October is one of the warmer months of the year in Harlingen, with average highs near 30.4°C and lows around 21.6°C (mean 26°C). It is a relatively wet time of year, averaging 70 mm of rainfall and 72% relative humidity across the period.
October is one of the warmer months of the year in Harlingen. Across 45 years of records, the warmest October in Harlingen was 2025 — when the month averaged 28.4°C — while the coldest was 1997 at 24.1°C. Typical October days reach 30.4°C with nights near 21.6°C. The long-term trend is warming, about 0.4°C per decade.
October is a relatively wet time of year in Harlingen, averaging 70 mm of rainfall. The wettest October on record was 1997 with 286 mm, while the driest was 2010 at 0 mm.
Relative humidity in Harlingen during October averages 72%. The most humid October was 2003 at 82%, and the least humid was 2011 at 60%.
October receives about 4.5 kWh/m²/day of solar energy in Harlingen. The sunniest October was 2010 at 5.3 kWh/m²/day, and the cloudiest was 1984 at 3.7.
Average wind speed in Harlingen during October is 3.2 m/s. The windiest October was 2009 at 4.2 m/s, while the calmest were 2008 and 2024 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.7°C | 25.3°C | 25.9°C | 26.5°C | 27.1°C | +1.4°C |
| Avg High | 30.0°C | 29.5°C | 30.1°C | 31.2°C | 31.9°C | +1.9°C |
| Avg Low | 21.4°C | 21.0°C | 21.8°C | 21.8°C | 22.3°C | +0.9°C |
| Avg Rain | 54 mm | 111 mm | 82 mm | 50 mm | 41 mm | -13 mm |
October temperatures in Harlingen have risen by about 1.4°C between 1981–1985 and 2021–2025.
October has ranged from a record low of 4.4°C (1993) to a record high of 38.1°C (2012).
Rainfall in October is a relatively wet time of year, averaging 70 mm, with a wettest year of 286 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A good time to visit Harlingen
October is a good time to visit Harlingen, with days averaging 30.4°C and nights around 21.6°C (mean 26°C, warmer than Harlingen's yearly average) and moderate rainfall. March and November are marginally more temperate, but October still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 33.6°C | 28.4°C | 23.3°C | 36.3°C | 10.9°C | 23 mm | 65% | 2.8 m/s | 5.1 |
| 2024 | 32.0°C | 27.3°C | 22.7°C | 33.5°C | 18.9°C | 53 mm | 72% | 2.6 m/s | 4.8 |
| 2023 | 31.6°C | 27.1°C | 22.5°C | 37.5°C | 10.5°C | 52 mm | 68% | 3.5 m/s | 4.2 |
| 2022 | 31.4°C | 26.4°C | 21.4°C | 35.7°C | 14.2°C | 25 mm | 63% | 3 m/s | 4.4 |
| 2021 | 31.3°C | 26.9°C | 22.5°C | 33.8°C | 13.5°C | 79 mm | 71% | 3 m/s | 4.9 |
| 2020 | 31.6°C | 26.4°C | 21.1°C | 36.1°C | 11.0°C | 14 mm | 70% | 3.2 m/s | 5 |
| 2019 | 31.5°C | 26.5°C | 21.5°C | 35.2°C | 9.5°C | 59 mm | 70% | 3.6 m/s | 4.6 |
| 2018 | 29.5°C | 25.3°C | 21.1°C | 34.7°C | 11.8°C | 66 mm | 78% | 3.6 m/s | 4 |
| 2017 | 30.5°C | 25.6°C | 20.7°C | 35.9°C | 9.5°C | 97 mm | 71% | 2.9 m/s | 4.6 |
| 2016 | 33.1°C | 28.3°C | 23.4°C | 35.7°C | 18.1°C | 14 mm | 66% | 2.7 m/s | 4.9 |
| 2015 | 31.1°C | 26.8°C | 22.6°C | 34.1°C | 13.9°C | 171 mm | 75% | 3.1 m/s | 4.4 |
| 2014 | 31.0°C | 26.6°C | 22.2°C | 34.4°C | 15.5°C | 37 mm | 73% | 3.1 m/s | 4.8 |
| 2013 | 31.1°C | 26.8°C | 22.5°C | 33.8°C | 15.6°C | 14 mm | 71% | 3.4 m/s | 4.6 |
| 2012 | 32.1°C | 27.3°C | 22.5°C | 38.1°C | 14.8°C | 23 mm | 66% | 3.6 m/s | 4.7 |
| 2011 | 31.5°C | 26.5°C | 21.5°C | 35.9°C | 14.0°C | 23 mm | 60% | 3.3 m/s | 5.1 |
| 2010 | 30.6°C | 25.4°C | 20.3°C | 34.3°C | 14.7°C | 0 mm | 67% | 3.2 m/s | 5.3 |
| 2009 | 30.5°C | 26.3°C | 22.2°C | 34.7°C | 11.3°C | 55 mm | 72% | 4.2 m/s | 4.3 |
| 2008 | 28.8°C | 24.4°C | 20.0°C | 32.5°C | 14.9°C | 38 mm | 74% | 2.6 m/s | 4.9 |
