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Current weather in San Juan is few clouds.

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Weather data for San Juan is updated regularly with the latest available observations and forecasts.

Now · 8:03 PM

San Juan Weather & Hourly Forecast

United States · Texas · 78584

92°F

Mostly clear night

Feels like: 92°F

💧 Humidity 48% 🌡 Pressure 29.83 inHg 💨 Wind 14 mph 👁 Visibility 31.6 mi ☁ Clouds 19% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for San Juan

Today

9:00 PM

Clear night

90° 💧 None 💨 15 mph H 54%29.85 inHg

Tomorrow

12:00 AM

Clear night

84° 💧 None 💨 12 mph H 73%29.94 inHg

3:00 AM

Clear night

82° 💧 None 💨 10 mph H 83%29.91 inHg

6:00 AM

Clear night

81° 💧 None 💨 8 mph H 86%29.94 inHg

9:00 AM

Sunny

84° 💧 0.000 in 💨 10 mph H 76%29.97 inHg

12:00 PM

Sunny

95° 💧 0.000 in 💨 10 mph H 46%29.97 inHg

3:00 PM

Sunny

102° 💧 0.000 in 💨 9 mph H 32%29.88 inHg

6:00 PM

Light rain

92° 💧 0.029 in 💨 15 mph H 49%29.88 inHg

9:00 PM

Clear night

89° 💧 None 💨 14 mph H 56%29.94 inHg

Wednesday

12:00 AM

Mostly clear night

84° 💧 None 💨 10 mph H 71%30.00 inHg

3:00 AM

Clear night

81° 💧 None 💨 9 mph H 83%30.00 inHg

6:00 AM

Clear night

79° 💧 None 💨 7 mph H 88%30.00 inHg

9:00 AM

Mostly sunny

83° 💧 None 💨 8 mph H 77%30.06 inHg

12:00 PM

Partly cloudy

94° 💧 None 💨 7 mph H 48%30.06 inHg

3:00 PM

Mostly sunny

101° 💧 0.000 in 💨 7 mph H 36%29.94 inHg

6:00 PM

Sunny

100° 💧 0.011 in 💨 11 mph H 35%29.85 inHg

Today

9:00 PM

Clear night

90° 💧 None 💨 15 mph H 54%29.85 inHg

10:00 PM

Clear night

87° 💧 None 💨 14 mph H 61%29.91 inHg

11:00 PM

Clear night

86° 💧 None 💨 13 mph H 67%29.91 inHg

Tomorrow

12:00 AM

Clear night

84° 💧 None 💨 12 mph H 73%29.94 inHg

1:00 AM

Clear night

83° 💧 None 💨 11 mph H 77%29.94 inHg

2:00 AM

Clear night

83° 💧 None 💨 11 mph H 80%29.91 inHg

3:00 AM

Clear night

82° 💧 None 💨 10 mph H 83%29.91 inHg

4:00 AM

Clear night

82° 💧 None 💨 10 mph H 84%29.91 inHg

5:00 AM

Clear night

81° 💧 None 💨 8 mph H 85%29.91 inHg

6:00 AM

Clear night

81° 💧 None 💨 8 mph H 86%29.94 inHg

7:00 AM

Clear night

81° 💧 None 💨 8 mph H 87%29.94 inHg

8:00 AM

Sunny

81° 💧 None 💨 8 mph H 85%29.94 inHg

9:00 AM

Sunny

84° 💧 None 💨 10 mph H 76%29.97 inHg

10:00 AM

Sunny

88° 💧 None 💨 10 mph H 65%29.97 inHg

11:00 AM

Sunny

92° 💧 0.000 in 💨 11 mph H 54%29.97 inHg

12:00 PM

Sunny

95° 💧 None 💨 10 mph H 46%29.97 inHg

1:00 PM

Sunny

98° 💧 None 💨 9 mph H 39%29.94 inHg

2:00 PM

Sunny

100° 💧 0.000 in 💨 9 mph H 35%29.91 inHg

3:00 PM

Sunny

102° 💧 None 💨 9 mph H 32%29.88 inHg

4:00 PM

Mostly sunny

102° 💧 None 💨 9 mph H 31%29.88 inHg

5:00 PM

Mostly sunny

102° 💧 0.000 in 💨 11 mph H 31%29.85 inHg

6:00 PM

Light rain

92° 💧 0.028 in 💨 15 mph H 49%29.88 inHg

7:00 PM

Sunny

93° 💧 0.001 in 💨 17 mph H 46%29.91 inHg

8:00 PM

Clear night

90° 💧 None 💨 13 mph H 51%29.94 inHg

9:00 PM

Clear night

89° 💧 None 💨 14 mph H 56%29.94 inHg

10:00 PM

Clear night

