July, August. We ship climate-and-event-distinct months only — adjacent months that share more than 60% of the same capsule pieces don't get separate pages, because near-identical leaves erode the credibility of every other page on the site. The full coverage plan is in our internal CLAUDE.md (the editorial brief governs every page that ships).
Deutscher Wetterdienst (DWD) 1991-2020 normals are the version cited on every leaf — the international meteorological standard, updated by every national service every decade. We restate the numbers as raw averages on the leaf pages ("35°C / 95°F afternoons") rather than the year range, so the figures don't read as stale. The next normals refresh covers 2001-2030 and lands in 2031 — we'll bump every page when it does.
Editorial rule, enforced in CI: every DO line names a specific reason ("merino sinks under a trench so a damp morning doesn't show through your knit"); every DON'T names a specific failure mode ("suede stains the first time light drizzle catches it"). We ban "timeless," "elevate your style," "must-have," and "effortless" — they're the giveaway phrases of generic AI fashion writing. If a sentence could open any city's guide, it gets cut. Siem Reap's guide reads like Siem Reap, not like a packing-list aggregator.