Chiayi City weather in May
In May, Chiayi City sees average daytime highs of 28°C and overnight lows near 21°C, with 270 mm of rain across 22.1 wet days and about 13.1 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.
Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 17% of the time in May, and the air most often feels muggy.
Daylight stretches from about 12 h 54 min at the start of May to 13 h 18 min by month's end. Set against the rest of the year, May is Chiayi City's 9th-clearest and 9th-windiest month. For the whole year in context, see Chiayi City's year-round climate.
- Daytime high
- 28°
- 5th warmest
- Overnight low
- 21°
- 8th coldest
- Rainfall
- 270 mm
- 22.1 wet days
- Daylight
- 13 h 06 min
- 5:21 AM – 6:28 PM
- Cloud cover
- 71%
- 9th clearest
- Wind
- 6 km/h
- 9th windiest
- Solar energy
- 5.49 kWh/m²
- Travel score
- 4.3
- out of 10
Temperature in May
Day-to-day highs hold fairly steady near 28°C through the month.
A typical May day in Chiayi City reaches about 28°C in the afternoon and slips back to 21°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 30°C. Set against its neighbours, May runs about 2°C warmer than April and about 1°C cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Avg low (°C) | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 27 | 20 |
| 2 | 28 | 20 |
| 3 | 28 | 20 |
| 4 | 28 | 20 |
| 5 | 28 | 21 |
| 6 | 28 | 21 |
| 7 | 28 | 21 |
| 8 | 28 | 21 |
| 9 | 28 | 21 |
| 10 | 28 | 21 |
| 11 | 28 | 21 |
| 12 | 28 | 21 |
| 13 | 28 | 21 |
| 14 | 28 | 21 |
| 15 | 28 | 21 |
| 16 | 28 | 21 |
| 17 | 28 | 21 |
| 18 | 28 | 21 |
| 19 | 28 | 22 |
| 20 | 28 | 22 |
| 21 | 28 | 22 |
| 22 | 28 | 22 |
| 23 | 28 | 22 |
| 24 | 28 | 22 |
| 25 | 29 | 22 |
| 26 | 29 | 22 |
| 27 | 29 | 22 |
| 28 | 29 | 22 |
| 29 | 29 | 22 |
| 30 | 29 | 22 |
| 31 | 29 | 22 |
How May really feels in Chiayi City
Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Chiayi City weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.
| 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 May
The sky is clear or mostly clear about 17% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 68%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 39 | 38 | 37 | 38 | 38 | 38 | 38 | 39 | 39 | 39 | 38 | 38 | 39 | 38 | 37 | 36 | 34 | 33 | 31 | 31 | 29 | 27 | 26 | 25 | 24 | 23 | 22 | 22 | 21 | 20 | 20 |
| Cloudier (%) | 61 | 62 | 63 | 62 | 62 | 62 | 62 | 61 | 61 | 61 | 62 | 62 | 61 | 62 | 63 | 64 | 66 | 67 | 69 | 69 | 71 | 73 | 74 | 75 | 76 | 77 | 78 | 78 | 79 | 80 | 80 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 39 | 61 |
| 2 | 38 | 62 |
| 3 | 37 | 63 |
| 4 | 38 | 62 |
| 5 | 38 | 62 |
