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Current weather in Lake San Marcos is clear sky.

Where can I find the hourly weather forecast for Lake San Marcos?

This page shows hourly weather forecast for Lake San Marcos, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for Lake San Marcos updated regularly?

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

Now · 12:06 PM

Lake San Marcos Weather & Hourly Forecast

United States · California · 92078

77°F

Sunny

Feels like: 77°F

💧 Humidity 53% 🌡 Pressure 29.97 inHg 💨 Wind 6 mph 👁 Visibility 23.3 mi ☁ Clouds 8% ☀️ UV index 8.2 · Very high 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Lake San Marcos

Today

1:00 PM

Sunny

77° 💧 None 💨 9 mph H 56%29.97 inHg

4:00 PM

Sunny

75° 💧 None 💨 7 mph H 54%29.94 inHg

7:00 PM

Clear night

70° 💧 None 💨 5 mph H 71%29.97 inHg

10:00 PM

Clear night

68° 💧 None 💨 2 mph H 76%30.03 inHg

Tomorrow

1:00 AM

Mostly clear night

67° 💧 0.000 in 💨 1 mph H 79%30.03 inHg

4:00 AM

Partly cloudy night

66° 💧 0.001 in 💨 2 mph H 84%30.03 inHg

7:00 AM

Partly cloudy

65° 💧 0.002 in 💨 1 mph H 88%30.06 inHg

10:00 AM

Mostly sunny

71° 💧 0.000 in 💨 3 mph H 67%30.09 inHg

1:00 PM

Mostly sunny

76° 💧 0.000 in 💨 8 mph H 61%30.06 inHg

4:00 PM

Sunny

74° 💧 None 💨 9 mph H 61%30.03 inHg

7:00 PM

Clear night

69° 💧 None 💨 5 mph H 71%30.03 inHg

10:00 PM

Clear night

67° 💧 None 💨 2 mph H 79%30.06 inHg

Friday

1:00 AM

Mostly clear night

65° 💧 None 💨 1 mph H 86%30.03 inHg

4:00 AM

Clear night

62° 💧 None 💨 1 mph H 89%30.00 inHg

7:00 AM

Partly cloudy

61° 💧 None 💨 1 mph H 92%30.03 inHg

10:00 AM

Partly cloudy

74° 💧 None 💨 4 mph H 60%30.03 inHg

Today

1:00 PM

Sunny

77° 💧 None 💨 9 mph H 56%29.97 inHg

2:00 PM

Sunny

76° 💧 None 💨 8 mph H 56%29.97 inHg

3:00 PM

Sunny

76° 💧 None 💨 8 mph H 55%29.94 inHg

4:00 PM

Sunny

75° 💧 None 💨 7 mph H 54%29.94 inHg

5:00 PM

Sunny

74° 💧 None 💨 6 mph H 57%29.97 inHg

6:00 PM

Sunny

72° 💧 None 💨 6 mph H 64%29.97 inHg

7:00 PM

Clear night

70° 💧 None 💨 5 mph H 71%29.97 inHg

8:00 PM

Clear night

69° 💧 None 💨 4 mph H 72%30.00 inHg

9:00 PM

Clear night

69° 💧 None 💨 3 mph H 73%30.03 inHg

10:00 PM

Clear night

68° 💧 None 💨 2 mph H 76%30.03 inHg

11:00 PM

Clear night

68° 💧 None 💨 1 mph H 77%30.03 inHg

Tomorrow

12:00 AM

Mostly clear night

67° 💧 None 💨 1 mph H 78%30.03 inHg

1:00 AM

Mostly clear night

67° 💧 0.000 in 💨 1 mph H 79%30.03 inHg

2:00 AM

Mostly clear night

67° 💧 0.000 in 💨 1 mph H 80%30.03 inHg

3:00 AM

Partly cloudy night

66° 💧 None 💨 1 mph H 82%30.03 inHg

4:00 AM

Partly cloudy night

66° 💧 0.000 in 💨 2 mph H 84%30.03 inHg

5:00 AM

Partly cloudy night

66° 💧 0.000 in 💨 2 mph H 85%30.03 inHg

6:00 AM

Partly cloudy night

65° 💧 0.001 in 💨 2 mph H 87%30.06 inHg

7:00 AM

Partly cloudy

65° 💧 0.001 in 💨 1 mph H 88%30.06 inHg

8:00 AM

Mostly sunny

67° 💧 0.001 in 💨 1 mph H 80%30.09 inHg

9:00 AM

Mostly sunny

69° 💧 None 💨 1 mph H 73%30.09 inHg

10:00 AM

Mostly sunny

71° 💧 0.000 in 💨 3 mph H 67%30.09 inHg

11:00 AM

Mostly sunny

74° 💧 0.000 in 💨 4 mph H 60%30.09 inHg

12:00 PM

Mostly sunny

76° 💧 None 💨 6 mph H 60%30.06 inHg

1:00 PM

Mostly sunny

