Question 1

Which months are the wettest and driest in Jakarta?

Accepted Answer

In 2025, January was the wettest month in Jakarta with 407.6 mm (16.0 in) of rainfall, while July was the driest at just 136.6 mm (5.4 in). This contrast reflects Jakarta's classic tropical monsoon climate, which swings between a wet season and a drier mid-year stretch rather than between hot and cold seasons.

Jakarta's wet season peaks from December to March. Across these months in 2025, rainfall averaged 294.3 mm per month, with January (407.6 mm / 16.0 in), March (283.0 mm / 11.1 in), and February (265.2 mm / 10.4 in) leading the totals. Humidity also ran high during this period, reaching 84-85%.

The drier stretch runs from June through September. These four months averaged just 149.6 mm of rain and together delivered 598.6 mm (23.6 in) — only about a quarter of Jakarta's substantial 2,659.4 mm (104.7 in) annual total for 2025. Humidity eased to roughly 76-78% over the same window, making the air feel less oppressive.

Temperatures barely change across the year, holding between 26.5°C and 27.7°C (79.7-81.9°F) every month, so the calendar in Jakarta is defined by rain rather than warmth.

For visitors, the June-to-September dry season is the most comfortable time to explore Jakarta, with fewer heavy downpours and lower humidity. If you travel during the December-to-March peak, plan for frequent afternoon showers and keep an umbrella handy throughout your stay.

Question 2

How much does the temperature vary throughout the year in Jakarta?

Accepted Answer

Jakarta has remarkably little temperature variation throughout the year, with monthly average temperatures staying within just 1.2°C (2.2°F) across all of 2025. As a near-equatorial city, Jakarta enjoys a steady tropical climate rather than distinct hot and cold seasons.

Across 2025, Jakarta's annual mean temperature was 27.2°C (80.9°F). The coolest month on average was January at 26.5°C (79.7°F), while the warmest was October at 27.7°C (81.9°F) — a difference of only about one degree. Average daily highs held steady at 34.2°C (93.7°F), and average daily lows sat at 22.8°C (73.1°F) year-round.

While the monthly averages barely move, individual days do push higher. The hottest readings of 2025 came in August, peaking at 35.9°C (96.6°F), while the lowest temperature dipped to 22.4°C (72.3°F) in October. Humidity stayed consistently high throughout the year, averaging 80.7%, which can make the heat in Jakarta feel more intense than the thermometer suggests.

For visitors, this means Jakarta is warm and humid no matter when you travel — there is no "cool season" to plan around. Lightweight, breathable clothing works all year, and the steady warmth makes any month suitable for sightseeing. The bigger seasonal difference in Jakarta is rainfall rather than temperature, so timing a trip is more about avoiding the wettest months than chasing cooler weather.

Question 3

How humid is Jakarta throughout the year in 2025?

Accepted Answer

Jakarta is consistently humid all year round, averaging **80.7% relative humidity** across 2025 with only modest month-to-month change. As a tropical lowland city, Jakarta stays muggy even in its "drier" months, so high humidity is a defining feature of its climate rather than a seasonal exception.

Humidity peaked during the wet season, reaching **85.0% in February 2025**, the most humid month of the year. The drier mid-year stretch brought the lowest readings, with **September 2025 the least humid at 76.5%**. Across the full year the gap between the most and least humid months was only about **8.5 percentage points**, underlining how stable Jakarta's moisture levels remain.

Grouping the months shows the pattern clearly:

- **Wettest period (January–April plus December):** around 83.3% average humidity
- **Driest period (July–September):** around 76.9% average humidity
- **Annual average:** 80.7%

This persistent moisture combines with steady warmth — Jakarta averaged **27.2°C (80.9°F)** in 2025, with daily highs averaging **34.2°C (93.7°F)** — to make the air feel hotter and stickier than the thermometer alone suggests.

For visitors and residents, this means Jakarta rarely offers truly "dry" relief, though July through September are noticeably more comfortable for outdoor activity. Lightweight, breathable clothing and good hydration are practical year-round, and the slightly lower humidity of the mid-year months makes them the most pleasant time for sightseeing in Jakarta.

Question 4

What was the hottest day in Jakarta in 2025?

Accepted Answer

The hottest day in Jakarta in 2025 was **August 27**, when the temperature peaked at **35.9°C (96.6°F)**. This single-day high stood out in a year that was otherwise defined by remarkably steady tropical warmth rather than dramatic heat spikes.

Across the full 2025 calendar year, Jakarta averaged a daily high of **31.4°C (88.5°F)** and a daily low of **24.1°C (75.3°F)**, giving an annual mean temperature of **27.2°C (80.9°F)**. The hottest readings clustered in the dry months: four of the five warmest days fell in August, September, and October, including September 3 at 35.6°C (96.1°F) and October 16 at 35.3°C (95.5°F).

Genuinely hot days were the exception in Jakarta during 2025. Only **4 days** reached 35°C (95°F) or higher, while **23 days** hit at least 34°C (93.2°F). For most of the year, afternoon highs stayed in the low 30s Celsius (upper 80s Fahrenheit), reflecting the city's consistent equatorial climate.

For visitors, this means Jakarta rarely experiences extreme heat, but the combination of high temperatures and the city's well-known humidity can make late-August through October afternoons feel hotter than the numbers suggest. Planning outdoor activities for the morning hours and staying hydrated is the practical way to stay comfortable during Jakarta's warmest stretch of the year.

Question 5

What is the sunniest time of year in Jakarta?

Accepted Answer

The sunniest time of year in Jakarta falls during the dry season from June to September, with **July 2025** being the single sunniest month at 288.6 hours of sunshine — an average of 9.3 hours of sun per day.

Across the full 2025 calendar year, Jakarta recorded 3,096 hours of sunshine, averaging about 258 hours per month. The dry-season stretch was clearly the brightest: the meteorological summer (June to August 2025) delivered 813.6 hours of sunshine, roughly 8.8 hours each day. September followed closely with 273.7 hours (9.1 hours/day), and October reached 274 hours. This sunny spell lined up with much lower rainfall — July saw just 136.6 mm (5.4 in) of rain, compared to a soggy 407.6 mm (16.0 in) in January.

At the other end, January 2025 was the cloudiest month in Jakarta, with only 226 hours of sunshine (7.3 hours/day) during the peak of the wet season. Temperatures stayed remarkably steady all year, hovering around 27°C (81°F), so the main seasonal difference travelers feel is sunshine and rain rather than heat.

For planning a visit, the months from June through September offer Jakarta's best combination of long sunny days and reduced downpours, making them ideal for sightseeing, outdoor markets, and day trips. If you want the brightest skies, target July, when Jakarta enjoyed its highest sunshine totals of 2025.

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FAQ

Which months are the wettest and driest in Jakarta?

How much does the temperature vary throughout the year in Jakarta?

How humid is Jakarta throughout the year in 2025?

What was the hottest day in Jakarta in 2025?

What is the sunniest time of year in Jakarta?