# Si Racha in May: weather

Si Racha, Thailand (Southeast Asia). Ten-year climatology (2015-2024), not a forecast. Page: https://beaufixe.net/en/weather/si-racha/may

## Key figures

| Indicator | Value |
|---|---|
| Afternoon (mean daily max) | 31.3 °C |
| Night (mean daily min) | 27.4 °C |
| Sea (surface) | 31.1 °C |
| Rainy days (≥ 1 mm) | 20 / month |
| Relative humidity | 79 % |
| Probability of a 25 °C+ afternoon | 100 % |

## Month by month

| Month | Afternoon | Night | Sea | Rain (d) |
|---|---|---|---|---|
| January | 29.8 °C | 23.4 °C | 27.8 °C | 6 |
| February | 30 °C | 24.2 °C | 28.2 °C | 7 |
| March | 30.8 °C | 26.1 °C | 29.2 °C | 11 |
| April | 31.6 °C | 27 °C | 30.4 °C | 11 |
| May | 31.3 °C | 27.4 °C | 31.1 °C | 20 |
| June | 30.5 °C | 27.2 °C | 30.5 °C | 20 |
| July | 30 °C | 26.8 °C | 30.2 °C | 24 |
| August | 30 °C | 26.8 °C | 29.8 °C | 23 |
| September | 29.6 °C | 26.1 °C | 29.8 °C | 24 |
| October | 29.9 °C | 25.3 °C | 29.8 °C | 22 |
| November | 30.5 °C | 24.9 °C | 29.4 °C | 12 |
| December | 29.9 °C | 23.6 °C | 28.2 °C | 4 |

Best months : December, January, February.

## Before you go

- **Safety** : Outside the areas advised against. Parts of the country are advised against (Pattani, Yala and Narathiwat provinces and the south of Songkhla province (deep south); within 20 km of the Cambodian border); Si Racha is not one of them. (official advice updated 8 September 2026 — https://www.gov.uk/foreign-travel-advice/thailand)
- **Entry** (British passport) : No visa needed for stays of up to 30 days. Passport valid for at least 6 months. Complete the digital arrival card online within 3 days before arrival; you may be asked to show 10,000 baht per person and onward travel; 1 blank page. (per the UK Foreign Office, 8 September 2026)
- **Vaccines** : typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; Japanese encephalitis and chikungunya depending on activities and areas visited. Routine vaccines up to date (measles in particular).
- **Yellow fever** : No yellow fever locally, vaccine not recommended. Certificate required only if you arrive from a country with yellow fever risk.
- **Malaria** : Present. Areas: Primarily the provinces that border Burma (Myanmar), Cambodia (rare cases in Buri Ram Province), and Malaysia (especially in the rural forest and forest-fringe areas of these provinces) Rare to few cases in other parts of Thailand, including the cities of Bangkok (the capital), Chiang Mai, and Chiang Rai, or on the islands of Koh Pha Ngan, Koh Samui, or Phuket No malaria transmission on the islands of Krabi Province (Koh Lanta, Koh Phi Phi, Koh Yao Noi, Koh Yao Yai) or in Pattaya City. Preventive medication recommended: Provinces that border Burma (Myanmar), Cambodia (except Buri Ram Province), and Malaysia: Atovaquone-proguanil, doxycycline, tafenoquine All other areas with malaria transmission (including Buri Ram province): No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only) — prescribed before departure.
- **Mosquitoes** : dengue and Zika reported: protect yourself from bites.
  (per the CDC, page reviewed 25 August 2026 — https://wwwnc.cdc.gov/travel/destinations/traveler/none/thailand)

## Sources

Air, rain, humidity: ERA5-Land reanalysis (Copernicus) served by Open-Meteo (CC BY 4.0). Sea: NOAA OISST. Safety: FCDO (OGL v3), zones reviewed by Beau Fixe. Entry: France Diplomatie (Licence Ouverte 2.0) / FCDO. Health: CDC (public domain). Details: https://beaufixe.net/en/legal#sources

Beau Fixe — https://beaufixe.net — not a forecast; only the authorities are authoritative for safety, entry rules and health.