AI-generatedSurabaya at a glance
- Best time
- Jun – Sep
- Warmest month
- Sep · 33°
- Warmest sea
- Nov · 30.1°
- Sunshine a year
- 2,450 h
- Rain a year
- 1,752 mm
- Climate
- Tropical
- Time zone
- UTC+7
- Elevation
- 8 m
Climate in Surabaya
Surabaya has a tropical climate: it is warm all year round, and the seasons differ mainly in how much rain falls. September is the warmest month with average highs of 33 °C, while January is the coolest at 29 °C. With around 2,450 hours of sunshine a year, Surabaya is sunny; September is the sunniest month with 8.8 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Fair
Best time to visit: June – September
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 29°
- Midday, 13:00: about 33°
- Afternoon, 16:00: about 32°
- Evening, 20:00: about 28°
- Night, 23:00: about 27°
05:0717:22
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 04:54–05:35 · evening 16:54–17:35
- Blue hour
- Morning 04:46–04:54 · evening 17:35–17:43
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Surabaya in October?
In October, Surabaya is hot: daytime highs average 33 °C, and even at night it stays warm at around 25 °C. The sea averages 29.4 °C – almost as warm as a bath. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 87 mm in total. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is a so-so month for a holiday in Surabaya.
More details for October
- Daylight
- 12 h 15 min05:07 – 17:22
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 62 %on averageAll months
- Hot days
- 29 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Jakarta
How the score comes together
- Temperatureweight 50 %28 %
- Sunshineweight 20 %82 %
- Few rainy daysweight 30 %33 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Sea temperature in Surabaya
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 28.8 – 30.0 °C
Swimming season: All year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Surabaya ranges from 28.2 °C in August to 30.1 °C in November. At 20 °C and more, the sea is warm enough for swimming all year round.
The sea warms up slowly: it is warmest in November, while the air already peaks in September. The sea temperature varies from year to year: in November, eight out of ten years were between 29.6 and 30.5 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 29.4° | 28.8° | 30.1° | very warm |
| FebruaryFeb | 28.9° | 27.8° | 29.8° | warm |
| MarchMar | 29.4° | 28.5° | 30.0° | very warm |
| AprilApr | 30.0° | 29.4° | 30.7° | very warm |
| MayMay | 29.9° | 29.6° | 30.3° | very warm |
| JuneJun | 29.3° | 28.8° | 29.7° | very warm |
| JulyJul | 28.5° | 27.8° | 29.2° | warm |
| AugustAug | 28.2° | 27.5° | 28.9° | warm |
| SeptemberSep | 28.6° | 27.8° | 29.3° | warm |
| OctoberOct | 29.4° | 28.8° | 30.0° | very warm |
| NovemberNov | 30.1° | 29.6° | 30.5° | very warm |
| DecemberDec | 29.8° | 29.2° | 30.3° | very warm |
Sunshine hours in Surabaya
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.9 of 12.3 hours of daylight in Surabaya, 64 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Surabaya
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 14 · extremeAvoid the midday sun; SPF 50+, covering clothes, hat and sunglasses.
The sun is strongest in October (UV 14).
Minutes until sunburn in October
- Very fair skin
- about 10 min
- Fair skin
- about 10 min
- Light brown skin
- about 15 min
- Olive skin
- about 20 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Surabaya: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Surabaya has about 13 rainy days with 87 mm of rain in total.
Wind and clouds in Surabaya
How breezy and how cloudy Surabaya is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Surabaya typically peaks at 12 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 62 % of the sky over Surabaya: variable cloud, with about 7.9 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Surabaya
How often the day gets hot in Surabaya (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Surabaya has about 29 hot days, with an average daytime high of 33 °C: hot and muggy. Plan outdoor activities for the morning and evening, drink a lot and take breaks in the cool.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Surabaya
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Hot 24° and more
- muggy month (10+ muggy days)
HotOctober: nights around 25°. Hot nights: air conditioning makes sleeping much easier. Muggy on about 31 days (dew point 18 °C or more).
