Chiang Rai Temperature & Weather: All Months Guide 2025
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Chiang Rai weather is quite pleasant almost all year long with the exception of perhaps a couple of months. It is located in the very north of Thailand and is close to the country’s borders with Myanmar and Laos. Chiang Rai temperatures are quite moderate and this is due to it being surrounded by the mountain ranges on its east and west sides. Apart from this, there is also a good amount of rainfall that Chiang Rai experiences annually.

The average maximum temperature in Chiang Rai does not exceed 28 to 31 degrees Celsius making it quite the tourist destination for people from all around the world. The best months to visit Chiang Rai are from October to March. The monsoon season is between May to September and that time of year is not ideal to visit. Let’s take a look at the weather in Chiang Rai month-by-month so that you can plan your vacation better.



Chiang Rai Weather in January

January is arguably the best month to visit Chiang Rai, if you wish to sunbathe but not get sunburnt. Chiang Rai temperatures in this month are remarkably different during day and night. The rainfall is relatively low at 16 mm, in comparison to the heavy wet months.

While the chance of rain is fairly slim, we’d still recommend bringing along a raincoat or poncho or purchasing one in Chiang Rai itself. Since it’s technically still winter, carrying a sweater or two along would also be advisable. Thailand is a tropical haven and it’s only natural for the humidity levels to be high, regardless of the month or season. 

Average Minimum Temperature: 11.7 degrees Celsius
Average Maximum Temperature: 27.4 degree Celsius
Average Humidity: 73%

Chiang Rai Weather in February



The rains finally depart, making February the driest month in Chiang Rai. It’s quite sunny but not as harsh as the peak summer months. The rain levels in Chiang Rai in February are quite low at 8mm, making it ideal for those travellers who do not enjoy getting caught in the rain.

While there are still rare chances of rain, it’s nothing to worry about. Be warned that the humidity is still quite high even in this month. The evenings are slightly less humid and more enjoyable.  

Average Minimum Temperature: 12.5 degree Celsius
Average Maximum Temperature: 30.6 degree Celsius
Average Humidity: 65%

Chiang Rai Weather in March



The weather in Chiang Rai in March is heading more towards the summer temperatures. The average rainfall in Chiang Rai in March is about 24 mm which is much higher than January and February. The air in this almost-summer month is pretty humid.

So, if you’re planning to make a trip down to this part of Thailand in March, you can pack light because you will mostly need cotton dresses and shorts. You can also shop in the town as you will find traditional and comfortable Thai clothing that fit the weather. Carry a little umbrella and wear sunglasses and sunscreen as well.

Average Minimum Temperature: 15.7 degrees Celsius
Average Maximum Temperature: 33.2 degree Celsius
Average Humidity: 54%

Chiang Rai Weather in April



April in Chiang Rai brings a lot of sunshine and a bit of rain, so it gets slightly stickier but it is the last month to visit before the heavy monsoons hit. The average rainfall you can expect in Chiang Rai around this time is usually quite high at about 72 mm.

As a result, there is a chance of rain almost every day. As you can see, this is a tricky month because the weather can be slightly unpredictable. April is the warmest month in the whole year. So pack important items like umbrellas, raincoats and light cotton clothes accordingly. 

Average Minimum Temperature: 19.5 degrees Celsius
Average Maximum Temperature: 34.9 degrees Celsius
Average Humidity: 60%

Chiang Rai Weather in May



May in Chiang Rai brings the monsoon and yet somehow it’s still quite a hot season. So be prepared for some heavy showers as well the hot sun every day. The humidity in the air is quite high, so pack light clothes for a comfortable holiday.

The month of May in Chiang Rai sees about 209 mm of rain so rain jackets and a lot of pit stops while riding are going to be the norm. Also, make sure you apply sunblock and sunscreen to protect your skin from the scorching sun.

Average Minimum Temperature: 21.9 degrees Celsius
Average Maximum Temperature: 33.3 degree Celsius
Average Humidity: 72%

Chiang Rai Weather in June



June is an incredibly wet month if you’re planning to travel to Thailand. Chiang Rai temperatures in this month are quite favourable yet sometimes high. The slightly higher temperature can be attributed to the humidity in the air.

