Surabaya / Perak climate by month
Averages and records for each calendar month at Surabaya / Perak, Indonesia, from 1979 to 2025. The warmest month is October, averaging 34.9°C; the coolest is January at 32.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 32.2°C | 24.5°C | 35.6°C15 January 2016 | 21.0°C24 January 1981 | 14 / 40 |
| February | 32.4°C | – | 38.5°C10 February 1995 | 20.4°C18 February 1999 | 12 / 39 |
| March | 32.5°C | 24.4°C | 38.7°C21 March 1994 | 20.4°C19 March 2007 | 17 / 38 |
| April | 33.1°C | 25.1°C | 39.0°C22 April 2007 | 20.4°C1 April 1999 | 17 / 37 |
| May | 33.1°C | 25.1°C | 36.7°C25 May 2016 | 20.0°C20 May 1980 | 17 / 38 |
| June | 32.7°C | 24.2°C | 35.2°C10 June 2016 | 20.0°C22 June 1979 | 15 / 42 |
| July | 32.6°C | 23.3°C | 35.6°C4 July 2016 | 19.6°C27 July 1994 | 17 / 40 |
| August | 32.9°C | 22.9°C | 37.0°C8 August 1981 | 16.8°C8 August 2003 | 13 / 39 |
| September | 34.0°C | 23.7°C | 36.5°C23 September 2020 | 20.2°C4 September 2006 | 13 / 40 |
| October | 34.9°C | 25.0°C | 37.8°C29 October 2002 | 20.0°C20 October 1980 | 14 / 41 |
| November | 34.6°C | 25.5°C | 38.0°C15 November 2004 | 21.0°C3 November 1979 | 16 / 41 |
| December | 32.8°C | 24.4°C | 37.6°C8 December 2019 | 22.0°C2 December 2005 | 19 / 38 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 12 to 19 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.