Surabaya is rarely comfortable to be outside at midday. It comes closest in early February, and even then it is too hot. For sun, aim for mid July to August.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
For sun, go from mid July to August. It peaks in late August, at 63. Avoid November for this: it falls to 10, mostly because it is too hot. The clearest skies come in August, when the sky is typically 36% covered at midday (partly cloudy).
Being outside is not what Surabaya is for: the Easy outdoors rating tops out at 3, mostly because it is too hot.
Walking is not what Surabaya is for: the Active outdoors rating tops out at 0, mostly because it is too warm.
The year, measured
The average temperature in Surabaya over the whole year is 28°C. October is the hottest month, with highs of about 33°C; July is the coldest, with lows of about 25°C. The rainy (wet) season in Surabaya runs from October to May, peaking in February with a 71% chance of rain on a given day. The dry season is September; September is the driest month, at 40%. Winds in Surabaya are highest in August, averaging 3.0 m/s (11 km/h), and lightest in April, at 2.0 m/s (7 km/h). The prevailing wind is from the E. The clearest skies in Surabaya come in August, when the sky is typically 36% covered; February is the cloudiest month, at 67%.
Month by month Surabaya climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°C | 26°C | 35°C | 69% | 67% | 2.4 m/s | 1 | 26 | 0 |
| February | 31°C | 26°C | 34°C | 71% | 67% | 2.6 m/s | 1 | 31 | 0 |
| March | 31°C | 26°C | 35°C | 67% | 63% | 2.1 m/s | 0 | 21 | 0 |
| April | 31°C | 26°C | 36°C | 71% | 56% | 2.0 m/s | 0 | 16 | 0 |
| May | 31°C | 26°C | 35°C | 64% | 48% | 2.4 m/s | 0 | 23 | 0 |
| June | 31°C | 26°C | 34°C | 51% | 45% | 2.4 m/s | 0 | 35 | 0 |
| July | 31°C | 25°C | 33°C | 58% | 39% | 2.7 m/s | 2 | 58 | 0 |
| August | 31°C | 25°C | 33°C | 58% | 36% | 3.0 m/s | 2 | 61 | 0 |
| September | 32°C | 25°C | 34°C | 40% | 38% | 3.0 m/s | 1 | 44 | 0 |
| October | 33°C | 26°C | 35°C | 61% | 45% | 2.6 m/s | 0 | 22 | 0 |
| November | 32°C | 26°C | 36°C | 71% | 59% | 2.1 m/s | 0 | 13 | 0 |
| December | 31°C | 26°C | 35°C | 71% | 65% | 2.2 m/s | 0 | 21 | 0 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Surabaya weather by season
Year round, Surabaya has days of about 31°C at their warmest in February, its coolest month, and 33°C in October, its warmest; the coolest hours of the day run from 25°C to 26°C through the year, and the average temperature over the year is 28°C around the clock. Rain is most likely around February and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Surabaya weather in winterJune to August
Winter in Surabaya has typical daily highs of about 31°C and lows of about 25°C, with a 56% chance of rain on a given day.
Surabaya weather in springSeptember to November
Spring in Surabaya has typical daily highs of about 32°C and lows of about 26°C, with a 58% chance of rain on a given day.
Surabaya weather in summerDecember to February
Summer in Surabaya has typical daily highs of about 31°C and lows of about 26°C, with a 70% chance of rain on a given day.
Surabaya weather in autumnMarch to May
Autumn in Surabaya has typical daily highs of about 31°C and lows of about 26°C, with a 67% chance of rain on a given day.
When is the rainy season in Surabaya?
The rainy (wet) season in Surabaya runs from October to May, peaking in February with a 71% chance of rain on a given day. The dry season is September; September is the driest month, at 40%.
What time of year is Surabaya windiest?
Winds in Surabaya are highest in August, averaging 3.0 m/s (11 km/h), and lightest in April, at 2.0 m/s (7 km/h). The prevailing wind is from the E.
What is the average temperature in Surabaya year round?
The average temperature in Surabaya over the whole year is 28°C. October is the hottest month, with highs of about 33°C; July is the coldest, with lows of about 25°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.