Weslaco receives its highest rainfall in Sep, while humidity peaks during winter months.
🌧️ Wettest:Sep — 113 mm☀️ Driest:Feb — 24 mm
💧 Humidity peaks at 71% in Dec · annual avg 68%
🌍 Climate Summary
Avg Annual Temp:75.9°F
Avg Annual Rainfall:615 mm
Avg Humidity:68%
Data Period:1981 – 2025
Weslaco Climate Overview
Weslaco has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in May and drop to their lowest in Jan,
while rainfall is highest during autumn months.
Humidity remains moderate throughout the year, especially during winter months, creating warm and humid conditions.
📈 Yearly Trends
The warmest year in Weslaco's recorded history was 1998
(avg: 78.8°F),
while the coldest year was 2010
(avg: 72.9°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Weslaco's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has increased noticeably in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Weslaco's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
117.6°F in Jun 1998,
while the lowest dropped to
17.2°F in Dec 1989.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Weslaco shows noticeable variation. Rainfall has increased noticeably in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), May is typically the hottest month in Weslaco, Texas, with average high temperatures around 104.6°F.
What is the coldest month in Weslaco?▼
Jan is the coldest month in Weslaco, with average low temperatures around 35.6°F.
What is the rainiest month in Weslaco?▼
Sep receives the most rainfall with approximately 113 mm, while Feb is the driest with 24 mm.
What was the highest temperature ever recorded in Weslaco?▼
The highest recorded temperature was 117.6°F in Jun 1998. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Weslaco?▼
The lowest recorded temperature was 17.2°F in Dec 1989.
How many years of data does this page cover?▼
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
How much sunlight does Weslaco get?▼
Weslaco receives the most sunlight in Jul with an average solar radiation of 6.51 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Texas.
Where does this weather data come from?▼
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.