Surabaya weather in July
In July, Surabaya sees average daytime highs of 31°C and overnight lows near 25°C, with 22 mm of rain across 4.5 wet days and about 11.6 hours of daylight. It is the 10th-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 50% of the time in July, and the air most often feels oppressive.
Daylight stretches from about 11 h 36 min at the start of July to 11 h 42 min by month's end. Set against the rest of the year, July is Surabaya's 2nd-clearest and 4th-windiest month. For the whole year in context, see Surabaya's year-round climate.
- Daytime high
- 31°
- 10th warmest
- Overnight low
- 25°
- 2nd coldest
- Rainfall
- 22 mm
- 4.5 wet days
- Daylight
- 11 h 36 min
- 5:46 AM – 5:23 PM
- Cloud cover
- 45%
- 2nd clearest
- Wind
- 8 km/h
- 4th windiest
- Solar energy
- 5.48 kWh/m²
- Travel score
- 5.2
- out of 10
Surabaya is city in East Java Province, Indonesia.
- Density
- 8,598/km²
- people per km²
- Founded
- 1293
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in July
Day-to-day highs hold fairly steady near 31°C through the month.
A typical July day in Surabaya reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 32°C. Set against its neighbours, July runs on par with June and on par with August.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 31 | 25 |
| 2 | 31 | 25 |
| 3 | 31 | 25 |
| 4 | 31 | 25 |
| 5 | 31 | 25 |
| 6 | 31 | 25 |
| 7 | 31 | 25 |
| 8 | 31 | 25 |
| 9 | 31 | 25 |
| 10 | 31 | 25 |
| 11 | 31 | 25 |
| 12 | 31 | 25 |
| 13 | 31 | 25 |
| 14 | 31 | 25 |
| 15 | 31 | 25 |
| 16 | 31 | 25 |
| 17 | 31 | 25 |
| 18 | 31 | 25 |
| 19 | 31 | 25 |
| 20 | 31 | 25 |
| 21 | 31 | 25 |
| 22 | 31 | 25 |
| 23 | 31 | 25 |
| 24 | 31 | 25 |
| 25 | 31 | 25 |
| 26 | 31 | 25 |
| 27 | 31 | 25 |
| 28 | 31 | 25 |
| 29 | 31 | 25 |
| 30 | 31 | 25 |
| 31 | 31 | 25 |
How July really feels in Surabaya
Once humidity and wind are folded in, July averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in July is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Surabaya weather by month
How July compares with the rest of the year at a glance. July is the 10th-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 25° | 280 | 29.4 | 12.4 | 2.4 |
| Feb | 31° / 25° | 261 | 27.1 | 12.2 | 2.4 |
| Mar | 31° / 26° | 268 | 28.9 | 12 | 2.4 |
| Apr | 32° / 26° | 186 | 24 | 11.8 | 2.8 |
| May | 32° / 26° | 86 | 14.6 | 11.7 | 3.7 |
| Jun | 31° / 26° | 49 | 9 | 11.6 | 4.5 |
| Jul | 31° / 25° | 22 | 4.5 | 11.6 | 5.2 |
| Aug | 31° / 25° | 6 | 1.5 | 11.8 | 5.3 |
| Sep | 32° / 25° | 20 | 3.3 | 12 | 4.5 |
| Oct | 33° / 26° | 73 | 12.5 | 12.2 | 3.3 |
| Nov | 32° / 26° | 179 | 24.2 | 12.3 | 2.5 |
| Dec | 31° / 26° | 274 | 28.7 | 12.4 | 2.4 |
Cloud cover in July
The sky is clear or mostly clear about 50% of the time in July.
