Highest temperature in Paris on August 9?

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Market context

The immediate change in the last 24–48 hours is that Paris has shifted from a broadly warm early-August pattern to a more heat-prone setup, with forecast highs around 30°C or a little above and some guidance pointing to a sunnier, hotter Sunday. Recent forecasts also leave room for showers or cloud at times, which matters because the market settles on the *highest* temperature actually observed at Paris-Le Bourget Airport, not the broader day-high summary. [12][9][1]

The 1% crowd-implied probability of a very high outcome looks consistent with the seasonally normal August profile in Paris, where typical daytime maxima are well below heatwave levels, even though this summer has already produced repeated hot spells in France. Paris has seen several days in the mid-30s Celsius during the 2026 heatwave pattern, including readings above 36°C earlier in the month, so the relevant comparison is not average August weather but whether a short-lived spike can develop at the station before the settlement cut-off. [11][3][8]

What traders should watch now is the evolution of the local forecast through the morning and early afternoon, especially any last-minute increase in sunshine, a stronger than expected southerly flow, or reduced cloud cover over Île-de-France. Temperature risk is also sensitive to timing: the market settles at 12:00 UTC, so the warmest part of the day may matter less than the morning ramp-up if peaks occur later. Paris forecast services currently lean toward highs in the low 30s Celsius, which supports only a small tail risk of a much hotter print. [9][12][6]

Sources: 1 · 2 · 3 · 4 · 5

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