Slidell receives its highest rainfall in Aug, while humidity peaks during winter months.
🌧️ Wettest:Aug — 167 mm☀️ Driest:Oct — 95 mm
💧 Humidity peaks at 86% in Dec · annual avg 81%
🌍 Climate Summary
Avg Annual Temp:66°F
Avg Annual Rainfall:1624 mm
Avg Humidity:81%
Data Period:1981 – 2025
Slidell Climate Overview
Slidell has a warm subtropical climate with warm summers and cold winters.
Temperatures peak in Jul and drop to their lowest in Jan,
while rainfall is highest during summer months.
Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions.
📈 Yearly Trends
The warmest year in Slidell's recorded history was 2023
(avg: 69.1°F),
while the coldest year was 1983
(avg: 63°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ Slidell's temperature shows a slight warming trend over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall has decreased in recent years compared to earlier periods
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
Slidell's temperatures shows a slight warming trend over the past decade.
The highest recorded temperature reached
108°F in Jul 2000,
while the lowest dropped to
8.7°F in Dec 1989.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in Slidell shows noticeable variation. Rainfall has decreased in recent years compared to earlier periods.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in Slidell, Louisiana, with average high temperatures around 100.9°F.
What is the coldest month in Slidell?▼
Jan is the coldest month in Slidell, with average low temperatures around 23.3°F.
What is the rainiest month in Slidell?▼
Aug receives the most rainfall with approximately 167 mm, while Oct is the driest with 95 mm.
What was the highest temperature ever recorded in Slidell?▼
The highest recorded temperature was 108°F in Jul 2000. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in Slidell?▼
The lowest recorded temperature was 8.7°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 Slidell get?▼
Slidell receives the most sunlight in May with an average solar radiation of 6.23 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in Louisiana.
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.