| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 32.4° | 24.7° | — | — | 72 |
| February | 32.5° | 24.1° | — | — | 72 |
| March | 32.9° | 24.5° | — | — | 70 |
| April | 33.4° | 25.1° | — | — | 68 |
| May | 33.2° | 25.1° | — | — | 69 |
| June | 33° | 24.2° | — | — | 70 |
| July | 32.8° | 23.2° | — | — | 71 |
| August | 33.1° | 23° | — | — | 70 |
| September | 34.2° | 23.8° | 0mm | 0 | 71 |
| October | 35° | 25° | 0mm | 0 | 68 |
| November | 34.6° | 25.5° | 146.6mm | 8 | 54 |
| December | 32.9° | 24.4° | — | — | 70 |
January in Surabaya averages a daily high of 32.4°C with nights around 24.7°C. Generally workable, with some weather to plan around.
February in Surabaya averages a daily high of 32.5°C with nights around 24.1°C. Generally workable, with some weather to plan around.
March in Surabaya averages a daily high of 32.9°C with nights around 24.5°C. Generally workable, with some weather to plan around.
April in Surabaya averages a daily high of 33.4°C with nights around 25.1°C. Generally workable, with some weather to plan around.
May in Surabaya averages a daily high of 33.2°C with nights around 25.1°C. Generally workable, with some weather to plan around.
June in Surabaya averages a daily high of 33°C with nights around 24.2°C. Generally workable, with some weather to plan around.
July in Surabaya averages a daily high of 32.8°C with nights around 23.2°C. Generally workable, with some weather to plan around.
August in Surabaya averages a daily high of 33.1°C with nights around 23°C. Generally workable, with some weather to plan around.
September in Surabaya averages a daily high of 34.2°C with nights around 23.8°C. Rain is rare — about 0 wet days and 0mm across the month. Generally workable, with some weather to plan around.
October in Surabaya averages a daily high of 35°C with nights around 25°C. Rain is rare — about 0 wet days and 0mm across the month. Generally workable, with some weather to plan around.
November in Surabaya averages a daily high of 34.6°C with nights around 25.5°C. Expect roughly 8 wet days totalling 146.6mm. Demanding conditions — pack for it and plan indoor options.
December in Surabaya averages a daily high of 32.9°C with nights around 24.4°C. Generally workable, with some weather to plan around.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Surabaya peaks at 72.
Based on 30 years of records, December–October scores highest for comfort in Surabaya, balancing daytime temperature against rainfall.
October is the warmest, averaging a daily high of 35°C.
November is the wettest, averaging 146.6mm of rain across roughly 8 wet days.
January is the coolest month, with average daily highs around 32.4°C.