January 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).

Temperature

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).

Humidity

In San Marcos, the average relative humidity in January is 67%.

Rainfall

In San Marcos, in January, during 9.4 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In San Marcos, during the entire year, the rain falls for 151.8 days and collects up to 26.89" (683mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in January is 10h and 29min.
On the first day of January, sunrise is at 7:27 am and sunset at 5:43 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 6:08 pm CST.

Sunshine

In San Marcos, the average sunshine in January is 6.2h.

UV index

The average daily maximum UV index in January is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 in January interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in San Marcos?

The coldest month in San Marcos, Texas, 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).

What is the temperature in January in San Marcos?

The average high-temperature, in January, in San Marcos, is 59.9°F (15.5°C), while the average low-temperature is 42.8°F (6°C).

What is the average humidity in January in San Marcos?

In San Marcos, Texas, the average relative humidity in January is 67%.

How much does it rain in San Marcos in January?

In San Marcos, in January, it is raining for 9.4 days, with typically 1.38" (35mm) of accumulated precipitation.

When does it snow the most in San Marcos?

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

How many days does it snow in January in San Marcos?

In San Marcos, in January, during 0.3 snowfall days, 0.12" (3mm) of snow is typically accumulated.

How many hours of daylight does San Marcos have in January?

The average day length in January in San Marcos is 10h and 29min.

When is the sunrise / sunset in January in San Marcos?

On the first day of January in San Marcos, Texas, sunrise is at 7:27 am and sunset at 5:43 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 6:08 pm CST.

How long on average sun shines in January in San Marcos?

The average sunshine duration in January in San Marcos is 6.2h.

How high is the UV index in January in San Marcos?

In January, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
San Marcos, TX

Average temperature in January - San Marcos, TX
  • Average high temperature in January: 59.9°F

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).

  • Average low temperature in January: 42.8°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 in January
San Marcos, TX

Average pressure in January - San Marcos, TX
  • Average pressure in January: 30.15"Hg

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 in January
San Marcos, TX

Average wind speed in January - San Marcos, TX
  • Average wind speed in January: 8.4mph

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 humidity in January
San Marcos, TX

Average humidity in January - San Marcos, TX
  • Average humidity in January: 67%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is August (62%).

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Average rainfall in January
San Marcos, TX

Average rainfall in January - San Marcos, TX
  • Average rainfall in January: 1.38"

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 in January
San Marcos, TX

Average rainfall days in January - San Marcos, TX
  • Average rainfall days in January: 9.4 days

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 in January
San Marcos, TX

Average snowfall in January - San Marcos, TX
  • Average snowfall in January: 0.12"

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 in January
San Marcos, TX

Average snowfall days in January - San Marcos, TX
  • Average snowfall days in January: 0.3 days

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 in January /
Average sunshine in January
San Marcos, TX

Average daylight in January / Average sunshine in January - San Marcos, TX
  • Average daylight in January: 10h and 29min

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).

  • Average sunshine in January: 6h and 12min

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 in January
San Marcos, TX

Average sunshine days in January - San Marcos, TX
  • Average sunshine days in January: 19.4 days

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 UV index in January
San Marcos, TX

Average UV index in January - San Marcos, TX
  • Average UV index in January: 4

The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in January
San Marcos, TX

Average cloud cover in January - San Marcos, TX
  • Average cloud cover in January: 37

The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in January
San Marcos, TX

Average visibility in January - San Marcos, TX
  • Average visibility in January: 6mi

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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