Jakarta Weather in September
Indonesia · Tropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Jakarta sees average temperatures ranging from a low of 23.5°C (74.3°F) to a high of 32.9°C (91.2°F), with a mean of 27.5°C (81.5°F). Compared to the annual average of 27.0°C (80.6°F), this month is 0.5°C warmer than the yearly norm. Precipitation averages 118.9mm, making it approximately 87.0mm drier than the monthly average of 206.0mm. The city receives an average of 10.9 hours of sunshine per day during September, with relative humidity averaging 75.6%. Wind speeds reach an average maximum of 13.9 km/h. For travelers, this month offers a temperature experience in Jakarta, with drier-than-average conditions compared to the rest of the year.
If you're planning outdoor activities in Jakarta, the wet season dictates everything. I tried running along the coast in January — 31°C, 85% humidity, and a thunderstorm hit at 3pm like clockwork. The data confirms: November-March brings 300mm monthly with afternoon storms. The dry season (June-September) is the only sane outdoor window: 31°C but humidity drops to 70% and rain halves. UV hits 11+ year-round between 10am-2pm — avoid direct sun. Flooding is a real risk January-February; check local conditions before any outdoor plan. Hydrate constantly; the equatorial heat sneaks up on you even on cloudy days.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 27.4°C (81.3°F) | 27.5°C (81.5°F) | 27.6°C (81.7°F) |
| Rainfall | 79.2mm | 118.9mm | 175.4mm |
| Sunshine | 11.3 hrs | 10.9 hrs | 10.3 hrs |
| Humidity | 74.9% | 75.6% | 77.8% |
| Wind | 14.5 km/h | 13.9 km/h | 13.2 km/h |
| Rainy Days | 20.8 | 23.8 | 27.6 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Jakarta in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Jakarta in September?
The average temperature in Jakarta during September ranges from 23.5°C (74.3°F) to 32.9°C (91.2°F), with a mean of 27.5°C (81.5°F).
How much does it rain in Jakarta in September?
Jakarta receives an average of 118.9mm of precipitation in September, spread across approximately 23.8 rainy days.
What should I pack for Jakarta in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 118.9mm of precipitation.
Is September a good time to visit Jakarta?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Jakarta
Cities with Similar September Climate (Tropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: -6.21°, 106.85°. Timezone: Asia/Jakarta. Last updated: 2026-07-30.