Spring in Surat Thani brings warm days, mild nights, and steady tropical conditions that really shape daily life along Thailand’s Gulf Coast. You’ll usually see daytime temperatures hovering near 90°F, and evenings don’t cool off much—most nights stick close to 80°F. It’s a consistently hot season, but most people find it manageable.
This mix of heat and humidity gives the climate a unique feel—sometimes energizing, sometimes just a bit heavy. How you plan your time outdoors definitely makes a difference.
Rainfall starts to pick up during spring, especially once May rolls around, but rain doesn’t really take over the whole season. You’ll get short, heavy showers that usually clear out fast, so there’s still plenty of time to check out the beaches, islands, and local culture.
Winds stay light to moderate, which brings a bit of comfort to the sticky air.
Knowing these patterns helps you figure out what to pack and how to schedule your plans. If you time it right, you’ll catch both the natural beauty and cultural highlights of Surat Thani—without getting blindsided by a sudden downpour.
Spring Weather Overview in Surat Thani
Spring in Surat Thani means rising heat, steadily high humidity, and more rain as the months go by. Skies get cloudier, and the tropical climate brings a mix of warmth and frequent showers that really set the mood each day.
Typical Spring Climate Conditions
Expect daily highs around 92–93°F (33–34°C), with lows between 73–76°F (23–24°C). April usually brings the hottest days, and in May, nights get a little cooler but rain picks up.
Humidity hovers close to 100% muggy conditions, so the air feels heavy all day and night. By late May, skies look mostly cloudy or just plain overcast.
Rainfall ramps up fast. Early March averages about 1–2 inches of rain over 31 days, but by late May, totals can hit 7–8 inches. Wet days get more common too, shifting from 1 in 10 days in March to more than 1 in 2 days by the end of May.
Winds keep things gentle, averaging 5 mph. They blow from the east in March and April, then switch to the west in May. Sea surface temperatures warm up a bit, from 84°F (29°C) to 86°F (30°C), so coastal waters stay nice for swimming.
Comparison to Other Seasons
Compared to winter, spring feels hotter and stickier. January and February usually bring cooler nights and less rain, but by March, you’ll notice the shift toward wetter, tropical weather.
Summer just blends right into the monsoon—heavier rains and more clouds than spring. Autumn, especially October, often brings the most rain all year.
Spring doesn’t really give you those long stretches of clear skies like winter does. Sunshine hours drop as clouds build, so solar energy reaching the ground falls from around 6.5 kWh to 4.1 kWh per day.
If you visit in spring, you might notice the days getting a bit longer. Daylight grows from about 12 hours in early March to just over 12.5 hours by late May, so you get more usable daylight, even as things get wetter.
Regional Influences on Weather
Surat Thani sits right on the Gulf of Thailand coast, and the tropical monsoon climate has a big impact on spring weather. Warm sea temperatures keep the air humid and help fuel heavy showers as the season goes on.
In March and April, eastern winds bring in drier air. By May, western winds start blowing in more moisture from the Gulf, and that’s when rain and clouds really pick up.
The low elevation and surrounding cropland don’t offer much relief from the heat. You won’t find cooler mountain air here like you might in northern Thailand. The flat land and coastal weather keep things warm and sticky nearly all the time.
Because of these local quirks, spring in Surat Thani feels more humid and unsettled than inland areas. You’ll want to plan for frequent rain and not much sunshine.
Spring Temperatures: What to Expect
Spring in Surat Thani brings warm weather that doesn’t really swing much between day and night. Temperatures rise steadily from March through May, with April usually the hottest. Nights stay humid and mild, so it feels warm almost all the time.
Average Daytime and Nighttime Temperatures
During spring, daytime highs usually land between 87°F and 93°F (31°C–34°C). It’s rare for temps to break 97°F, so while it’s hot, you don’t often get those extreme highs.
At night, things only cool off a little. Nighttime lows range from 73°F to 77°F (23°C–25°C), so evenings stay warm and sticky. Heavy clothing? Forget it—even after dark.
The small gap between day and night temps means it’s just steadily warm. Humidity makes the air feel hotter than the numbers show. If you’re traveling, lightweight clothes and lots of water are a must, day or night.
