Climate and monthly weather forecast
San Marcos, TX

Weather in January

January, like December, is a moderate winter month in San Marcos, Texas, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 42.8°F (6°C). The coldest month is January, with an average high-temperature of 59.9°F (15.5°C) and an average low-temperature of 42.8°F (6°C). Weather in January »

Weather in February

February, the last month of the winter in San Marcos, is a comfortable month, with an average temperature varying between 46.9°F (8.3°C) and 63.7°F (17.6°C). In San Marcos, the average high-temperature in February is relatively the same as in January - a comfortable 63.7°F (17.6°C). Weather in February »

Weather in March

March, the first month of the spring in San Marcos, is a pleasant month, with an average temperature varying between 70.9°F (21.6°C) and 53.1°F (11.7°C). In San Marcos, the average high-temperature in March slightly increases from an enjoyable 63.7°F (17.6°C) in February to an agreeable 70.9°F (21.6°C). Weather in March »

Weather in April

April in San Marcos, Texas, is a warm spring month, with an average temperature varying between 58.6°F (14.8°C) and 77.5°F (25.3°C). In San Marcos, the average high-temperature in April marginally rises from an agreeable 70.9°F (21.6°C) in March to a warm 77.5°F (25.3°C). Weather in April »

Weather in May

The last month of the spring, May, is another warm month in San Marcos, Texas, with an average temperature varying between 65.8°F (18.8°C) and 83.8°F (28.8°C). In San Marcos, the average high-temperature in May marginally rises from a warm 77.5°F (25.3°C) in April to a still moderately hot 83.8°F (28.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a hot month in San Marcos, Texas, with an average temperature ranging between min 72°F (22.2°C) and max 90.7°F (32.6°C). In San Marcos, Texas, the average high-temperature in June slightly increases from a moderately hot 83.8°F (28.8°C) in May to a tropical 90.7°F (32.6°C). Weather in June »

Weather in July

July, like June, is another tropical summer month in San Marcos, Texas, with an average temperature varying between 94.3°F (34.6°C) and 73.8°F (23.2°C). In San Marcos, the average high-temperature in July is essentially the same as in June - a still tropical 94.3°F (34.6°C). Weather in July »

Weather in August

The last month of the summer, August, is a very hot month in San Marcos, Texas, with an average temperature varying between 95.9°F (35.5°C) and 74.7°F (23.7°C). With an average high-temperature of 95.9°F (35.5°C) and an average low-temperature of 74.7°F (23.7°C), August is the warmest month. The average heat index in August is calculated to be a life-threatening hot 118.4°F (48°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a tropical month in San Marcos, Texas, with temperature in the range of an average low of 70.5°F (21.4°C) and an average high of 88°F (31.1°C). In San Marcos, the average high-temperature in September marginally drops from a torrid 95.9°F (35.5°C) in August to a tropical 88°F (31.1°C). Weather in September »

Weather in October

October, the same as September, is another warm autumn month in San Marcos, Texas, with an average temperature ranging between max 79°F (26.1°C) and min 61°F (16.1°C). In October, the average high-temperature decreases from a hot 88°F (31.1°C) in September to a moderately hot 79°F (26.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is also an agreeable month in San Marcos, Texas, with temperature in the range of an average low of 51.8°F (11°C) and an average high of 68.2°F (20.1°C). In San Marcos, the average high-temperature in November drops from a warm 79°F (26.1°C) in October to a pleasant 68.2°F (20.1°C). Weather in November »

Weather in December

December, the first month of the winter in San Marcos, is still a mild month, with an average temperature varying between 45.5°F (7.5°C) and 60.4°F (15.8°C). In San Marcos, the average high-temperature in December slightly decreases from a pleasant 68.2°F (20.1°C) in November to a mild 60.4°F (15.8°C). Weather in December »
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FAQ

What is the coldest month in San Marcos?

The coldest month is January, with an average high-temperature of 59.9°F (15.5°C) and an average low-temperature of 42.8°F (6°C).