| 6 | 38 | 62 |
| 7 | 38 | 62 |
| 8 | 39 | 61 |
| 9 | 39 | 61 |
| 10 | 39 | 61 |
| 11 | 38 | 62 |
| 12 | 38 | 62 |
| 13 | 39 | 61 |
| 14 | 38 | 62 |
| 15 | 37 | 63 |
| 16 | 36 | 64 |
| 17 | 34 | 66 |
| 18 | 33 | 67 |
| 19 | 31 | 69 |
| 20 | 31 | 69 |
| 21 | 29 | 71 |
| 22 | 27 | 73 |
| 23 | 26 | 74 |
| 24 | 25 | 75 |
| 25 | 24 | 76 |
| 26 | 23 | 77 |
| 27 | 22 | 78 |
| 28 | 22 | 78 |
| 29 | 21 | 79 |
| 30 | 20 | 80 |
| 31 | 20 | 80 |
Chance of precipitation in May
Chiayi City gets around 270 mm of rain over 22.1 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 70% and peaks near 79% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 65 | 65 | 66 | 66 | 67 | 67 | 68 | 69 | 70 | 71 | 72 | 74 | 75 | 76 | 76 | 77 | 77 | 78 | 78 | 78 | 78 | 79 |
| Rain chance (%) | |
|---|---|
| 1 | 63 |
| 2 | 63 |
| 3 | 64 |
| 4 | 64 |
| 5 | 64 |
| 6 | 65 |
| 7 | 65 |
| 8 | 65 |
| 9 | 65 |
| 10 | 65 |
| 11 | 65 |
| 12 | 66 |
| 13 | 66 |
| 14 | 67 |
| 15 | 67 |
| 16 | 68 |
| 17 | 69 |
| 18 | 70 |
| 19 | 71 |
| 20 | 72 |
| 21 | 74 |
| 22 | 75 |
| 23 | 76 |
| 24 | 76 |
| 25 | 77 |
| 26 | 77 |
| 27 | 78 |
| 28 | 78 |
| 29 | 78 |
| 30 | 78 |
| 31 | 79 |
Humidity in May
Most of May feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the muggy band about 50% of days. Sticky, muggy-or-worse air turns up on roughly 95% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | 12 | 11 | 11 | 10 | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Muggy (%) | 76 | 76 | 74 | 73 | 72 | 72 | 69 | 68 | 67 | 64 | 63 | 60 | 58 | 56 | 54 | 51 | 49 | 46 | 44 | 42 | 40 | 38 | 36 | 33 | 31 | 29 | 27 | 25 | 23 | 22 | 20 |
| Oppressive (%) | 11 | 12 | 14 | 16 | 18 | 20 | 23 | 25 | 27 | 30 | 32 | 35 | 38 | 40 | 43 | 46 | 49 | 52 | 54 | 56 | 59 | 61 | 63 | 66 | 68 | 70 | 72 | 74 | 76 | 77 | 79 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 1 | 12 | 76 | 11 |
| 2 | 1 | 11 | 76 | 12 |
| 3 | 1 | 11 | 74 | 14 |
| 4 | 1 | 10 | 73 | 16 |
| 5 | 1 | 9 | 72 | 18 |
| 6 | 0 | 8 | 72 | 20 |
| 7 | 0 | 8 | 69 | 23 |
| 8 | 0 | 7 | 68 | 25 |
| 9 | 0 | 6 | 67 | 27 |
| 10 | 0 | 6 | 64 | 30 |
| 11 | 0 | 5 | 63 | 32 |
| 12 | 0 | 5 | 60 | 35 |
| 13 | 0 | 4 | 58 | 38 |
| 14 | 0 | 4 | 56 | 40 |
| 15 | 0 | 3 | 54 | 43 |
| 16 | 0 | 3 | 51 | 46 |
| 17 | 0 | 3 | 49 | 49 |
| 18 | 0 | 2 | 46 | 52 |
| 19 | 0 | 2 | 44 | 54 |
| 20 | 0 | 2 | 42 | 56 |
| 21 | 0 | 1 | 40 | 59 |
| 22 | 0 | 1 | 38 | 61 |
| 23 | 0 | 1 | 36 | 63 |
| 24 | 0 | 1 | 33 | 66 |
| 25 | 0 | 1 | 31 | 68 |
| 26 | 0 | 1 | 29 | 70 |
| 27 | 0 | 1 | 27 | 72 |
| 28 | 0 | 1 | 25 | 74 |
| 29 | 0 | 1 | 23 | 76 |
| 30 | 0 | 1 | 22 | 77 |
| 31 | 0 | 1 | 20 | 79 |
Wind in May
Winds average 6 km/h in May.
