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Now · 2:42 PM

San Juan Weather & Hourly Forecast

United States · Texas · 78584

104°F

Mostly sunny

Feels like: 102°F

💧 Humidity 29% 🌡 Pressure 29.91 inHg 💨 Wind 13 mph 👁 Visibility 34.7 mi ☁ Clouds 33% ☀️ UV index 10.5 · Very high 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for San Juan

Today

3:00 PM

Mostly sunny

104° 💧 0.001 in 💨 13 mph H 29%29.91 inHg

6:00 PM

Overcast

98° 💧 None 💨 13 mph H 34%29.88 inHg

9:00 PM

Mostly cloudy night

90° 💧 None 💨 16 mph H 53%29.97 inHg

Tomorrow

12:00 AM

Clear night

85° 💧 None 💨 12 mph H 73%30.03 inHg

3:00 AM

Clear night

82° 💧 None 💨 9 mph H 79%30.00 inHg

6:00 AM

Mostly cloudy night

80° 💧 None 💨 8 mph H 85%30.00 inHg

9:00 AM

Mostly sunny

84° 💧 None 💨 7 mph H 76%30.03 inHg

12:00 PM

Sunny

96° 💧 0.000 in 💨 8 mph H 45%30.03 inHg

3:00 PM

Partly cloudy

102° 💧 0.001 in 💨 8 mph H 33%29.94 inHg

6:00 PM

Light thunderstorms

89° 💧 0.028 in 💨 15 mph H 60%29.91 inHg

9:00 PM

Mostly clear night

89° 💧 None 💨 12 mph H 53%29.94 inHg

Thursday

12:00 AM

Clear night

85° 💧 None 💨 12 mph H 68%30.00 inHg

3:00 AM

Clear night

82° 💧 0.000 in 💨 9 mph H 79%29.97 inHg

6:00 AM

Clear night

80° 💧 None 💨 6 mph H 84%29.94 inHg

9:00 AM

Sunny

84° 💧 0.001 in 💨 8 mph H 74%30.00 inHg

12:00 PM

Strong thunderstorm

94° 💧 0.002 in 💨 6 mph H 47%29.97 inHg

Today

3:00 PM

Mostly sunny

104° 💧 None 💨 13 mph H 29%29.91 inHg

4:00 PM

Strong thunderstorm

101° 💧 0.001 in 💨 16 mph H 31%29.88 inHg

5:00 PM

Strong thunderstorm

99° 💧 0.000 in 💨 14 mph H 34%29.88 inHg

6:00 PM

Overcast

98° 💧 None 💨 13 mph H 34%29.88 inHg

7:00 PM

Overcast

96° 💧 None 💨 15 mph H 38%29.88 inHg

8:00 PM

Overcast night

93° 💧 None 💨 16 mph H 47%29.91 inHg

9:00 PM

Mostly cloudy night

90° 💧 None 💨 16 mph H 53%29.97 inHg

10:00 PM

Mostly cloudy night

88° 💧 None 💨 16 mph H 60%30.00 inHg

11:00 PM

Mostly clear night

86° 💧 None 💨 13 mph H 69%30.00 inHg

Tomorrow

12:00 AM

Clear night

85° 💧 None 💨 12 mph H 73%30.03 inHg

1:00 AM

Clear night

84° 💧 None 💨 12 mph H 74%30.03 inHg

2:00 AM

Clear night

83° 💧 None 💨 9 mph H 76%30.00 inHg

3:00 AM

Clear night

82° 💧 None 💨 9 mph H 79%30.00 inHg

4:00 AM

Clear night

81° 💧 None 💨 8 mph H 81%30.00 inHg

5:00 AM

Partly cloudy night

81° 💧 None 💨 8 mph H 83%30.00 inHg

6:00 AM

Mostly cloudy night

80° 💧 None 💨 8 mph H 85%30.00 inHg

7:00 AM

Mostly cloudy night

80° 💧 None 💨 7 mph H 86%30.03 inHg

8:00 AM

Mostly cloudy

81° 💧 None 💨 7 mph H 84%30.03 inHg

9:00 AM

Mostly sunny

84° 💧 None 💨 7 mph H 76%30.03 inHg

10:00 AM

Sunny

88° 💧 None 💨 7 mph H 65%30.03 inHg

11:00 AM

Sunny

92° 💧 None 💨 7 mph H 53%30.03 inHg

12:00 PM

Sunny

96° 💧 None 💨 8 mph H 45%30.03 inHg

1:00 PM

Sunny

99° 💧 0.000 in 💨 7 mph H 40%30.00 inHg

2:00 PM

Mostly sunny

101° 💧 0.000 in 💨 7 mph H 35%29.97 inHg

3:00 PM

Partly cloudy

102° 💧 0.000 in 💨 8 mph H 33%29.94 inHg

4:00 PM

Partly cloudy

102° 💧 0.000 in 💨 8 mph H 33%29.91 inHg

5:00 PM

Overcast

100° 💧 0.000 in 💨 11 mph H 34%29.88 inHg

6:00 PM

Light thunderstorms

89° 💧 0.025 in 💨 15 mph H 60%29.91 inHg