Beyond those clear spells, partly cloudy skies cover about 18% of July, with mostly cloudy or overcast conditions the remaining 33%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 66 | 66 | 64 | 64 | 64 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 66 | 66 | 67 | 67 | 68 | 68 | 69 | 70 | 70 | 70 | 71 | 71 | 71 | 71 | 71 | 72 | 72 | 72 |
| Cloudier (%) | 34 | 34 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 34 | 34 | 33 | 33 | 32 | 32 | 31 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 66 | 34 |
| 2 | 66 | 34 |
| 3 | 64 | 36 |
| 4 | 64 | 36 |
| 5 | 64 | 36 |
| 6 | 63 | 37 |
| 7 | 63 | 37 |
| 8 | 63 | 37 |
| 9 | 63 | 37 |
| 10 | 64 | 36 |
| 11 | 64 | 36 |
| 12 | 64 | 36 |
| 13 | 65 | 35 |
| 14 | 66 | 34 |
| 15 | 66 | 34 |
| 16 | 67 | 33 |
| 17 | 67 | 33 |
| 18 | 68 | 32 |
| 19 | 68 | 32 |
| 20 | 69 | 31 |
| 21 | 70 | 30 |
| 22 | 70 | 30 |
| 23 | 70 | 30 |
| 24 | 71 | 29 |
| 25 | 71 | 29 |
| 26 | 71 | 29 |
| 27 | 71 | 29 |
| 28 | 71 | 29 |
| 29 | 72 | 28 |
| 30 | 72 | 28 |
| 31 | 72 | 28 |
Chance of precipitation in July
Surabaya gets around 22 mm of rain over 4.5 wet days in July. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 14% and peaks near 19% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 14 | 14 | 13 | 12 | 11 | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 |
| Rain chance (%) | |
|---|---|
| 1 | 19 |
| 2 | 19 |
| 3 | 19 |
| 4 | 19 |
| 5 | 19 |
| 6 | 19 |
| 7 | 19 |
| 8 | 19 |
| 9 | 19 |
| 10 | 19 |
| 11 | 18 |
| 12 | 18 |
| 13 | 17 |
| 14 | 17 |
| 15 | 16 |
| 16 | 16 |
| 17 | 15 |
| 18 | 14 |
| 19 | 14 |
| 20 | 13 |
| 21 | 12 |
| 22 | 11 |
| 23 | 10 |
| 24 | 10 |
| 25 | 9 |
| 26 | 8 |
| 27 | 8 |
| 28 | 7 |
| 29 | 7 |
| 30 | 6 |
| 31 | 6 |
Humidity in July
Most of July feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, July lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Muggy (%) | 22 | 23 | 23 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 28 | 29 | 30 | 30 | 31 | 32 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| Oppressive (%) | 59 | 59 | 59 | 59 | 59 | 60 | 59 | 59 | 60 | 60 | 59 | 60 | 60 | 61 | 62 | 62 | 62 | 62 | 62 | 60 | 60 | 60 | 60 | 59 | 58 | 57 | 57 | 56 | 55 | 55 | 54 |
| Miserable (%) | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 5 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 1 | 22 | 59 | 18 |
| 2 | 1 | 23 | 59 | 17 |
| 3 | 1 | 23 | 59 | 17 |
| 4 | 1 | 24 | 59 | 16 |
| 5 | 1 | 24 | 59 | 16 |
| 6 | 1 | 24 | 60 | 15 |
| 7 | 1 | 25 | 59 | 15 |
| 8 | 1 | 25 | 59 | 15 |
| 9 | 1 | 25 | 60 | 14 |
| 10 | 1 | 25 | 60 | 14 |
| 11 | 1 | 26 | 59 | 14 |
| 12 | 1 | 26 | 60 | 13 |
| 13 | 1 | 26 | 60 | 13 |
| 14 | 0 | 26 | 61 | 13 |
| 15 | 0 | 26 | 62 | 12 |
| 16 | 0 | 26 | 62 | 12 |
| 17 | 0 | 27 | 62 | 11 |
| 18 | 0 | 27 | 62 | 11 |
| 19 | 0 | 28 | 62 | 10 |
| 20 | 1 | 29 | 60 | 10 |
| 21 | 1 | 30 | 60 | 9 |
| 22 | 1 | 30 | 60 | 9 |
| 23 | 1 | 31 | 60 | 8 |
| 24 | 1 | 32 | 59 | 8 |
| 25 | 1 | 34 | 58 | 7 |
| 26 | 1 | 35 | 57 | 7 |
| 27 | 1 | 36 | 57 | 6 |
| 28 | 1 | 37 | 56 | 6 |
| 29 | 1 | 38 | 55 | 6 |
| 30 | 1 | 39 | 55 | 5 |
| 31 | 1 | 40 | 54 | 5 |
Wind in July
Winds average 8 km/h in July.
