Highest Daily Low Temperatures in Portland History

This is a list of the hottest daily low temperatures ever recorded in Portland, Maine history from 1871–2024 based on data from the NOAA.

Highest temperatures all-time

Record for the highest daily low temperature in Portland

The highest low temperature for a calendar day in Portland, Maine history was 79 °F which happened on Tuesday, July 4, 1911.

Rank	Temperature	Date
1	79 °F	July 4, 1911
2	78 °F	July 27, 2020
3	76 °F	July 21, 2019
3	76 °F	July 22, 2011
3	76 °F	August 26, 1932
6	75 °F	June 29, 2021
6	75 °F	July 8, 1937
6	75 °F	July 16, 1901
6	75 °F	August 3, 1879
10	74 °F	August 7, 2022
10	74 °F	August 2, 2006
10	74 °F	August 5, 1988
10	74 °F	July 17, 1969
10	74 °F	June 20, 1931
10	74 °F	June 20, 1923
10	74 °F	July 5, 1919
10	74 °F	July 10, 1912
10	74 °F	June 30, 1901
10	74 °F	July 29, 1894
10	74 °F	August 7, 1876