7:00 PM

Mostly sunny

90° 💧 0.003 in 💨 14 mph H 51%29.91 inHg

8:00 PM

Mostly clear night

90° 💧 None 💨 12 mph H 51%29.91 inHg

9:00 PM

Mostly clear night

89° 💧 None 💨 12 mph H 53%29.94 inHg

10:00 PM

Clear night

88° 💧 None 💨 13 mph H 58%29.97 inHg

11:00 PM

Clear night

86° 💧 None 💨 11 mph H 62%30.00 inHg

Thursday

12:00 AM

Clear night

85° 💧 None 💨 12 mph H 68%30.00 inHg

1:00 AM

Clear night

83° 💧 None 💨 10 mph H 74%30.00 inHg

2:00 AM

Clear night

82° 💧 None 💨 9 mph H 77%30.00 inHg

3:00 AM

Clear night

82° 💧 0.000 in 💨 9 mph H 79%29.97 inHg

4:00 AM

Clear night

81° 💧 None 💨 8 mph H 81%29.97 inHg

5:00 AM

Clear night

81° 💧 None 💨 7 mph H 82%29.94 inHg

6:00 AM

Clear night

80° 💧 None 💨 6 mph H 84%29.94 inHg

7:00 AM

Clear night

80° 💧 None 💨 6 mph H 85%29.97 inHg

8:00 AM

Sunny

81° 💧 None 💨 6 mph H 83%29.97 inHg

9:00 AM

Sunny

84° 💧 None 💨 8 mph H 74%30.00 inHg

10:00 AM

Mostly sunny

88° 💧 None 💨 7 mph H 63%30.00 inHg

11:00 AM

Strong thunderstorm

91° 💧 0.001 in 💨 6 mph H 55%30.00 inHg

12:00 PM

Strong thunderstorm

94° 💧 0.000 in 💨 6 mph H 47%29.97 inHg

1:00 PM

Strong thunderstorm

97° 💧 0.001 in 💨 6 mph H 40%29.94 inHg

2:00 PM

Strong thunderstorm

100° 💧 0.001 in 💨 5 mph H 34%29.88 inHg

3:00 PM

Sunny

101° 💧 0.001 in 💨 5 mph H 31%29.85 inHg

4:00 PM

Mostly sunny

103° 💧 0.000 in 💨 5 mph H 29%29.83 inHg

5:00 PM

Mostly sunny

103° 💧 0.000 in 💨 5 mph H 28%29.80 inHg

6:00 PM

Mostly sunny

101° 💧 0.000 in 💨 8 mph H 29%29.77 inHg

7:00 PM

Mostly sunny

98° 💧 0.002 in 💨 11 mph H 32%29.77 inHg

8:00 PM

Mostly clear night

92° 💧 0.001 in 💨 16 mph H 49%29.80 inHg

9:00 PM

Mostly clear night

90° 💧 None 💨 12 mph H 58%29.83 inHg

10:00 PM

Mostly clear night

89° 💧 None 💨 16 mph H 57%29.88 inHg

11:00 PM

Mostly clear night

86° 💧 None 💨 15 mph H 66%29.91 inHg

Friday

12:00 AM

Clear night

84° 💧 None 💨 12 mph H 74%29.91 inHg

1:00 AM

Clear night

84° 💧 None 💨 11 mph H 76%29.88 inHg

2:00 AM

Clear night

84° 💧 None 💨 11 mph H 75%29.88 inHg

3:00 AM

Clear night

84° 💧 None 💨 11 mph H 72%29.85 inHg

4:00 AM

Clear night

83° 💧 None 💨 10 mph H 71%29.85 inHg

5:00 AM

Clear night

83° 💧 None 💨 10 mph H 72%29.83 inHg

6:00 AM

Clear night

82° 💧 None 💨 8 mph H 73%29.83 inHg

7:00 AM

Mostly clear night

82° 💧 None 💨 8 mph H 75%29.83 inHg

10:00 AM

Sunny

89° 💧 None 💨 9 mph H 56%29.85 inHg

1:00 PM

Mostly sunny

100° 💧 None 💨 8 mph H 36%29.83 inHg

4:00 PM

Mostly sunny

104° 💧 None 💨 12 mph H 29%29.71 inHg

7:00 PM

Mostly sunny

96° 💧 None 💨 16 mph H 41%29.71 inHg

10:00 PM

Mostly clear night

88° 💧 None 💨 16 mph H 62%29.80 inHg

Saturday

1:00 AM

Clear night

85° 💧 None 💨 13 mph H 71%29.80 inHg

4:00 AM

Clear night

84° 💧 None 💨 10 mph H 72%29.77 inHg

7:00 AM

Clear night

82° 💧 None 💨 10 mph H 72%29.77 inHg

10:00 AM

Sunny

88° 💧 None 💨 13 mph H 60%29.83 inHg

1:00 PM

Sunny

100° 💧 None 💨 12 mph H 40%29.80 inHg

4:00 PM

Mostly sunny

105° 💧 None 💨 11 mph H 30%29.71 inHg

7:00 PM

Partly cloudy

99° 💧 None 💨 18 mph H 35%29.68 inHg

10:00 PM

Partly cloudy night

88° 💧 None 💨 18 mph H 64%29.80 inHg

