Chiayi City in Fall
In fall (September, October and November), Chiayi City sees average daytime highs around 27°C and overnight lows near 20°C, with 725 mm of rain over about 55 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 29°C in early September to 24°C by late November. The sky is clear or mostly clear about 27% of the time across fall, and the air most often feels oppressive.
Fall is Chiayi City's 3rd-best season to visit on our travel score. For the whole year in context, see Chiayi City's year-round climate.
- Avg daytime high
- 27°C
- 2nd-warmest season
- Avg overnight low
- 20°C
- Rainfall
- 725 mm
- 55 wet days
- Avg wind
- 5 km/h
- Travel score
- 5.2
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Chiayi City in Fall
Over the season highs ease from about 29°C in early September to 24°C by late November.
A typical fall day in Chiayi City reaches about 27°C and drops to 20°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Chiayi City
Once humidity and wind are folded in, fall brings about 15 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Chiayi City weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 20° / 12° | 53 | 10 | 10.7 | 6.6 |
| Feb | 21° / 13° | 62 | 11.6 | 11.2 | 6.3 |
| Mar | 24° / 16° | 85 | 13.3 | 11.8 | 6.4 |
| Apr | 26° / 19° | 144 | 16 | 12.5 | 5.7 |
| May | 28° / 21° | 270 | 22.1 | 13.1 | 4.3 |
| Jun | 29° / 23° | 365 | 24.2 | 13.4 | 3.3 |
| Jul | 30° / 24° | 555 | 26.7 | 13.3 | 3.0 |
| Aug | 30° / 24° | 667 | 28.5 | 12.8 | 2.9 |
| Sep | 29° / 23° | 436 | 24 | 12.1 | 3.6 |
| Oct | 27° / 20° | 207 | 18.6 | 11.4 | 5.3 |
| Nov | 25° / 18° | 81 | 12 | 10.9 | 6.7 |
| Dec | 22° / 14° | 60 | 10.7 | 10.6 | 6.8 |
Cloud cover in Fall
The sky is clear or mostly clear about 27% of the time across fall.
Chance of precipitation in Fall
Chiayi City gets around 725 mm of rain over 55 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 5 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 30 min in early September to 10 h 42 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.4 kWh/m².
Hazard calendar for Chiayi City
In fall, Chiayi City overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Chiayi City sits in the Pacific typhoon belt; the season peaks July–October.
Chiayi City's monsoon runs June–September, when most of the year's rain falls.
Is fall a good time to visit Chiayi City?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Chiayi City for sightseeing.
What to pack for Chiayi City in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Chiayi City sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 55 days see rain.
Sea temperature near Chiayi City in Fall
The nearest coast averages about 27°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 35 km away) is warmest in July at about 29°C and coldest in January near 22°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 22 | 22 | 23 | 25 | 27 | 28 | 29 | 29 | 28 | 27 | 25 | 23 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 22 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 25 | Warm |
| May | 27 | Warm |
| Jun | 28 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 28 | Tropical |
| Oct | 27 | Warm |
| Nov | 25 | Warm |
| Dec | 23 | Refreshing |
UV index in Chiayi City in Fall
Clear-sky midday UV across fall averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Chiayi City peaks around June 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 6 | 8 | 10 | 8 | 10 | 12 | 10 | 11 | 9 | 7 | 7 | 6 |
| Level | High | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 8 | Very high |
| Mar | 10 | Very high |
| Apr | 8 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 10 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 7 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Chiayi City in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Chiayi City is worst in March — around 40 µg/m³ PM2.5 (poor), about 1.7× the cleanest month (July, 23 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 36 | 36 | 40 | 36 | 28 | 24 | 23 | 25 | 31 | 33 | 34 | 33 |
| Level | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 36 | Poor |
| Feb | 36 | Poor |
| Mar | 40 | Poor |
| Apr | 36 | Poor |
| May | 28 | Moderate |
| Jun | 24 | Moderate |
| Jul | 23 | Moderate |
| Aug | 25 | Moderate |
| Sep | 31 | Moderate |
| Oct | 33 | Moderate |
| Nov | 34 | Moderate |
| Dec | 33 | Moderate |
Where is Chiayi City?
Chiayi City sits at 23.5°N, 120.4°E, 45 m above sea level, in Taiwan. The nearest listed city is Taibao, 12 km away.
Topography around Chiayi City
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chiayi City.
Within 3 km, the terrain around Chiayi City has only modest variations in elevation — a maximum elevation change of 84 m around an average of 40 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 860 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,887 m.
The land around Chiayi City is covered by artificial surfaces (65%) and trees (23%) within 3 km, trees (46%) and cropland (37%) within 16 km, and trees (47%) and water (32%) within 80 km.
Taiwan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 110 / 220 V · 60 Hz
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Chiayi City (23.4792°, 120.4489°, elevation 45 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.