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Contents
- The climate of Chiang Rai
- The best time to visit Chiang Rai
- The worst time to visit Chiang Rai
- Spring weather in Chiang Rai
- Summer weather in Chiang Rai
- Autumn weather in Chiang Rai
- Winter weather in Chiang Rai
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average UV index
The White Temple of Wat Rong Khun with a waterfront fishpond in Chiang Rai, Thailand
Climate and monthly weather forecast
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.
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 »
Updated: Aug 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the driest month?
January is the month with the least rainfall. Rain falls for 2 days and accumulates 8mm (0.31") of precipitation.
How many days does it rain in Chiang Rai?
Throughout the year, in Chiang Rai, there are 137 rainfall days, and 1691mm (66.57") of precipitation is accumulated.
What month has the most sunshine?
With an average of 9h of sunshine, February has the most sunshine of the year.
What is the least humid month?
March is the least humid month, with an average relative humidity of 62%.
What is the month with the highest UV index?
March through September, with an average maximum UV index of 12, are months with the highest UV index.
What month is the hottest?
Chiang Rai's warmest month, April, generally records average temperatures ranging from a high of 34.8°C (94.6°F) to a low of 20.6°C (69.1°F).
When are the longest days?
The month with the longest days is June, with an average of 13h and 18min of daylight.
What are the months with the least sunshine?
The months with the least sunshine are June through August, with an average of 5h of sunshine.
What is the most humid month?
With an average relative humidity of 84%, August is the most humid month.
What is the rainiest month?
August is the month with the most rainfall. Rain falls for 24 days and accumulates 358mm (14.09") of precipitation.
What is the coldest month in Chiang Rai?
Chiang Rai experiences its lowest temperatures in December, with an average peak of 27.2°C (81°F) and a low of 13.5°C (56.3°F).
What is the month with the shortest days?
With an average of 11h and 0min of daylight, December has the shortest days of the year in Chiang Rai.
Is there Daylight Saving Time (DST)?
Chiang Rai, Thailand, does not utilize Daylight Saving Time (DST). +07 timezone is used throughout the entire year.
When is the lowest UV index?
December is the month with the lowest UV index, with an average maximum UV index of 7.
Average temperature
Chiang Rai, Thailand
The warmest month (with the highest average high temperature) is April (34.8°C).
The month with the lowest average high temperature is December (27.2°C).
The month with the highest average low temperature is June (23.6°C).
The coldest month (with the lowest average low temperature) is January (12.8°C).
Average humidity
Chiang Rai, Thailand
The month with the highest relative humidity is August (84%).
The month with the lowest relative humidity is March (62%).
Average rainfall
Chiang Rai, Thailand
- Average rainfall in January:
7.5mm - Average rainfall in February:
13.8mm - Average rainfall in March:
28.2mm - Average rainfall in April:
97.9mm - Average rainfall in May:
213.4mm - Average rainfall in June:
178.4mm
- Average rainfall in July:
310.9mm - Average rainfall in August:
358.4mm - Average rainfall in September:
283.9mm - Average rainfall in October:
124.9mm - Average rainfall in November:
59.2mm - Average rainfall in December:
14mm
The wettest month (with the highest rainfall) is August (358.4mm).
The driest month (with the least rainfall) is January (7.5mm).
Average rainfall days
Chiang Rai, Thailand
- Average rainfall days in January:
2 days - Average rainfall days in February:
1 days - Average rainfall days in March:
3 days - Average rainfall days in April:
10 days - Average rainfall days in May:
17 days - Average rainfall days in June:
19 days
- Average rainfall days in July:
22 days - Average rainfall days in August:
24 days - Average rainfall days in September:
18 days - Average rainfall days in October:
12 days - Average rainfall days in November:
6 days - Average rainfall days in December:
3 days
The month with the highest number of rainy days is August (24 days).
The month with the least rainy days is February (1 days).
Average daylight / Average sunshine
Chiang Rai, Thailand
- Average daylight in January:
11h and 1min - Average daylight in February:
11h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 1min - Average daylight in June:
13h and 2min
- Average daylight in July:
13h and 1min - Average daylight in August:
12h and 5min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 1min - Average daylight in December:
11h and 0min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
The month with the most sunshine is February (Average sunshine: 9h).
The months with the least sunshine are June, July and August (Average sunshine: 5h).
Average UV index
Chiang Rai, Thailand
The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).
