Live Weather & Forecast
Weather in Iiyama
Nagano, Japan · Real-time conditions & 3-day outlook
10°C
Feels like 9°C
49°F / Feels 47°F
Mist
Iiyama, Nagano
🌞 Daytime
Updated: 2026-04-16 05:45
Humidity
94%
Wind
8.6 km/h N
Wind Gust
9.9 km/h
Pressure
1013 mb
Visibility
2 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
59%
Dew Point
8.8°C
Wind Degree
10°
Air Quality Index
US EPA: Moderate
UK DEFRA: Low (2)
CO
293.9 μg/m³
NO₂
15.4 μg/m³
O₃
90 μg/m³
SO₂
8 μg/m³
PM 2.5
18.2 μg/m³
PM 10
23.4 μg/m³
Today's Hourly Forecast
24-hour breakdown for Iiyama, Nagano
12 AM
11°
Light drizzle
1 AM
11°
Light drizzle
2 AM
11°
Patchy rain nearby
3 AM
11°
Patchy rain nearby
4 AM
11°
Patchy rain nearby
5 AM
10°
Mist
6 AM
9°
Cloudy
7 AM
10°
Patchy rain nearby
8 AM
11°
Sunny
9 AM
12°
Sunny
10 AM
14°
Sunny
11 AM
15°
Sunny
12 PM
16°
Sunny
1 PM
16°
Sunny
2 PM
16°
Sunny
3 PM
16°
Sunny
4 PM
15°
Sunny
5 PM
14°
Sunny
6 PM
11°
Sunny
7 PM
8°
Clear
8 PM
7°
Clear
9 PM
6°
Clear
10 PM
5°
Clear
11 PM
5°
Clear
3-Day Forecast
Daily overview for Iiyama, Nagano
Today
Patchy rain nearby
16°
/
5°
🌧️ 97% chance of rain
💧 Avg. humidity: 68%
💨 Max wind: 14.8 km/h
🌧️ Total precip: 0.95 mm
☀️ UV Index: 1.8
🌅 Sunrise: 05:13 AM
🌇 Sunset: 06:22 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Overcast
21°
/
3°
🌧️ 0% chance of rain
💧 Avg. humidity: 49%
💨 Max wind: 9 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.9
🌅 Sunrise: 05:12 AM
🌇 Sunset: 06:23 PM
🌙 New Moon
🌑 Moon: 0% lit
Sat, Apr 18
Partly Cloudy
20°
/
6°
🌧️ 0% chance of rain
💧 Avg. humidity: 59%
💨 Max wind: 7.6 km/h
🌧️ Total precip: 0.1 mm
☀️ UV Index: 2
🌅 Sunrise: 05:10 AM
🌇 Sunset: 06:24 PM
🌙 Waxing Crescent
🌑 Moon: 1% lit
Best Time to Visit Iiyama
Plan your trip to Iiyama, 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 Iiyama?
Current conditions in Iiyama: Mist, temperature 10°C, humidity 94%.
What is the best time to visit Iiyama?
The best time to visit Iiyama is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Iiyama?
Iiyama is located at approximately 36.9° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Iiyama?
The wettest period in Iiyama is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Iiyama?
For visits to Iiyama during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What are the public holidays in Iiyama in 2026?
View the 2026 public holidays for Iiyama on our Holidays page.
What are the GPS coordinates used for the weather forecast in Iiyama?
The weather forecast for Iiyama uses coordinates 36.8518, 138.3654.