August is one of the warmer months of the year in Harlingen, with average highs near 34.3°C and lows around 26.2°C (mean 30.3°C). It is about average for rainfall, averaging 52 mm of rainfall and 70% relative humidity across the period.
August is one of the warmer months of the year in Harlingen. Across 45 years of records, the warmest August in Harlingen was 2023 — when the month averaged 31.9°C — while the coldest was 2008 at 28.7°C. Typical August days reach 34.3°C with nights near 26.2°C. The long-term trend is warming, about 0.3°C per decade.
August is about average for rainfall in Harlingen, averaging 52 mm of rainfall. The wettest August on record was 1995 with 188 mm, while the driest was 1993 at 3 mm.
Relative humidity in Harlingen during August averages 70%. The most humid August was 2008 at 81%, and the least humid was 2009 at 65%.
August receives about 6.2 kWh/m²/day of solar energy in Harlingen. The sunniest Augusts were 1993 and 2011 at 6.6 kWh/m²/day, and the cloudiest were 1988, 1996 and 2008 at 5.5.
Average wind speed in Harlingen during August is 3.2 m/s. The windiest Augusts were 2001, 2017 and 2019 at 3.8 m/s, while the calmest was 2024 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.9°C | 30.0°C | 30.0°C | 30.8°C | 30.9°C | +1°C |
| Avg High | 33.9°C | 33.9°C | 33.9°C | 35.1°C | 35.0°C | +1.1°C |
| Avg Low | 25.8°C | 26.0°C | 26.1°C | 26.6°C | 26.7°C | +0.9°C |
| Avg Rain | 52 mm | 73 mm | 58 mm | 35 mm | 34 mm | -18 mm |
August temperatures in Harlingen have risen by about 1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 22.7°C (2010) to a record high of 40.8°C (2023).
Rainfall in August is about average for rainfall, averaging 52 mm, with a wettest year of 188 mm.
A quieter season to visit Harlingen
If your dates are flexible, the more temperate months of March and November tend to be the most comfortable for visiting Harlingen. That said, August — with days averaging 34.3°C and nights around 26.2°C (mean 30.3°C) and moderate rainfall (52 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.1°C | 30.8°C | 26.6°C | 37.1°C | 25.7°C | 52 mm | 71% | 2.8 m/s | 6.3 |
| 2024 | 35.8°C | 31.4°C | 26.9°C | 38.6°C | 24.6°C | 26 mm | 69% | 2.4 m/s | 6.2 |
| 2023 🔥 | 36.5°C | 31.9°C | 27.3°C | 40.8°C | 23.7°C | 25 mm | 69% | 3.4 m/s | 6.5 |
| 2022 | 34.1°C | 30.4°C | 26.8°C | 36.8°C | 25.8°C | 66 mm | 72% | 3.5 m/s | 5.8 |
| 2021 | 33.6°C | 30.0°C | 26.3°C | 36.9°C | 25.1°C | 18 mm | 75% | 3 m/s | 6.5 |
| 2020 | 34.9°C | 30.6°C | 26.3°C | 37.1°C | 24.1°C | 18 mm | 70% | 3.1 m/s | 6.5 |
| 2019 | 36.0°C | 31.7°C | 27.5°C | 38.2°C | 25.9°C | 13 mm | 68% | 3.8 m/s | 6.5 |
| 2018 | 34.6°C | 30.5°C | 26.5°C | 37.2°C | 24.7°C | 10 mm | 68% | 3.6 m/s | 6.4 |
| 2017 | 35.5°C | 31.2°C | 26.9°C | 38.3°C | 24.4°C | 45 mm | 67% | 3.8 m/s | 6.1 |
| 2016 | 35.2°C | 31.1°C | 27.0°C | 38.0°C | 25.7°C | 38 mm | 68% | 3.4 m/s | 6.3 |
| 2015 | 34.9°C | 30.6°C | 26.3°C | 37.6°C | 23.7°C | 75 mm | 69% | 3.3 m/s | 6.2 |
| 2014 | 34.4°C | 30.5°C | 26.5°C | 37.8°C | 24.5°C | 51 mm | 69% | 3.5 m/s | 6 |
| 2013 | 34.6°C | 30.3°C | 26.0°C | 37.6°C | 24.7°C | 50 mm | 68% | 3.2 m/s | 6 |
| 2012 | 35.2°C | 30.8°C | 26.4°C | 39.5°C | 24.2°C | 25 mm | 67% | 3.4 m/s | 6.3 |
| 2011 | 35.9°C | 31.3°C | 26.7°C | 37.9°C | 23.9°C | 26 mm | 68% | 3.4 m/s | 6.6 |
| 2010 | 34.5°C | 30.3°C | 26.2°C | 37.5°C | 22.7°C | 13 mm | 71% | 2.9 m/s | 6.5 |
| 2009 | 35.6°C | 31.0°C | 26.3°C | 37.5°C | 24.4°C | 30 mm | 65% | 3.4 m/s | 6.3 |
