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On the thirty-year normal, Hua Hin’s driest month is December (11.9 mm), wettest is October (250.4 mm), hottest is May (33.7°C mean daily maximum) and coolest is January (22.8°C mean daily minimum). Hua Hin’s 935.9 mm annual total is the lowest of twelve Thai stations this site has checked against the same normals — but its own wettest month is still wetter than Pattaya’s.
The season bands, honestly
Hua Hin’s reputation as Thailand’s dry-coast town is real on the annual numbers, but the month-by-month picture has more nuance than the reputation suggests.
| Window | Measured conditions | What that means here |
|---|---|---|
| Nov – Jan | Cool, dry season. January coolest (22.8°C). | The best window on the numbers: low rain, the coolest nights of the year, and the calendar most kitesurfers and long-stay visitors already plan around. |
| Feb – Apr | Warming, still comparatively dry. | Rain stays low relative to the rest of Thailand even as heat builds. |
| May | Hottest month (33.7°C). | Unusual timing: most Thai stations checked against this dataset peak in April, not May. |
| Jun – Sep | Southwest monsoon reaches the Gulf coast, moderate rain. | Still far less rain than Phuket or Koh Lanta see in the same months — the rain shadow effect locals describe, though no official source we could open explains the mechanism. |
| Oct | Wettest month (250.4 mm) — higher than Pattaya's own peak (224.5 mm). | The one month that breaks the "driest place in Thailand" reputation. Heavy-rain events do reach Hua Hin; they are shorter and drain faster than in wetter provinces, not absent. |
| Dec | Driest month (11.9 mm). | The single driest month of the driest station in this dataset. |
All figures are 1991–2020 normals for WMO station 48475 (Hua Hin). The “what that means here” column is our own reading against the flood report below, not a separate data source.
Driest overall is not flood-proof
A Bangkok Post report on a monsoon-trough event over the upper South is the clearest illustration on record. The same system that flooded Cha-am’s municipal area, market and beach roads 20–40 cm deep also produced standing water on a two-kilometre stretch of Hua Hin’s own Phetkasem Highway — the difference being that in Hua Hin the water drained and the road was dry again by 10am the same morning, while Cha-am’s flooding was worse and slower to clear.
The pattern this suggests: Hua Hin sits inside the same regional weather systems as its wetter Gulf coast neighbours, it just gets less total rain and appears to clear faster when heavy rain does fall. That is a real, sourced difference from Cha-am and Pattaya — not a claim that Hua Hin is immune.
What we could not confirm
- Why Hua Hin is measurably drier than its Gulf coast neighbours. Local descriptions commonly attribute this to a rain-shadow effect from mountains to the west, but we could not find an official Thai Meteorological Department source that states this mechanism for Hua Hin specifically, so this page reports the measured rainfall difference without asserting a cause.
- Why Hua Hin's hottest month is May rather than the April peak seen at most other Thai stations checked against this dataset. The normal shows the fact; no official source explains the one-month lag.
- A full monthly rainfall or temperature table beyond the four extreme months. The archive that would supply every other month could not be reached from this run.
- An official flood-frequency count for Hua Hin (e.g. days of standing water per year). The evidence here is one detailed news report of one event, not a published statistic.
Frequently asked questions
Among the twelve stations this site has checked against the same WMO 1991–2020 normals, yes — Hua Hin's 935.9 mm a year is the lowest annual total, ahead of the next-driest, Pattaya, at 1,105.8 mm. See our Compare Thai Cities page for the full twelve-station table. "Driest of twelve checked stations" is a narrower and more honest claim than "driest in Thailand," since we have not checked every station Thailand operates.
December to January, on the numbers. December is the driest month at 11.9 mm and January is the coolest at a 22.8°C daily-minimum mean — the northeast monsoon settles in and brings the calmest, most comfortable stretch of the year. This is also the core of the kitesurfing season locals and operators plan around; see our dedicated kitesurfing guide for the wind detail, which this page does not repeat.
No, and a Bangkok Post report on a monsoon-trough event makes the honest picture concrete: the same storm that flooded Cha-am's market and beach roads 20–40 cm deep also left standing water on a two-kilometre stretch of Hua Hin's Phetkasem Highway — though in Hua Hin's case the water drained and the road was dry again by 10am the same morning. The pattern that emerges is Hua Hin gets hit by the same regional weather systems as its wetter neighbours, but with less total rain and faster drainage, not zero flood risk.
That is what the thirty-year normal shows — Hua Hin's hottest month by daily-maximum mean is May at 33.7°C, one month later than the April peak recorded at most other Thai stations this site has checked. We have not found an official meteorological explanation specific to Hua Hin's one-month lag, so this page states the measured fact without asserting a cause.
October, at 250.4 mm — which is actually higher than Pattaya's own wettest month (224.5 mm, also in October). The two towns share the same wet-season timing on the Gulf coast; Hua Hin's lower annual total comes from having much less rain the rest of the year, not from a lighter October specifically.
Related guides
- Kitesurfing in Thailand — the wind season Hua Hin's cool, dry window lines up with.
- Best time to visit Pattaya — the other major Gulf coast town, wetter overall.
- Hua Hin vs Pattaya — the fuller side-by-side comparison.
- Compare Thai cities — the same normals for twelve stations, side by side.
- Living in Hua Hin — the neighbourhood guide.
- Explore Thailand — the section this guide sits in.
Timed your visit. Now time the move.
If Hua Hin is more than a trip, see what is actually listed here before the next wet season sets your calendar.
Sources & References
- WMO Climatological Standard Normals 1991–2020 — Thailand station data sheets (NCEI Accession 0253808), Hua Hin station 48475: annual rainfall of 935.9 mm over 72.9 rain days — the driest of the twelve Thai stations checked against this dataset — wettest month October (250.4 mm), driest month December (11.9 mm), hottest month May at a 33.7°C daily-maximum mean, coolest month January at a 22.8°C daily-minimum mean
- Bangkok Post — "Flooding in Cha-am, Hua Hin": a monsoon trough over the upper South brought heavy rain from around 4am; Cha-am's municipal area, market and beach roads flooded 20–40 cm deep, while in Hua Hin itself rain pooled on a two-kilometre stretch of Phetkasem Highway but drained and the road was dry by 10am the same morning
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.
