March is one of the cooler months of the year in Weslaco, with average highs near 29.3°C and lows around 15.7°C (mean 22.5°C). It is one of the drier months, averaging 30 mm of rainfall and 66% relative humidity across the period.
March is one of the cooler months of the year in Weslaco. Across 45 years of records, the warmest March in Weslaco was 2020 — when the month averaged 25.9°C — while the coldest was 1987 at 19°C. Typical March days reach 29.3°C with nights near 15.7°C. The long-term trend is warming, about 0.3°C per decade.
March is one of the drier months in Weslaco, averaging 30 mm of rainfall. The wettest March on record was 2025 with 162 mm, while the driest was 2013 at 0 mm.
Relative humidity in Weslaco during March averages 66%. The most humid March was 2015 at 80%, and the least humid was 1991 at 55%.
March receives about 4.6 kWh/m²/day of solar energy in Weslaco. The sunniest March was 1986 at 5.5 kWh/m²/day, and the cloudiest was 2019 at 3.5.
Average wind speed in Weslaco during March is 3.9 m/s. The windiest March was 2008 at 4.8 m/s, while the calmest was 2015 at 2.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.5°C | 22.4°C | 23.0°C | 22.2°C | 23.6°C | +2.1°C |
| Avg High | 28.4°C | 29.2°C | 29.7°C | 28.8°C | 30.6°C | +2.2°C |
| Avg Low | 14.6°C | 15.6°C | 16.3°C | 15.6°C | 16.6°C | +2°C |
| Avg Rain | 15 mm | 37 mm | 20 mm | 37 mm | 44 mm | +30 mm |
March temperatures in Weslaco have risen by about 1°C between 1981–1985 and 2021–2025.
March has ranged from a record low of 1.3°C (1989) to a record high of 40.5°C (1995).
Rainfall in March is one of the drier months, averaging 30 mm, with a wettest year of 162 mm.
One of the best times to visit Weslaco
March is one of the best times to visit Weslaco. Expect days averaging 29.3°C and nights around 15.7°C (mean 22.5°C) — cooler than Weslaco's yearly average — with low rainfall (30 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 🌧️ | 31.6°C | 24.2°C | 16.9°C | 38.4°C | 10.1°C | 162 mm | 63% | 3.7 m/s | 5.3 |
| 2024 | 30.3°C | 23.7°C | 17.2°C | 36.0°C | 11.4°C | 28 mm | 70% | 3.2 m/s | 4.4 |
| 2023 | 31.0°C | 24.4°C | 17.8°C | 38.6°C | 7.4°C | 44 mm | 67% | 4.1 m/s | 4.2 |
| 2022 | 28.3°C | 20.5°C | 12.6°C | 34.9°C | 4.5°C | 3 mm | 66% | 3.7 m/s | 5.3 |
| 2021 | 30.0°C | 22.8°C | 15.7°C | 39.1°C | 10.3°C | 18 mm | 65% | 3.9 m/s | 4.5 |
| 2020 🔥 | 32.6°C | 25.9°C | 19.2°C | 38.5°C | 11.2°C | 11 mm | 68% | 4.2 m/s | 4.6 |
| 2019 | 26.9°C | 21.0°C | 15.1°C | 37.6°C | 4.3°C | 60 mm | 71% | 3.8 m/s | 3.5 |
| 2018 | 31.1°C | 24.3°C | 17.5°C | 36.3°C | 12.1°C | 9 mm | 65% | 4 m/s | 4.8 |
| 2017 | 30.1°C | 24.1°C | 18.1°C | 35.1°C | 11.5°C | 61 mm | 71% | 4.1 m/s | 4.8 |
| 2016 | 30.2°C | 23.7°C | 17.2°C | 37.7°C | 8.6°C | 58 mm | 69% | 3.6 m/s | 4.5 |
| 2015 | 25.1°C | 19.6°C | 14.1°C | 31.8°C | 5.4°C | 94 mm | 80% | 2.9 m/s | 3.7 |
| 2014 | 26.5°C | 20.0°C | 13.5°C | 35.4°C | 3.9°C | 43 mm | 74% | 3.6 m/s | 4 |
| 2013 | 29.9°C | 22.1°C | 14.3°C | 39.7°C | 6.8°C | 0 mm | 56% | 4.1 m/s | 5.1 |
| 2012 | 30.3°C | 23.9°C | 17.5°C | 35.6°C | 8.1°C | 34 mm | 69% | 4.4 m/s | 4.9 |
| 2011 | 31.4°C | 24.1°C | 16.8°C | 38.6°C | 8.3°C | 2 mm | 65% | 4.2 m/s | 5.1 |
| 2010 | 26.5°C | 19.4°C | 12.3°C | 33.1°C | 3.9°C | 12 mm | 65% | 3.8 m/s | 5.1 |
| 2009 | 29.2°C | 22.3°C | 15.5°C | 36.5°C | 6.8°C | 10 mm | 64% | 4.3 m/s | 5.2 |
