As I am a weather and climate statistics freak, knowing nearly by heart the history of weather records in Warsaw and having written 14 winter timelines here, each weather event which modifies weather stats for Warsaw should not pass unnoticed on PES.
With a delay, I note the maximum temperature record for July was broken on 3 July 2025, when temperature peaked at +36.5C, beating the reading of +35.9C dated 31 July 1994.
Last Sunday, on 21 September 2025 day-time high in Warsaw reached +30.8C. It was the first incidence of heat (defined as maximum temperature in excess of +30C) in the third decade of September ever. Moreover, the latest heat record, until last Sunday set on 14 September 1951 was broken by 7 days. Those are stats for Warsaw stand-alone. Country-wide, the latest incidence of heat was reported on 27 September 2012 (Jarczew, +30.8C, in most Polish cities temperature on that day reached above +26C).
The record Warsaw will be difficult to be beaten quickly, as such inflows of hot air are infrequent (we had it on 1 January 2023 when temperature peaked at +18.9C). Lucky us, it haunted us in the second half of September, not in mid-July as in high summer temperature would be likely to get close to +40C.
A matter of short time will probably be a first incidence of heat in October in Poland. So far the record is +29.3C measured on 3 October 2023 in Legnica.
Warmth spells in months other than summer ones are welcome, but they are a part of a broader picture whose element is a drought ongoing for a decade. Deficiency of rainfall has lasted two months now and forecasts for October, full of sunshine and no consensus about above-average temperatures, give little hope for making up for it.
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