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Gunung Ijen

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Gunung Ijen Weather and climate

Data source：Meteostat
Update date：2025-09

Gunung Ijen year round climate
  • Spring (March to May): Average 27.3–27.8°C, warm and humid climate. March has the most rainfall; bring rain gear. Common activities: Hiking, viewing volcanic landscapes (note safety precautions). Recommended clothing: Light and breathable clothing, raincoat, sun protection clothing.
  • Summer (June to August): Average 26.0–27.0°C, relatively dry climate with less rainfall, but be aware of afternoon showers. Common activities: Hiking, photography, viewing blue flames. Recommended clothing: Light and breathable clothing, sun protection clothing, rain gear.
  • Autumn (September to November): Average 26.8–28.1°C, warm and humid climate, moderate rainfall. Common activities: Hiking, viewing volcanic landscapes. Recommended clothing: Light and breathable clothing, rain gear.
  • Winter (December to February): Average 27.3–27.9°C, warm and humid climate, moderate rainfall. Common activities: Hiking, photography, viewing volcanic landscapes. Recommended clothing: Light and breathable clothing, rain gear.
Gunung Ijen climatological average

Annual average temperature: approx. 27.3°C / Annual rainfall: approx. 1529 mm / Summer humidity: 70%–80% / Rainiest month: March

Gunung Ijen monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
27.6°C
233.3
February
27.3°C
233
March
27.6°C
264.7
April
27.8°C
92
May
27.8°C
24
June
27°C
75.3
July
26°C
100.3
August
26.2°C
20
September
26.8°C
32
October
27.5°C
182.3
November
28.1°C
135.3
December
27.9°C
137
Gunung Ijen weather for the next seven days
10/17
Friday
Patchy rain nearby
32.7°C/19.9°C
10/18
Saturday
Patchy rain nearby
33.2°C/20.4°C
10/19
Sunday
Patchy rain nearby
32°C/19.9°C
10/20
Monday
Patchy rain nearby
32.2°C/20.1°C
10/21
Tuesday
Moderate rain
32.2°C/20.5°C
10/22
Wednesday
Patchy rain nearby
31.9°C/20.1°C
10/23
Thursday
Patchy rain nearby
31.3°C/19.7°C

Gunung Ijen FAQ

Is Mount Ijen difficult to climb?
The Ijen hike is generally considered moderate, but can be challenging due to its length, steepness, and rocky, uneven terrain, especially at night. Hikers face about 3.5 km (2.2 miles) and 600 meters (1,981 ft) of elevation gain to the crater rim, with a further steep and slippery descent into the crater to see the blue fire. A decent level of fitness and sturdy hiking shoes are essential, and some hikers may find the night conditions and sulphur fumes particularly strenuous. The trail to the crater rim is about 3.5 km with ~600m (1,981 ft) of elevation gain, with a further steep descent to the blue fire. The path is rocky, uneven, and often slippery, especially the path into the crater. Hiking in the dark requires navigating the trail carefully and is a significant challenge.
Is the Ijen Blue Fire real?
The "blue flame" phenomenon in the Ijen Crater is a mesmerizing and rare natural occurrence. It is caused by the combustion of sulfuric gases released from the volcano's vents, which ignite and burn with a striking blue hue. This natural spectacle is a significant draw for visitors to the Ijen volcano.
Is it safe to visit Ijen Crater?
Visiting Ijen Crater involves health and safety risks. The gases emanating from the crater can be nauseating and are toxic, so it is important not to breathe in too much of the sulfurous fumes. Visitors should take precautions, such as wearing protective masks, especially when descending into the crater. Following safety guidelines and listening to local guides is crucial for a safe experience.
When is Mount Ijen closed in 2025?
Mount Ijen Crater will be closed to visitors on the first Friday of each month throughout 2025. These closure dates include: January 3, February 7, March 7, April 4, May 2, June 6, July 4, August 1, September 5, October 3, November 7, and December 5.
What should I pack for Gunung Ijen?
For your trip to Gunung Ijen in 2025, pack layers of warm clothing as temperatures can be cold, especially at night. Sturdy hiking shoes with good grip are essential for the uneven terrain. Bring a headlamp or flashlight for the dark hike, a mask to protect against sulfur fumes, and a water bottle. A camera to capture the stunning views and blue fire is also recommended.