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Surabaya, Indonesia climate
Aw Tropical savanna (dry winter)
Surabaya has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is October with an average daily high near 95°F, while the coldest is July averaging around 74°F at night. Precipitation totals about 39 inches a year and is strongly seasonal — January alone averages 7.7 inches while August barely receives 0.12 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Surabaya climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 90 | 91 | 91 | 91 | 91 | 90 | 91 | 93 | 95 | 94 | 91 |
| Avg temp (°F) | 83 | 83 | 84 | 84 | 84 | 83 | 82 | 83 | 84 | 86 | 86 | 84 |
| Avg low (°F) | 76 | 76 | 77 | 77 | 77 | 76 | 74 | 74 | 75 | 77 | 78 | 77 |
| Precipitation (in) | 7.7 | 7.1 | 7.5 | 3.0 | 1.5 | 1.2 | 0.6 | 0.1 | 0.3 | 1.1 | 2.7 | 6.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 90 | 91 | 91 | 91 | 91 |
| Avg temp (°F) | 83 | 83 | 84 | 84 | 84 | 83 |
| Avg low (°F) | 76 | 76 | 77 | 77 | 77 | 76 |
| Precipitation (in) | 7.7 | 7.1 | 7.5 | 3.0 | 1.5 | 1.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 91 | 93 | 95 | 94 | 91 |
| Avg temp (°F) | 82 | 83 | 84 | 86 | 86 | 84 |
| Avg low (°F) | 74 | 74 | 75 | 77 | 78 | 77 |
| Precipitation (in) | 0.6 | 0.1 | 0.3 | 1.1 | 2.7 | 6.5 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 86 | 86 | 79 | 72 | 55 | 49 | 43 | 38 | 38 | 56 | 75 | 86 |
| Relative humidity (%) | 85 | 87 | 85 | 83 | 80 | 77 | 71 | 65 | 61 | 64 | 73 | 82 |
| Wind speed (mph) | 7.3 | 7.2 | 5.3 | 4.9 | 5.9 | 6.6 | 7.5 | 7.9 | 7.5 | 6.2 | 4.9 | 5.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 86 | 86 | 79 | 72 | 55 | 49 |
| Relative humidity (%) | 85 | 87 | 85 | 83 | 80 | 77 |
| Wind speed (mph) | 7.3 | 7.2 | 5.3 | 4.9 | 5.9 | 6.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 43 | 38 | 38 | 56 | 75 | 86 |
| Relative humidity (%) | 71 | 65 | 61 | 64 | 73 | 82 |
| Wind speed (mph) | 7.5 | 7.9 | 7.5 | 6.2 | 4.9 | 5.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 23 years of daily observations at Surabaya/perak, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.