Climate and monthly weather forecastSan Juan, TX
Climate and monthly weather forecast
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
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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.
Throughout the year, there are 94.1 rainfall days, and 9.06" (230mm) of precipitation is accumulated.
January is the only month when snow falls.
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.
Throughout the year, there are 0.1 snowfall days, and 0.12" (3mm) of snow is accumulated.
In San Juan, snow does not fall in February through December.
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.
With an average relative humidity of 69%, May is the most humid month.
The month with the longest days is June, with an average of 13h and 48min of daylight.
July has the most sunshine of the year in San Juan, with an average of 11.4h of sunshine.
The months with the highest UV index are July and August, with an average maximum UV index of 8.
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.
August is the least humid month, with an average relative humidity of 59%.
September is the month with the most rainfall. Rain falls for 15.1 days and accumulates 1.46" (37mm) of precipitation.
With an average of 10h and 30min of daylight, December has the shortest days of the year.
With an average of 5.5h of sunshine, December has the least sunshine of the year.
With an average maximum UV index of 4, December is the month with the lowest UV index.
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 in January:
30.12"Hg - Average pressure in February:
30.03"Hg - Average pressure in March:
29.99"Hg - Average pressure in April:
29.89"Hg - Average pressure in May:
29.87"Hg - Average pressure in June:
29.87"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.91"Hg - Average pressure in October:
29.96"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.07"Hg
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 in January:
9.5mph - Average wind speed in February:
10.7mph - Average wind speed in March:
11.9mph - Average wind speed in April:
12.1mph - Average wind speed in May:
12.4mph - Average wind speed in June:
11.2mph
- Average wind speed in July:
12.2mph - Average wind speed in August:
10.9mph - Average wind speed in September:
8.9mph - Average wind speed in October:
9.3mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.5mph
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 humidity
San Juan, TX
The month with the highest relative humidity is May (69%).
The month with the lowest relative humidity is August (59%).
Average rainfall
San Juan, TX
- Average rainfall in January:
0.31" - Average rainfall in February:
0.31" - Average rainfall in March:
0.39" - Average rainfall in April:
0.39" - Average rainfall in May:
0.98" - Average rainfall in June:
1.26"
- Average rainfall in July:
1.34" - Average rainfall in August:
0.71" - Average rainfall in September:
1.46" - Average rainfall in October:
0.79" - Average rainfall in November:
0.63" - Average rainfall in December:
0.47"
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 in January:
6.3 days - Average rainfall days in February:
5.4 days - Average rainfall days in March:
6.8 days - Average rainfall days in April:
7.3 days - Average rainfall days in May:
8 days - Average rainfall days in June:
9.3 days
- Average rainfall days in July:
6.5 days - Average rainfall days in August:
6.9 days - Average rainfall days in September:
15.1 days - Average rainfall days in October:
8.7 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
6.3 days
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
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 in January:
0.1 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0 days
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 in January:
10h and 42min - Average daylight in February:
11h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 48min - Average daylight in May:
13h and 24min - Average daylight in June:
13h and 48min
- Average daylight in July:
13h and 36min - Average daylight in August:
13h and 0min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 30min - Average daylight in November:
10h and 54min - Average daylight in December:
10h and 30min
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).
- Average sunshine in January:
6h and 48min - Average sunshine in February:
7h and 30min - Average sunshine in March:
7h and 48min - Average sunshine in April:
8h and 18min - Average sunshine in May:
10h and 0min - Average sunshine in June:
11h and 0min
- Average sunshine in July:
11h and 24min - Average sunshine in August:
9h and 48min - Average sunshine in September:
8h and 36min - Average sunshine in October:
7h and 54min - Average sunshine in November:
5h and 48min - Average sunshine in December:
5h 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 in January:
22.5 days - Average sunshine days in February:
21 days - Average sunshine days in March:
22.5 days - Average sunshine days in April:
21.2 days - Average sunshine days in May:
20.5 days - Average sunshine days in June:
19.3 days
- Average sunshine days in July:
23 days - Average sunshine days in August:
22.9 days - Average sunshine days in September:
12.5 days - Average sunshine days in October:
20.6 days - Average sunshine days in November:
20.1 days - Average sunshine days in December:
22.5 days
The month with the most sunshine days is July (23 days).
The month with the least sunshine days is September (12.5 days).
Average UV index
San Juan, TX
The months with the highest UV index are July and August (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover
San Juan, TX
The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 18).
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).