76° 💧 0.000 in 💨 8 mph H 61%30.06 inHg

2:00 PM

Sunny

76° 💧 None 💨 9 mph H 60%30.03 inHg

3:00 PM

Sunny

75° 💧 None 💨 9 mph H 60%30.03 inHg

4:00 PM

Sunny

74° 💧 None 💨 9 mph H 61%30.03 inHg

5:00 PM

Sunny

72° 💧 None 💨 7 mph H 64%30.03 inHg

6:00 PM

Sunny

71° 💧 None 💨 6 mph H 67%30.00 inHg

7:00 PM

Clear night

69° 💧 None 💨 5 mph H 71%30.03 inHg

8:00 PM

Clear night

69° 💧 None 💨 4 mph H 73%30.03 inHg

9:00 PM

Clear night

68° 💧 None 💨 3 mph H 76%30.06 inHg

10:00 PM

Clear night

67° 💧 None 💨 2 mph H 79%30.06 inHg

11:00 PM

Clear night

66° 💧 None 💨 2 mph H 82%30.06 inHg

Friday

12:00 AM

Clear night

66° 💧 None 💨 1 mph H 84%30.06 inHg

1:00 AM

Mostly clear night

65° 💧 None 💨 1 mph H 86%30.03 inHg

2:00 AM

Clear night

64° 💧 None 💨 1 mph H 87%30.03 inHg

3:00 AM

Clear night

63° 💧 None 💨 1 mph H 89%30.03 inHg

4:00 AM

Clear night

62° 💧 None 💨 1 mph H 89%30.00 inHg

5:00 AM

Clear night

62° 💧 None 💨 1 mph H 90%30.03 inHg

6:00 AM

Mostly clear night

61° 💧 None 💨 1 mph H 92%30.03 inHg

7:00 AM

Partly cloudy

61° 💧 None 💨 1 mph H 92%30.03 inHg

8:00 AM

Sunny

66° 💧 None 💨 1 mph H 77%30.03 inHg

9:00 AM

Sunny

70° 💧 None 💨 3 mph H 68%30.03 inHg

10:00 AM

Partly cloudy

74° 💧 None 💨 4 mph H 60%30.03 inHg

11:00 AM

Mostly sunny

75° 💧 None 💨 6 mph H 59%30.03 inHg

12:00 PM

Sunny

76° 💧 None 💨 7 mph H 58%30.03 inHg

1:00 PM

Sunny

76° 💧 None 💨 8 mph H 57%30.00 inHg

2:00 PM

Sunny

76° 💧 None 💨 8 mph H 57%30.00 inHg

3:00 PM

Sunny

75° 💧 None 💨 8 mph H 60%29.97 inHg

4:00 PM

Sunny

75° 💧 None 💨 7 mph H 63%29.94 inHg

5:00 PM

Sunny

73° 💧 None 💨 7 mph H 66%29.94 inHg

6:00 PM

Sunny

71° 💧 None 💨 5 mph H 71%29.94 inHg

7:00 PM

Clear night

69° 💧 None 💨 4 mph H 76%29.94 inHg

8:00 PM

Clear night

69° 💧 None 💨 2 mph H 79%29.94 inHg

9:00 PM

Clear night

68° 💧 None 💨 1 mph H 82%29.97 inHg

10:00 PM

Clear night

66° 💧 None 💨 1 mph H 86%29.97 inHg

11:00 PM

Clear night

65° 💧 None 💨 1 mph H 89%29.97 inHg

Saturday

12:00 AM

Clear night

64° 💧 None 💨 1 mph H 93%29.94 inHg

1:00 AM

Clear night

63° 💧 None 💨 1 mph H 95%29.94 inHg

2:00 AM

Mostly clear night

62° 💧 None 💨 1 mph H 96%29.94 inHg

3:00 AM

Partly cloudy night

61° 💧 None 💨 1 mph H 96%29.94 inHg

4:00 AM

Partly cloudy night

60° 💧 None 💨 1 mph H 97%29.91 inHg

5:00 AM

Mostly cloudy night

59° 💧 None 💨 1 mph H 98%29.91 inHg

8:00 AM

Mostly sunny

65° 💧 None 💨 4 mph H 84%29.94 inHg

11:00 AM

Mostly sunny

76° 💧 None 💨 4 mph H 61%29.94 inHg

2:00 PM

Sunny

77° 💧 None 💨 8 mph H 58%29.88 inHg

5:00 PM

Sunny

75° 💧 None 💨 6 mph H 65%29.85 inHg

8:00 PM

Clear night

70° 💧 None 💨 1 mph H 79%29.88 inHg

11:00 PM

Mostly clear night

67° 💧 None 💨 2 mph H 85%29.91 inHg

Sunday

2:00 AM

Mostly cloudy night

64° 💧 None 💨 4 mph H 89%29.88 inHg

5:00 AM

Overcast night

63° 💧 None 💨 5 mph H 92%29.88 inHg

8:00 AM

Overcast

64° 💧 None 💨 3 mph H 89%29.91 inHg

11:00 AM

Overcast

75° 💧 None 💨 5 mph H 66%29.94 inHg

2:00 PM

Mostly sunny

77° 💧 None 💨 8 mph H 64%29.88 inHg

5:00 PM

Sunny

74° 💧 None 💨 8 mph H 62%29.85 inHg

8:00 PM

Clear night

69° 💧 None 💨 3 mph H 78%29.88 inHg

11:00 PM

Partly cloudy night

67° 💧 None 💨 0 mph H 84%29.91 inHg

Monday

