# Yilan in December: weather

Yilan, Taiwan (Asia). Ten-year climatology (2015-2024), not a forecast. Page: https://beaufixe.net/en/weather/yilan/december

## Key figures

| Indicator | Value |
|---|---|
| Afternoon (mean daily max) | 19.8 °C |
| Night (mean daily min) | 15.7 °C |
| Sea (surface) | 23.6 °C |
| Rainy days (≥ 1 mm) | 21 / month |
| Relative humidity | 82 % |
| Probability of a 25 °C+ afternoon | 4 % |

## Month by month

| Month | Afternoon | Night | Sea | Rain (d) |
|---|---|---|---|---|
| January | 18.6 °C | 13.9 °C | 22.3 °C | 18 |
| February | 19.1 °C | 14.1 °C | 22.4 °C | 17 |
| March | 21.5 °C | 15.5 °C | 23.2 °C | 17 |
| April | 24.3 °C | 18.3 °C | 24.4 °C | 18 |
| May | 26.9 °C | 21.7 °C | 26.2 °C | 21 |
| June | 29.5 °C | 24.4 °C | 27.7 °C | 21 |
| July | 30.6 °C | 25.1 °C | 28.6 °C | 18 |
| August | 30.1 °C | 25 °C | 28.7 °C | 21 |
| September | 28.8 °C | 23.8 °C | 28.2 °C | 21 |
| October | 25.9 °C | 21.9 °C | 26.7 °C | 23 |
| November | 23.4 °C | 19.4 °C | 25.1 °C | 23 |
| December | 19.8 °C | 15.7 °C | 23.6 °C | 21 |

Best months : July, August, June.

## Before you go

- **Safety** : No specific restrictions. Usual precautions apply. (official advice updated 28 August 2026 — https://www.gov.uk/foreign-travel-advice/taiwan)
- **Entry** (British passport) : No visa needed for stays of up to 90 days. Passport valid for at least 6 months. Submit the Taiwan Arrival Card (TWAC) online within 3 days before arrival; the 90-day visa-free stay can be extended by a further 90 days in Taiwan. (per the UK Foreign Office, 28 August 2026)
- **Vaccines** : hepatitis A and hepatitis B if you are not already vaccinated; Japanese encephalitis depending on activities and areas visited. Routine vaccines up to date (measles in particular).
- **Yellow fever** : No yellow fever locally, vaccine not recommended. No entry requirement.
- **Malaria** : None.
- **Mosquitoes** : dengue reported: protect yourself from bites.
  (per the CDC, page reviewed 25 August 2026 — https://wwwnc.cdc.gov/travel/destinations/traveler/none/taiwan)

## 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.