Climate and monthly weather forecastChiang Rai, Thailand

The climate of Chiang Rai

Marked by its geographical position in Northern Thailand, the climate in Chiang Rai resonates with the Koppen climate classification of Aw, also referred to as Tropical Wet and Dry or Savanna. The city experiences altering spells of wet and dry spells with a high temperature difference across the year. Monthly average day temperatures range from 27.2°C (81°F) in December to a peak of 34.8°C (94.6°F) in April.

Sharp fluctuations in precipitation levels can be observed over the course of the year. Substantial rainfall initiates in April, peaks during August with 358mm (14.09") and finally ends around November. The annual dry period begins from December and extends until March, with significantly lower rainfall ranging from 8mm (0.31") to 28mm (1.1"). These rainfall patterns hence divide the year into clear wet and dry seasons.

In correlation with the rainfall, daylight hours demonstrate a variance from 10.9 hours in December to an annual high of 13.3 hours in June. Coupled with these alterations are changes in sunshine hours; minimum of 5 hours in the rainy months from June to August and maximum of up to 9 hours in February. Relative humidity levels also fluctuate, with the driest month being March with an average of 62% and the highest humidity of 84% during August.

The best time to visit Chiang Rai

With regard to preferred weather conditions for visitor comfort, the best time to visit Chiang Rai may be from November to February. During these months, the city experiences a drier climate with an average rainfall between 14mm (0.55") and 59mm (2.32"). Coupled with moderate temperatures that vary from a high of 27.2°C (81°F) to 30.5°C (86.9°F) and low of 13.5°C (56.3°F) to 21.1°C (70°F), these conditions are ideal for outdoor activities and exploration. With 7 hours of sunshine each day, visitors may fully experience the attractions and natural beauty this region offers.

The worst time to visit Chiang Rai

June to August proves to be the least desirable period to visit Chiang Rai owing to the high humidity levels, ranging from 80% to 84%, and increased rainfall, with an average monthly precipitation of 284mm (11.18") to 358mm (14.09"). Moreover, temperatures during these months can rise up to 32.1°C (89.8°F). Clearly, the high likelihood of rainfall combined with the heated environment may deter outdoor activities and sightseeing expeditions.

Spring weather in Chiang Rai

Spring in Chiang Rai, which spans from March to May, is marked by a significant increase in temperatures. It starts with a high of 33.8°C (92.8°F) in March, further escalating to 34.8°C (94.6°F) in April, and slightly drops to 33.1°C (91.6°F) in May. Nights during this period are warmer compared to the year's start, with lows fluctuating between 16.9°C (62.4°F) and 22.5°C (72.5°F). Notably, precipitation begins to increase substantially in May, reaching up to 213mm (8.39").

Summer weather in Chiang Rai

The months June through August constitute the tropical summer season in Chiang Rai. This period is characterized by high levels of precipitation, with an average range from 178mm (7.01") in June to the highest level of 358mm (14.09") in August. Despite high rainfall, temperatures maintain a steady high from 32.1°C (89.8°F) to 31.1°C (88°F) during these months. Minimum temperatures also persist in the high twenties, with an average between 23.6°C (74.5°F) and 23.4°C (74.1°F).

Autumn weather in Chiang Rai

September to November form the autumn season in Chiang Rai. Although still experiencing rainfall, amounts tend to decrease over these months, falling from 284mm (11.18") in September to 59mm (2.32") by November. Similarly, temperatures start to diminish beginning with an average of 31.1°C (88°F) in September and dropping to 28.8°C (83.8°F) in November. Humidity levels also lessen during this period, ranging from 82% to 79%.

Winter weather in Chiang Rai

The winter months, December through February, are relatively dry accompanied by cooler temperatures. High temperatures decline from 28.8°C (83.8°F) in November to 27.2°C (81°F) in December and gradually increase again to 31.3°C (88.3°F) in February. Night-time temperatures, conversely, are the lowest of the year during this period, ranging from 13.5°C (56.3°F) to 13.7°C (56.7°F). Additionally, the region experiences the least rainfall with an average of 8mm (0.31") in December to 14mm (0.55") in February. Winter provides sunny conditions in contrast to the rest of year, with daily sunshine hours peeking at 9 hours in February.

Weather in January

The new year in Chiang Rai, Thailand, offers an enjoyable ambience in January, where residents and tourists get to experience mellow weather. The temperatures reveal a mild climate, transitioning from 12.8°C (55°F) up to 28.6°C (83.5°F). Weather in January »

Weather in February

As January fades, February welcomes an increase in temperatures, making the city slightly warmer. This month demonstrates a decrease in relative humidity to 67%, making the atmosphere dry and pleasant. There's a pronounced presence of sunshine, contributing to the overall delightful climate. Weather in February »

Weather in March

Witness the peak of the warm season in Chiang Rai in the month of March as the temperatures soar. This is the time when outdoor enthusiasts appreciate the warmth of 16.9°C (62.4°F) to 33.8°C (92.8°F). The city bathes in extended hours of daylight, enriching the vibrancy of the locale. Weather in March »

Weather in April

April brings an even hotter environment to Chiang Rai, with a considerable increase in rainfall compared to the previous months. The precipitation rate noted is significant at 98mm (3.86"). With an increased UV index, sun protection becomes a priority for anyone spending ample time outdoors. Weather in April »

Weather in May

The charm of Chiang Rai in May lies in its mixed-interlude of sunshine and rainfall. The city experiences its hottest month, welcoming frequent downpours, marking a transition into the rainy season. These intermittent showers are a refreshing contrast to the high humidity levels. Weather in May »

Weather in June

June in Chiang Rai brings a retreat from the sweltering heat of May, as the city enters the monsoon period. The scale of rainfall goes up to 178mm (7.01"), adding to the city’s verdant appeal. As compared to previous months, sunshine hours lessen, adding a cool temper to the month. Weather in June »

Weather in July

July in Chiang Rai is known for its highest rainfall, measuring at 311mm (12.24"), making it the wettest month of the year. As the destination is in full swing of the rainy season, there are fewer daylight hours. The persistent rainfall brings about a mystical aura, transforming the city into a moist and green paradise. Weather in July »

Weather in August

In August, Chiang Rai experiences generous showers, continuing the monsoon trend of last month. Though the rainfall decreases slightly to 358mm (14.09") from the previous month, humidity is at its maxima. However, despite these continuous showers, the city maintains a vibrant and lively scenario. Weather in August »

Weather in September

Transitioning from August, September in Chiang Rai sees a decline in rainfall rates to 284mm (11.18"). The month ushers in a decrease in daylight hours, giving way to soothing and calm evenings. Equally matched by less humidity and rather mild temperatures, the pleasant weather makes outdoor pursuits enjoyable. Weather in September »

Weather in October

October marks the end of the rainy season in Chiang Rai. The significant decrease in rainfall to 125mm (4.92") indicates a shift in the weather pattern. As temperatures start to dip and days get shorter, the city prepares to welcome the approaching cool season. Weather in October »

Weather in November

November in Chiang Rai sees greatest decrease in rainfall, down to 59mm (2.32"). A marked reduction in humidity accompanies this diminished rainfall. The city experiences almost perfect weather, highlighting the pleasantness of semi-cool temperatures across day and night. Weather in November »

Weather in December

December witnesses the onset of the cool season in Chiang Rai with temperatures ranging from 13.5°C (56.3°F) and 27.2°C (81°F). The month marks a significant reduction in rainfall, to an annual low of 14mm (0.55"). The city resonates with festive spirit against the backdrop of perfect weather. Weather in December »