TOTAL VOLUME:
$134.2b
24H VOL:
$130,522,377
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,438,389,636
404,028
Markets across
30,214
events
MATCHED EVENTS:
2,681
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
$
The minimum temperature in San Francisco on May 31, 2026, will be recorded according to the National Weather Service's daily climatological data. This event covers the full range of possible temperature outcomes.
On Kalshi, prices reflect that venue's order book, liquidity, and how traders price the outcome right now. On Kalshi, the lowest temperature outcome for San Francisco on May 31 is priced as a set of binary or range-based contracts, each representing a specific temperature threshold or band. Traders buy or sell shares at prices between 0 and 100 cents, where the price reflects the implied probability of that outcome occurring. As traders place orders, the bid-ask spread tightens or widens based on volume and conviction. Kalshi's order book aggregates all buy and sell interest, allowing you to see real-time depth and execute at the best available price for your chosen temperature outcome.
Several factors can shift market odds for San Francisco's May 31 low temperature. Major weather pattern changes—such as shifts in the Pacific jet stream, development of high or low pressure systems, or El Niño/La Niña transitions—will influence long-range forecasts and trader positioning. Seasonal climate anomalies, historical temperature records for late May, and any unusual atmospheric circulation patterns can also move prices. As May approaches, updated 10-day and extended forecasts will become more precise, causing rapid repricing. Additionally, any significant climate or weather news affecting California's regional conditions may prompt traders to adjust their bets on the final outcome.