San Luis Obispo receives its highest rainfall in Jan, while humidity peaks during winter months.
🌧️ Wettest:Jan — 80 mm☀️ Driest:Aug — 2 mm
💧 Humidity peaks at 76% in Feb · annual avg 63%
🌍 Climate Summary
Avg Annual Temp:63.7°F
Avg Annual Rainfall:389 mm
Avg Humidity:63%
Data Period:1981 – 2025
San Luis Obispo Climate Overview
San Luis Obispo has a warm temperate climate with warm summers and mild winters.
Temperatures peak in Jul and drop to their lowest in Dec,
while rainfall is highest during winter months.
Humidity remains moderate throughout the year, especially during winter months, creating warm and dry conditions.
📈 Yearly Trends
The warmest year in San Luis Obispo's recorded history was 2014
(avg: 66.4°F),
while the coldest year was 1982
(avg: 60.6°F),
based on annual average temperatures.
📊 Key Climate Trends
🌡️ San Luis Obispo's temperature has remained relatively stable over the past decade
📈 Minimum temperatures show a slight warming trend in recent years
🌧️ Rainfall varies year-to-year without a clear long-term trend
🌡️ Annual Temperature Trend
View Range:
Average annual high/low · Last 10 years · °F
San Luis Obispo's temperatures has remained relatively stable over the past decade.
The highest recorded temperature reached
108.7°F in Sep 2017,
while the lowest dropped to
24.1°F in Dec 1990.
🌧️ Annual Precipitation
View Range:
Total annual precipitation · Last 10 years · mm/year
Annual rainfall in San Luis Obispo shows noticeable variation. Rainfall varies year-to-year without a clear long-term trend.
Based on 45 years of data (1981–2025), Jul is typically the hottest month in San Luis Obispo, California, with average high temperatures around 99°F.
What is the coldest month in San Luis Obispo?▼
Dec is the coldest month in San Luis Obispo, with average low temperatures around 33.2°F.
What is the rainiest month in San Luis Obispo?▼
Jan receives the most rainfall with approximately 80 mm, while Aug is the driest with 2 mm.
What was the highest temperature ever recorded in San Luis Obispo?▼
The highest recorded temperature was 108.7°F in Sep 2017. This is part of the historical record spanning 1981–2025.
What was the lowest temperature ever recorded in San Luis Obispo?▼
The lowest recorded temperature was 24.1°F in Dec 1990.
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 San Luis Obispo get?▼
San Luis Obispo receives the most sunlight in Jun with an average solar radiation of 8.09 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability in California.
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.