March is one of the cooler months of the year in Harlingen, with average highs near 27.4°C and lows around 16.8°C (mean 22.1°C). It is one of the drier months, averaging 33 mm of rainfall and 71% relative humidity across the period.
March is one of the cooler months of the year in Harlingen. Across 45 years of records, the warmest March in Harlingen was 2020 — when the month averaged 25°C — while the coldest was 1987 at 19°C. Typical March days reach 27.4°C with nights near 16.8°C. The long-term trend is warming, about 0.4°C per decade.
March is one of the drier months in Harlingen, averaging 33 mm of rainfall. The wettest March on record was 1997 with 177 mm, while the driest was 2013 at 1 mm.
Relative humidity in Harlingen during March averages 71%. The most humid March was 2015 at 82%, and the least humid was 1986 at 63%.
March receives about 4.6 kWh/m²/day of solar energy in Harlingen. The sunniest March was 1986 at 5.5 kWh/m²/day, and the cloudiest was 2019 at 3.5.
Average wind speed in Harlingen during March is 4.1 m/s. The windiest March was 2008 at 5 m/s, while the calmest was 2015 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.1°C | 22.0°C | 22.5°C | 22.0°C | 23.2°C | +2.1°C |
| Avg High | 26.7°C | 27.3°C | 27.8°C | 27.1°C | 28.8°C | +2.1°C |
| Avg Low | 15.7°C | 16.6°C | 17.3°C | 16.8°C | 17.7°C | +2°C |
| Avg Rain | 19 mm | 42 mm | 28 mm | 37 mm | 45 mm | +26 mm |
March temperatures in Harlingen have risen by about 1.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of 3.5°C (1989) to a record high of 38.6°C (1984).
Rainfall in March is one of the drier months, averaging 33 mm, with a wettest year of 177 mm.
One of the best times to visit Harlingen
March is one of the best times to visit Harlingen. Expect days averaging 27.4°C and nights around 16.8°C (mean 22.1°C) — cooler than Harlingen's yearly average — with moderate rainfall (33 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 29.8°C | 23.9°C | 17.9°C | 37.5°C | 11.3°C | 166 mm | 69% | 3.9 m/s | 5.3 |
| 2024 | 28.5°C | 23.4°C | 18.3°C | 33.3°C | 12.9°C | 26 mm | 75% | 3.6 m/s | 4.4 |
| 2023 | 29.1°C | 24.0°C | 19.0°C | 37.4°C | 10.3°C | 49 mm | 73% | 4.4 m/s | 4.2 |
| 2022 | 26.9°C | 20.6°C | 14.2°C | 34.1°C | 5.4°C | 3 mm | 70% | 4 m/s | 5.3 |
| 2021 | 28.2°C | 22.5°C | 16.8°C | 34.5°C | 11.2°C | 10 mm | 71% | 4.1 m/s | 4.5 |
| 2020 🔥 | 30.0°C | 25.0°C | 20.0°C | 35.4°C | 12.0°C | 14 mm | 75% | 4.3 m/s | 4.6 |
| 2019 | 26.0°C | 21.2°C | 16.4°C | 35.5°C | 5.9°C | 56 mm | 74% | 4.2 m/s | 3.5 |
| 2018 | 28.8°C | 23.7°C | 18.5°C | 34.7°C | 14.1°C | 7 mm | 71% | 4.2 m/s | 4.8 |
| 2017 | 28.1°C | 23.8°C | 19.5°C | 33.8°C | 12.9°C | 71 mm | 75% | 4.3 m/s | 4.8 |
| 2016 | 28.7°C | 23.5°C | 18.2°C | 37.8°C | 10.5°C | 53 mm | 74% | 4 m/s | 4.5 |
| 2015 | 24.9°C | 20.2°C | 15.5°C | 29.8°C | 7.1°C | 89 mm | 82% | 3.2 m/s | 3.7 |
| 2014 | 25.0°C | 19.9°C | 14.9°C | 34.5°C | 5.4°C | 44 mm | 78% | 3.9 m/s | 4 |
| 2013 | 27.2°C | 21.5°C | 15.8°C | 37.4°C | 9.2°C | 1 mm | 63% | 4.3 m/s | 5.1 |
| 2012 | 28.5°C | 23.4°C | 18.4°C | 32.6°C | 10.1°C | 35 mm | 74% | 4.4 m/s | 4.9 |
| 2011 | 28.4°C | 23.1°C | 17.8°C | 33.6°C | 10.7°C | 3 mm | 72% | 4.3 m/s | 5.1 |
| 2010 | 25.2°C | 19.3°C | 13.4°C | 32.3°C | 4.6°C | 9 mm | 69% | 3.9 m/s | 5.1 |
| 2009 | 27.5°C | 22.2°C | 16.9°C | 35.8°C | 8.7°C | 7 mm | 68% | 4.5 m/s | 5.2 |
| 2008 | 28.4°C | 22.4°C | 16.4°C | 38.3°C | 5.7°C | 3 mm | 64% | 5 m/s | 5.2 |
