If you’re planning a trip to southern Thailand, you’ll want to think about how the weather might shape your whole experience. Fall in Surat Thani drops you right into the wet season, where warm days and frequent downpours go hand in hand.
Daytime highs usually hit around 30–32°C (86–90°F), and the humidity is no joke. October and November especially bring heavy rainfall.
You won’t get constant storms, but regular showers show up, often suddenly, and clear out just as fast. The skies flip between sunny and cloudy, giving the days a rhythm that locals know well.
If you know when the rain hits hardest and when things lighten up, you can plan your days with fewer surprises.
Fall here is a time of change. September starts off warm and wet, October gets drenched, and by November, things slowly begin to dry out.
If you’re hoping to explore the city, hop over to the islands, or just soak up the tropical monsoon vibe, it helps to know what’s coming.
Overview of Fall Weather in Surat Thani
Surat Thani sticks with hot and humid weather all fall, and rainfall is pretty frequent. You’ll notice warm days, cooler nights, and a clear shift in cloud cover compared to the dry season.
Typical Fall Temperatures
Usually, daytime temperatures run from 85°F to 89°F (29°C to 32°C) in fall. In September, highs hang around 89°F, but by November they drop to about 84–85°F.
Nights stay warm too, averaging 74°F to 77°F (23°C to 25°C).
There’s not a big difference between day and night, so expect steady warmth around the clock. October brings slightly cooler nights than September, and November keeps that trend going.
Humidity stays high, making the heat feel even stronger. If you’re outside, the mix of warmth and humidity can really wear you out unless you find some shade or take breaks.
| Month | Avg High °F (°C) | Avg Low °F (°C) |
|---|---|---|
| September | 87–89 (30–32) | 74–75 (23–24) |
| October | 85–88 (29–31) | 75–76 (24–25) |
| November | 84–85 (29) | 76–77 (25) |
Rainfall and Precipitation Patterns
Rainfall really defines the fall season in Surat Thani. September and October are some of the wettest months, with 200–270 mm of rain on average.
Most days bring heavy showers or thunderstorms.
October usually gets 20–24 rainy days, while September sees about 19. By November, rainfall is still high—350 mm or more—but the number of rainy days starts to level off.
You’ll see short, intense downpours rather than rain that lasts all day. Roads and outdoor spots can flood fast, so you might need to adjust your travel plans on the fly.
Even with all the rain, the sun still manages to peek out between storms.
Seasonal Climate Characteristics
Fall in Surat Thani means high humidity, frequent rainfall, and warm temperatures. Clouds are common, but you’ll usually get a few hours of sun each day.
Sunshine averages about 5–6 hours daily, which is less than what you’d get in the dry season.
The sea stays warm at around 29°C (84°F), so beach activities are possible, but rougher seas and storms might mess with ferry schedules.
UV levels stay high, even if it looks cloudy. If you’re outside, keep up with sun protection.
The air feels muggy, and the combo of heat, humidity, and rain really sets the mood for the season.
Monthly Fall Climate Breakdown
Fall in Surat Thani brings steady warmth, but the rainfall patterns change a lot. Humidity stays up there, and the number of wet days can make outdoor plans a bit tricky.
September Weather Highlights
September brings some of the year’s heaviest rain to Surat Thani. You’ll get about 188 mm of precipitation spread over nearly 19 days.
Most weeks have several wet days, usually with short, heavy showers.
Temperatures stay warm, with highs around 32°C (90°F) and lows near 23°C (73°F). The sea’s still at about 29°C (84°F), so it’s great for swimming, rain or shine.
Humidity sticks above 80%, which can feel sticky, especially in the afternoons.
Sunshine is limited, so it’s smart to have indoor activities or a flexible schedule. Waterproof clothing and light, breathable fabrics are good choices.
October Weather Highlights
October takes you deeper into the monsoon season. Rainfall stays high, averaging 236 mm, and showers pop up on most days.
Storms show up more often, and clouds are usually hanging around.
Daytime highs dip a bit to about 31°C (88°F), and nighttime lows hover near 23°C (73°F). Humidity stays high, often close to 85%.
The UV index is still strong, so don’t skip sun protection when the clouds break.
With 18–20 rainy days, you might run into travel delays and muddy rural roads.
Sea conditions can get rough, and ferry schedules sometimes change. If you’re island-hopping, checking the weather and transport updates ahead of time helps.
November Weather Highlights
November usually brings the most rain in Surat Thani. Rainfall peaks at about 330 mm, and heavy downpours are common.
You might see flooding in low-lying areas, especially after a few days of rain.
Temperatures cool just a bit, with highs near 30°C (86°F) and lows around 23°C (73°F). Humidity goes up to about 87%, so the air feels heavy.
Rainy days are the norm, but showers usually don’t last long. If you’re visiting, bring solid rain gear and keep your plans flexible.
The sea stays warm, but rough waters can make swimming and ferry trips a little risky.
Temperature Trends and Daily Ranges
In Surat Thani, fall temperatures stay warm but drop a little as the season goes on. Daytime highs ease down, and nights don’t change much, so you get a pretty narrow range between day and night.
Average Daytime and Nighttime Temperatures
During fall, daytime highs in Surat Thani average between 85°F and 89°F (29°C–32°C). The heat is steady, with just a small drop of 4–5°F from September to November.
You rarely see highs below 80°F or above 93°F.
At night, low temperatures hover close to 75°F (24°C). These numbers hardly budge through the season, rarely dropping below 72°F or climbing above 76°F.
So, evenings stay warm and humid, with little relief from the daytime heat.
