Nakhon Si Thammarat runs on a different rainfall calendar than Phuket or Krabi. Here's the Gulf-side northeast-monsoon pattern explained month by month, framed for anyone settling in long-term rather than booking a holiday.
Nakhon Si Thammarat sits on the Gulf of Thailand side of the southern peninsula, which gives it a rainfall pattern that catches many newcomers off guard: October to December is genuinely wet here, with November averaging around 369mm of rain, at exactly the time Phuket and Krabi on the Andaman side are enjoying their driest, sunniest months. The more settled window runs roughly February to August. This page is written for people considering Nakhon Si Thammarat as a place to actually live, per BAANLYY's Nakhon Si Thammarat hub — not as a short holiday stop — so the emphasis is on what each season means for house-hunting, moving logistics and daily comfort.
This is the defining feature of Nakhon Si Thammarat's climate, and the one thing that most surprises new arrivals used to Thailand's typical "dry season = cool season" pattern. Sitting on the Gulf of Thailand side of the southern peninsula, the city catches the full force of the northeast monsoon exactly when the Andaman side (Phuket, Krabi, Phang Nga) is enjoying its driest, most popular months. November is the wettest month of the year here, averaging around 369mm of rain across 19 rainy days, with October and December both close behind. For anyone settling in long-term, this is the stretch to budget for higher humidity, occasional localised flooding and more indoor days.
Rainfall drops meaningfully from February onward, with February itself the driest month of the year (around 66mm across 9 rainy days). March through August still bring regular showers - this is the tropics, not a true dry season - but the pattern shifts to shorter, more typical afternoon downpours rather than the sustained, heavy northeast-monsoon rain of the October-December window. This is the more comfortable stretch for house-hunting, moving belongings in, and settling into a new routine.
January still carries some monsoon-season rainfall (around 135mm) as the northeast monsoon tapers off, while September sits on the edge of the wet season's return (around 158mm), building toward the October-December peak. Neither month is as reliably dry as the February-August core, but both are noticeably calmer than November.
Long-term (1991-2021) daytime highs, overnight lows, monthly rainfall and rainy-day counts, per compiled climate-station data.
| Month | High | Low | Rain | Rainy days | What it means |
|---|---|---|---|---|---|
| January | 28° | 23° | 135 mm | 15 | Monsoon tapering off; still meaningfully wet. |
| February | 29° | 23° | 66 mm | 9 | The driest month of the year - a good window for house-hunting. |
| March | 31° | 24° | 129 mm | 12 | Warming up, typical tropical afternoon showers. |
| April | 32° | 25° | 126 mm | 14 | The warmest month; still-moderate rainfall. |
| May | 32° | 25° | 132 mm | 18 | Frequent but shorter showers than the Oct-Dec pattern. |
| June | 31° | 25° | 97 mm | 16 | One of the lighter-rain months in this window. |
| July | 31° | 25° | 103 mm | 16 | Steady, typical wet-tropics rainfall. |
| August | 31° | 24° | 125 mm | 17 | Still part of the comparatively settled window. |
| September | 31° | 24° | 158 mm | 19 | Rain building again ahead of the northeast-monsoon peak. |
| October | 29° | 24° | 288 mm | 21 | Northeast monsoon arrives in force - the second-wettest month. |
| November | 28° | 24° | 369 mm | 19 | The wettest month of the year, and the most humid. |
| December | 28° | 23° | 250 mm | 16 | Still heavily wet, easing only gradually into January. |
| Season | What to bring or prepare |
|---|---|
| Northeast-monsoon wet season (Oct-Dec) | A proper rain jacket or poncho (a compact umbrella struggles in sustained monsoon rain), waterproof bags for electronics and documents, and quick-dry footwear. If you're moving in during this window, ask movers about weatherproofing for furniture and boxes. |
| Drier window (Feb-Aug) | Lighter rain protection is usually enough - a compact umbrella or packable jacket for typical afternoon showers. Sunscreen and a hat for the warmer, sunnier days from March to May. |
| Year-round | High humidity is a constant, so budget for air-conditioning running costs and consider a dehumidifier for ground-floor storage or wardrobes, especially through the wet season. |
The heaviest rain falls October through December, driven by the northeast monsoon hitting the Gulf side of the southern peninsula - November is the wettest month, averaging around 369mm of rain across 19 rainy days. This is the opposite pattern to Thailand's Andaman coast (Phuket, Krabi), where these same months are the dry season. February through August is comparatively drier and more settled, with February the driest month of the year.
Nakhon Si Thammarat sits on the Gulf of Thailand side of the southern peninsula, while Phuket and Krabi sit on the Andaman side. The northeast monsoon (roughly October-December) blows in from the Gulf and hits the east-facing coast hardest, which is exactly when the monsoon-sheltered Andaman side enjoys its best, driest weather. The two coasts effectively run on opposite rainfall calendars for part of the year.
February through August is the more settled window for a move - lower rainfall, easier house-hunting and moving logistics, and fewer disruptions from sustained heavy rain. If you must move during October-December, budget extra time for weather-related delays and ask any prospective landlord directly about the property's flood history in that window.
Temperatures are consistently warm to hot year-round with relatively little seasonal swing - daytime highs run from around 28°C in the wettest months to roughly 32°C at the April-May peak. Humidity stays high throughout the year, generally 80% or above, which affects daily comfort more than the temperature figure alone suggests.
Localised flooding is a realistic possibility in low-lying parts of the city during the October-December northeast-monsoon peak, particularly after multi-day rain events, though it is generally less severe or prolonged than the major river-basin flooding seen in central Thailand. It's worth asking a landlord or property manager directly about a specific building's drainage and flood history before committing to a lease in this window.
Primary and official sources are cited above. Government rules, fees and procedures in Thailand change over time and vary by office; always confirm current requirements with the relevant authority before relying on them. BAANLYY never takes paid placement in editorial content.
Now that you know the climate calendar, match your move-in timing to the right Nakhon Si Thammarat area and browse residences there.
General climate information based on long-term averages; actual weather varies year to year - check a current TMD forecast before you move. Hero photo by Tom Fisk on Pexels.