Texas, United States of America · population 65,774 · 170 weather stations within 200 km · records 1769 to 2025
Harlingen has an average annual daytime high of 28.5°C, based on the 1951 to 1980 baseline. Its warmest month is August, when highs typically reach 34.6°C, and its coldest is January, with overnight lows near 9.9°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, Harlingen's average temperature has risen by +1.6°C. Compared to the earliest station records that begin in 1769, warming totals +1.6°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
Harlingen's average annual daytime high is 28.5°C, based on the 1951 to 1980 baseline period. The warmest month is August, with highs averaging 34.6°C, and the coldest is January, with lows averaging 9.9°C.
August is the warmest month in Harlingen, with typical daytime highs of 34.6°C.
2016 is the hottest year on record for Harlingen, running +2.1°C above the 1951 to 1980 baseline.
Yes. Since 1900, Harlingen has warmed by roughly +1.6°C.
January to December typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.