The month in detail
What to expect in September
In September, Java sees 31°C during the day with 6.9h of sunshine per day. Rain risk remains low (25% of days), leaving good room for outdoor activities. Not the best window, but acceptable if dates are constrained. July (5.8/10) is significantly better if possible.
September ranks 3 out of 12 months in Java. Compared to August: 10 pts more rainy days, −0.8h of sun per day.
This month's conditions
What it's like in September
UV index
8 · very high
protection essential
Feels like
muggy at times
21°
Sea
24°C
pleasant for swimming
Daylight
12.0h of daylight
Air quality
good
AQI 29
Compare
Is September the right month?
The best month in Java is July (5.8/10), 0.3 pt higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · Java
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · Java
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Indonesia
🗣️LanguageIndonesian
💶CurrencyRoupie indonésienne (Rp)
🚗DrivingLeft-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘVery cheap · 1/5
🌡️ Climate
🌍Climate typeEquatorial tropical
📈Climate trend ⓘStable
🔥Hottest monthMay · 31°C
❄️Coolest monthJanuary · 30°C
🌧️Rainiest month ⓘFebruary · 69%
🏝️ Tropical stay
🌞Dry season ⓘMay → Sep
🌧️Wet season ⓘDec → Mar
🌀Cyclones ⓘNone (equator)
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Location
Where is Java ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
IndonesiaEquatorial tropical climate with a 5.8 → 4.5 gap between best and worst month. 10 years of ERA5 data to choose by project.
7.80°S · 110.36°E
Questions
Frequently asked questions
What is the best time to visit Java?
July is the best month with 30.0°C highs, 22.0°C lows, 7.7h of sunshine and 14.0% rainy days.
How many hours of sunshine does Java get in July?
Java averages 7.7 sunshine hours per day in July. It is the sunniest month with a climate score of 5.8/10.
What is the rainiest month in Java?
February is the most unfavourable month with February has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in Java in July?
In July, overnight lows reach 22.0°C, while afternoon highs average 30.0°C.
Is Java good in winter?
In winter (December-February), Java scores 4.4/10 on average — Difficult period — prefer the peak season.. The best month overall remains July with a score of 5.8/10.
When should you avoid Java?
February is the most difficult month to visit Java, with February has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Can you swim in Java in September?
In September, the sea averages 24°C in Java: pleasant for swimming. Swimming is pleasant without a wetsuit.
Do you need sun protection in Java in September?
The average UV index reaches 8 in September in Java (very high), with about 12.0h of daylight. Protection essential.