Surabaya Temperature by Month

Surabaya in East Java, Indonesia enjoys a stable climate, with daytime temperatures staying close to 33°C (91°F) throughout the year. Explore the full monthly breakdown below.

The temperature in Surabaya remains steady throughout the year, providing a consistently very warm climate. Maximum daytime temperatures range from a very warm 35°C (95°F) in October to a very warm 32°C (90°F) in February. Nights are mild year-round, with lows ranging from 26°C (79°F) in October to 24°C (75°F) in February.

The chart below illustrates the average maximum day and minimum night temperatures in Surabaya by month:

The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. October, the city's warmest month, gets 221 hours of sunshine.

The chart below shows the average temperature throughout the year:

Surabaya's average annual maximum temperature is 33°C (91°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Surabaya, February is the coolest month, with average highs of 32°C (90°F) and humidity around 68%, considered high. In October, the warmest month, temperatures average 35°C (95°F) with 56% humidity, conditions that feel moderate. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Surabaya's weather, including monthly rainfall, sunshine hours, and humidity, visit our Surabaya climate page.