The best times to visit San Marcos for ideal weather are
February 26th to May 20th
October 1st to November 25th
based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.
San Marcos Travel Guide
Other San Marcos Travel Info
Weather in San Marcos
Average temperatures in San Marcos vary greatly. Considering humidity, temperatures feel very nice much of the year, but hot in the summer and cold in the winter with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 50th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit San Marcos, the hottest months are August, July, and then June. See average monthly temperatures below. The warmest time of year is generally early to mid August where highs are regularly around 99.7°F (37.6°C) with temperatures rarely dropping below 75.4°F (24.1°C) at night.
San Marcos Temperatures (Fahrenheit)
San Marcos Temperatures (Celsius)
The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.
San Marcos Perceived Temperature (F)
San Marcos Perceived Temperature (C)
Average San Marcos Temperatures by Month
Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
Precipitation (Rain or Snow)
If dry weather is what you’re after, the months with the lowest chance of significant precipitation in San Marcos are December, June, and then May. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early December. For example, on the week of December 3rd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early July with an average of 1 days of significant precipitation the week of July 2nd.
When can you find snow in San Marcos? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.
Chance of Precipitation
The graph below shows the % chance of rainy and snowy days in San Marcos.
Snow on the Ground
The graph below shows the average snow on the ground in San Marcos (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
Humidity and Wind
San Marcos has some comfortably humid months, with slightly drier months on the other side of the year. The least humid month is August (48.6% relative humidity), and the most humid month is May (56.1%).
Wind in San Marcos is usually moderate. The windiest month is March, followed by April and February. March’s average wind speed of around 9.3 knots (10.7 MPH or 17.3 KPH) is considered “a gentle breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late February and early March where average top sustained speeds reach 18.8 knots, which is considered a fresh breeze.
Relative Humidity (%)
The graph below shows the average % humidity by month in San Marcos.
The graph below shows wind speed (max and average) in knots.
Average Wind Speeds
Show Wind Speeds
All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.
|Month||Avg. Wind||Avg. Wind Feel||Sustained High Wind||High Wind Feel|
|Jan||8.3||Gentle breeze||16.2||Significant breeze|
|Feb||9.1||Gentle breeze||17.1||Strong breeze|
|Mar||9.3||Gentle breeze||17.8||Significant breeze|
|Apr||9.3||Gentle breeze||17.5||Strong breeze|
|May||8.8||Gentle breeze||16.5||Significant breeze|
|Jun||8.2||Gentle breeze||15.6||Significant breeze|
|Jul||7.1||Gentle breeze||15.2||Significant breeze|
|Aug||6.9||Light breeze||14.8||Significant breeze|
|Sep||6.2||Light breeze||14.1||Significant breeze|
|Oct||7.1||Gentle breeze||14.1||Significant breeze|
|Nov||7.6||Gentle breeze||15.1||Significant breeze|
|Dec||7.9||Gentle breeze||15.7||Significant breeze|
Show Relative Humidity by Month
|Month||Avg. Relative Humidity|
Is it Safe to Travel to San Marcos?
Our best data indicates this area is generally safe. As of Oct 07, 2019 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Sep 23, 2019.
The Busiest and Least Crowded Months
The busiest month for tourism in San Marcos, TX, US is July, followed by March and June. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit San Marcos in November. Those willing to visit at these times will likely find it the least expensive month.
Estimated Tourism by Month
Most Popular Months to Visit
Overall San Marcos Travel Experience by Season
Spring (March through May)
Humidity and temperatures combine to make this season feel warm. Highs range from 91.9°F (33.3°C) and 70.5°F (21.4°C) with warmer temperatures in the later months. Rain is rare with 2 to 3 days of significant precipitation per month. Spring is the busiest for tourism, which makes it a good time for those looking for things to do.
Summer (June through August)
The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see the least precipitation with 1 to 3 days of precipitation per month. June – August is the second busiest season for tourism in San Marcos, so lodging and other accommodations may cost slightly more.
Fall (September through November)
Fall daily highs range from 95.2°F (35.1°C) and 67.6°F (19.8°C), which will feel very nice given the humidity and wind. It rains or snows a normal amount: 2 to 3 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.
Winter (December through February)
Weather is too cold this time of year in San Marcos to be enjoyable for warm weather travelers. The average high during this season is between 72.8°F (22.7°C) and 60.3°F (15.7°C). On average, it rains or snows a smalll amount: 1 to 4 times per month. These times of year are fairly slow with tourists.