Live Weather & Forecast
Weather in Kosai
Shizuoka, Japan · Real-time conditions & 3-day outlook
16°C
Feels like 16°C
60°F / Feels 60°F
Light rain
Kosai, Shizuoka
🌞 Daytime
Updated: 2026-04-15 17:00
Humidity
88%
Wind
13 km/h ENE
Wind Gust
17.2 km/h
Pressure
1009 mb
Visibility
9 km
UV Index
0
(Low)
Precipitation
1.95 mm
Cloud Cover
100%
Dew Point
13.7°C
Wind Degree
65°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
190.9 μg/m³
NO₂
8.1 μg/m³
O₃
101 μg/m³
SO₂
2.8 μg/m³
PM 2.5
11.6 μg/m³
PM 10
17 μg/m³
Today's Hourly Forecast
24-hour breakdown for Kosai, Shizuoka
12 AM
17°
Patchy rain nearby
1 AM
17°
Patchy rain nearby
2 AM
17°
Overcast
3 AM
17°
Patchy rain nearby
4 AM
17°
Patchy rain nearby
5 AM
17°
Light drizzle
6 AM
16°
Patchy rain nearby
7 AM
17°
Patchy rain nearby
8 AM
17°
Overcast
9 AM
17°
Overcast
10 AM
18°
Overcast
11 AM
18°
Patchy rain nearby
12 PM
18°
Cloudy
1 PM
18°
Cloudy
2 PM
18°
Overcast
3 PM
18°
Light drizzle
4 PM
16°
Moderate rain
5 PM
16°
Light rain
6 PM
16°
Light rain
7 PM
15°
Light rain
8 PM
15°
Light rain
9 PM
15°
Light drizzle
10 PM
15°
Light rain
11 PM
15°
Patchy rain nearby
3-Day Forecast
Daily overview for Kosai, Shizuoka
Today
Moderate rain
18°
/
15°
🌧️ 94% chance of rain
💧 Avg. humidity: 79%
💨 Max wind: 19.4 km/h
🌧️ Total precip: 12.88 mm
☀️ UV Index: 0.3
🌅 Sunrise: 05:19 AM
🌇 Sunset: 06:22 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Partly Cloudy
24°
/
15°
🌧️ 0% chance of rain
💧 Avg. humidity: 66%
💨 Max wind: 24.1 km/h
🌧️ Total precip: 0.03 mm
☀️ UV Index: 2
🌅 Sunrise: 05:18 AM
🌇 Sunset: 06:22 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Cloudy
17°
/
14°
🌧️ 0% chance of rain
💧 Avg. humidity: 66%
💨 Max wind: 14 km/h
🌧️ Total precip: 0.04 mm
☀️ UV Index: 1.6
🌅 Sunrise: 05:17 AM
🌇 Sunset: 06:23 PM
🌙 New Moon
🌑 Moon: 0% lit
Best Time to Visit Kosai
Plan your trip to Kosai, Japan around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in Kosai?
Current conditions in Kosai: Light rain, temperature 16°C, humidity 88%.
What is the best time to visit Kosai?
The best time to visit Kosai is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Kosai?
Kosai is located at approximately 34.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Kosai?
The wettest period in Kosai is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Kosai?
For visits to Kosai during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What are the public holidays in Kosai in 2026?
View the 2026 public holidays for Kosai on our Holidays page.
What are the GPS coordinates used for the weather forecast in Kosai?
The weather forecast for Kosai uses coordinates 34.7105, 137.5316.