The coolest nights are in July (24°), the warmest in November (26°). Nights stay tropical all year (20 °C and more), so a room with air conditioning or at least a fan pays off. It is muggy (dew point 18 °C or more) on about 362 days a year, mostly all year round.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 41 | 29° | 25° | 29.4° | 4.8 h | 29 | 269 |
| FebruaryFeb | 41 | 29° | 25° | 28.9° | 4.8 h | 27 | 266 |
| MarchMar | 40 | 30° | 25° | 29.4° | 5.5 h | 29 | 266 |
| AprilApr | 41 | 30° | 25° | 30.0° | 6.2 h | 24 | 181 |
| MayMay | 48 | 31° | 25° | 29.9° | 7.0 h | 15 | 104 |
| JuneJun | 61 | 30° | 25° | 29.3° | 7.3 h | 10 | 52 |
| JulyJul | 73 | 31° | 24° | 28.5° | 8.1 h | 5 | 25 |
| AugustAug | 70 | 32° | 24° | 28.2° | 8.7 h | 2 | 10 |
| SeptemberSep | 62 | 33° | 25° | 28.6° | 8.8 h | 4 | 24 |
| OctoberOct | 40 | 33° | 25° | 29.4° | 7.9 h | 13 | 87 |
| NovemberNov | 34 | 31° | 26° | 30.1° | 6.4 h | 25 | 191 |
| DecemberDec | 38 | 30° | 25° | 29.8° | 4.9 h | 29 | 276 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
7.25° S, 112.75° E · 8 m · Asia/Jakarta
Best time to visit Surabaya
The best time to visit Surabaya is from June to September. For a beach holiday with the sea above 21 °C, go from June to September. Rain is most frequent from October to May; the wettest month is December with 276 mm.
Surabaya through the seasons
How the weather changes over the seasons, with averages for each.
Surabaya in the dry season
Jun – Sep
Good
- 30–33 °C by day
- Sea 29 °C
- 8 h of sun a day
- 21 rainy days in all
Surabaya in the rainy season
Oct – May
Fair
- 29–33 °C by day
- Sea 30 °C
- 6 h of sun a day
- 191 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Surabaya for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Surabaya
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Surabaya: score 73 against 40. In July, days are 2 °C cooler than in October. The sea is 1 °C cooler in July. July has 8 fewer rainy days.
| Month | October | July |
|---|---|---|
| Weather score | 40 | 73better |
| Day high | 33° | 31° |
| Night low | 25° | 24° |
| Sea | 29.4° | 28.5° |
| Sunshine | 7.9 h | 8.1 h |
| Rainy days | 13 | 5better |
| Rainfall | 87 mm | 25 mmbetter |
| Muggy days | 31 | 31 |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Jun – Sep
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Rainy months
Oct – May
12 or more rainy days
Surabaya month by month
The typical weather for every month at a glance.
41January29° · Sea 29° · 5 h
In January, Surabaya is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 29.4 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 269 mm. On about 10 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, January is a so-so month for a holiday in Surabaya.
Surabaya in January41February29° · Sea 29° · 5 h
In February, Surabaya is hot: daytime highs average 29 °C, and even at night it stays warm at around 25 °C. The sea averages 28.9 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 27 days, totalling 266 mm. On about 7 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, February is a so-so month for a holiday in Surabaya.
Surabaya in February40March30° · Sea 29° · 6 h
In March, Surabaya is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.4 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 266 mm. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, March is a so-so month for a holiday in Surabaya.
Surabaya in March41April30° · Sea 30° · 6 h
In April, Surabaya is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 30.0 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 24 days, totalling 181 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, April is a so-so month for a holiday in Surabaya.
Surabaya in April48May31° · Sea 30° · 7 h
In May, Surabaya is hot: daytime highs average 31 °C, and even at night it stays warm at around 25 °C. The sea averages 29.9 °C – almost as warm as a bath. The sun shines for around 7 hours a day. It is the rainy season: rain falls on about 15 days, totalling 104 mm. On about 24 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is a so-so month for a holiday in Surabaya.
Surabaya in May61June30° · Sea 29° · 7 h
In June, Surabaya is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.3 °C – almost as warm as a bath. The sun shines for around 7 hours a day. Rain is frequent, with about 10 rainy days and 52 mm in total. On about 21 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is a good month for a holiday in Surabaya.
Surabaya in June73July31° · Sea 29° · 8 h
In July, Surabaya is hot: daytime highs average 31 °C, and even at night it stays warm at around 24 °C. The sea averages 28.5 °C – lovely and warm for swimming. The sun shines for around 8 hours a day. Rain is rare: about 5 days bring 25 mm in total. On about 25 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a good month for a holiday in Surabaya.
Surabaya in July70August32° · Sea 28° · 9 h
In August, Surabaya is hot: daytime highs average 32 °C, and even at night it stays warm at around 24 °C. The sea averages 28.2 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is rare: about 2 days bring 10 mm in total. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is a good month for a holiday in Surabaya.
Surabaya in August62September33° · Sea 29° · 9 h
In September, Surabaya is hot: daytime highs average 33 °C, and even at night it stays warm at around 25 °C. The sea averages 28.6 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is rare: about 4 days bring 24 mm in total. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a good month for a holiday in Surabaya.
