Thailand Weather in May 2025: Should You Visit or Not?

Thailand Weather in May: Are you planning a trip to Thailand in May? Are you also curious about how the weather is in Thailand in May? If yes, you’re in the right place. It’s always a good idea to have some knowledge about the weather conditions of the place you want to travel in advance. This way, you can plan your trip better and pack your bags accordingly.

Here at TripFactory, we’ve shared everything you need to know about the weather conditions in Thailand in May. We also covered detailed weather overviews for major cities like Bangkok, Pattaya, Phuket, Krabi, and Chiang Mai. So, without any delay, let’s scroll down and take a look at the weather forecast for Thailand in May 2025.

Thailand Weather in May, 2025

May is the beginning of the rainy season in Thailand, with temperatures ranging from 25°C to 35°C and higher humidity. Bangkok stays between 26°C to 35°C, while Phuket and Krabi are slightly cooler between 25°C to 33°C. Brief afternoon rain showers are common, with about 7 hours of daily sunlight.

This is the perfect time and an opportunity to explore cities and beaches, as you’ll experience fewer tourists and more affordable prices than during the peak season.

Before planning your trip, check if you should apply for a visa for Thailand from India or not.

City	High / Low (°C)	Rainy Days
Bangkok	34° – 26°C	15 – 20
Pattaya	33° – 27°C	12 – 18
Chiang Mai	35° – 23°C	16 – 21
Phuket	33° – 25°C	20 – 25
Krabi	33° – 24°C	18 – 24

Thailand Weather in May – These are the predicted numbers of rainy days you might experience in May 2025 in these Thai cities, along with their high and low temperatures.

Pros and Cons of Visiting Thailand in May

Pros	Cons
Lower hotel and flight rates (off-season)	Hot and humid weather
Fewer tourists = Peaceful beaches	Sudden rain showers (carry an umbrella)
Lush greenery after the first rains	Some island ferry services may be limited
Waterfalls and rivers look more beautiful	Rough seas can affect travel plans

Weather in Bangkok in May 2025

In May, Bangkok typically experiences hot and humid weather as it marks the beginning of the rainy season. Here’s a more detailed breakdown:

Temperature:

• Average Daily Temperature: Around 30°C (86°F).
• Average High Temperature: Can reach up to 33-34°C (91-93°F).
• Average Low Temperature: Stays around 26°C (79°F).
• Evenings tend to be balmy.

Rainfall:

• May sees a significant increase in rainfall compared to the preceding months.
• Average rainfall in May is around 83 mm to 180 mm.
• There are typically between 17 to 20 days with some precipitation.
• While there might be frequent showers, they are often occasional and don’t usually last for extended periods.  

Humidity and Sunshine:

• Humidity levels are generally high, around 70% on average, which can make the heat feel more intense.  
• You can still expect a good amount of sunshine, with an average of around 8 hours per day. There’s roughly a 19% chance of a completely sunny day.

Overall:

• May in Bangkok is characterized by hot and humid conditions with the increasing likelihood of rain showers.  
• It’s the start of the off-season for tourism, so you might find fewer crowds and potentially more affordable accommodation.
• Despite the rain, you can still enjoy the city’s attractions. The rain can sometimes offer a refreshing break from the heat.

Pattaya Weather in May 2025

In May 2025, you can experience hot and humid conditions as the monsoon season begins in Pattaya. Daytime temperatures average around 32°C (90°F), and it comes around 26°C (79°F) in night. You can also enjoy an average of 6.5 hours of sunshine daily.

Temperature:

• Average Daily Temperature: Around 30°C (86°F).
• Average High Temperature: Typically reaches 32-33°C (90-91°F).
• Average Low Temperature: Stays around 28°C (82°F).
• It will feel quite warm throughout the day and night.

Rainfall:

• May sees a significant increase in rainfall compared to the drier months.
• Average rainfall can range from about 80 mm to 186 mm.
• You can expect rain on around 12 to 17 days of the month.
• The rain often comes in the form of scattered thunderstorms, which can be heavy but are usually short-lived. Sunshine often returns after the showers.

Humidity and Sunshine:

• Humidity levels will be high, often making the heat feel more intense and sticky.
• You can still expect a fair amount of sunshine, with an average of around 6 hours per day.

Overall:

• May in Pattaya is hot and humid with a high chance of rain showers.
• It’s considered part of the shoulder season, meaning there might be fewer tourists compared to the peak season (November to February). You might find better deals on accommodation.
• Despite the rain, you can still enjoy Pattaya’s attractions. Just be prepared for sudden downpours.

Phuket Weather in May 2025

​In May 2025, Phuket experiences the onset of the monsoon season. Daytime temperatures ranges around 32°C (89°F), with nighttime lows near 24°C (75°F). Rainfall is significant, contributing to high humidity levels around 80%. Sunshine is limited to approximately 6.5 hours daily.