Sunday

1:00 AM

Mostly clear night

84° 💧 None 💨 14 mph H 71%29.83 inHg

4:00 AM

Clear night

83° 💧 None 💨 13 mph H 72%29.83 inHg

7:00 AM

Clear night

82° 💧 None 💨 12 mph H 79%29.83 inHg

10:00 AM

Mostly sunny

89° 💧 None 💨 15 mph H 60%29.85 inHg

1:00 PM

Sunny

101° 💧 None 💨 17 mph H 36%29.83 inHg

4:00 PM

Mostly sunny

105° 💧 None 💨 19 mph H 24%29.74 inHg

7:00 PM

Mostly sunny

97° 💧 None 💨 20 mph H 35%29.74 inHg

10:00 PM

Clear night

87° 💧 None 💨 19 mph H 55%29.83 inHg

Monday

1:00 AM

Clear night

83° 💧 None 💨 15 mph H 77%29.88 inHg

4:00 AM

Clear night

83° 💧 None 💨 15 mph H 78%29.85 inHg

7:00 AM

Clear night

82° 💧 None 💨 14 mph H 79%29.85 inHg

1:00 PM

Sunny

101° 💧 None 💨 18 mph H 33%29.85 inHg

7:00 PM

Mostly sunny

95° 💧 None 💨 19 mph H 42%29.77 inHg

Tuesday

1:00 AM

Clear night

83° 💧 None 💨 13 mph H 78%29.91 inHg

7:00 AM

Clear night

82° 💧 None 💨 11 mph H 81%29.91 inHg

1:00 PM

Mostly sunny

100° 💧 None 💨 15 mph H 36%29.94 inHg

7:00 PM

Partly cloudy

97° 💧 None 💨 18 mph H 38%29.85 inHg

Wednesday

1:00 AM

Clear night

83° 💧 None 💨 12 mph H 75%30.00 inHg

7:00 AM

Clear night

80° 💧 None 💨 9 mph H 86%30.00 inHg

1:00 PM

Mostly sunny

99° 💧 None 💨 9 mph H 38%30.00 inHg

7:00 PM

Sunny

95° 💧 None 💨 13 mph H 40%29.88 inHg

Thursday

1:00 AM

Clear night

83° 💧 None 💨 10 mph H 72%30.00 inHg

7:00 AM

Clear night

79° 💧 None 💨 7 mph H 89%29.97 inHg

1:00 PM

Sunny

97° 💧 None 💨 7 mph H 39%29.97 inHg

7:00 PM

Partly cloudy

96° 💧 None 💨 14 mph H 36%29.83 inHg

Friday

1:00 AM

Clear night

84° 💧 None 💨 12 mph H 70%29.94 inHg

7:00 AM

Clear night

79° 💧 None 💨 7 mph H 86%29.88 inHg

1:00 PM

Mostly sunny

98° 💧 None 💨 6 mph H 38%29.88 inHg

7:00 PM

Partly cloudy

90° 💧 None 💨 16 mph H 51%29.77 inHg

Saturday

1:00 AM

Overcast night

81° 💧 None 💨 10 mph H 77%29.85 inHg

7:00 AM

Clear night

80° 💧 None 💨 9 mph H 81%29.83 inHg

1:00 PM

Partly cloudy

99° 💧 None 💨 11 mph H 31%29.83 inHg

7:00 PM

Mostly sunny

96° 💧 None 💨 16 mph H 35%29.71 inHg

Sunday

1:00 AM

Clear night

82° 💧 None 💨 12 mph H 75%29.83 inHg

7:00 AM

Clear night

81° 💧 None 💨 11 mph H 81%29.85 inHg

1:00 PM

Sunny

99° 💧 None 💨 12 mph H 33%29.85 inHg

7:00 PM

Sunny

95° 💧 None 💨 16 mph H 40%29.77 inHg

Monday

1:00 AM

Mostly clear night

84° 💧 None 💨 13 mph H 75%29.94 inHg

7:00 AM

Clear night

81° 💧 None 💨 6 mph H 83%29.94 inHg

1:00 PM

Mostly sunny

98° 💧 None 💨 6 mph H 38%29.97 inHg

7:00 PM

Light rain

85° 💧 None 💨 9 mph H 69%29.94 inHg

Tuesday

1:00 AM

Light rain

76° 💧 None 💨 2 mph H 92%30.06 inHg

7:00 AM

Mostly cloudy night

76° 💧 None 💨 8 mph H 91%30.03 inHg

1:00 PM

Light rain

88° 💧 None 💨 8 mph H 59%30.03 inHg

7:00 PM

Mostly sunny

83° 💧 None 💨 10 mph H 70%29.94 inHg

Wednesday

1:00 AM

Mostly clear night

80° 💧 None 💨 1 mph H 85%30.00 inHg

7:00 AM

Clear night

77° 💧 None 💨 4 mph H 94%29.97 inHg