Across May, daily wind ranges from about 5 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in May
Daylight runs from about 12 h 54 min at the start of May to 13 h 18 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 24 minutes over May. Sunrise moves from 5:30 AM to 5:16 AM, and sunset from 6:21 PM to 6:35 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.9 | 12.9 | 12.9 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.2 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 | 13.3 |
| Sunrise (AM) | 5:30 | 5:29 | 5:28 | 5:27 | 5:27 | 5:26 | 5:26 | 5:25 | 5:24 | 5:24 | 5:23 | 5:23 | 5:22 | 5:22 | 5:21 | 5:21 | 5:20 | 5:20 | 5:19 | 5:19 | 5:18 | 5:18 | 5:18 | 5:17 | 5:17 | 5:17 | 5:17 | 5:16 | 5:16 | 5:16 | 5:16 |
| Sunset (PM) | 6:21 | 6:22 | 6:22 | 6:23 | 6:23 | 6:24 | 6:24 | 6:24 | 6:25 | 6:25 | 6:26 | 6:26 | 6:27 | 6:27 | 6:28 | 6:28 | 6:29 | 6:29 | 6:30 | 6:30 | 6:31 | 6:31 | 6:32 | 6:32 | 6:33 | 6:33 | 6:34 | 6:34 | 6:35 | 6:35 | 6:35 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 5:30 | 6:21 |
| 2 | 12.9 | 5:29 | 6:22 |
| 3 | 12.9 | 5:28 | 6:22 |
| 4 | 12.9 | 5:27 | 6:23 |
| 5 | 12.9 | 5:27 | 6:23 |
| 6 | 13.0 | 5:26 | 6:24 |
| 7 | 13.0 | 5:26 | 6:24 |
| 8 | 13.0 | 5:25 | 6:24 |
| 9 | 13.0 | 5:24 | 6:25 |
| 10 | 13.0 | 5:24 | 6:25 |
| 11 | 13.0 | 5:23 | 6:26 |
| 12 | 13.1 | 5:23 | 6:26 |
| 13 | 13.1 | 5:22 | 6:27 |
| 14 | 13.1 | 5:22 | 6:27 |
| 15 | 13.1 | 5:21 | 6:28 |
| 16 | 13.1 | 5:21 | 6:28 |
| 17 | 13.1 | 5:20 | 6:29 |
| 18 | 13.2 | 5:20 | 6:29 |
| 19 | 13.2 | 5:19 | 6:30 |
| 20 | 13.2 | 5:19 | 6:30 |
| 21 | 13.2 | 5:18 | 6:31 |
| 22 | 13.2 | 5:18 | 6:31 |
| 23 | 13.2 | 5:18 | 6:32 |
| 24 | 13.2 | 5:17 | 6:32 |
| 25 | 13.3 | 5:17 | 6:33 |
| 26 | 13.3 | 5:17 | 6:33 |
| 27 | 13.3 | 5:17 | 6:34 |
| 28 | 13.3 | 5:16 | 6:34 |
| 29 | 13.3 | 5:16 | 6:35 |
| 30 | 13.3 | 5:16 | 6:35 |
| 31 | 13.3 | 5:16 | 6:35 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.49 kWh/m².
For context, solar energy here swings from a low near 3.6 kWh/m² to a high of 5.62 kWh/m² in April across the year — May's 5.49 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.4 | 5.4 | 5.4 | 5.4 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.6 | Bright |
| 2 | 5.6 | Bright |
| 3 | 5.6 | Bright |
| 4 | 5.6 | Bright |
| 5 | 5.6 | Bright |
| 6 | 5.6 | Bright |
| 7 | 5.6 | Bright |
| 8 | 5.6 | Bright |
| 9 | 5.6 | Bright |
| 10 | 5.6 | Bright |
| 11 | 5.6 | Bright |
| 12 | 5.6 | Bright |
| 13 | 5.6 | Bright |
| 14 | 5.6 | Bright |
| 15 | 5.5 | Bright |
| 16 | 5.5 | Bright |
| 17 | 5.5 | Bright |
| 18 | 5.5 | Bright |
| 19 | 5.5 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.3 | Bright |
| 25 | 5.3 | Bright |
| 26 | 5.3 | Bright |
| 27 | 5.3 | Bright |
| 28 | 5.3 | Bright |
| 29 | 5.3 | Bright |
| 30 | 5.3 | Bright |
| 31 | 5.3 | Bright |
Hazard calendar for Chiayi City
In May, Chiayi City sits inside its pacific typhoon 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 May a good time to visit Chiayi City?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Chiayi City for sightseeing.
What to pack for Chiayi City in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Chiayi City sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 22 days see rain.
Sea temperature near Chiayi City in May
The nearest coast averages about 27°C in May — 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 May
Clear-sky midday UV in May peaks around 10 (very high — sun protection essential). 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 May
Average fine-particle pollution (PM2.5) through the year — so you can see where May 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).