July is one of the warmer months of the year in Harlingen, with average highs near 33.9°C and lows around 25.8°C (mean 29.9°C). It is about average for rainfall, averaging 63 mm of rainfall and 71% relative humidity across the period.
July is one of the warmer months of the year in Harlingen. Across 45 years of records, the warmest July in Harlingen was 2023 — when the month averaged 31.5°C — while the coldest was 2008 at 27.8°C. Typical July days reach 33.9°C with nights near 25.8°C. The long-term July temperature trend is broadly flat.
July is about average for rainfall in Harlingen, averaging 63 mm of rainfall. The wettest July on record was 2008 with 311 mm, while the driest was 1982 at 3 mm.
Relative humidity in Harlingen during July averages 71%. The most humid July was 2007 at 83%, and the least humid was 1996 at 65%.
July receives about 6.5 kWh/m²/day of solar energy in Harlingen. The sunniest July was 1993 at 7.2 kWh/m²/day, and the cloudiest were 2007, 2008 and 2024 at 5.7.
Average wind speed in Harlingen during July is 3.6 m/s. The windiest Julys were 2009 and 2015 at 4.3 m/s, while the calmest was 2021 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 29.6°C | 29.9°C | 29.8°C | 30.0°C | 30.2°C | +0.6°C |
| Avg High | 33.7°C | 34.0°C | 33.8°C | 34.1°C | 34.0°C | +0.3°C |
| Avg Low | 25.4°C | 25.8°C | 25.8°C | 26.0°C | 26.3°C | +0.9°C |
| Avg Rain | 57 mm | 28 mm | 96 mm | 42 mm | 112 mm | +55 mm |
July temperatures in Harlingen have risen by about 0.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 22.1°C (2019) to a record high of 39.8°C (2005).
Rainfall in July is about average for rainfall, averaging 63 mm, with a wettest year of 311 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, July — with days averaging 33.9°C and nights around 25.8°C (mean 29.9°C) and moderate rainfall (63 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 | 33.1°C | 29.4°C | 25.7°C | 36.7°C | 23.7°C | 75 mm | 77% | 3.6 m/s | 6.5 |
| 2024 | 33.9°C | 30.1°C | 26.4°C | 36.5°C | 24.8°C | 127 mm | 75% | 3 m/s | 5.7 |
| 2023 🔥 | 35.9°C | 31.5°C | 27.1°C | 37.7°C | 24.9°C | 28 mm | 70% | 3.8 m/s | 6.8 |
| 2022 | 35.4°C | 31.1°C | 26.9°C | 38.7°C | 24.9°C | 11 mm | 68% | 4.1 m/s | 6.9 |
| 2021 | 31.8°C | 28.6°C | 25.4°C | 35.1°C | 24.0°C | 255 mm | 82% | 2.8 m/s | 5.9 |
| 2020 | 34.1°C | 30.2°C | 26.4°C | 37.8°C | 25.0°C | 176 mm | 74% | 3.9 m/s | 6.3 |
| 2019 | 34.4°C | 30.3°C | 26.1°C | 37.9°C | 22.1°C | 30 mm | 71% | 3.8 m/s | 6.6 |
| 2018 | 34.7°C | 30.2°C | 25.7°C | 38.3°C | 24.3°C | 19 mm | 71% | 3.3 m/s | 6.7 |
| 2017 | 34.4°C | 30.2°C | 26.1°C | 38.1°C | 22.9°C | 25 mm | 68% | 3.6 m/s | 6.6 |
| 2016 | 34.5°C | 30.8°C | 27.0°C | 36.8°C | 25.8°C | 5 mm | 70% | 4.2 m/s | 7 |
| 2015 | 34.5°C | 30.2°C | 26.0°C | 37.1°C | 24.1°C | 17 mm | 71% | 4.3 m/s | 6.9 |
| 2014 | 34.3°C | 29.9°C | 25.5°C | 36.6°C | 23.8°C | 34 mm | 69% | 3.7 m/s | 6.5 |
| 2013 | 33.9°C | 29.8°C | 25.6°C | 37.3°C | 23.3°C | 68 mm | 69% | 3.7 m/s | 6.3 |
| 2012 | 33.6°C | 29.8°C | 26.0°C | 36.6°C | 24.6°C | 39 mm | 70% | 3.8 m/s | 6.3 |
| 2011 | 34.1°C | 30.0°C | 25.8°C | 36.8°C | 23.3°C | 16 mm | 71% | 3.6 m/s | 6.9 |
| 2010 | 32.4°C | 29.2°C | 25.9°C | 35.0°C | 23.3°C | 167 mm | 78% | 3.3 m/s | 6.2 |
| 2009 | 35.5°C | 30.8°C | 26.2°C | 37.2°C | 24.5°C | 12 mm | 68% | 4.3 m/s | 6.9 |
| 2008 ❄️ 🌧️ | 31.2°C | 27.8°C | 24.5°C | 35.1°C | 22.9°C | 311 mm | 80% | 3.6 m/s | 5.7 |
