Climate guideThirty-year normals for Seto
Seto climate by month
Humid subtropical · CfaBest Apr · Oct–Nov
Annual mean14°day and night
Seasonal swing24°warmest vs coolest
Precipitation1,901 mm160 wet days a year
35.23° N, 137.10° EElevation 111 mUTC+9 · Japan Standard Time
When to goSeto · weather score
Best timeApr · Oct–Nov
October: high / low21° / 12°
iSummary
What the weather is like
Seto has a humid subtropical climate (Köppen Cfa): rain spread through the year and no real dry season.
The warmest month is August, when afternoons average 30° and nights 22°. January is the coolest month, with highs of 8° and lows of -2°. The difference between the warmest and the coolest month is about 24°, a large swing typical of continental interiors.
About 1,901 mm of precipitation falls in an average year. July is the wettest month (240 mm, 22 wet days) and November the driest (98 mm, 8 wet days). Cloud cover ranges from 24% in December to 58% in June.
Compared with Tokyo, the capital, Seto is 1° warmer on a August afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 30° · August
- Coldest nights
- -2° · January
- Wettest month
- July
- Driest month
- November
- Clearest skies
- December · 24% cloud
- Longest day
- 14 h 31 min
- Shortest day
- 9 h 48 min
iiCharts
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columnsTemperature curve
Average high, lowDaylight
Hours between sunrise and sunset on the 15th of each monthiiiData table
Climate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 8° | 9° | 12° | 18° | 22° | 25° | 29° | 30° | 27° | 21° | 15° | 10° |
| Average low | -2° | -1° | 2° | 7° | 12° | 17° | 21° | 22° | 19° | 12° | 6° | 0° |
| Precipitation | 67 mm | 86 mm | 152 mm | 160 mm | 206 mm | 256 mm | 240 mm | 157 mm | 265 mm | 156 mm | 98 mm | 58 mm |
| Wet days (≥1 mm) | 8.8 | 8.3 | 10.8 | 12 | 13.3 | 16.5 | 21.7 | 20.8 | 18.3 | 12.5 | 8 | 9.3 |
| Cloud cover | 28% | 32% | 38% | 42% | 48% | 58% | 49% | 36% | 41% | 36% | 30% | 24% |
| Daylight | 10h 02 | 10h 54 | 11h 55 | 13h 03 | 14h 00 | 14h 31 | 14h 19 | 13h 31 | 12h 26 | 11h 21 | 10h 20 | 9h 48 |
| Month score | 37 | 38 | 42 | 66 | 61 | 54 | 44 | 42 | 54 | 68 | 67 | 36 |
ivMonth by month
Seto in every month
January37
8° / -2°
67 mm · 8.8 wet days
February38
9° / -1°
86 mm · 8.3 wet days
March42
12° / 2°
152 mm · 10.8 wet days
April66
18° / 7°
160 mm · 12 wet days
May61
22° / 12°
206 mm · 13.3 wet days
June54
25° / 17°
256 mm · 16.5 wet days
July44
29° / 21°
240 mm · 21.7 wet days
August42
30° / 22°
157 mm · 20.8 wet days
September54
27° / 19°
265 mm · 18.3 wet days
October68
21° / 12°
156 mm · 12.5 wet days
November67
15° / 6°
98 mm · 8 wet days
December36
10° / 0°
58 mm · 9.3 wet days