Temperature Trends from March to May
From early March to late May, the air warms up bit by bit. In March, highs are around 90°F (32°C) and lows near 73°F (23°C). April brings a slight bump, with highs peaking at 93°F (34°C) and lows around 75°F (24°C).
May doesn’t get much hotter than April, but humidity and rainfall go up, making the warmth feel heavier. Nighttime lows in May hit about 77°F (25°C), the highest for spring.
So, mornings get warmer and those cooler evenings fade as spring moves along. March feels hot and dry, but by May, it’s hot and wet.
Hottest and Coldest Spring Months
April stands out as the hottest month of spring. Average highs reach 93°F (34°C), and many see it as the peak of heat before heavier rains arrive. If you visit then, expect strong sun and really warm nights.
March is the coolest spring month, though it’s still hot by most standards. Highs average 90°F (32°C), and lows dip closer to 73°F (23°C). March tends to feel a bit more comfortable, especially at night.
By May, the heat sticks around, but rising humidity and rain make it feel different from the drier warmth of earlier months. It’s not the hottest, but May’s higher nighttime lows can feel less refreshing.
Precipitation Patterns During Spring
Spring in Surat Thani marks a big shift in rainfall as things move from dry months into the wetter monsoon season. You’ll see steady changes in how much it rains, how often, and when the wettest days hit.
Monthly Rainfall Amounts
March usually stays pretty moderate, with rainfall totals averaging 40–70 mm. It’s one of the drier months, but you’ll still get the occasional shower.
By April, rain picks up, with monthly averages often between 90–120 mm. This jump links to higher humidity and the early effects of the southwest monsoon.
May brings a real spike, with totals often topping 180 mm. That’s the start of the wet season, so you’ll notice heavier and more frequent downpours.
| Month | Average Rainfall (mm) |
|---|---|
| March | 40–70 |
| April | 90–120 |
| May | 180+ |
Wettest and Driest Spring Periods
March stands out as the driest spring month. Rainfall is lighter and less frequent, which makes it easier for outdoor adventures and travel.
April mixes sunny and wet days. It’s still manageable if you like a blend of dry weather with the occasional shower.
May is the wettest spring month. Heavy rain becomes common, and storms can pop up fast in the afternoons or evenings. If you’re planning a visit, expect wetter conditions and possible disruptions to outdoor plans.
Rainy Days Frequency
You’ll get around 7–10 rainy days in March. Showers usually don’t last long and often clear quickly.
April brings more rain, with 12–15 days of measurable precipitation. Rain spreads out more evenly, but many days still have long dry spells.
By May, rainy days jump to 18–20 days. Showers can be heavy but are often packed into certain times of day, leaving other hours dry. This pattern is classic for Surat Thani’s tropical monsoon climate.
Humidity and Dew Point Levels
Spring in Surat Thani means the air stays packed with moisture, affecting how warm or sticky it feels. Humidity and dew point together shape how comfortable you’ll feel and how you plan your time outside.
Average Humidity in Spring
You can count on average humidity levels between 75% and 85%. Mornings often feel extra damp, with humidity peaking before sunrise. By afternoon, it may dip a bit, but it’s still muggy.
The air here holds a lot of water vapor, no matter the month. Even in March—one of the drier times—humidity rarely drops below 70%. By May, daily rain bumps the average up, making the air feel even heavier.
This constant moisture slows down how fast sweat evaporates, so you might feel warmer than the thermometer says. Most travelers swear by light clothes and frequent hydration to stay comfortable.
Dew Point Variations
The dew point tells you just how humid it feels. In Surat Thani’s spring, dew points stay high, usually 23°C to 25°C (73°F to 77°F). That’s very humid air—just a little extra heat can make it feel oppressive.
March brings slightly lower dew points, around 23°C. By May, they climb toward 25°C, thanks to all the extra heat and moisture. That’s why the air feels stickier as spring goes on.
Dew point affects comfort more directly than relative humidity. If it’s above 24°C, you’ll probably feel sweaty and uncomfortable during outdoor activities, even if the temperature isn’t extreme.
Impact on Comfort and Outdoor Activities
High humidity and dew point really change how you experience the outdoors. Activities like hiking or biking can feel more exhausting because your body struggles to cool down. You might feel tired faster than you would in drier places.
If you’re sightseeing or walking around, mornings and evenings are usually better. Humidity is a bit lower and temperatures are cooler. Midday? That can feel rough, especially in May when both heat and dew point hit their peak.
