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Seiyo

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Seiyo Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Seiyo year round climate

  • Spring (March–May): 11.4–19.4°C on average, mild and rainy, occasional overcast and rainy weather. Common activities: Spring outings, flower viewing (depending on blooming conditions). Recommended clothing: Light jacket, long-sleeved shirts and pants.
  • Summer (June–August): 22.9–28.2°C on average, hot and humid, relatively high rainfall. Common activities: Summer resorts, stream activities, mountain trail hiking (note sun protection and rain gear). Recommended clothing: Breathable and sweat-wicking clothing, rain gear.
  • Autumn (September–November): 19.9–26.3°C on average, comfortable and pleasant climate, rainfall gradually decreasing. Common activities: Maple leaf viewing (depending on leaf color change), outdoor activities. Recommended clothing: Light jacket, long-sleeved shirts and pants.
  • Winter (December–February): 6.3–8.2°C on average, cold and dry climate, low rainfall. Common activities: Hot spring bathing, indoor activities. Recommended clothing: Warm jacket, sweater, scarf and gloves.

Seiyo climatological average

Annual average temperature: approx. 17.4°C / Annual rainfall: approx. 2639 mm / Summer humidity: 75%–85% / Rainiest month: June

Seiyo monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
6.3°C
52.1
February
7.6°C
105.8
March
11.4°C
191.6
April
16.5°C
244.9
May
19.4°C
300.6
June
22.9°C
397.3
July
27.6°C
280.1
August
28.2°C
276.6
September
26.3°C
349.2
October
19.9°C
217.7
November
15°C
166.7
December
8.2°C
56.9

Seiyo weather for the next seven days

12/16
Tuesday
Sunny
12.9°C/2.9°C
12/17
Wednesday
Sunny
14.2°C/5.1°C
12/18
Thursday
Sunny
13.6°C/6°C
12/19
Friday
Sunny
15.6°C/6.5°C
12/20
Saturday
Patchy rain nearby
17.3°C/9°C
12/21
Sunday
Moderate rain
16.1°C/10.8°C
12/22
Monday
Patchy rain nearby
14.4°C/10.4°C

Seiyo Frequently Asked Questions and Useful Information for Travel

Best time to go to Seyo?

The best time to visit Seiyo is spring and autumn, when the weather is mild and suitable for viewing red foliage and flower viewing.

A must-visit attraction in Seyo?

Must-visit attractions in Seiyo include Yawatahama Port, Uno Town in Seiyo City, Kisaiya Hiroba in Uwajima City, and Uwajima Castle.