2:00 AM

Overcast night

67° 💧 None 💨 2 mph H 85%29.88 inHg

5:00 AM

Mostly clear night

66° 💧 None 💨 3 mph H 88%29.88 inHg

8:00 AM

Mostly cloudy

68° 💧 None 💨 5 mph H 79%29.91 inHg

11:00 AM

Light rain

75° 💧 None 💨 4 mph H 55%29.91 inHg

2:00 PM

Mostly sunny

76° 💧 None 💨 10 mph H 61%29.85 inHg

5:00 PM

Partly cloudy

72° 💧 None 💨 7 mph H 69%29.83 inHg

8:00 PM

Clear night

69° 💧 None 💨 4 mph H 75%29.85 inHg

11:00 PM

Clear night

67° 💧 None 💨 1 mph H 81%29.88 inHg

Tuesday

5:00 AM

Mostly clear night

67° 💧 None 💨 1 mph H 84%29.88 inHg

11:00 AM

Sunny

64° 💧 None 💨 4 mph H 90%29.85 inHg

5:00 PM

Partly cloudy

76° 💧 None 💨 3 mph H 54%29.88 inHg

11:00 PM

Mostly clear night

74° 💧 None 💨 8 mph H 69%29.80 inHg

Wednesday

5:00 AM

Clear night

68° 💧 None 💨 1 mph H 87%29.85 inHg

11:00 AM

Partly cloudy

66° 💧 None 💨 1 mph H 93%29.85 inHg

5:00 PM

Partly cloudy

76° 💧 None 💨 6 mph H 66%29.91 inHg

11:00 PM

Clear night

74° 💧 None 💨 7 mph H 74%29.85 inHg

Thursday

5:00 AM

Mostly clear night

69° 💧 None 💨 1 mph H 91%29.91 inHg

11:00 AM

Mostly cloudy

67° 💧 None 💨 2 mph H 96%29.91 inHg

5:00 PM

Mostly sunny

77° 💧 None 💨 5 mph H 69%29.94 inHg

11:00 PM

Clear night

75° 💧 None 💨 5 mph H 75%29.88 inHg

Friday

5:00 AM

Clear night

70° 💧 None 💨 2 mph H 91%29.94 inHg

11:00 AM

Partly cloudy

67° 💧 None 💨 1 mph H 95%29.91 inHg

5:00 PM

Mostly sunny

77° 💧 None 💨 7 mph H 72%29.91 inHg

11:00 PM

Mostly clear night

76° 💧 None 💨 5 mph H 74%29.88 inHg

Saturday

5:00 AM

Overcast night

71° 💧 None 💨 3 mph H 94%29.91 inHg

11:00 AM

Overcast

69° 💧 None 💨 3 mph H 96%29.88 inHg

5:00 PM

Mostly cloudy

80° 💧 None 💨 5 mph H 65%29.88 inHg

11:00 PM

Overcast night

78° 💧 None 💨 5 mph H 70%29.85 inHg

Sunday

5:00 AM

Overcast night

71° 💧 None 💨 4 mph H 89%29.85 inHg

11:00 AM

Mostly cloudy

67° 💧 None 💨 1 mph H 98%29.83 inHg

5:00 PM

Mostly cloudy

79° 💧 None 💨 3 mph H 62%29.83 inHg

11:00 PM

Partly cloudy night

77° 💧 None 💨 5 mph H 72%29.80 inHg

Monday

5:00 AM

Clear night

71° 💧 None 💨 2 mph H 86%29.83 inHg

11:00 AM

Mostly sunny

68° 💧 None 💨 2 mph H 93%29.80 inHg

5:00 PM

Partly cloudy

77° 💧 None 💨 5 mph H 65%29.83 inHg

11:00 PM

Clear night

73° 💧 None 💨 8 mph H 73%29.80 inHg

Tuesday

5:00 AM

Mostly cloudy night

69° 💧 None 💨 3 mph H 78%29.83 inHg

11:00 AM

Mostly sunny

67° 💧 None 💨 2 mph H 78%29.83 inHg

5:00 PM

Partly cloudy

74° 💧 None 💨 6 mph H 50%29.88 inHg

11:00 PM

Mostly clear night

71° 💧 None 💨 7 mph H 64%29.83 inHg

Wednesday

5:00 AM

Mostly clear night

68° 💧 None 💨 1 mph H 71%29.85 inHg

11:00 AM

Mostly sunny

64° 💧 None 💨 7 mph H 80%29.83 inHg

5:00 PM

Mostly cloudy

74° 💧 None 💨 6 mph H 54%29.88 inHg

11:00 PM

Partly cloudy night

72° 💧 None 💨 9 mph H 63%29.83 inHg

In Lake San Marcos and, more broadly, across the state of California: Today will remain mostly sunny with just a few clouds drifting by. Temperatures will climb into the mid to upper 70s, reaching up to 82 degrees in the afternoon, providing warm and comfortable conditions. Winds will be coming from the northwest at moderate speeds, averaging around 10 to 13 mph, with gusts possibly reaching 24 mph. No rain is expected throughout the rest of the day, so outdoor plans should be enjoyable. As the day progresses, expect a gentle breeze adding to the pleasant weather. Overall, it’s a fine day with mild temperatures and plenty of sunshine, making for a good afternoon outdoors.