| 2007 | 26.9°C | 22.5°C | 18.1°C | 30.1°C | 6.6°C | 50 mm | 75% | 4.3 m/s | 4.6 |
| 2006 | 28.6°C | 23.7°C | 18.8°C | 35.1°C | 9.2°C | 27 mm | 72% | 4.7 m/s | 4.7 |
| 2005 | 28.4°C | 22.5°C | 16.6°C | 36.0°C | 10.3°C | 11 mm | 70% | 3.7 m/s | 4.9 |
| 2004 | 27.5°C | 23.0°C | 18.5°C | 30.6°C | 13.6°C | 72 mm | 78% | 3.9 m/s | 4.5 |
| 2003 | 27.5°C | 21.8°C | 16.1°C | 32.7°C | 8.7°C | 25 mm | 73% | 3.5 m/s | 4.3 |
| 2002 | 27.4°C | 21.9°C | 16.3°C | 37.0°C | 4.4°C | 4 mm | 69% | 4.6 m/s | 4.4 |
| 2001 | 26.6°C | 20.9°C | 15.2°C | 32.8°C | 8.9°C | 15 mm | 69% | 3.7 m/s | 4.4 |
| 2000 | 29.2°C | 24.4°C | 19.6°C | 35.4°C | 13.7°C | 63 mm | 75% | 4.3 m/s | 4.7 |
| 1999 | 28.1°C | 22.9°C | 17.7°C | 35.8°C | 9.9°C | 65 mm | 72% | 4.5 m/s | 4.7 |
| 1998 | 26.0°C | 21.0°C | 15.9°C | 34.2°C | 8.2°C | 20 mm | 68% | 4.4 m/s | 4.8 |
| 1997 🌧️ | 27.1°C | 22.2°C | 17.3°C | 33.8°C | 11.9°C | 177 mm | 80% | 3.6 m/s | 3.9 |
| 1996 | 25.6°C | 19.8°C | 14.0°C | 35.5°C | 6.4°C | 7 mm | 66% | 4.1 m/s | 4.6 |
| 1995 | 27.6°C | 22.0°C | 16.4°C | 35.7°C | 6.3°C | 26 mm | 72% | 3.9 m/s | 4.1 |
| 1994 | 27.3°C | 21.9°C | 16.4°C | 35.9°C | 7.1°C | 36 mm | 71% | 3.8 m/s | 4.6 |
| 1993 | 26.7°C | 21.2°C | 15.7°C | 33.6°C | 5.1°C | 55 mm | 73% | 3.6 m/s | 4.5 |
| 1992 | 27.4°C | 22.4°C | 17.5°C | 33.8°C | 10.5°C | 6 mm | 73% | 3.8 m/s | 4.1 |
| 1991 | 30.3°C | 24.0°C | 17.7°C | 37.6°C | 10.8°C | 7 mm | 63% | 4.3 m/s | 5.3 |
| 1990 | 27.1°C | 22.2°C | 17.3°C | 33.5°C | 8.9°C | 24 mm | 73% | 4.4 m/s | 4.3 |
| 1989 | 27.0°C | 20.7°C | 14.4°C | 37.8°C | 3.5°C | 2 mm | 67% | 4.2 m/s | 5.4 |
| 1988 | 25.2°C | 20.1°C | 15.1°C | 31.6°C | 5.7°C | 32 mm | 72% | 4.3 m/s | 4.4 |
| 1987 ❄️ | 24.5°C | 19.0°C | 13.5°C | 30.5°C | 4.9°C | 16 mm | 70% | 3.4 m/s | 4.7 |
| 1986 | 27.7°C | 22.0°C | 16.4°C | 32.4°C | 10.4°C | 4 mm | 63% | 3.7 m/s | 5.5 |
| 1985 | 27.5°C | 22.5°C | 17.6°C | 31.4°C | 11.8°C | 21 mm | 75% | 4.3 m/s | 4.3 |
| 1984 | 27.3°C | 21.7°C | 16.1°C | 38.6°C | 8.3°C | 3 mm | 68% | 4.2 m/s | 4.7 |
| 1983 | 26.9°C | 20.7°C | 14.5°C | 34.5°C | 10.5°C | 24 mm | 68% | 3.8 m/s | — |
| 1982 | 28.3°C | 22.9°C | 17.5°C | 33.4°C | 6.2°C | 4 mm | 75% | 4.3 m/s | — |
| 1981 | 25.6°C | 20.7°C | 15.9°C | 33.6°C | 9.0°C | 65 mm | 71% | 3.9 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 27.4°C with lows near 16.8°C (mean 22.1°C), based on 45 years of NASA POWER data.
March averages 33 mm of rainfall in Harlingen, one of the drier months. The wettest on record was 177 mm in 1997.
The hottest March reached 38.6°C in 1984. The coldest dipped to 3.5°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 1.2°C. Daytime highs moved from 27.1°C to 28.5°C and overnight lows from 16.3°C to 17.2°C over the same span.
March is one of the cooler months of the year in Harlingen and one of the drier months, so plan for around 27.4°C daytime highs and 16.8°C at night.
Not quite — March is the 4th coolest month in Harlingen, averaging 22.1°C.
For March in Harlingen, pack light layers you can adjust through the day, with typical highs of 27.4°C and lows of 16.8°C.
Relative humidity in March averages 71% — moderately humid.
Average wind speed in March is 4.1 m/s. The windiest March on record averaged 5 m/s (2008).
The wettest March on record was 1997 with 177 mm. On average, March sees 33 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 March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