How much does it rain in San Marcos?

In San Marcos, during the entire year, the rain falls for 151.8 days and collects up to 26.89" (683mm) of precipitation.

When does it snow in San Marcos?

January, February and December are months with snowfall.

When does it snow the most in San Marcos?

The months with the most snowfall are January and February, with an average 0.12" (3mm) of accumulated snow.

How many days does it snow in San Marcos?

In San Marcos, during the entire year, snow falls for 0.7 days and aggregates up to 0.28" (7mm) of snow.

What is the driest month in San Marcos?

February is the month with the least rainfall in San Marcos, Texas. Rain falls for 11.3 days and accumulates 1.1" (28mm) of precipitation.

When it does not snow in San Marcos?

In San Marcos, snow does not fall in March through November.

When is Daylight Saving Time (DST) in San Marcos?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in San Marcos, Texas, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the most humid month in San Marcos?

With an average relative humidity of 77%, May is the most humid month in San Marcos.

What is the wettest month in San Marcos?

May is the month with the most rainfall in San Marcos. Rain falls for 16.6 days and accumulates 4.57" (116mm) of precipitation.

When are the longest days in San Marcos?

June has the longest days of the year in San Marcos, Texas, with an average of 14h and 2min of daylight.

What is the month with the highest UV index in San Marcos?

June through August, with an average maximum UV index of 7, are months with the highest UV index.

What are the months with the most sunshine in San Marcos?

The months with the most sunshine in San Marcos, Texas, are July and August, with an average of 10h of sunshine.

What is the warmest month in San Marcos?

With an average high-temperature of 95.9°F (35.5°C) and an average low-temperature of 74.7°F (23.7°C), August is the warmest month.

What is the least humid month in San Marcos?

With an average relative humidity of 62%, August is the least humid month.

What is the month with the shortest days in San Marcos?

The month with the shortest days in San Marcos is December, with an average of 10h and 16min of daylight.

What is the month with the least sunshine in San Marcos?

The month with the least sunshine in San Marcos, Texas, is December, with an average of 5.2h of sunshine.

What is the month with the lowest UV index in San Marcos?

December is the month with the lowest UV index in San Marcos, Texas, with an average maximum UV index of 3.

Average temperature
San Marcos, TX

Average temperature - San Marcos, TX

The warmest month (with the highest average high temperature) is August (95.9°F).
The month with the lowest average high temperature is January (59.9°F).

The month with the highest average low temperature is August (74.7°F).
The coldest month (with the lowest average low temperature) is January (42.8°F).

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Average pressure
San Marcos, TX

Average pressure - San Marcos, TX

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed
San Marcos, TX

Average wind speed - San Marcos, TX

The windiest month (with the highest average wind speed) is February (9.1mph).
The calmest month (with the lowest average wind speed) is September (6.1mph).

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Average rainfall
San Marcos, TX

Average rainfall - San Marcos, TX

The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is February (1.1").

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Average rainfall days
San Marcos, TX

Average rainfall days - San Marcos, TX

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (9.4 days).

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Average snowfall
San Marcos, TX

Average snowfall - San Marcos, TX

The months with the highest snowfall are January and February (0.12").
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0").

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Average snowfall days
San Marcos, TX

Average snowfall days - San Marcos, TX

The months with the highest number of snowfall days are January and February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).

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Average daylight / Average sunshine
San Marcos, TX

Average daylight / Average sunshine - San Marcos, TX

The month with the longest days is June (Average daylight: 14h and 2min).
The month with the shortest days is December (Average daylight: 10h and 16min).

The months with the most sunshine are July and August (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).

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Average sunshine days
San Marcos, TX

Average sunshine days - San Marcos, TX

The month with the most sunshine days is January (19.4 days).
The month with the least sunshine days is May (11.9 days).

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Average visibility
San Marcos, TX

Average visibility - San Marcos, TX

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

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