Across July, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 8 | calm |
| 6 | 8 | calm |
| 7 | 8 | calm |
| 8 | 8 | calm |
| 9 | 8 | calm |
| 10 | 8 | calm |
| 11 | 8 | calm |
| 12 | 8 | calm |
| 13 | 8 | calm |
| 14 | 8 | calm |
| 15 | 8 | calm |
| 16 | 8 | calm |
| 17 | 8 | calm |
| 18 | 8 | calm |
| 19 | 8 | calm |
| 20 | 8 | calm |
| 21 | 8 | calm |
| 22 | 8 | calm |
| 23 | 8 | calm |
| 24 | 8 | calm |
| 25 | 8 | calm |
| 26 | 8 | calm |
| 27 | 8 | calm |
| 28 | 8 | calm |
| 29 | 8 | calm |
| 30 | 8 | calm |
| 31 | 8 | calm |
Sunrise & sunset in July
Daylight runs from about 11 h 36 min at the start of July to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 6 minutes over July. Sunrise moves from 5:45 AM to 5:45 AM, and sunset from 5:20 PM to 5:25 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 | 11.7 |
| Sunrise (AM) | 5:45 | 5:45 | 5:45 | 5:45 | 5:45 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:45 | 5:45 | 5:45 | 5:45 | 5:45 |
| Sunset (PM) | 5:20 | 5:20 | 5:20 | 5:21 | 5:21 | 5:21 | 5:21 | 5:21 | 5:22 | 5:22 | 5:22 | 5:22 | 5:22 | 5:23 | 5:23 | 5:23 | 5:23 | 5:23 | 5:24 | 5:24 | 5:24 | 5:24 | 5:24 | 5:24 | 5:25 | 5:25 | 5:25 | 5:25 | 5:25 | 5:25 | 5:25 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 5:45 | 5:20 |
| 2 | 11.6 | 5:45 | 5:20 |
| 3 | 11.6 | 5:45 | 5:20 |
| 4 | 11.6 | 5:45 | 5:21 |
| 5 | 11.6 | 5:45 | 5:21 |
| 6 | 11.6 | 5:46 | 5:21 |
| 7 | 11.6 | 5:46 | 5:21 |
| 8 | 11.6 | 5:46 | 5:21 |
| 9 | 11.6 | 5:46 | 5:22 |
| 10 | 11.6 | 5:46 | 5:22 |
| 11 | 11.6 | 5:46 | 5:22 |
| 12 | 11.6 | 5:46 | 5:22 |
| 13 | 11.6 | 5:46 | 5:22 |
| 14 | 11.6 | 5:46 | 5:23 |
| 15 | 11.6 | 5:46 | 5:23 |
| 16 | 11.6 | 5:46 | 5:23 |
| 17 | 11.6 | 5:46 | 5:23 |
| 18 | 11.6 | 5:46 | 5:23 |
| 19 | 11.6 | 5:46 | 5:24 |
| 20 | 11.6 | 5:46 | 5:24 |
| 21 | 11.6 | 5:46 | 5:24 |
| 22 | 11.6 | 5:46 | 5:24 |
| 23 | 11.6 | 5:46 | 5:24 |
| 24 | 11.6 | 5:46 | 5:24 |
| 25 | 11.6 | 5:46 | 5:25 |
| 26 | 11.7 | 5:46 | 5:25 |
| 27 | 11.7 | 5:45 | 5:25 |
| 28 | 11.7 | 5:45 | 5:25 |
| 29 | 11.7 | 5:45 | 5:25 |
| 30 | 11.7 | 5:45 | 5:25 |
| 31 | 11.7 | 5:45 | 5:25 |
Solar energy in July
Average shortwave solar energy reaching the ground each day in July, about 5.48 kWh/m².