15-Day Weather Outlook for Lake San Marcos

TomorrowTomorrow

Mostly sunny 76°/65° 💧 None 💨 9 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 76°/61° 💧 None 💨 8 mph

Saturday, Sep 19Sat Sep 19

Mostly sunny 77°/59° 💧 None 💨 8 mph

Sunday, Sep 20Sun Sep 20

Overcast 77°/63° 💧 0.006 in 💨 8 mph

Monday, Sep 21Mon Sep 21

Light rain 76°/66° 💧 0.011 in 💨 10 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 76°/64° 💧 0.000 in 💨 8 mph

Wednesday, Sep 23Wed Sep 23

Partly cloudy 76°/66° 💧 0.001 in 💨 7 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 77°/67° 💧 0.001 in 💨 5 mph

Friday, Sep 25Fri Sep 25

Partly cloudy 77°/67° 💧 None 💨 7 mph

Saturday, Sep 26Sat Sep 26

Overcast 80°/69° 💧 None 💨 5 mph

Sunday, Sep 27Sun Sep 27

Overcast 79°/67° 💧 0.001 in 💨 5 mph

Monday, Sep 28Mon Sep 28

Mostly sunny 77°/68° 💧 0.001 in 💨 8 mph

Tuesday, Sep 29Tue Sep 29

Mostly cloudy 74°/67° 💧 0.001 in 💨 7 mph

Wednesday, Sep 30Wed Sep 30

Mostly sunny 74°/64° 💧 0.001 in 💨 9 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Lake San Marcos

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Lake San Marcos

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 1:00 PM

PM2.5 Fine particles Good 3,5µg/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 9,7µg/m³

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

O₃ Ozone Fair 98,7µg/m³

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

NO₂ Nitrogen dioxide Good 0,2µg/m³

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

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Lake San Marcos

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 8,8Very high 🙂Fair

Tomorrow UV 8,6Very high 🙂Fair

Friday UV 8,4Very high 🙂Fair

Saturday UV 8,9Very high 😐Moderate

Sunday UV 7,0High 🙂Fair

Monday UV 6,0High —Unavailable

Tuesday UV 6,0High —Unavailable

Hourly UV index today

1:00 PMUV 8,8 2:00 PMUV 7,8 3:00 PMUV 5,8 4:00 PMUV 3,3 5:00 PMUV 1,4 6:00 PMUV 0,3 7:00 PMUV 0,0

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.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

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 Lake San Marcos

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · LAKE SAN MARCOS, CALIFORNIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 10:00 PM–11:00 PM.

93/100Best-hour score

BEST TIME TONIGHT 10:00 PM–11:00 PM Astronomical darkness: 8:17 PM–5:10 AM

☁ Cloud cover 8% Real hourly forecast for the best viewing hour.

☾ Moonlight 29% Waxing Crescent · Moon about 0° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 18° high at the best hour.

✦ Estimated visible meteors 0–2/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min33%

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 Lake San Marcos were last refreshed today at 12:06 PM. The current forecast period extends through 18/09/2026 at 10:00 AM. 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.