Year-round weather and climate in Iwamizawa, Japan
Average temperatures in Iwamizawa run from an average low of -10°C14°F in January up to an average high of 28°C82°F in August. May is the driest month at 10 rainy days; December the wettest at 23 rainy days. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 85K
- Currency
- JPY
- Language
- Japanese
- Time zone
- Tokyo
Best time to visit
The most pleasant weather falls in May, June, and July, 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
True Four Seasons: Dramatic contrasts. Freezing winters, transitional shoulders, and blazing summers.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
All-Day Strolling: Weather is generally forgiving for long walking days. Comfortable sneakers are your most important packing item.
Average temperatures, sunshine, and rainfall
Average monthly weather in Iwamizawa, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. May is typically driest at 10 rainy days (89mm); Dec the wettest at 23 rainy days (128mm).
| Month | Average high | Average low | Daily sunshine | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | -2°C / 28°F | -10°C / 14°F | 6h | 19 | 83mm |
| Feb | -1°C / 30°F | -9°C / 16°F | 7h | 17 | 67mm |
| Mar | 4°C / 40°F | -6°C / 22°F | 8h | 14 | 79mm |
| Apr | 13°C / 56°F | 4°C / 38°F | 8h | 13 | 113mm |
| May | 18°C / 64°F | 8°C / 46°F | 10h | 10 | 89mm |
| Jun | 23°C / 73°F | 14°C / 57°F | 10h | 13 | 126mm |
| Jul | 27°C / 81°F | 19°C / 67°F | 10h | 16 | 179mm |
| Aug | 28°C / 82°F | 21°C / 69°F | 9h | 19 | 218mm |
| Sep | 24°C / 74°F | 15°C / 59°F | 9h | 13 | 179mm |
| Oct | 16°C / 61°F | 7°C / 45°F | 8h | 15 | 137mm |
| Nov | 9°C / 48°F | 1°C / 33°F | 6h | 18 | 144mm |
| Dec | 0°C / 32°F | -6°C / 20°F | 5h | 23 | 128mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Iwamizawa?
July is the sunniest month in Iwamizawa, averaging 10 hours of sunshine a day. Pack sunglasses and high-SPF sunscreen.
What clothes should I pack for Iwamizawa?
Your packing list depends entirely on when you travel. Temperatures in Iwamizawa swing from an average low of -10°C14°F in January up to 28°C82°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 Iwamizawa?
Iwamizawa gets rain on about 190 days a year, with December 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 Iwamizawa with Packola.
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