There is usually around 53.3% chance of rain during this month. So, carry an umbrella and a raincoat with you at all times. Since the terrain is hilly, the roads also become quite slippery. We suggest exercising caution while riding or driving. If it’s raining too hard, wait until it’s safe again. Other than that, enjoy the beautiful showers and scenery the gorgeous Chiang Rai has to offer.

Average Minimum Temperature: 22.8 degrees Celsius
Average Maximum Temperature: 31.6 degrees Celsius
Average Humidity: 78%

Chiang Rai Weather in July



You can expect to experience very heavy rainfall in the month of July but the lush beauty of Chiang Rai does not disappoint. The temperatures reach in this wet month is slightly cooler than the previous couple of months. The temperature at night, on the other hand, is still relatively high.

Since it’s monsoon time, the humidity is naturally quite high and there’s a very high chance of rain on a daily basis. So, if you are planning to travel to this part of Thailand in July, take all the necessary precautions. Since the rain also brings with it, different species of insects, carry the required repellants and medication.

Average Minimum Temperature: 22.7 degrees Celsius
Average Maximum Temperature: 30.8 degrees Celsius
Average Humidity: 80%

Chiang Rai Weather in August



August is officially the wettest month in Chiang Mai and it’s almost impossible to do anything or enjoy yourself during this month. So it is best to avoid coming to Chiang Rai in this month. However, if you have no other option, keep in mind that you can visit indoor places like museums, for a comparatively pleasant experience.

The average rainfall in Chiang Rai in the month of August is 434 mm making which is unbelievably high. There’s almost constant rain or overcast skies. If you are planning to travel to Thailand, especially Chiang Rai in August, be extra cautious, both weather-wise and health-wise. And if you do happen to get caught in the rain, enjoy the hot soups that are a Thai speciality.

Average Minimum Temperature: 22.4 degrees Celsius
Average Maximum Temperature: 30.4 degrees Celsius
Average Humidity: 83%

Chiang Rai Weather in September



Chiang Rai temperatures The month of September become slightly better as the rains start to retract little by little and while it’s still quite wet, it’s not too troublesome to visit. The average maximum temperature in Chiang Rai reaches quite high but the actual feel is cooler because of the monsoon season.

The average rainfall is 255 mm which is relatively lesser than the previous month but still quite heavy. If you’re planning to visit this mountain town in September, just carry a poncho or umbrella and be cautious and you’ll be in for a beautiful and adventurous trip.

Average Minimum Temperature: 30.6 degrees Celsius
Average Maximum Temperature: 21.9 degrees Celsius
Average Humidity: 83%

Chiang Rai Weather in October



In the month of October, the rainfall significantly decreases and it’s quite the ideal time to plan your trip to Chiang Rai. The average temperatures in this month make it a cool and comfortable weather to travel in. While you may have to face a lot of humidity and the average rain of 118 mm, it is easy to look past it since the views and lushness will make it worthwhile.

If you are in fact making plans to travel to Chiang Rai, we highly recommend the month of October, as it has just the right amount of everything.

Average Minimum Temperature: 20.3 degrees Celsius
Average Maximum Temperature: 30.1 degrees Celsius
Average Humidity: 82%

Chiang Rai Weather in November



While there really isn’t much of a winter season in Chiang Rai, despite the hills and greenery, November does mark the beginning of really cool months. The air gets quite cool as the winter approaches. The average rainfall is much lower at about 41 mm.

However, the humidity is still quite high during this time. November has something in store for everyone. If you’re looking for sunshine, rain or cold, this is the travel month for you. In terms of packing, carry a sweater, a raincoat as well as your sunscreen – you never know when you may need them.

Average Minimum Temperature: 17.2 degrees Celsius
Average Maximum Temperature:  28.8 degrees Celsius
Average Humidity: 79%

Chiang Rai Weather in December



Chiang Rai temperatures in December are quite low, making it the perfect month to visit. While it might be an expensive affair, it’s worth it. This is officially one of the cooler months in Chiang Rai. The humidity in December is still quite high and that’s why the impact of the cold temperatures get slightly overshadowed.

However, if you wish to see what Christmas and New Year time is like in Chiang Rai, plan your December trip and with a few adjustments, you can make it both fun and affordable.

Average Minimum Temperature: 13 degrees Celsius
Average Maximum Temperature: 26.8 degrees Celsius
Average Humidity: 77%
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