Surabaya in September40October33° · Sea 29° · 8 h
In October, Surabaya is hot: daytime highs average 33 °C, and even at night it stays warm at around 25 °C. The sea averages 29.4 °C – almost as warm as a bath. The sun shines for around 8 hours a day. Rain is frequent, with about 13 rainy days and 87 mm in total. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is a so-so month for a holiday in Surabaya.
Surabaya in October34November31° · Sea 30° · 6 h
In November, Surabaya is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °C. The sea averages 30.1 °C – almost as warm as a bath. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 25 days, totalling 191 mm. On about 22 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, November is not an ideal month for a holiday in Surabaya.
Surabaya in November38December30° · Sea 30° · 5 h
In December, Surabaya is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.8 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 276 mm. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is not an ideal month for a holiday in Surabaya.
Surabaya in DecemberSurabaya compared
Put Surabaya side by side with another destination.
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Surabaya vs. Yogyakarta
In October Yogyakarta has the better holiday weather (score 54 vs. 40). During the day Yogyakarta is 3 °C cooler than Surabaya. Yogyakarta gets one hour less sunshine a day.
| in October | Surabaya | Yogyakarta |
|---|---|---|
| Holiday score | 40 | 54 |
| Daytime high | 33° | 30° |
| Sea | 29° | – |
| Sunshine | 8 h | 7 h |
| Rainy days | 13 | 14 |
| Best time | Jun – Sep | Jun – Sep |
Through the year
Indonesia in October: the best places
In October, Surabaya ranks 14 of 16 destinations in this country.
- Komodo Island29°28°99
- 2Senggigi31°29°88
- 3Kuta28°27°81
- 4Denpasar27°27°71
- 5Nusantara30°29°67
- 6Labuan Bajo29°29°65
- 7Ubud29°60
- 8Yogyakarta30°54
- 14SurabayaThis page33°29°40
Planning a trip to Surabaya
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Surabaya in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Surabaya has its best school-holiday weather during the summer holidays (score 71) and its weakest during October half-term (score 40).
- 41
Easter holidays
Mar – Apr
Fair
- 30 °C by day
- Sea 30 °C
- 6.0 h of sun a day
- 25 rainy days a month
Keep in mind: Frequent rain
- 51
May half-term
May – Jun
Fair
- 30 °C by day
- Sea 30 °C
- 7.1 h of sun a day
- 14 rainy days a month
Keep in mind: Frequent rain
- 71
Summer holidays
Jul – Aug
GoodBest holidays
- 31 °C by day
- Sea 28 °C
- 8.5 h of sun a day
- 3 rainy days a month
Good for: Beach & swimming
- 40
October half-term
Oct
Fair
- 33 °C by day
- Sea 29 °C
- 7.9 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain
- 40
Christmas holidays
Dec – Jan
Fair
- 30 °C by day
- Sea 30 °C
- 4.9 h of sun a day
- 29 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 15 h 15 min
- Distance
- 12,230 km
- Time zone
- UTC+7
- Jet lag
- About 6 days (6 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Surabaya
When is the best time to visit Surabaya?
The best time to visit Surabaya is from June to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Surabaya?
The sea temperature in Surabaya ranges from 28.2 °C in August to 30.1 °C in November. At 20 °C and more, the sea is warm enough for swimming all year round.
Can you swim in Surabaya in October?
Yes. In October the sea averages 29.4 °C – almost as warm as a bath.
What is the warmest month in Surabaya?
September is the warmest month, with average highs of 33 °C and nights around 25 °C. January is the coolest month at 29 °C.
When does it rain most in Surabaya?
Rain is most frequent from October to May; the wettest month is December with 276 mm. The driest month is August with 10 mm.
How many hours of sunshine does Surabaya get?
Surabaya gets around 2,450 hours of sunshine a year. The sunniest month is September with 8.8 hours a day; in January there are 4.8 hours a day.
What time zone is Surabaya in?
Surabaya uses the time zone Asia/Jakarta, at UTC+7 all year.
How long is the flight from London to Surabaya?
A nonstop flight from London to Surabaya takes about 15 h 15 min, for a straight-line distance of about 12,230 km. Most routes need a change of planes, which adds time.
Which school holidays are best for Surabaya?
Surabaya has its best school-holiday weather during the summer holidays (score 71) and its weakest during October half-term (score 40). Holiday ratings (0–100): Easter holidays 41, May half-term 51, Summer holidays 71, October half-term 40, Christmas holidays 40.
Near Surabaya
Other destinations close by.
Places with a climate like Surabaya
Destinations whose weather through the year is closest to Surabaya's – good alternatives.