Climate and monthly weather forecast
San Juan, TX

Share

Weather in January

January, like December, is another pleasant winter month in San Juan, Texas, with an average temperature ranging between min 53.4°F (11.9°C) and max 69.6°F (20.9°C). With average high and low temperatures of 69.6°F (20.9°C) and 53.4°F (11.9°C) respectively, January is San Juan's coldest month. Weather in January »

Weather in February

The last month of the winter, February, is a warm month in San Juan, Texas, with temperature in the range of an average high of 75.4°F (24.1°C) and an average low of 57.9°F (14.4°C). Entering February, San Juan notices a subtle temperature elevation, with the average high-temperature advancing from January's agreeable 69.6°F (20.9°C) to a moderately hot 75.4°F (24.1°C). Weather in February »

Weather in March

The first month of the spring, March, is still a warm month in San Juan, Texas, with an average temperature varying between 82°F (27.8°C) and 63.1°F (17.3°C). San Juan's March weather indicates a minor increase in high-temperatures, edging from February's 75.4°F (24.1°C) to a still moderately hot 82°F (27.8°C). Weather in March »

Weather in April

April in San Juan, Texas, is a hot spring month, with an average temperature ranging between min 68.4°F (20.2°C) and max 88.3°F (31.3°C). San Juan's transition into April is marked by a minor temperature shift, moving from a warm 82°F (27.8°C) in March to a hot 88.3°F (31.3°C). Weather in April »

Weather in May

May, the last month of the spring in San Juan, is also a hot month, with an average temperature varying between 72.9°F (22.7°C) and 91.8°F (33.2°C). On the advent of May, San Juan's average high-temperature exhibits a minor adjustment to a still hot 91.8°F (33.2°C) from April's 88.3°F (31.3°C). Weather in May »

Weather in June

June, the first month of the summer in San Juan, is a fiery hot month, with temperature in the range of an average high of 95.5°F (35.3°C) and an average low of 76.6°F (24.8°C). With the advent of June, San Juan experiences an average high-temperature of a torrid 95.5°F (35.3°C), mirroring a close resemblance to the previous month. Weather in June »

Weather in July

July, like June, in San Juan, Texas, is a very hot summer month, with temperature in the range of an average high of 97.3°F (36.3°C) and an average low of 77.5°F (25.3°C). July's arrival brings an average high-temperature of a still very hot 97.3°F (36.3°C), slightly deviating from June's 95.5°F (35.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also a fiery hot month in San Juan, Texas, with an average temperature fluctuating between 79.7°F (26.5°C) and 98.2°F (36.8°C). August, with average temperatures reaching a high of 98.2°F (36.8°C) and a low of 79.7°F (26.5°C), is the warmest month. In August, the heat index is appraised at a blazing hot 122°F (50°C). Weather in August »

Weather in September

September, the first month of the autumn in San Juan, is still a hot month, with temperature in the range of an average high of 92.5°F (33.6°C) and an average low of 77.2°F (25.1°C). A minor decrease in the average high-temperature is observed during September, shifting from a very hot 98.2°F (36.8°C) in August to a tropical 92.5°F (33.6°C). Weather in September »

Weather in October

October, the same as September, in San Juan, Texas, is another hot autumn month, with an average temperature ranging between min 70.7°F (21.5°C) and max 87.3°F (30.7°C). San Juan records an average high-temperature of a still tropical 87.3°F (30.7°C) as October arrives, nearly mirroring the previous month's climate. Weather in October »

Weather in November

The last month of the autumn, November, is also a moderately hot month in San Juan, Texas, with an average temperature fluctuating between 77.7°F (25.4°C) and 61.9°F (16.6°C). The onset of November brings a small change in high-temperatures, falling from a hot 87.3°F (30.7°C) in October to a moderately hot 77.7°F (25.4°C). Weather in November »

Weather in December

The first month of the winter, December, is also an agreeable month in San Juan, Texas, with temperature in the range of an average high of 71.4°F (21.9°C) and an average low of 56.1°F (13.4°C). December's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a moderately hot 77.7°F (25.4°C) in November to an agreeable 71.4°F (21.9°C). Weather in December »
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest?

January tends to be the coldest month, with temperatures averaging a daily high of 69.6°F (20.9°C) and a low of 53.4°F (11.9°C).

What is the driest month?

January and February are months with the least rain when the rain falls for 6.3 days and typically aggregates up to 0.31" (8mm) of rain.

How many days does it rain?

Throughout the year, there are 94.1 rainfall days, and 9.06" (230mm) of precipitation is accumulated.

When does it snow?

January is the only month when snow falls.

What is the snowiest month?

The month with the most snowfall in San Juan is January, when snow falls for 0.1 days and typically aggregates up to 0.12" (3mm) of snow.

How much does it snow in San Juan?

Throughout the year, there are 0.1 snowfall days, and 0.12" (3mm) of snow is accumulated.

When it does not snow in San Juan?

In San Juan, snow does not fall in February through December.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the most humid month?

With an average relative humidity of 69%, May is the most humid month.

When are the longest days?

The month with the longest days is June, with an average of 13h and 48min of daylight.

What month has the most sunshine?

July has the most sunshine of the year in San Juan, with an average of 11.4h of sunshine.

When is the highest UV index?

The months with the highest UV index are July and August, with an average maximum UV index of 8.

What month is the hottest?

August, with average temperatures reaching a high of 98.2°F (36.8°C) and a low of 79.7°F (26.5°C), is the warmest month.

What is the least humid month?

August is the least humid month, with an average relative humidity of 59%.

What is the wettest month?

September is the month with the most rainfall. Rain falls for 15.1 days and accumulates 1.46" (37mm) of precipitation.

What is the month with the shortest days?

With an average of 10h and 30min of daylight, December has the shortest days of the year.

What is the month with the least sunshine?

With an average of 5.5h of sunshine, December has the least sunshine of the year.

When is the lowest UV index?

With an average maximum UV index of 4, December is the month with the lowest UV index.

Average temperature
San Juan, TX

Average temperature - San Juan, TX

The warmest month (with the highest average high temperature) is August (98.2°F).
The month with the lowest average high temperature is January (69.6°F).

The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (53.4°F).

Average pressure
San Juan, TX

Average pressure - San Juan, TX

The month with the highest atmospheric pressure is January (30.12"Hg).
The months with the lowest atmospheric pressure are May and June (29.87"Hg).

Average wind speed
San Juan, TX

Average wind speed - San Juan, TX

The windiest month (with the highest average wind speed) is May (12.4mph).
The calmest month (with the lowest average wind speed) is September (8.9mph).

Average rainfall
San Juan, TX

Average rainfall - San Juan, TX

The wettest month (with the highest rainfall) is September (1.46").
The driest months (with the least rainfall) are January and February (0.31").

Average rainfall days
San Juan, TX

Average rainfall days - San Juan, TX

The month with the highest number of rainy days is September (15.1 days).
The month with the least rainy days is February (5.4 days).

Average snowfall
San Juan, TX

Average snowfall - San Juan, TX

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

Average snowfall days
San Juan, TX

Average snowfall days - San Juan, TX

The month with the highest number of snowfall days is January (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight / Average sunshine
San Juan, TX

Average daylight / Average sunshine - San Juan, TX

The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

Average sunshine days
San Juan, TX

Average sunshine days - San Juan, TX

The month with the most sunshine days is July (23 days).
The month with the least sunshine days is September (12.5 days).

Average visibility
San Juan, TX

Average visibility - San Juan, TX

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

San Juan, Texas, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location