Chiang Rai · Thailand
September
Still deep monsoon — 175mm and very high humidity. September visits require weather-tolerant planning.
Avoid
#8 of 12 months
There are better months for Chiang Rai — see the full ranking below.
See when to go instead →Climate
High
30.5°C
Low
21.5°C
Rain
175mm
Sun
5hrs/day
30-year climate normals · Open Meteo ERA5
How September scores in Chiang Rai
Weather
Low
Value
Excellent
Crowds
Outstanding
Events
Below average
Atmosphere
Average
What you gain in September
- ↑Quietest month for international visitors: Chiang Rai feels entirely local
- ↑Green season landscapes are genuinely beautiful for those who can accept the rain
- ↑Best month to negotiate rates at resorts and hill tribe homestays
What you sacrifice
- ↓175mm of rain and 82% humidity: conditions are among the most physically challenging of the year
- ↓River-crossing to Laos from Chiang Saen is weather-dependent and often suspended
- ↓Cool-season guesthouses and trekking companies operating at minimal capacity — fewer options
How September compares to February (best month)
| Factor | September | February ★ |
|---|---|---|
| Weather | 2 | 10 |
| Value | 8 | 4 |
| Crowds | 9 | 3 |
September in other destinations
Lisbon (24.6°C)Barcelona (25.5°C)Tokyo (28.1°C)Bali (30.4°C)Santorini (24.1°C)Paris (21.6°C)New York (23.9°C)Marrakech (31.6°C)Amsterdam (18.8°C)Maldives (30.2°C)Rome (26.5°C)Bangkok (31°C)Istanbul (24.2°C)Vienna (22.1°C)Seoul (25.1°C)Dubrovnik (24.9°C)Rio de Janeiro (27.3°C)Kyoto (28.6°C)Phuket (31°C)Cape Town (19°C)Prague (21°C)Amalfi Coast (27°C)Mexico City (22°C)Medellín (28°C)Fiji (27°C)London (20°C)Sydney (20°C)Iceland (10°C)Tulum (32°C)Dubai (39°C)Singapore (32°C)Hoi An (31°C)Chiang Mai (31°C)Miami (32.8°C)Florence (26.3°C)Queenstown (12.5°C)Madrid (28.7°C)Porto (25°C)Edinburgh (16°C)Copenhagen (18°C)Budapest (23°C)Kraków (19°C)Tbilisi (26°C)Palawan (30°C)Hanoi (31°C)Osaka (29°C)Goa (30°C)Cusco (20°C)Buenos Aires (18°C)Mykonos (27°C)Zanzibar (27°C)Sri Lanka (30°C)Costa Rica (24°C)Cancun (31°C)Krabi (31°C)Athens (29°C)Seville (31°C)Cartagena (31°C)Siem Reap (31°C)Havana (31°C)Split (26°C)Taipei (31°C)Kuala Lumpur (32°C)Valletta (29°C)Ho Chi Minh City (32°C)Hawaii (31°C)Cappadocia (27°C)Dominican Republic (31°C)Jamaica (32°C)Tanzania (25°C)Seychelles (27°C)Nepal (26°C)Jordan (32°C)Azores (25°C)Bora Bora (27°C)Los Angeles (28.1°C)Cairo (35.9°C)Kenya (25.3°C)Jaipur (32.1°C)Las Vegas (36.2°C)San Francisco (20.8°C)Madeira (26.5°C)Vancouver (19.2°C)Muscat (38.1°C)Lima (17.8°C)Cinque Terre (25°C)Kotor (27°C)Tel Aviv (30°C)Santiago (18°C)Bogotá (18°C)Bruges (19.2°C)Penang (31.8°C)Lombok (31°C)Cape Verde (29.2°C)Fez (32.8°C)Kerala (30°C)Kigali (27°C)Hong Kong (29°C)Oslo (18°C)Auckland (16°C)Beijing (25°C)Delhi (33°C)Mumbai (30°C)Victoria Falls (31°C)Stockholm (16°C)Oaxaca (25°C)Bhutan (25°C)Da Nang (31°C)Nashville (28°C)Nice (25°C)Mallorca (28°C)Tuscany (27°C)Namibia (28°C)Crete (29°C)Komodo (32°C)Montréal (21°C)Melbourne (17°C)Cairns (28°C)Venice (24°C)Dublin (17°C)Tenerife (29°C)Ibiza (28°C)Sardinia (27°C)Sicily (29°C)Rhodes (29°C)Corfu (28°C)Zakynthos (28°C)Algarve (28°C)Naples (27°C)Antalya (32°C)Barbados (31°C)St Lucia (31°C)Aruba (33°C)Turks and Caicos (32°C)Puerto Rico (31°C)Okinawa (31°C)Hokkaido (22°C)Varanasi (33°C)Langkawi (31°C)Lake Bled (21°C)Salzburg (19°C)Lake Como (23°C)Tallinn (16°C)Iguazu Falls (26°C)Luxor (38°C)Gran Canaria (28°C)Lanzarote (28°C)Fuerteventura (28°C)Menorca (26°C)Capri (26°C)Milos (27°C)Paros (27°C)Hvar (26°C)Bodrum (29°C)Malaga (28°C)San Sebastián (22°C)Bordeaux (25°C)Corsica (26°C)Abu Dhabi (40°C)Hurghada (35°C)Essaouira (23°C)Kruger National Park (29°C)Shanghai (28°C)Chengdu (25°C)Jeju (26°C)Banff (17°C)Toronto (22°C)Québec City (18°C)Lofoten (12°C)Bergen (14°C)Gold Coast (24°C)Whitsundays (26°C)Perth (21°C)Nha Trang (31°C)Koh Phi Phi (31°C)Luang Prabang (31°C)Raja Ampat (30°C)Agra (33°C)Udaipur (31°C)Hiroshima (29°C)Naxos (27°C)Thessaloniki (28°C)Helsinki (14°C)Riga (16°C)Zurich (20°C)Monaco (25°C)Doha (39°C)Siargao (30°C)Bohol (31°C)Lake Atitlán (24°C)Sarajevo (24°C)Batumi (25°C)Chicago (24°C)Boston (23°C)Gdańsk (18°C)Berlin (18.9°C)Milan (23.2°C)New Orleans (30.7°C)Galápagos Islands (23°C)Patagonia (6.5°C)Koh Samui (30.8°C)Nusa Penida (29.8°C)Jerusalem (27°C)Busan (26°C)San Miguel de Allende (23°C)Yogyakarta (31.2°C)Hue (32°C)Nara (30.8°C)Lyon (23°C)Lalibela (22°C)Phnom Penh (31°C)Kota Kinabalu (31°C)Phu Quoc (30°C)Hakone (25°C)Kanazawa (27°C)Pai (27°C)Plovdiv (26°C)AlUla (39°C)Guanajuato (22°C)
Climate data: 30-year normals (1991–2020) from Open Meteo ERA5 reanalysis. Scores compare months within Chiang Rai, not across destinations. Methodology →