Live Weather & Forecast
Weather in San Marcos
California, United States · Real-time conditions & 3-day outlook
15°C
Feels like 15°C
59°F / Feels 59°F
Partly cloudy
San Marcos, California
🌞 Daytime
Updated: 2026-04-13 08:45
Humidity
72%
Wind
4 km/h WNW
Wind Gust
5 km/h
Pressure
1017 mb
Visibility
16 km
UV Index
0.7
(Low)
Precipitation
0 mm
Cloud Cover
50%
Dew Point
9.4°C
Wind Degree
303°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
146.9 μg/m³
NO₂
2.2 μg/m³
O₃
101 μg/m³
SO₂
1.7 μg/m³
PM 2.5
5.3 μg/m³
PM 10
7.2 μg/m³
Today's Hourly Forecast
24-hour breakdown for San Marcos, California
12 AM
14°
Cloudy
1 AM
14°
Light drizzle
2 AM
13°
Partly Cloudy
3 AM
12°
Partly Cloudy
4 AM
12°
Clear
5 AM
12°
Clear
6 AM
11°
Clear
7 AM
13°
Sunny
8 AM
15°
Partly cloudy
9 AM
13°
Patchy rain nearby
10 AM
15°
Moderate rain
11 AM
16°
Patchy rain nearby
12 PM
16°
Partly Cloudy
1 PM
16°
Patchy rain nearby
2 PM
16°
Partly Cloudy
3 PM
17°
Patchy rain nearby
4 PM
17°
Partly Cloudy
5 PM
17°
Sunny
6 PM
17°
Sunny
7 PM
16°
Sunny
8 PM
14°
Overcast
9 PM
13°
Partly Cloudy
10 PM
13°
Clear
11 PM
13°
Overcast
3-Day Forecast
Daily overview for San Marcos, California
Today
Patchy rain nearby
18°
/
11°
🌧️ 87% chance of rain
💧 Avg. humidity: 73%
💨 Max wind: 24.8 km/h
🌧️ Total precip: 3.53 mm
☀️ UV Index: 1.2
🌅 Sunrise: 06:21 AM
🌇 Sunset: 07:18 PM
🌙 Waning Crescent
🌑 Moon: 23% lit
Tue, Apr 14
Partly Cloudy
22°
/
13°
🌧️ 0% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 17.3 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:19 AM
🌇 Sunset: 07:19 PM
🌙 Waning Crescent
🌑 Moon: 15% lit
Wed, Apr 15
Partly Cloudy
20°
/
12°
🌧️ 0% chance of rain
💧 Avg. humidity: 75%
💨 Max wind: 18 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:18 AM
🌇 Sunset: 07:20 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Best Time to Visit San Marcos
Plan your trip to San Marcos, United States around the most favorable weather conditions.
Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
Frequently Asked Questions
What is the current weather in San Marcos?
Current conditions in San Marcos: Partly cloudy, temperature 15°C, humidity 72%.
What is the best time to visit San Marcos?
The best time to visit San Marcos is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in San Marcos?
San Marcos is located at approximately 33.1° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in San Marcos?
The wettest period in San Marcos is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to San Marcos?
For visits to San Marcos during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is San Marcos in?
San Marcos is located in United States, in the state of California.
What are the public holidays in San Marcos in 2026?
View the 2026 public holidays for San Marcos on our Holidays page.
What are the GPS coordinates used for the weather forecast in San Marcos?
The weather forecast for San Marcos uses coordinates 33.1353, -117.1743.