How many days will Phoenix be above 90°F?

Comparing prediction market odds to analyst forecasts reveals interesting insights into collective belief versus expert opinion. While analysts may offer projections based on climate models and historical data, this market represents the aggregated predictions of a diverse group of traders. If analysts widely predict a high probability of a heat wave, we might expect the ‘yes’ side of this market to trade at a higher price. However, discrepancies can arise due to factors not fully captured in traditional forecasts, such as unforeseen weather patterns or localized effects. It’s a dynamic comparison, constantly evolving as new information becomes available.

On Kalshi, this market is priced using a continuous double auction, meaning traders buy and sell contracts representing the potential outcomes. The price of a contract reflects the market's assessment of the probability of that outcome occurring. As more traders participate, the price adjusts to reflect the collective wisdom of the crowd. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. The current price indicates the cost to buy a contract that pays out if the average temperature in Phoenix exceeds 90°F for the specified duration during the week of September 7, 2026. Trading volume and order book depth also influence price movements.

This market resolves around Sep 15, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. Specifically, the average daily temperature in Phoenix for each day of the week of September 7, 2026, will be assessed. The number of consecutive days exceeding 90°F will be counted to determine whether the market resolves in favor of the ‘yes’ outcome (four or more consecutive days) or the ‘no’ outcome. The data used for this determination will be sourced from established meteorological agencies and publicly available weather records.

Several signals and events could significantly impact this market. Long-range weather forecasts released in the months leading up to September 2026 will be closely watched. Any indication of a developing high-pressure system or unusual atmospheric conditions could shift trader sentiment. Heat waves in other regions during the summer of 2026 might also influence perceptions of overall climate trends. Finally, unexpected developments in climate change research or policy could introduce new factors into the market's assessment of the likelihood of extreme heat in Phoenix.