In San Juan and, more broadly, across the state of Texas: As the afternoon progresses into the evening, the sky will feature a mix of sun and clouds, creating some variation in the atmosphere. Temperatures will remain very hot, ranging from 89 to 98 degrees Fahrenheit. Expect mostly dry conditions, with no precipitation forecasted for the evening hours. Winds will be moderate, coming from the southeast at speeds up to 17 mph, with gusts reaching 24 mph at times. These breezes may bring some relief from the heat but will also contribute to a humid evening. Overall, it will be a warm and partly cloudy night with little change in the weather pattern. Remember to stay hydrated if you plan to be outdoors and take precautions against the heat.

15-Day Weather Outlook for San Juan

TomorrowTomorrow

Light thunderstorms 102°/80° 💧 None 💨 16 mph

Thursday, Sep 10Thu Sep 10

Strong thunderstorm 103°/80° 💧 None 💨 14 mph

Friday, Sep 11Fri Sep 11

Mostly sunny 104°/82° 💧 0.032 in 💨 16 mph

Saturday, Sep 12Sat Sep 12

Mostly sunny 105°/82° 💧 0.003 in 💨 16 mph

Sunday, Sep 13Sun Sep 13

Partly cloudy 105°/82° 💧 0.004 in 💨 19 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 101°/82° 💧 0.000 in 💨 20 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 100°/82° 💧 0.001 in 💨 19 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 99°/80° 💧 0.001 in 💨 18 mph

Thursday, Sep 17Thu Sep 17

Sunny 97°/79° 💧 0.001 in 💨 13 mph

Friday, Sep 18Fri Sep 18

Partly cloudy 98°/79° 💧 0.001 in 💨 14 mph

Saturday, Sep 19Sat Sep 19

Partly cloudy 99°/80° 💧 0.001 in 💨 16 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 99°/81° 💧 0.004 in 💨 16 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 98°/81° 💧 0.004 in 💨 16 mph

Tuesday, Sep 22Tue Sep 22

Light rain 88°/76° 💧 0.480 in 💨 9 mph

Wednesday, Sep 23Wed Sep 23

Mostly sunny 83°/77° 💧 0.130 in 💨 10 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 3:00 PM

PM2.5 Fine particles Good 1,1µg/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 1,2µg/m³

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

O₃ Ozone Good 42,0µg/m³

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

NO₂ Nitrogen dioxide Good 0,3µg/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 10,5Very high 😊Good

Tomorrow UV 10,6Very high 😊Good

Thursday UV 10,5Very high 😊Good

Friday UV 10,1Very high 🙂Fair

Saturday UV 10,0Very high 🙂Fair

Sunday UV 9,0Very high —Unavailable

Monday UV 9,0Very high —Unavailable

Hourly UV index today

3:00 PMUV 9,1 4:00 PMUV 6,4 5:00 PMUV 3,6 6:00 PMUV 1,4 7:00 PMUV 0,3

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.

Extreme heat risk

Drink water frequently, stay in cool places and avoid strenuous activity during the hottest hours. Dry air can increase hydration needs.

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.

100/100Best-hour score

BEST TIME TONIGHT 4:00 AM–5:00 AM Astronomical darkness: 9:06 PM–6:01 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 7% 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 min79%

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.

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Forecast data for San Juan were last refreshed today at 2:42 PM. The current forecast period extends through 10/09/2026 at 12:00 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.