San Marcos (CA) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore San Marcos’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
In San Marcos, seasonal changes bring about a moderate variation in temperatures. Average maximum daytime temperatures reach a warm 30°C in August. In January, the coolest month of the year, temperatures drop to a pleasant 19°C. At night, expect even cooler temperatures, with lows averaging around 7°C.
The chart below illustrates the average maximum day and minimum night temperatures in San Marcos by month:
Typically, the coolest time of day is between 4 AM and 6 AM, while the hottest time occurs around 3 PM, when the sun’s heating effect is strongest. August, the city’s warmest month, experiences 295 hours of sunshine.
The chart below shows the average temperature throughout the year:
January, the city’s coldest month, receives about 51 mm of rainfall spread over roughly 6 days. For more information, please visit our San Marcos Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
San Marcos Temperatures Compared World Wide
San Marcos’s average annual maximum temperature is 24°C. Let’s compare this with some popular tourist destinations:
In Barcelona, Spain, the average annual temperature is around 21°C, resulting in warm summers and mild winters throughout the year.
Meanwhile, Queenstown, New Zealand, the average annual temperature is significantly lower at 10°C, with mild summers and cold winters.
Chicago, USA, has a significant seasonal range, with an average annual temperature of 15°C.
In Tokyo, Japan, the average annual temperature is 21°C, expect warmer summers and milder winters.
How does the temperature feel?
Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.
In San Marcos, during the coolest month, January, you will experience 64% humidity, which is considered high. This is accompanied by an average maximum temperature of 20°C. In the warmest month, August, the humidity is 74% combined with an average maximum temperature of 30°C, which creates a high-feel temperature. Explore our detailed page on humidity levels for further details.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Sea vs. Land Temperatures
The influence of nearby oceans or large water bodies significantly affects local temperatures:
- Ocean Influence: Coastal regions tend to have more stable temperatures, as large bodies of water absorb and release heat slowly. This often results in milder winters and cooler summers compared to inland areas.
- Continental Climates: Landmasses well away from large bodies of water tend to show greater extremes in temperature, having hotter summers and colder winters because of the absence of water as a moderating influence.
For more detailed information about San Marcos’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our San Marcos climate page.
Current temperature in San Marcos (CA)
3 m/s
broken clouds and no rain
3 m/s
almost clear and no rain
3 m/s
clear and no rain
