Portorož Arpt climate by month
Averages and records for each calendar month at Portorož Arpt, Slovenia, from 1987 to 2023. The warmest month is July, averaging 29.5°C; the coolest is January at 9.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 9.2°C | 1.2°C | 18.2°C19 January 2014 | −9.5°C26 January 2000 | 36 / 36 |
| February | 10.5°C | 1.4°C | 22.2°C22 February 1990 | −10.3°C7 February 1991 | 36 / 36 |
| March | 14.1°C | 3.9°C | 23.2°C30 March 2017 | −10.5°C2 March 2005 | 36 / 36 |
| April | 18.0°C | 7.5°C | 28.2°C19 April 2018 | −4.2°C8 April 2003 | 36 / 36 |
| May | 22.7°C | 11.7°C | 33.2°C29 May 2008 | 3.3°C5 May 2011 | 36 / 36 |
| June | 26.9°C | 15.5°C | 35.6°C26 June 2019 | 6.4°C1 June 2006 | 37 / 37 |
| July | 29.5°C | 17.4°C | 37.4°C22 July 2015 | 8.8°C5 July 2007 | 36 / 37 |
| August | 29.4°C | 17.2°C | 37.3°C8 August 2013 | 7.5°C8 August 2005 | 37 / 37 |
| September | 24.6°C | 13.7°C | 33.0°C12 September 2020 | 4.8°C29 September 2008 | 36 / 36 |
| October | 19.6°C | 10.2°C | 27.5°C14 October 2000 | −1.8°C25 October 2003 | 35 / 35 |
| November | 14.4°C | 6.3°C | 24.4°C1 November 2004 | −5.0°C22 November 1995 | 35 / 35 |
| December | 10.3°C | 2.5°C | 19.1°C1 December 2014 | −9.9°C20 December 2009 | 35 / 35 |
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 35 to 37 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.