The month in detail
What to expect in September
Autumn marks the end of peak season in Chiang Rai. Temperatures drop (29°C) and rain returns (49% of days). With 49% of rainy days, always have indoor alternatives planned.
September ranks 7 out of 12 months in Chiang Rai. Compared to August: 17 pts fewer rainy days, +1.3h of sun per day.
This month's conditions
What it's like in September
UV index
7 · high
sunscreen and hat advised
Feels like
very humid
23°
Daylight
12.1h of daylight
Air quality
good
AQI 24
Compare
Is September the right month?
The best month in Chiang Rai is February (9.1/10), 4.1 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Chiang Rai
Expedia →
Activities
Tours, tickets, experiences
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Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Chiang Rai
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Thailand
🗣️LanguageThai
💶CurrencyThai Baht (฿)
🚗DrivingLeft-hand
🛡️Safety ⓘSafe · 2/5
💰Cost of living ⓘCheap · 2/5
🌡️ Climate
🌍Climate typeTropical
📈Climate trend ⓘStable
🔥Hottest monthApril · 34°C
❄️Coolest monthJanuary · 26°C
🌧️Rainiest month ⓘAugust · 66%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘSeason Nov-Apr
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Chiang Rai ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
ThailandTropical climate with a 9.1 → 4.6 gap between best and worst month. 10 years of ERA5 data to choose by project.
19.91°N · 99.83°E
Questions
Frequently asked questions
What is the best time to visit Chiang Rai?
February is the best month with 29.0°C highs, 15.0°C lows, 8.6h of sunshine and 4.0% rainy days. The months of February & January offer comparable conditions.
How many hours of sunshine does Chiang Rai get in February?
Chiang Rai averages 8.6 sunshine hours per day in February. It is the sunniest month with a climate score of 8.9/10.
What is the rainiest month in Chiang Rai?
July is the most unfavourable month with July has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Chiang Rai in February?
In February, overnight lows reach 15.0°C, while afternoon highs average 29.0°C.
Is Chiang Rai good in winter?
In winter (December-February), Chiang Rai scores 8.6/10 on average — Decent period conditions for cultural visits.. The best month overall remains February with a score of 8.9/10.
When should you avoid Chiang Rai?
July is the most difficult month to visit Chiang Rai, with July has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in Chiang Rai in September?
The average UV index reaches 7 in September in Chiang Rai (high), with about 12.1h of daylight. Sunscreen and hat advised.