Kosai weather
At 12:00 PM local time it was partly cloudy and 21°C (70°F). Light rain for 3 of the next 24 hours (under 1 mm/h, 1.2 mm total) — cloudy, but fine to be out. Best months for weather: Aug, Nov. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Kosai, Shizuoka, Japan.
Current conditions
- Clouds
- 54%
- Chance of rain
- 0%
- Rain
- 0.0 mm/h
Hourly Forecast
Light rain for 3 of the next 24 hours (under 1 mm/h, 1.2 mm total) — cloudy, but fine to be out
Daily Forecast
Best Time to Visit
Peak season Aug, NovOff season Jun–Jul, Sep–Oct, Jan–Apr
About Kosai weather
Is it raining in Kosai right now?
No. It’s partly cloudy and 21° right now. Light rain for 3 of the next 24 hours (under 1 mm/h, 1.2 mm total) — cloudy, but fine to be out.
What’s the weather like in Kosai this week?
Over the next 7 days, expect highs of 16–22° and lows of 8–15°. Rain is likely on 3 of 7 days (Monday, Wednesday, Thursday). The driest day looks like Sunday.
Has it been raining in Kosai lately?
In the past 7 days, Kosai had 3 rainy days and 90.8 mm of rain in total.
What should I pack for Kosai?
For the coming week, bring an umbrella or rain jacket and a warm layer for the evenings.
Kosai weather by month
When is the best time to visit Kosai?
Based on weather alone, the best time to visit Kosai is Aug, Nov, according to NASA's 2001–2025 climate averages. Jun–Jul, Sep–Oct, Jan–Apr tends to be the least pleasant. Average highs run from 11°C (51°F) in January to 28°C (83°F) in August.
What is the rainiest month in Kosai?
September is the wettest month, with about 242 mm (9.5 in) of rain on average. January is the driest, with about 73 mm (2.9 in).
What is the hottest month in Kosai?
August is the warmest, with average highs of 28°C (83°F) and lows of 26°C (79°F). January is the coolest, with highs of 11°C (51°F) and lows of 7°C (45°F).
How warm is the sea in Kosai?
The sea is warmest in August at about 27°C (80°F) and coolest in February at about 15°C (59°F). It is comfortable for swimming (22°C or more) in Jun–Oct.
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine, forecast and current conditions from Open-Meteo. Page updated . How we rate months