87° 💧 None 💨 13 mph H 63%29.97 inHg

11:00 PM

Clear night

85° 💧 None 💨 10 mph H 67%30.00 inHg

Wednesday

12:00 AM

Mostly clear night

84° 💧 None 💨 10 mph H 71%30.00 inHg

1:00 AM

Clear night

83° 💧 None 💨 10 mph H 76%30.00 inHg

2:00 AM

Clear night

82° 💧 None 💨 10 mph H 81%30.00 inHg

3:00 AM

Clear night

81° 💧 None 💨 9 mph H 83%30.00 inHg

4:00 AM

Clear night

80° 💧 None 💨 8 mph H 85%30.00 inHg

5:00 AM

Clear night

80° 💧 None 💨 7 mph H 86%30.00 inHg

6:00 AM

Clear night

79° 💧 None 💨 7 mph H 88%30.00 inHg

7:00 AM

Mostly clear night

79° 💧 None 💨 7 mph H 89%30.00 inHg

8:00 AM

Mostly sunny

80° 💧 None 💨 7 mph H 87%30.03 inHg

9:00 AM

Mostly sunny

83° 💧 None 💨 8 mph H 77%30.06 inHg

10:00 AM

Sunny

87° 💧 None 💨 7 mph H 67%30.06 inHg

11:00 AM

Sunny

91° 💧 None 💨 7 mph H 56%30.06 inHg

12:00 PM

Partly cloudy

94° 💧 None 💨 7 mph H 48%30.06 inHg

1:00 PM

Partly cloudy

97° 💧 None 💨 6 mph H 42%30.03 inHg

2:00 PM

Mostly sunny

100° 💧 None 💨 6 mph H 38%29.97 inHg

3:00 PM

Mostly sunny

101° 💧 0.000 in 💨 7 mph H 36%29.94 inHg

4:00 PM

Partly cloudy

101° 💧 0.000 in 💨 8 mph H 34%29.91 inHg

5:00 PM

Mostly sunny

101° 💧 0.000 in 💨 8 mph H 34%29.88 inHg

6:00 PM

Sunny

100° 💧 0.000 in 💨 11 mph H 35%29.85 inHg

7:00 PM

Light thunderstorms

90° 💧 0.011 in 💨 15 mph H 54%29.88 inHg

8:00 PM

Clear night

91° 💧 0.000 in 💨 12 mph H 52%29.91 inHg

9:00 PM

Clear night

90° 💧 None 💨 11 mph H 53%29.91 inHg

10:00 PM

Clear night

88° 💧 None 💨 13 mph H 58%29.94 inHg

11:00 PM

Clear night

85° 💧 None 💨 13 mph H 67%29.97 inHg

Thursday

12:00 AM

Clear night

84° 💧 None 💨 10 mph H 73%30.00 inHg

1:00 AM

Clear night

82° 💧 None 💨 8 mph H 77%29.97 inHg

2:00 AM

Clear night

82° 💧 None 💨 8 mph H 80%29.97 inHg

3:00 AM

Clear night

81° 💧 None 💨 8 mph H 82%29.97 inHg

4:00 AM

Clear night

81° 💧 None 💨 8 mph H 83%29.94 inHg

5:00 AM

Clear night

80° 💧 None 💨 8 mph H 84%29.94 inHg

6:00 AM

Clear night

80° 💧 None 💨 8 mph H 85%29.94 inHg

7:00 AM

Clear night

80° 💧 None 💨 6 mph H 85%29.97 inHg

4:00 PM

Mostly sunny

102° 💧 None 💨 6 mph H 29%29.83 inHg

7:00 PM

Light rain

92° 💧 None 💨 17 mph H 47%29.80 inHg

10:00 PM

Clear night

89° 💧 None 💨 12 mph H 56%29.88 inHg

Friday

1:00 AM

Mostly clear night

84° 💧 None 💨 11 mph H 74%29.88 inHg

4:00 AM

Clear night

82° 💧 None 💨 9 mph H 79%29.85 inHg

7:00 AM

Clear night

82° 💧 None 💨 8 mph H 75%29.85 inHg

10:00 AM

Sunny

89° 💧 None 💨 8 mph H 58%29.88 inHg

1:00 PM

Mostly sunny

99° 💧 None 💨 8 mph H 38%29.83 inHg

4:00 PM

Mostly sunny

103° 💧 None 💨 10 mph H 30%29.71 inHg

7:00 PM

Mostly sunny

97° 💧 None 💨 15 mph H 36%29.68 inHg

10:00 PM

Mostly clear night

90° 💧 None 💨 16 mph H 57%29.77 inHg

Saturday

1:00 AM

Clear night

85° 💧 None 💨 12 mph H 73%29.80 inHg

4:00 AM

Clear night

84° 💧 None 💨 11 mph H 74%29.77 inHg

7:00 AM

Clear night

82° 💧 None 💨 10 mph H 75%29.80 inHg

10:00 AM

Sunny

89° 💧 None 💨 12 mph H 59%29.83 inHg

1:00 PM

Sunny

99° 💧 None 💨 11 mph H 40%29.80 inHg

4:00 PM

Mostly sunny

