January is one of the cooler months of the year in Weslaco, with average highs near 22.6°C and lows around 10.4°C (mean 16.5°C). It is one of the drier months, averaging 27 mm of rainfall and 71% relative humidity across the period.
January is one of the cooler months of the year in Weslaco. Across 45 years of records, the warmest January in Weslaco was 1989 — when the month averaged 20.2°C — while the coldest were 1985 and 2015 at 12.9°C. Typical January days reach 22.6°C with nights near 10.4°C. The long-term January temperature trend is broadly flat.
January is one of the drier months in Weslaco, averaging 27 mm of rainfall. The wettest January on record was 1984 with 131 mm, while the driest was 1982 at 1 mm.
Relative humidity in Weslaco during January averages 71%. The most humid January was 1992 at 79%, and the least humid was 1982 at 62%.
January receives about 3 kWh/m²/day of solar energy in Weslaco. The sunniest January was 1999 at 3.8 kWh/m²/day, and the cloudiest were 1992 and 1993 at 2.2.
Average wind speed in Weslaco during January is 3.2 m/s. The windiest January was 2002 at 3.9 m/s, while the calmest was 1983 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.6°C | 17.1°C | 17.4°C | 15.7°C | 16.8°C | +1.2°C |
| Avg High | 21.6°C | 23.3°C | 23.3°C | 21.9°C | 23.2°C | +1.6°C |
| Avg Low | 9.6°C | 11.0°C | 11.4°C | 9.6°C | 10.5°C | +0.9°C |
| Avg Rain | 42 mm | 19 mm | 21 mm | 28 mm | 27 mm | -15 mm |
January temperatures in Weslaco have risen by about 1.3°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -4.9°C (1985) to a record high of 35.2°C (2013).
Rainfall in January is one of the drier months, averaging 27 mm, with a wettest year of 131 mm.
A good time to visit Weslaco
January is a good time to visit Weslaco, with days averaging 22.6°C and nights around 10.4°C (mean 16.5°C, cooler than Weslaco's yearly average) and low rainfall. March and November are marginally more temperate, but January still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.9°C | 14.1°C | 8.4°C | 31.8°C | -4.1°C | 31 mm | 71% | 3.2 m/s | 2.7 |
| 2024 | 22.3°C | 15.7°C | 9.2°C | 29.9°C | -2.8°C | 31 mm | 72% | 2.8 m/s | 3.2 |
| 2023 | 26.3°C | 19.8°C | 13.2°C | 32.1°C | 6.3°C | 4 mm | 71% | 3.2 m/s | 3.3 |
| 2022 | 20.8°C | 14.5°C | 8.3°C | 32.7°C | 0.9°C | 62 mm | 74% | 2.9 m/s | 3 |
| 2021 | 24.3°C | 17.4°C | 10.5°C | 32.6°C | 1.5°C | 21 mm | 68% | 3 m/s | 3.2 |
| 2020 | 25.4°C | 19.5°C | 13.6°C | 30.8°C | 7.2°C | 13 mm | 70% | 3.3 m/s | 3.2 |
| 2019 | 22.3°C | 16.6°C | 10.9°C | 28.7°C | 5.0°C | 39 mm | 74% | 3.2 m/s | 3.1 |
| 2018 | 19.9°C | 13.8°C | 7.7°C | 29.1°C | -0.1°C | 18 mm | 68% | 3.1 m/s | 3.1 |
| 2017 | 25.6°C | 19.0°C | 12.5°C | 33.5°C | -1.0°C | 15 mm | 67% | 3.6 m/s | 3.3 |
| 2016 | 21.1°C | 14.8°C | 8.5°C | 28.9°C | 3.2°C | 36 mm | 73% | 3 m/s | 3.3 |
| 2015 | 18.4°C | 12.9°C | 7.4°C | 28.6°C | 1.2°C | 59 mm | 78% | 2.9 m/s | 2.7 |
| 2014 | 20.1°C | 13.4°C | 6.7°C | 27.0°C | -0.8°C | 16 mm | 74% | 3.1 m/s | 3.3 |
| 2013 | 22.5°C | 16.8°C | 11.0°C | 35.2°C | 3.4°C | 37 mm | 69% | 3.6 m/s | 3 |
| 2012 | 25.4°C | 18.7°C | 12.1°C | 32.4°C | 3.5°C | 5 mm | 67% | 3.3 m/s | 3.3 |
| 2011 | 23.5°C | 17.1°C | 10.6°C | 30.1°C | 3.5°C | 30 mm | 69% | 3 m/s | 3.1 |
| 2010 | 20.0°C | 14.2°C | 8.4°C | 28.0°C | -3.9°C | 27 mm | 74% | 3.3 m/s | 3.1 |
| 2009 | 24.9°C | 18.4°C | 12.0°C | 30.9°C | 6.2°C | 1 mm | 65% | 3.2 m/s | 3.5 |