Since both highs and lows are close together, you get warm conditions all day and night. Unlike some tropical places with cooler nights, Surat Thani’s coastal spot and high humidity keep things steady.
| Time of Day | Typical Range (°F) | Typical Range (°C) |
|---|---|---|
| Daytime | 85–89 | 29–32 |
| Nighttime | 72–76 | 22–24 |
Temperature Fluctuations During Fall
You’ll notice that daily temperature swings in Surat Thani are small. The gap between day and night averages only 10–14°F (6–8°C), which isn’t much compared to inland places.
The biggest shift is in the afternoons cooling off a bit from September to November.
While mornings and nights feel pretty much the same, midday heat eases off a bit as fall goes on.
Humidity matters here too. High moisture in the air stops things from cooling off much after sunset, so nights stay muggy.
You can expect warm conditions whether you’re out in the afternoon or walking around at night.
For travelers, this makes packing simple. Lightweight clothes work for both day and night, and you won’t need extra layers.
Rainfall and Humidity in Fall
You’ll get frequent rain showers and steady high humidity in Surat Thani during fall. Rainfall changes as the season moves along, but the air stays humid and often feels heavy all the time.
Monthly Rainfall Amounts
Rainfall in Surat Thani during fall is both heavy and a bit unpredictable. Early September brings average 31‑day totals of about 232 mm (9.1 in), with rain falling on more than half the days.
By late November, totals drop a little to around 223 mm (8.8 in), but showers are still common.
The wettest period usually hits in late October to early November. Around then, average accumulation peaks at nearly 276 mm (10.9 in) over a month.
Rain often comes in short, intense bursts, which can mess with travel, especially if you’re planning boat trips or outdoor adventures.
Even though rainfall drops a bit at the end of the season, you should still be ready for wet weather. Carrying light rain gear and having indoor backup plans is smart since downpours can show up fast.
Relative Humidity Levels
Humidity in Surat Thani stays really high in fall, with almost 100% of days feeling muggy. You’ll feel the moisture in the air almost all the time, even at night.
Unlike temperature, which shifts a little from day to night, humidity barely changes.
Dew points usually stay above 21°C (70°F), which keeps things feeling damp. This makes outdoor activities feel hotter than the thermometer says.
Wearing light, breathable fabrics helps you stay comfortable.
Because of the constant humidity, your clothes and gear dry slowly. If you’re sensitive to muggy weather, plan to spend more time indoors with AC during the stickiest parts of the day.
Wind Speed and Weather Patterns
During fall in Surat Thani, steady breezes and changing wind directions shape the local weather. These patterns affect humidity, rainfall, and how comfortable it feels outside.
Typical Wind Speeds in Fall
From September through November, you’ll feel moderate winds averaging 8 to 12 km/h (5–7 mph). Speeds pick up toward late November as the windier season rolls in.
The calmest weather usually comes in September, when the wet season is still going and winds are light.
By October, stronger breezes show up, often along with more rain.
In November, hourly wind speeds rise, kicking off the windiest time of year. December is usually the peak, but by November you’ll already notice the change.
These wind speeds aren’t extreme, but they can affect things like boating or ferry trips to the islands. It’s a good idea to check the daily forecast if you plan to travel by sea.
| Month | Avg. Wind Speed | Conditions |
|---|---|---|
| September | ~8 km/h | Light, humid |
| October | ~9–10 km/h | Breezy, frequent rain |
| November | ~11–12 km/h | Stronger, drier air begins |
Influence of Monsoon Winds
The monsoon cycle plays a big role in Surat Thani’s fall weather.
In September and October, the southwest monsoon is still in charge, bringing heavy rain and onshore winds from the Indian Ocean. That means humid, stormy conditions.
By November, the northeast monsoon starts to take over. Winds shift, blowing from the Gulf of Thailand onto land. This change cuts down on rain but brings stronger winds and more moving clouds.
The switch between these two systems makes November a turning point. You’ll see fewer storms but stronger breezes, especially near the coast.
For travelers, early fall feels damp and unpredictable, while late fall brings clearer skies but rougher seas. If you’re heading to the islands, November’s winds might make ferry rides a bit bumpier than in September.
Best Time to Visit Surat Thani in Fall
Fall in Surat Thani means heavy rainfall, sticky humidity, and pretty warm temperatures. If you plan things right, you can still enjoy the region’s islands, forests, and cultural spots, but you’ll want to dodge the worst of the wet weeks.
Ideal Months for Travel
September, October, and November all fall within the autumn season here, though the weather changes a lot. September and October usually bring the most rain, with totals often over 180–230 mm and frequent storms.
You might see about 17–20 rainy days each month, which can mess with boat trips and any outdoor adventures you had in mind.
November works out better for most travelers. Rain finally starts to let up, dropping from around 330 mm in October to about 129 mm by December.
Daytime temperatures stay toasty, with highs around 30–32°C (86–90°F) and lows near 23°C (73°F). Humidity doesn’t really go away, but you’ll notice more dry days than before.
If you want to avoid weather headaches, late November is your best bet for fall. You’ll get more reliable trips to nearby islands like Koh Samui and Koh Phangan, and you won’t have to deal with big tourist crowds either.
Travel Tips for Fall Visitors
You’ll want to get ready for frequent rain showers, especially in September and October. Pack light rain gear, quick-dry clothes, and some waterproof covers for your electronics.
Heavy downpours can flood roads, so plan for extra travel time if you’re heading between the city and the ferry terminals.
Sometimes, rough seas force people to cancel boat trips to the Gulf islands. It’s smart to book flexible ferry tickets, just in case.
Keep a few backup activities ready on the mainland, like checking out temples, wandering through markets, or chasing waterfalls you can reach even if it’s pouring.
Mosquitoes get more active after the rain, so don’t forget insect repellent.
And even on cloudy days, the UV index stays high—sunscreen and hats are must-haves if you plan to be outside.
A little planning goes a long way, and you can still soak up Surat Thani’s culture and nature in the fall.