| 2007 | 31.3°C | 28.4°C | 25.4°C | 34.6°C | 23.8°C | 216 mm | 83% | 3.2 m/s | 5.7 |
| 2006 | 33.4°C | 29.6°C | 25.8°C | 36.2°C | 24.6°C | 95 mm | 72% | 3.3 m/s | 6.2 |
| 2005 | 34.8°C | 30.6°C | 26.5°C | 39.8°C | 23.4°C | 171 mm | 69% | 3.5 m/s | 6.5 |
| 2004 | 34.6°C | 30.2°C | 25.7°C | 37.6°C | 23.8°C | 12 mm | 69% | 3.4 m/s | 7 |
| 2003 | 33.5°C | 29.7°C | 25.9°C | 37.1°C | 24.4°C | 60 mm | 72% | 3.5 m/s | 6.1 |
| 2002 | 33.6°C | 29.9°C | 26.1°C | 36.2°C | 24.4°C | 39 mm | 71% | 3.9 m/s | 6.6 |
| 2001 | 34.3°C | 30.2°C | 26.0°C | 37.0°C | 24.0°C | 43 mm | 69% | 3.7 m/s | 6.9 |
| 2000 | 35.4°C | 30.5°C | 25.5°C | 38.8°C | 23.9°C | 6 mm | 65% | 4 m/s | 7.1 |
| 1999 | 32.3°C | 28.7°C | 25.2°C | 35.5°C | 23.7°C | 93 mm | 75% | 3.3 m/s | 6.2 |
| 1998 | 35.3°C | 31.0°C | 26.6°C | 37.7°C | 25.1°C | 14 mm | 68% | 3.8 m/s | 6.9 |
| 1997 | 35.0°C | 30.5°C | 25.9°C | 37.6°C | 23.3°C | 4 mm | 68% | 3.6 m/s | 7 |
| 1996 | 35.5°C | 30.9°C | 26.4°C | 37.1°C | 23.9°C | 5 mm | 65% | 3.8 m/s | 7 |
| 1995 | 34.8°C | 30.3°C | 25.8°C | 38.9°C | 24.2°C | 25 mm | 67% | 3.5 m/s | 6.7 |
| 1994 | 34.7°C | 30.4°C | 26.0°C | 37.1°C | 24.8°C | 9 mm | 67% | 4 m/s | 6.8 |
| 1993 | 32.9°C | 29.1°C | 25.3°C | 35.0°C | 24.0°C | 22 mm | 75% | 4.2 m/s | 7.2 |
| 1992 | 33.1°C | 29.4°C | 25.7°C | 35.6°C | 24.1°C | 29 mm | 72% | 4.2 m/s | 6.7 |
| 1991 | 32.7°C | 28.8°C | 24.9°C | 37.8°C | 23.4°C | 45 mm | 74% | 3.2 m/s | 6.2 |
| 1990 | 33.3°C | 29.5°C | 25.7°C | 36.1°C | 24.1°C | 31 mm | 68% | 3.5 m/s | 6 |
| 1989 | 33.9°C | 29.5°C | 25.1°C | 38.2°C | 23.2°C | 55 mm | 70% | 3.3 m/s | 6.3 |
| 1988 | 34.1°C | 30.1°C | 26.1°C | 36.3°C | 24.1°C | 43 mm | 69% | 3.4 m/s | 6.3 |
| 1987 | 33.5°C | 29.5°C | 25.5°C | 36.4°C | 23.6°C | 89 mm | 71% | 3.5 m/s | 6.4 |
| 1986 | 34.2°C | 29.8°C | 25.4°C | 36.8°C | 23.7°C | 17 mm | 68% | 4 m/s | 6.7 |
| 1985 | 32.6°C | 28.5°C | 24.5°C | 35.3°C | 22.9°C | 56 mm | 74% | 3.4 m/s | 6.5 |
| 1984 | 33.4°C | 29.1°C | 24.9°C | 35.2°C | 24.0°C | 38 mm | 68% | 3.3 m/s | 6 |
| 1983 | 33.0°C | 29.2°C | 25.5°C | 36.2°C | 23.8°C | 151 mm | 73% | 3.4 m/s | — |
| 1982 | 34.8°C | 30.3°C | 25.9°C | 36.3°C | 24.6°C | 3 mm | 67% | 4.1 m/s | — |
| 1981 | 34.0°C | 30.0°C | 26.0°C | 36.3°C | 24.1°C | 64 mm | 70% | 3.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 33.9°C with lows near 25.8°C (mean 29.9°C), based on 45 years of NASA POWER data.
July averages 63 mm of rainfall in Harlingen, about average for rainfall. The wettest on record was 311 mm in 2008.
The hottest July reached 39.8°C in 2005. The coldest dipped to 22.1°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.7°C. Daytime highs moved from 33.6°C to 34°C and overnight lows from 25.4°C to 26.3°C over the same span.
July is one of the warmer months of the year in Harlingen and about average for rainfall, so plan for around 33.9°C daytime highs and 25.8°C at night.
Not quite — July is the 11th coolest month in Harlingen, averaging 29.9°C.
For July in Harlingen, pack light, breathable clothing and sun protection, with typical highs of 33.9°C and lows of 25.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 71% — moderately humid.
Average wind speed in July is 3.6 m/s. The windiest July on record averaged 4.3 m/s (2009).
The wettest July on record was 2008 with 311 mm. On average, July sees 63 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
