The narrow gap between the 64-65°F (34.5%) and 66-67°F (33.0%) brackets reflects ensemble model runs from the National Weather Service placing the official KSFO high near 65°F on July 18, with modest uncertainty in marine-layer depth and afternoon clearing timing. Persistent onshore flow from the cool California Current sustains a shallow marine inversion that caps daytime heating, while any temporary weakening of the layer or brief offshore wind component could allow modest warming into the upper 60s. Historical July climatology at the airport shows average highs near 66°F, and recent NWS guidance through mid-July has favored similar mild conditions absent a strong thermal trough or wind shift.
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 July 18?
Highest temperature in San Francisco on July 18?
70-71°F 100.0%
55°F or below <1%
56-57°F <1%
58-59°F <1%
$52,115 Vol.
$52,115 Vol.
Jul 18, 2026
55°F or below
No
56-57°F
No
58-59°F
No
60-61°F
No
62-63°F
No
64-65°F
No
66-67°F
No
68-69°F
No
70-71°F
Yes
72-73°F
No
74°F or higher
No
70-71°F 100.0%
55°F or below <1%
56-57°F <1%
58-59°F <1%
$52,115 Vol.
$52,115 Vol.
Jul 18, 2026
55°F or below
$5,334 Vol.
No
56-57°F
$2,586 Vol.
No
58-59°F
$1,855 Vol.
No
60-61°F
$2,477 Vol.
No
62-63°F
$7,418 Vol.
No
64-65°F
$4,482 Vol.
No
66-67°F
$4,252 Vol.
No
68-69°F
$4,587 Vol.
No
70-71°F
$5,416 Vol.
Yes
72-73°F
$5,260 Vol.
No
74°F or higher
$8,448 Vol.
No
This market will resolve to the temperature range that contains the highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 18 Jul '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.The narrow gap between the 64-65°F (34.5%) and 66-67°F (33.0%) brackets reflects ensemble model runs from the National Weather Service placing the official KSFO high near 65°F on July 18, with modest uncertainty in marine-layer depth and afternoon clearing timing. Persistent onshore flow from the cool California Current sustains a shallow marine inversion that caps daytime heating, while any temporary weakening of the layer or brief offshore wind component could allow modest warming into the upper 60s. Historical July climatology at the airport shows average highs near 66°F, and recent NWS guidance through mid-July has favored similar mild conditions absent a strong thermal trough or wind shift.
This market will resolve to the temperature range that contains the highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 18 Jul '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Market Opened: Jul 16, 2026, 9:03 PM ET
Volume
$52,115End Date
Jul 18, 2026Market Opened
Jul 16, 2026, 9:03 PM ETResolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
This market will resolve to the temperature range that contains the highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 18 Jul '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.The narrow gap between the 64-65°F (34.5%) and 66-67°F (33.0%) brackets reflects ensemble model runs from the National Weather Service placing the official KSFO high near 65°F on July 18, with modest uncertainty in marine-layer depth and afternoon clearing timing. Persistent onshore flow from the cool California Current sustains a shallow marine inversion that caps daytime heating, while any temporary weakening of the layer or brief offshore wind component could allow modest warming into the upper 60s. Historical July climatology at the airport shows average highs near 66°F, and recent NWS guidance through mid-July has favored similar mild conditions absent a strong thermal trough or wind shift.
This market will resolve to the temperature range that contains the highest temperature recorded at the San Francisco International Airport Station in degrees Fahrenheit on 18 Jul '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the San Francisco International Airport Station, 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 until the first data point for the following date has been published on the resolution source.
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.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Volume
$52,115End Date
Jul 18, 2026Market Opened
Jul 16, 2026, 9:03 PM ETResolution Source
https://www.wunderground.com/history/daily/us/ca/san-francisco/KSFOResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The narrow gap between the 64-65°F (34.5%) and 66-67°F (33.0%) brackets reflects ensemble model runs from the National Weather Service placing the official KSFO high near 65°F on July 18, with modest uncertainty in marine-layer depth and afternoon clearing timing. Persistent onshore flow from the cool California Current sustains a shallow marine inversion that caps daytime heating, while any temporary weakening of the layer or brief offshore wind component could allow modest warming into the upper 60s. Historical July climatology at the airport shows average highs near 66°F, and recent NWS guidance through mid-July has favored similar mild conditions absent a strong thermal trough or wind shift.
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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