For context, solar energy here swings from a low near 5.01 kWh/m² to a high of 6.73 kWh/m² in September across the year — July's 5.48 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 | 5.7 | 5.8 | 5.8 | 5.8 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.3 | Bright |
| 2 | 5.3 | Bright |
| 3 | 5.3 | Bright |
| 4 | 5.3 | Bright |
| 5 | 5.3 | Bright |
| 6 | 5.3 | Bright |
| 7 | 5.3 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.3 | Bright |
| 11 | 5.4 | Bright |
| 12 | 5.4 | Bright |
| 13 | 5.4 | Bright |
| 14 | 5.4 | Bright |
| 15 | 5.4 | Bright |
| 16 | 5.5 | Bright |
| 17 | 5.5 | Bright |
| 18 | 5.5 | Bright |
| 19 | 5.5 | Bright |
| 20 | 5.5 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.6 | Bright |
| 23 | 5.6 | Bright |
| 24 | 5.6 | Bright |
| 25 | 5.7 | Bright |
| 26 | 5.7 | Bright |
| 27 | 5.7 | Bright |
| 28 | 5.7 | Bright |
| 29 | 5.8 | Bright |
| 30 | 5.8 | Bright |
| 31 | 5.8 | Bright |
Hazard calendar for Surabaya
None of Surabaya's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Surabaya sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Surabaya's monsoon runs November–April, when most of the year's rain falls.
Is July a good time to visit Surabaya?
Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
July is a reasonable time to visit Surabaya for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Surabaya in July
From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In July, Surabaya sees daytime highs around 31°C and nights near 25°C. Pack light clothes. Worth having: sun protection. About 5 days see rain.
Sea temperature near Surabaya in July
The nearest coast averages about 28°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 20 km away) is warmest in November at about 30°C and coldest in August near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 29 | 29 | 30 | 30 | 29 | 28 | 28 | 28 | 29 | 30 | 30 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Tropical |
| Oct | 29 | Tropical |
| Nov | 30 | Tropical |
| Dec | 30 | Tropical |
UV index in Surabaya in July
Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Surabaya peaks around March 17 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 at about 8 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 10 | 11 | 14 | 11 | 9 | 7 | 9 | 11 | 13 | 11 | 10 | 11 |
| Level | Very high | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 11 | Extreme |
| Mar | 14 | Extreme |
| Apr | 11 | Extreme |
| May | 9 | Very high |
| Jun | 7 | Very high |
| Jul | 9 | Very high |
| Aug | 11 | Extreme |
| Sep | 13 | Extreme |
| Oct | 11 | Extreme |
| Nov | 10 | Extreme |
| Dec | 11 | Extreme |
Air quality in Surabaya in July
Average fine-particle pollution (PM2.5) through the year — so you can see where July falls, not just the annual average.
Air quality in Surabaya is worst in May — around 101 µg/m³ PM2.5 (unhealthy), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 76 | 71 | 87 | 99 | 101 | 95 | 81 | 66 | 69 | 80 | 87 | 81 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 76 | Unhealthy |
| Feb | 71 | Unhealthy |
| Mar | 87 | Unhealthy |
| Apr | 99 | Unhealthy |
| May | 101 | Unhealthy |
| Jun | 95 | Unhealthy |
| Jul | 81 | Unhealthy |
| Aug | 66 | Unhealthy |
| Sep | 69 | Unhealthy |
| Oct | 80 | Unhealthy |
| Nov | 87 | Unhealthy |
| Dec | 81 | Unhealthy |
Where is Surabaya?
Surabaya sits at 7.2°S, 112.8°E, 8 m above sea level, in Indonesia. The nearest listed city is Kamal, 10 km away.
Topography around Surabaya
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Surabaya.
Within 3 km, the terrain around Surabaya has only modest variations in elevation — a maximum elevation change of 19 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 115 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,306 m.
The land around Surabaya is covered by artificial surfaces (95%) within 3 km, artificial surfaces (36%) and water (34%) within 16 km, and water (41%), trees (26%) and cropland (22%) within 80 km.
Indonesia travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,060
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 30%
- of population, 2024
- Homicide rate
- 0.3
- per 100k, 2022
- Road deaths
- 11.3
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 471
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Surabaya (-7.2492°, 112.7508°, elevation 8 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).