Highest temperature in Paris on August 1?

Platform comparison

Market context

Paris is being judged on the day’s **highest reading at Paris–Le Bourget Airport**, so the market is really about whether the afternoon peak lands in the high 20s or pushes into 30 °C territory. The crowd is currently anchored on **28 °C**, with the Polymarket slate showing that outcome well ahead of 29 °C, while the market description itself points to official guidance and ensemble forecasts clustering around **28–29 °C** and putting **30 °C+** at only a very small chance. [2]

The historical frame is fairly straightforward: in a Paris August context, the market is usually sensitive to a one- or two-degree miss rather than a dramatic swing, because late-summer highs often sit near the mid-to-high 20s. That matters here because the present pricing is only modestly above climatology, which is consistent with a forecast that expects a warm but not extreme day; AccuWeather’s monthly Paris page likewise shows typical August values around the mid-20s rather than sustained heatwave levels. [1][11] Earlier June 2026 heat across France also reminds traders that the country has recently seen extreme temperatures, but those events do not automatically translate into an August 1 peak in Paris. [12][14]

The main catalyst to watch is the *latest forecast update* before the settlement window closes, especially any shift in cloud cover, marine influence or afternoon heating that could move the maximum by a degree either way. The current market note says increasing afternoon cloudiness is capping warming, which is why 28 °C is leading and 30 °C remains a low-probability tail; any fresh Météo-France or ensemble update that either deepens the cloud deck or clears it out would be the most direct driver of repricing. [2][8]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Paris on August 1? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. For users geo-blocked from Polymarket directly, brokers like Election Predictions UK provide a 0%-fee route into the same order book.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Election Predictions UK route into the same order book at 0% fees.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.