Chiang Rai Temperature by Month

Chiang Rai in Chiang Rai Province, Thailand sees moderate seasonal temperature shifts, with daytime highs between 28°C (82°F) in December and 36°C (97°F) in April, averaging 32°C (90°F) annually. Explore the full monthly breakdown below.

In Chiang Rai, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 22°C (72°F) in April to 15°C (59°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Chiang Rai by month:

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. April, the warmest month of the year, receives 281 hours of sunshine.

The chart below shows the average temperature throughout the year:

Chiang Rai's average annual maximum temperature is 32°C (90°F). To put that in context, here's how it compares to a few well-known destinations:

Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Chiang Rai, December is the coolest month, with average highs of 28°C (82°F) and humidity around 77%, considered high. In April, the warmest month, temperatures average 36°C (97°F) with 66% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Chiang Rai's weather, including monthly rainfall, sunshine hours, and humidity, visit our Chiang Rai climate page.