Temperature:

• Average Daily Temperature: Around 29°C (84°F).
• Average High Temperature: Can reach up to 32-35°C (90-95°F). May is often one of the hottest months in Phuket.
• Average Low Temperature: Stays around 25-26°C (77-79°F).
• Evenings will remain warm and humid.

Rainfall:

• May marks a significant increase in rainfall compared to the earlier, drier months.
• Average rainfall in May ranges from approximately 129 mm to 281 mm.
• You can expect rain on an average of 15 to 18 days in May.
• The rain often comes in the form of tropical showers or thunderstorms, which can be heavy but are usually short-lived. You’ll likely still experience periods of sunshine.

Humidity and Sunshine:

• Humidity levels are generally high, averaging around 78-79%, which can make the heat feel more intense.
• Despite the increasing rainfall, you can still expect a decent amount of sunshine, averaging around 6 to 8 hours per day. However, the chance of a completely sunny day is lower compared to the dry season.

Sea Conditions:

• The sea temperature is typically warm and inviting, averaging around 30°C (86°F), making it suitable for swimming.
• However, as the monsoon approaches, there’s an increased chance of stronger waves and potentially reduced visibility for water activities.

Overall:

• May in Phuket is characterized by hot and humid conditions with a significant increase in the frequency and intensity of rainfall.
• It’s considered the beginning of the low season for tourism, so you might find fewer crowds and potentially better deals on accommodation.
• While you can still enjoy the beaches and other attractions, it’s essential to be prepared for rain and plan your activities accordingly.

Krabi Weather in May 2025

In Krabi during May, you can anticipate hot and humid weather as it marks the beginning of the rainy season. Here’s a more detailed overview:

Temperature:

• Average Daily Temperature: Around 28-29°C (82-84°F).
• Average High Temperature: Can reach up to 32-33°C (90-91°F).
• Average Low Temperature: Stays around 24-25°C (75-77°F).
• Evenings are typically warm and balmy.

Rainfall:

• May sees a significant increase in rainfall compared to the drier months.
• Average rainfall in May ranges from approximately 115 mm to 292 mm.
• You can expect rain on an average of 14 to 20 days in May.
• The rain often occurs as short bursts of heavy showers, typically in the late afternoon or evening. It doesn’t usually rain all day.

Humidity and Sunshine:

• Humidity levels are generally high, averaging around 82%, which can make the heat feel more intense.
• You can still expect a decent amount of sunshine, with an average of around 6 to 8 hours per day. However, there’s a higher chance of cloudy days.

Sea Conditions:

• The sea temperature is warm, averaging around 30-31°C (86-88°F), making it pleasant for swimming.
• With the onset of the rainy season, there might be occasional stronger waves, but generally, the seas are still suitable for activities like kayaking and stand-up paddleboarding.

Overall:

• May in Krabi is hot and humid with an increased likelihood of rain showers.
• It’s the start of the low season, so you can expect fewer tourists and potentially lower prices for accommodation.
• Despite the rain, you can still enjoy Krabi’s stunning landscapes, including lush greenery and less crowded beaches. Waterfalls like Huay Toh Waterfall will be in full flow.

Weather in Chiang Mai in May

In Chiang Mai during May, you should expect hot and humid weather as the region transitions into its rainy season. Here’s a more detailed breakdown:

Temperature:

• Average Daily Temperature: Around 31°C (88°F).
• Average High Temperature: Can reach very high temperatures, often around 33-37°C (91-99°F). May is typically one of the hottest months in Chiang Mai.
• Average Low Temperature: Stays relatively warm, around 24-25°C (75-77°F).
• Evenings will remain warm.

Rainfall:

• May sees a significant increase in rainfall compared to the dry season.
• Average rainfall in May ranges from approximately 69 mm to 165 mm.
• You can expect rain on an average of 16-17 days in May.
• The rain often comes in the form of afternoon or evening showers and thunderstorms. It’s less likely to be continuous rain throughout the day.

Humidity and Sunshine:

• Humidity levels will be high, often making the heat feel more intense and sticky, averaging around 71%.
• You can still expect a good amount of sunshine, with an average of around 6-8 hours per day. However, the chance of completely sunny days decreases compared to the drier months.

Overall:

• May in Chiang Mai is characterized by very hot and humid conditions with a noticeable increase in rainfall.
• It’s considered part of the shoulder season, with fewer tourists than the peak (cool and dry) season. You might find better deals on accommodation.
• Despite the heat and rain, you can still enjoy Chiang Mai’s attractions. The rain can sometimes offer a temporary relief from the heat, and the vegetation will be lush and green.

Summary