National Weather Service forecasts and real-time observations indicate San Francisco’s daytime maximum on May 17 will reach or exceed the 68°F climatological normal at San Francisco International Airport, driving the near-certain market consensus on the 68°F-or-higher outcome. A warming synoptic pattern with reduced marine-layer influence and light onshore flow supports this elevated reading, consistent with typical May conditions under neutral ENSO influence. The strong implied probability reflects traders’ confidence in official model consensus, yet a sudden strengthening of the marine layer or unexpected wind shift could still cap the high slightly below threshold before evening cooling sets in.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in San Francisco on May 17?
68°F or higher 100.0%
64-65°F <1%
66-67°F <1%
$26,113 Vol.
$26,113 Vol.
64-65°F
<1%
66-67°F
<1%
68°F or higher
100%
68°F or higher 100.0%
64-65°F <1%
66-67°F <1%
$26,113 Vol.
$26,113 Vol.
64-65°F
<1%
66-67°F
<1%
68°F or higher
100%
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the San Francisco International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: May 15, 2026, 12:05 AM ET
Resolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOThe resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the San Francisco International Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFO.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve to "Yes" until all data for this date has been finalized.
The resolution source for this market measures temperatures to whole degrees Fahrenheit (eg, 21°F). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFONational Weather Service forecasts and real-time observations indicate San Francisco’s daytime maximum on May 17 will reach or exceed the 68°F climatological normal at San Francisco International Airport, driving the near-certain market consensus on the 68°F-or-higher outcome. A warming synoptic pattern with reduced marine-layer influence and light onshore flow supports this elevated reading, consistent with typical May conditions under neutral ENSO influence. The strong implied probability reflects traders’ confidence in official model consensus, yet a sudden strengthening of the marine layer or unexpected wind shift could still cap the high slightly below threshold before evening cooling sets in.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated


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