105° 💧 None 💨 12 mph H 30%29.71 inHg

7:00 PM

Mostly sunny

98° 💧 None 💨 17 mph H 37%29.68 inHg

10:00 PM

Mostly clear night

88° 💧 None 💨 18 mph H 61%29.80 inHg

Sunday

1:00 AM

Clear night

84° 💧 None 💨 15 mph H 72%29.83 inHg

4:00 AM

Clear night

83° 💧 None 💨 12 mph H 73%29.80 inHg

7:00 AM

Clear night

82° 💧 None 💨 12 mph H 76%29.80 inHg

10:00 AM

Mostly sunny

90° 💧 None 💨 17 mph H 58%29.85 inHg

1:00 PM

Mostly sunny

100° 💧 None 💨 15 mph H 37%29.83 inHg

7:00 PM

Mostly sunny

100° 💧 None 💨 15 mph H 37%29.85 inHg

Monday

1:00 AM

Mostly clear night

95° 💧 None 💨 18 mph H 45%29.77 inHg

7:00 AM

Clear night

84° 💧 None 💨 15 mph H 73%29.88 inHg

1:00 PM

Sunny

81° 💧 None 💨 12 mph H 82%29.85 inHg

7:00 PM

Sunny

101° 💧 None 💨 15 mph H 34%29.85 inHg

Tuesday

1:00 AM

Clear night

97° 💧 None 💨 17 mph H 37%29.77 inHg

7:00 AM

Clear night

84° 💧 None 💨 14 mph H 75%29.91 inHg

1:00 PM

Sunny

80° 💧 None 💨 10 mph H 84%29.91 inHg

7:00 PM

Sunny

100° 💧 None 💨 11 mph H 33%29.94 inHg

Wednesday

1:00 AM

Mostly clear night

95° 💧 None 💨 20 mph H 40%29.88 inHg

7:00 AM

Clear night

84° 💧 None 💨 11 mph H 72%30.03 inHg

1:00 PM

Mostly sunny

81° 💧 None 💨 6 mph H 86%30.03 inHg

7:00 PM

Partly cloudy

97° 💧 None 💨 6 mph H 41%30.06 inHg

Thursday

1:00 AM

Overcast night

88° 💧 None 💨 14 mph H 59%29.97 inHg

7:00 AM

Mostly clear night

83° 💧 None 💨 6 mph H 72%30.06 inHg

1:00 PM

Sunny

79° 💧 None 💨 4 mph H 86%30.03 inHg

7:00 PM

Mostly sunny

94° 💧 None 💨 6 mph H 49%30.06 inHg

Friday

1:00 AM

Overcast night

86° 💧 None 💨 11 mph H 65%29.97 inHg

7:00 AM

Light rain

81° 💧 None 💨 5 mph H 80%30.00 inHg

1:00 PM

Mostly sunny

78° 💧 None 💨 3 mph H 90%30.00 inHg

7:00 PM

Partly cloudy

92° 💧 None 💨 4 mph H 53%30.00 inHg

Saturday

1:00 AM

Overcast night

80° 💧 None 💨 8 mph H 86%29.91 inHg

7:00 AM

Light rain

77° 💧 None 💨 7 mph H 93%29.97 inHg

1:00 PM

Mostly sunny

76° 💧 None 💨 4 mph H 98%29.94 inHg

7:00 PM

Light rain

90° 💧 None 💨 7 mph H 58%29.94 inHg

Sunday

1:00 AM

Moderate rain

78° 💧 None 💨 7 mph H 90%29.88 inHg

7:00 AM

Overcast night

78° 💧 None 💨 8 mph H 96%29.94 inHg

1:00 PM

Mostly sunny

76° 💧 None 💨 6 mph H 98%29.91 inHg

7:00 PM

Mostly sunny

91° 💧 None 💨 8 mph H 56%29.94 inHg

Monday

1:00 AM

Mostly clear night

87° 💧 None 💨 13 mph H 65%29.85 inHg

7:00 AM

Clear night

80° 💧 None 💨 9 mph H 85%29.94 inHg

1:00 PM

Sunny

76° 💧 None 💨 6 mph H 96%29.91 inHg

7:00 PM

Sunny

92° 💧 None 💨 9 mph H 50%29.91 inHg

Tuesday

1:00 AM

Clear night

91° 💧 None 💨 11 mph H 53%29.80 inHg

7:00 AM

Mostly cloudy night

80° 💧 None 💨 11 mph H 84%29.88 inHg

1:00 PM

Partly cloudy

78° 💧 None 💨 9 mph H 91%29.83 inHg

In San Juan and, more broadly, across the state of Texas: The evening will be mostly cloudy with very hot temperatures around 92 to 95 degrees Fahrenheit. Light southeast winds will persist, averaging up to 9 mph with gusts reaching 18 mph. There is a slight chance of rain, with about 0.01 inches possible, and the highest probability of precipitation occurring during the next few hours. Expect humid conditions and the potential for brief, light showers as the evening progresses. Temperatures are likely to remain steady or slightly decrease as night falls. Be prepared for warm and potentially unsettled weather throughout the evening.

