Year-round weather and climate in Iruma, Japan
Average temperatures in Iruma run from an average low of 0°C32°F in January up to an average high of 33°C91°F in August. November is the driest month at 5 rainy days; August the wettest at 18 rainy days. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 147K
- Currency
- JPY
- Language
- Japanese
- Time zone
- Tokyo
Best time to visit
The most pleasant weather falls in September, October, and November, offering a perfect balance of comfortable temperatures and clear skies.
Rain character
Tropical Downpours: Expect intense bursts of rain during wetter months. Pack quick-drying footwear and a compact umbrella.
Day-to-night swing
Evening Chill: Temperatures drop by a noticeable <span class="val-c">10°C</span><span class="val-f">18°F</span> when the sun goes down. A light sweater or jacket is usually all you need for evening plans.
Seasonality Profile
Humid Subtropical: Sweltering, wet summers accompanied by mild, drier winters.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
Summer Heat Fatigue: Midday heat in July and August is intense. Pack high-SPF sunscreen and a wide-brimmed hat.
Average temperatures, sunshine, and rainfall
Average monthly weather in Iruma, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Nov is typically driest at 5 rainy days (61mm); Aug the wettest at 18 rainy days (170mm).
| Month | Average high | Average low | Daily sunshine | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 9°C / 49°F | 0°C / 32°F | 8h | 6 | 39mm |
| Feb | 11°C / 51°F | 1°C / 34°F | 8h | 6 | 45mm |
| Mar | 14°C / 58°F | 5°C / 40°F | 8h | 12 | 151mm |
| Apr | 20°C / 68°F | 10°C / 50°F | 8h | 11 | 109mm |
| May | 23°C / 73°F | 14°C / 56°F | 8h | 16 | 190mm |
| Jun | 27°C / 80°F | 19°C / 66°F | 8h | 13 | 226mm |
| Jul | 33°C / 91°F | 24°C / 75°F | 10h | 14 | 87mm |
| Aug | 33°C / 92°F | 25°C / 76°F | 11h | 18 | 170mm |
| Sep | 29°C / 85°F | 22°C / 71°F | 9h | 14 | 186mm |
| Oct | 22°C / 71°F | 15°C / 58°F | 7h | 10 | 116mm |
| Nov | 17°C / 62°F | 8°C / 46°F | 8h | 5 | 61mm |
| Dec | 12°C / 53°F | 2°C / 36°F | 8h | 5 | 26mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Iruma?
August is the sunniest month in Iruma, averaging 11 hours of sunshine a day. Pack sunglasses and high-SPF sunscreen.
What clothes should I pack for Iruma?
Your packing list depends entirely on when you travel. Temperatures in Iruma swing from an average low of 0°C32°F in January up to 33°C91°F in August. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for Iruma?
Iruma gets rain on about 130 days a year, with August being the wettest. If you're traveling then, pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in Iruma with Packola.
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