Staying near the coast gives you a sea breeze, which helps a bit, but doesn’t actually lower the moisture in the air. Moisture-wicking clothes, lots of water, and regular breaks indoors make a big difference in handling the sticky weather.
Spring Winds: Speed and Direction
Spring in Surat Thani brings steady breezes that shape how comfortable the days feel and can affect travel. Expect moderate wind speeds, a clear seasonal peak, and predictable directions—handy if you’re planning outdoor activities or boat trips.
Average Wind Speed by Month
During spring, wind speeds usually stay moderate. You’ll see 6 to 10 knots (about 11–18 km/h), which feels like a gentle to moderate breeze. It’s enough to keep the air moving, but not strong enough to mess with most plans.
In March, winds are lighter, closer to the lower end. By April, speeds tick up a bit as wetter weather approaches. May usually brings stronger winds, with daily averages near 10 knots.
This gradual increase matters if you’re headed to the beach or planning a boat ride. Calmer seas in March, a bit more movement by April and May.
| Month | Average Wind Speed |
|---|---|
| March | 6–8 knots |
| April | 7–9 knots |
| May | 8–10 knots |
Windiest Month in Spring
The windiest month in Surat Thani’s spring is usually May. By this point, the southwest monsoon starts to shape the weather, and winds pick up compared to earlier in the season.
You’ll probably notice those stronger afternoon breezes in May. Ferries and smaller boats sometimes get delayed or rescheduled because of it.
Winds aren’t wild, but they’re steady and much more obvious than in March or April.
If you’re traveling, May isn’t the best for glassy sea conditions, but it’s a great time if you’re into sailing or windsurfing.
The breeze can also knock down the humidity a bit, so the heat feels a little less oppressive on land.
Typical Wind Directions
During spring, Surat Thani’s wind direction shifts gradually. In March, winds usually come from the northeast.
As the weeks go by, winds start turning more toward the southwest.
This shift happens because the northeast monsoon fades and the southwest monsoon takes over.
By May, southwest winds blow in, bringing extra moisture from the Indian Ocean.
March tends to feel drier, but April and May bring in more humid air.
If you’re sensitive to humidity or planning outdoor adventures, it’s good to know about this switch.
Practical Tips for Visiting Surat Thani in Spring
Spring in Surat Thani brings hot days, sticky air, and brief, frequent rain showers. With a little planning, you can still get outside, stay comfortable, and actually enjoy it.
Best Activities for Spring Weather
Temperatures in spring often hit the mid-30s °C (90s °F). It’s smarter to do outdoor stuff early in the morning or late in the afternoon when the sun isn’t as punishing.
Try visiting temples like Wat Phra Borommathat Chaiya during those cooler hours.
Island hopping to Koh Samui or Koh Phangan is popular, but catch the boats early before the sun gets intense.
Rain showers don’t stick around for long, so checking out waterfalls like Khun Thale or Khao Sok National Park after rain can be pretty rewarding. The greenery looks fresh and streams flow nicely this time of year.
If you need a break from the heat, local markets and food tours are solid indoor options.
Packing Recommendations
Pack light, breathable clothes—cotton or linen are your friends here. These fabrics help air flow and keep you from overheating in the humidity.
Don’t forget a wide-brimmed hat and sunglasses for sun protection.
Bring a small umbrella or a lightweight rain jacket. Showers pop up often, and having something handy keeps you dry without weighing you down.
For shoes, grab comfortable sandals for wandering around town, and sturdy shoes if you’re hiking in Khao Sok or other wild spots.
A small daypack with a refillable water bottle is a must. It’s way too easy to get dehydrated, so keep water with you wherever you go.
Weather-Related Travel Advice
Try to plan your day with the weather in mind. I usually go for outdoor sightseeing or travel in the morning, then I take a break or find something indoors once midday heat hits.
In spring, it rains anywhere from 4 to 10 days each month. Ferries or buses might get delayed, so I always leave a little buffer time between connections—just in case.
I recommend booking a place with air conditioning or at least a solid fan. Nights tend to stay warm and humid, and honestly, decent cooling can really save your sleep.
Before heading to any island, I check local forecasts. Sudden storms sometimes mess with boat schedules, and having the latest info helps me dodge those hassles.