How many days will San Diego be above 90°F?

Comparing prediction market odds to analyst forecasts reveals how collective intelligence stacks up against expert opinion. Currently, there's significant interest in whether San Diego will experience an extended period of high temperatures. While traditional weather forecasts provide probabilities based on models, this market reflects what traders believe will *actually* happen, incorporating a wider range of information and potential unforeseen circumstances. Discrepancies between the two can highlight areas where the market anticipates factors not fully captured by standard analytical approaches.

On Kalshi, this market is priced using a continuous double auction, meaning traders buy and sell contracts representing potential outcomes. The price of a contract reflects the probability of that outcome occurring, as perceived by the market participants. On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. As more traders participate and new information becomes available, the prices adjust dynamically. The market's depth – the number of contracts available at different price points – indicates the level of confidence and agreement among traders regarding the likelihood of a prolonged heat wave in San Diego.

This market resolves around Sep 29, 2026, with the outcome confirmed once the event is verifiable from credible public reporting. Specifically, the resolution will be based on the average daily temperature recorded in San Diego during the week of September 21, 2026. If the average temperature exceeds 90°F for a consecutive number of days as defined by the market contract, the corresponding outcome will be settled as 'yes'; otherwise, it will settle as 'no'. The data used will be sourced from established meteorological agencies.

Several factors could significantly influence this market before its resolution. Long-range weather forecasts released in the months leading up to September 2026 will be closely watched. Any indications of a developing El Niño or La Niña pattern, known to affect California's weather, could drive trading activity. Unexpected changes in global climate patterns or unusual atmospheric conditions could also shift expectations. Furthermore, reports on water reservoir levels and drought conditions in Southern California might impact traders’ assessments of the potential for a heat wave.