Iruma weather
Best months for weather: Apr–May, Aug, Nov. Below: today's sky, the hour-by-hour rain chance and the 16-day forecast for Iruma, Saitama, Japan.
Best Time to Visit
Peak season Apr–May, Aug, NovOff season Dec–Mar
Iruma weather by month
When is the best time to visit Iruma?
Based on weather alone, the best time to visit Iruma is Apr–May, Aug, Nov, according to NASA's 2001–2025 climate averages. Dec–Mar tends to be the least pleasant. Average highs run from 6°C (42°F) in January to 30°C (86°F) in August.
What is the rainiest month in Iruma?
September is the wettest month, with about 201 mm (7.9 in) of rain on average. February is the driest, with about 48 mm (1.9 in).
What is the hottest month in Iruma?
August is the warmest, with average highs of 30°C (86°F) and lows of 21°C (70°F). January is the coolest, with highs of 6°C (42°F) and lows of -4°C (26°F).
Does Iruma have a rainy season?
Yes. Jun–Oct is the rainy season (150 mm or more a month), while Dec–Feb is usually dry (under 60 mm).
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), forecast and current conditions from Open-Meteo. Page updated . How we rate months