| 2008 ❄️ | 31.9°C | 28.7°C | 25.5°C | 34.3°C | 23.8°C | 109 mm | 81% | 2.9 m/s | 5.5 |
| 2007 | 32.3°C | 29.1°C | 25.9°C | 35.1°C | 24.3°C | 94 mm | 79% | 2.7 m/s | 5.8 |
| 2006 | 33.6°C | 30.0°C | 26.3°C | 36.4°C | 25.1°C | 22 mm | 73% | 3.1 m/s | 6.2 |
| 2005 | 34.7°C | 30.6°C | 26.5°C | 40.2°C | 24.8°C | 16 mm | 69% | 2.9 m/s | 6.4 |
| 2004 | 34.5°C | 30.3°C | 26.1°C | 37.3°C | 23.2°C | 58 mm | 69% | 3.2 m/s | 6.2 |
| 2003 | 33.5°C | 29.6°C | 25.7°C | 38.1°C | 24.8°C | 76 mm | 74% | 3 m/s | 6.2 |
| 2002 | 34.3°C | 30.3°C | 26.3°C | 38.1°C | 24.8°C | 27 mm | 70% | 3.2 m/s | 6.3 |
| 2001 | 34.4°C | 30.4°C | 26.5°C | 37.2°C | 24.7°C | 81 mm | 70% | 3.8 m/s | 5.9 |
| 2000 | 33.8°C | 29.7°C | 25.7°C | 37.9°C | 24.0°C | 67 mm | 70% | 2.9 m/s | 6 |
| 1999 | 33.9°C | 29.8°C | 25.7°C | 37.3°C | 23.6°C | 83 mm | 72% | 3 m/s | 6.2 |
| 1998 | 34.9°C | 30.9°C | 26.9°C | 38.2°C | 25.4°C | 45 mm | 69% | 3.1 m/s | 6.1 |
| 1997 | 35.0°C | 30.7°C | 26.3°C | 37.9°C | 24.2°C | 27 mm | 67% | 3.5 m/s | 6.3 |
| 1996 | 32.3°C | 29.1°C | 25.8°C | 36.0°C | 24.5°C | 171 mm | 75% | 3.5 m/s | 5.5 |
| 1995 🌧️ | 32.8°C | 29.4°C | 26.0°C | 36.1°C | 23.8°C | 188 mm | 75% | 2.6 m/s | 5.7 |
| 1994 | 33.3°C | 29.4°C | 25.5°C | 36.2°C | 22.8°C | 66 mm | 72% | 3.2 m/s | 6 |
| 1993 | 34.7°C | 30.5°C | 26.2°C | 36.5°C | 24.6°C | 3 mm | 66% | 3.7 m/s | 6.6 |
| 1992 | 33.7°C | 29.5°C | 25.2°C | 36.3°C | 22.8°C | 54 mm | 70% | 2.8 m/s | 6.1 |
| 1991 | 34.6°C | 30.2°C | 25.8°C | 37.1°C | 23.7°C | 38 mm | 69% | 3.2 m/s | 6.3 |
| 1990 | 34.0°C | 30.1°C | 26.2°C | 36.3°C | 25.1°C | 51 mm | 68% | 3.5 m/s | 6.1 |
| 1989 | 34.2°C | 30.1°C | 26.0°C | 37.0°C | 24.4°C | 41 mm | 68% | 3.4 m/s | 6.2 |
| 1988 | 33.6°C | 29.7°C | 25.8°C | 38.1°C | 24.7°C | 80 mm | 73% | 2.8 m/s | 5.5 |
| 1987 | 34.2°C | 30.2°C | 26.2°C | 35.8°C | 25.0°C | 26 mm | 70% | 3.6 m/s | 6.3 |
| 1986 | 33.8°C | 29.7°C | 25.5°C | 38.7°C | 23.0°C | 38 mm | 69% | 3.3 m/s | 6 |
| 1985 | 34.8°C | 30.3°C | 25.8°C | 36.7°C | 23.7°C | 45 mm | 67% | 3.4 m/s | 6.5 |
| 1984 | 33.9°C | 29.8°C | 25.6°C | 36.3°C | 23.9°C | 26 mm | 67% | 3.5 m/s | 5.8 |
| 1983 | 33.2°C | 29.4°C | 25.6°C | 36.9°C | 23.7°C | 60 mm | 72% | 2.9 m/s | — |
| 1982 | 34.0°C | 30.0°C | 25.9°C | 36.7°C | 23.8°C | 24 mm | 68% | 3.4 m/s | — |
| 1981 | 33.5°C | 29.8°C | 26.1°C | 36.8°C | 24.9°C | 125 mm | 71% | 3.1 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 34.3°C with lows near 26.2°C (mean 30.3°C), based on 45 years of NASA POWER data.
August averages 52 mm of rainfall in Harlingen, about average for rainfall. The wettest on record was 188 mm in 1995.
The hottest August reached 40.8°C in 2023. The coldest dipped to 22.7°C in 2010.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1°C. Daytime highs moved from 33.9°C to 35°C and overnight lows from 25.8°C to 26.8°C over the same span.
August is one of the warmer months of the year in Harlingen and about average for rainfall, so plan for around 34.3°C daytime highs and 26.2°C at night.
Not quite — August is the 12th coolest month in Harlingen, averaging 30.3°C.
For August in Harlingen, pack light, breathable clothing and sun protection, with typical highs of 34.3°C and lows of 26.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 70% — moderately humid.
Average wind speed in August is 3.2 m/s. The windiest August on record averaged 3.8 m/s (2001).
The wettest August on record was 1995 with 188 mm. On average, August sees 52 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Harlingen behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.