| 2008 | 21.9°C | 16.2°C | 10.4°C | 32.3°C | 2.5°C | 31 mm | 70% | 3.5 m/s | 2.8 |
| 2007 | 19.1°C | 14.1°C | 9.1°C | 28.4°C | 1.5°C | 57 mm | 78% | 3.4 m/s | 2.3 |
| 2006 | 26.1°C | 19.3°C | 12.4°C | 32.5°C | 6.0°C | 1 mm | 63% | 3.3 m/s | 3.6 |
| 2005 | 25.4°C | 19.5°C | 13.6°C | 32.1°C | 5.6°C | 18 mm | 73% | 3.4 m/s | 3.2 |
| 2004 | 22.3°C | 17.4°C | 12.4°C | 30.0°C | 4.4°C | 42 mm | 77% | 3.4 m/s | 2.8 |
| 2003 | 20.9°C | 15.2°C | 9.4°C | 29.5°C | 2.5°C | 21 mm | 77% | 2.7 m/s | 3 |
| 2002 | 24.6°C | 18.0°C | 11.3°C | 32.7°C | -1.1°C | 1 mm | 69% | 3.9 m/s | 3.5 |
| 2001 | 21.8°C | 16.0°C | 10.2°C | 30.2°C | 0.8°C | 16 mm | 72% | 3.6 m/s | 2.7 |
| 2000 | 26.0°C | 19.6°C | 13.3°C | 32.2°C | 3.2°C | 23 mm | 69% | 3.5 m/s | 3.2 |
| 1999 | 25.0°C | 18.1°C | 11.2°C | 32.3°C | 2.6°C | 2 mm | 67% | 3.8 m/s | 3.8 |
| 1998 | 25.8°C | 19.4°C | 13.0°C | 30.6°C | 6.1°C | 7 mm | 72% | 3.3 m/s | 3.4 |
| 1997 | 21.9°C | 15.7°C | 9.4°C | 32.8°C | -0.1°C | 7 mm | 68% | 3.4 m/s | 2.6 |
| 1996 | 23.2°C | 15.8°C | 8.4°C | 31.3°C | -1.7°C | 6 mm | 65% | 3.6 m/s | 3.7 |
| 1995 | 23.7°C | 17.7°C | 11.7°C | 31.3°C | 5.6°C | 12 mm | 66% | 3.3 m/s | 3.1 |
| 1994 | 22.9°C | 17.3°C | 11.7°C | 30.6°C | 2.1°C | 47 mm | 72% | 3.3 m/s | 3 |
| 1993 | 22.7°C | 17.1°C | 11.4°C | 29.4°C | 3.3°C | 11 mm | 72% | 2.8 m/s | 2.2 |
| 1992 | 19.3°C | 14.6°C | 9.8°C | 27.6°C | 1.3°C | 76 mm | 79% | 2.7 m/s | 2.2 |
| 1991 | 22.7°C | 16.6°C | 10.5°C | 31.8°C | 4.9°C | 19 mm | 71% | 3 m/s | 2.5 |
| 1990 | 25.3°C | 18.9°C | 12.6°C | 33.2°C | 5.1°C | 7 mm | 68% | 3.4 m/s | 3 |
| 1989 🔥 | 25.9°C | 20.2°C | 14.5°C | 32.4°C | 4.8°C | 16 mm | 73% | 3.3 m/s | 2.6 |
| 1988 | 19.4°C | 13.6°C | 7.7°C | 29.8°C | -0.2°C | 47 mm | 69% | 3.2 m/s | 2.6 |
| 1987 | 21.2°C | 15.1°C | 8.9°C | 28.6°C | 1.2°C | 43 mm | 72% | 2.8 m/s | 3.1 |
| 1986 | 23.3°C | 16.7°C | 10.0°C | 29.2°C | 2.0°C | 16 mm | 68% | 3 m/s | 3.3 |
| 1985 ❄️ | 19.2°C | 12.9°C | 6.5°C | 31.9°C | -4.9°C | 29 mm | 69% | 3.3 m/s | 2.7 |
| 1984 🌧️ | 18.4°C | 13.5°C | 8.7°C | 26.2°C | -0.6°C | 131 mm | 75% | 3 m/s | 2.3 |
| 1983 | 21.9°C | 15.7°C | 9.6°C | 31.0°C | 2.1°C | 19 mm | 71% | 2.5 m/s | — |
| 1982 | 24.7°C | 17.6°C | 10.5°C | 33.3°C | -2.0°C | 1 mm | 62% | 3.8 m/s | — |
| 1981 | 20.6°C | 15.2°C | 9.8°C | 27.1°C | 2.8°C | 76 mm | 77% | 2.8 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 22.6°C with lows near 10.4°C (mean 16.5°C), based on 45 years of NASA POWER data.
January averages 27 mm of rainfall in Weslaco, one of the drier months. The wettest on record was 131 mm in 1984.
The hottest January reached 35.2°C in 2013. The coldest dipped to -4.9°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.3°C. Daytime highs moved from 21°C to 22.7°C and overnight lows from 9°C to 9.9°C over the same span.
January is one of the cooler months of the year in Weslaco and one of the drier months, so plan for around 22.6°C daytime highs and 10.4°C at night.
Yes — January is the coldest month of the year in Weslaco, averaging 16.5°C.
For January in Weslaco, pack light layers you can adjust through the day, with typical highs of 22.6°C and lows of 10.4°C.
Relative humidity in January averages 71% — moderately humid.
Average wind speed in January is 3.2 m/s. The windiest January on record averaged 3.9 m/s (2002).
The wettest January on record was 1984 with 131 mm. On average, January sees 27 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 January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