| 2008 | 30.5°C | 22.9°C | 15.4°C | 39.6°C | 5.4°C | 2 mm | 58% | 4.8 m/s | 5.2 |
| 2007 | 28.8°C | 23.2°C | 17.5°C | 34.5°C | 5.3°C | 14 mm | 70% | 4.3 m/s | 4.6 |
| 2006 | 31.1°C | 24.5°C | 17.9°C | 38.0°C | 7.2°C | 30 mm | 64% | 4.5 m/s | 4.7 |
| 2005 | 30.0°C | 22.7°C | 15.5°C | 38.2°C | 8.4°C | 12 mm | 64% | 3.5 m/s | 4.9 |
| 2004 | 29.1°C | 23.5°C | 17.9°C | 31.7°C | 13.1°C | 58 mm | 74% | 3.8 m/s | 4.5 |
| 2003 | 28.7°C | 21.9°C | 15.2°C | 34.4°C | 5.7°C | 23 mm | 68% | 3.3 m/s | 4.3 |
| 2002 | 29.9°C | 22.5°C | 15.1°C | 38.4°C | 2.0°C | 1 mm | 61% | 4.3 m/s | 4.4 |
| 2001 | 28.0°C | 20.9°C | 13.8°C | 34.0°C | 7.7°C | 15 mm | 65% | 3.5 m/s | 4.4 |
| 2000 | 31.6°C | 25.3°C | 19.0°C | 37.1°C | 11.4°C | 37 mm | 68% | 4.2 m/s | 4.7 |
| 1999 | 30.8°C | 24.1°C | 17.3°C | 37.7°C | 9.1°C | 56 mm | 66% | 4.3 m/s | 4.7 |
| 1998 | 27.6°C | 21.2°C | 14.7°C | 37.8°C | 5.7°C | 28 mm | 64% | 4.2 m/s | 4.8 |
| 1997 | 28.7°C | 22.5°C | 16.3°C | 35.0°C | 10.6°C | 141 mm | 72% | 3.3 m/s | 3.9 |
| 1996 | 27.4°C | 20.0°C | 12.7°C | 37.0°C | 2.4°C | 5 mm | 60% | 3.7 m/s | 4.6 |
| 1995 | 29.4°C | 22.4°C | 15.3°C | 40.5°C | 5.3°C | 27 mm | 66% | 3.7 m/s | 4.1 |
| 1994 | 29.4°C | 22.5°C | 15.6°C | 40.3°C | 5.7°C | 22 mm | 65% | 3.6 m/s | 4.6 |
| 1993 | 28.7°C | 21.8°C | 14.9°C | 34.8°C | 4.2°C | 55 mm | 67% | 3.4 m/s | 4.5 |
| 1992 | 28.7°C | 22.6°C | 16.5°C | 34.5°C | 9.1°C | 6 mm | 69% | 3.6 m/s | 4.1 |
| 1991 | 32.4°C | 24.6°C | 16.7°C | 38.5°C | 10.5°C | 6 mm | 55% | 3.9 m/s | 5.3 |
| 1990 | 29.1°C | 22.7°C | 16.3°C | 36.8°C | 8.2°C | 21 mm | 68% | 4.3 m/s | 4.3 |
| 1989 | 29.2°C | 21.2°C | 13.2°C | 39.7°C | 1.3°C | 1 mm | 60% | 3.9 m/s | 5.4 |
| 1988 | 27.3°C | 20.6°C | 13.9°C | 34.2°C | 3.3°C | 21 mm | 65% | 4 m/s | 4.4 |
| 1987 ❄️ | 25.8°C | 19.0°C | 12.3°C | 32.4°C | 2.9°C | 16 mm | 66% | 3.2 m/s | 4.7 |
| 1986 | 29.5°C | 22.2°C | 14.9°C | 38.5°C | 9.0°C | 3 mm | 58% | 3.5 m/s | 5.5 |
| 1985 | 29.3°C | 23.0°C | 16.7°C | 36.7°C | 10.4°C | 20 mm | 68% | 4.1 m/s | 4.3 |
| 1984 | 28.9°C | 22.0°C | 15.1°C | 39.0°C | 7.4°C | 2 mm | 65% | 4 m/s | 4.7 |
| 1983 | 28.4°C | 21.0°C | 13.5°C | 35.0°C | 8.8°C | 24 mm | 64% | 3.6 m/s | — |
| 1982 | 30.7°C | 23.7°C | 16.6°C | 38.0°C | 3.9°C | 6 mm | 69% | 4.2 m/s | — |
| 1981 | 26.9°C | 20.8°C | 14.8°C | 36.2°C | 7.8°C | 41 mm | 67% | 3.7 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 29.3°C with lows near 15.7°C (mean 22.5°C), based on 45 years of NASA POWER data.
March averages 30 mm of rainfall in Weslaco, one of the drier months. The wettest on record was 162 mm in 2025.
The hottest March reached 40.5°C in 1995. The coldest dipped to 1.3°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°C. Daytime highs moved from 28.8°C to 30.2°C and overnight lows from 15.3°C to 16°C over the same span.
March is one of the cooler months of the year in Weslaco and one of the drier months, so plan for around 29.3°C daytime highs and 15.7°C at night.
Not quite — March is the 5th coolest month in Weslaco, averaging 22.5°C.
For March in Weslaco, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 15.7°C.
Relative humidity in March averages 66% — moderately humid.
Average wind speed in March is 3.9 m/s. The windiest March on record averaged 4.8 m/s (2008).
The wettest March on record was 2025 with 162 mm. On average, March sees 30 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 Weslaco 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.