| 2007 | 30.4°C | 25.7°C | 21.0°C | 34.2°C | 11.4°C | 42 mm | 70% | 3 m/s | 5.1 |
| 2006 | 29.5°C | 26.1°C | 22.7°C | 33.5°C | 12.8°C | 80 mm | 79% | 3.1 m/s | 3.8 |
| 2005 | 30.9°C | 26.5°C | 22.1°C | 35.3°C | 12.1°C | 60 mm | 68% | 3.2 m/s | 4.6 |
| 2004 | 32.1°C | 28.1°C | 24.1°C | 34.2°C | 15.1°C | 49 mm | 73% | 3.6 m/s | 4.7 |
| 2003 | 28.5°C | 24.8°C | 21.0°C | 31.7°C | 10.0°C | 184 mm | 82% | 2.9 m/s | 4.3 |
| 2002 | 30.0°C | 26.3°C | 22.7°C | 35.2°C | 15.6°C | 220 mm | 80% | 3.1 m/s | 4 |
| 2001 | 30.5°C | 25.8°C | 21.1°C | 34.8°C | 15.5°C | 9 mm | 69% | 3.4 m/s | 4.7 |
| 2000 | 29.3°C | 25.3°C | 21.4°C | 35.5°C | 9.1°C | 84 mm | 75% | 3.5 m/s | 4 |
| 1999 | 30.1°C | 24.9°C | 19.7°C | 34.3°C | 12.0°C | 35 mm | 69% | 3.1 m/s | 4.8 |
| 1998 | 29.5°C | 25.9°C | 22.2°C | 33.5°C | 17.2°C | 152 mm | 80% | 3.4 m/s | 4.2 |
| 1997 ❄️ 🌧️ | 27.6°C | 24.1°C | 20.5°C | 33.4°C | 10.8°C | 286 mm | 80% | 3.3 m/s | 3.9 |
| 1996 | 29.1°C | 25.3°C | 21.4°C | 31.3°C | 13.0°C | 148 mm | 79% | 3.3 m/s | 4.2 |
| 1995 | 29.4°C | 25.2°C | 21.1°C | 35.8°C | 15.7°C | 160 mm | 73% | 3.3 m/s | 4.3 |
| 1994 | 30.0°C | 25.8°C | 21.5°C | 35.0°C | 13.2°C | 97 mm | 74% | 3.4 m/s | 4.4 |
| 1993 | 29.3°C | 24.9°C | 20.4°C | 34.3°C | 4.4°C | 53 mm | 68% | 3.6 m/s | 4.6 |
| 1992 | 30.0°C | 25.6°C | 21.2°C | 34.2°C | 17.0°C | 50 mm | 71% | 3 m/s | 3.9 |
| 1991 | 30.2°C | 25.9°C | 21.6°C | 33.0°C | 15.2°C | 97 mm | 75% | 3 m/s | 4.5 |
| 1990 | 30.1°C | 25.0°C | 20.0°C | 35.1°C | 11.0°C | 35 mm | 64% | 3 m/s | 4.8 |
| 1989 | 30.6°C | 25.4°C | 20.3°C | 36.1°C | 10.9°C | 34 mm | 66% | 3.2 m/s | 4.9 |
| 1988 | 30.5°C | 26.0°C | 21.4°C | 32.3°C | 18.9°C | 43 mm | 68% | 2.9 m/s | 4.5 |
| 1987 | 29.7°C | 25.1°C | 20.5°C | 32.2°C | 18.2°C | 45 mm | 68% | 2.8 m/s | 4.8 |
| 1986 | 29.7°C | 25.4°C | 21.2°C | 34.4°C | 14.6°C | 72 mm | 70% | 3.2 m/s | 4 |
| 1985 | 29.6°C | 25.4°C | 21.3°C | 32.7°C | 12.6°C | 69 mm | 74% | 3.5 m/s | 4.5 |
| 1984 | 29.7°C | 26.3°C | 22.9°C | 33.0°C | 16.5°C | 32 mm | 81% | 3.7 m/s | 3.7 |
| 1983 | 29.6°C | 25.3°C | 21.1°C | 33.5°C | 15.1°C | 53 mm | 74% | 2.8 m/s | — |
| 1982 | 30.3°C | 26.0°C | 21.8°C | 34.5°C | 14.7°C | 51 mm | 69% | 3.2 m/s | — |
| 1981 | 30.1°C | 26.2°C | 22.2°C | 34.0°C | 11.9°C | 85 mm | 73% | 3.6 m/s | — |
Actual recorded October data for each year, 1981–2025 — sourced from NASA POWER.
The average high in October is around 30.4°C with lows near 21.6°C (mean 26°C), based on 45 years of NASA POWER data.
October averages 70 mm of rainfall in Harlingen, a relatively wet time of year. The wettest on record was 286 mm in 1997.
The hottest October reached 38.1°C in 2012. The coldest dipped to 4.4°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average October temperatures have risen by about 1.4°C. Daytime highs moved from 29.9°C to 32°C and overnight lows from 21.9°C to 22.5°C over the same span.
October is one of the warmer months of the year in Harlingen and a relatively wet time of year, so plan for around 30.4°C daytime highs and 21.6°C at night.
Not quite — October is the 7th coolest month in Harlingen, averaging 26°C.
For October in Harlingen, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 21.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in October averages 72% — moderately humid.
Average wind speed in October is 3.2 m/s. The windiest October on record averaged 4.2 m/s (2009).
The wettest October on record was 1997 with 286 mm. On average, October sees 70 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 October, 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 October specifically, along with year-by-year records and how the month has changed over the decades.