15-Day Weather Outlook for San Juan

Wednesday, Sep 9Wed Sep 9

Mostly sunny 101°/79° 💧 None 💨 17 mph

Thursday, Sep 10Thu Sep 10

Light thunderstorms 102°/80° 💧 0.047 in 💨 15 mph

Friday, Sep 11Fri Sep 11

Light rain 103°/82° 💧 0.017 in 💨 17 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 105°/82° 💧 0.001 in 💨 16 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 100°/82° 💧 0.001 in 💨 18 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 100°/81° 💧 0.020 in 💨 18 mph

Tuesday, Sep 15Tue Sep 15

Sunny 101°/80° 💧 0.000 in 💨 17 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 100°/81° 💧 0.015 in 💨 20 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 97°/79° 💧 0.069 in 💨 14 mph

Friday, Sep 18Fri Sep 18

Light rain 94°/78° 💧 0.053 in 💨 11 mph

Saturday, Sep 19Sat Sep 19

Light rain 92°/76° 💧 0.288 in 💨 8 mph

Sunday, Sep 20Sun Sep 20

Moderate rain 90°/76° 💧 0.462 in 💨 8 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 91°/76° 💧 0.007 in 💨 13 mph

Tuesday, Sep 22Tue Sep 22

Mostly cloudy 92°/78° 💧 None 💨 11 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in San Juan

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for San Juan

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 9:00 PM

PM2.5 Fine particles Good 0,8µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 1,0µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 37,4µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,8µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in San Juan

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 10,6Very high 😊Good

Tomorrow UV 10,5Very high 😊Good

Wednesday UV 10,6Very high 😊Good

Thursday UV 10,5Very high 😊Good

Friday UV 10,1Very high 😊Good

Saturday UV 9,0Very high —Unavailable

Sunday UV 9,0Very high —Unavailable

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

High heat

Stay hydrated and avoid intense exercise during the hottest part of the day.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for San Juan

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · SAN JUAN, TEXAS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 4:00 AM–5:00 AM.

99/100Best-hour score

BEST TIME TONIGHT 4:00 AM–5:00 AM Astronomical darkness: 9:07 PM–6:00 AM

☁ Cloud cover 1% Real hourly forecast for the best viewing hour.

☾ Moonlight 13% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 66° high at the best hour.

✦ Estimated visible meteors 2–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min78%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for San Juan were last refreshed today at 8:03 PM. The current forecast period extends through 09/09/2026 at 6:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.