Live Weather & Forecast

Weather in San Marcos

California, United States · Real-time conditions & 3-day outlook

Flag of United States
Partly cloudy
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
Cloudy
14°
Cloudy
💧 88% 💨 7.2 km/h
1 AM
Light drizzle
14°
Light drizzle
💧 89% 💨 7.6 km/h 🌧️ 100%
2 AM
Partly Cloudy
13°
Partly Cloudy
💧 89% 💨 6.5 km/h
3 AM
Partly Cloudy
12°
Partly Cloudy
💧 81% 💨 5 km/h
4 AM
Clear
12°
Clear
💧 79% 💨 4.7 km/h
5 AM
Clear
12°
Clear
💧 77% 💨 4.3 km/h
6 AM
Clear
11°
Clear
💧 77% 💨 3.6 km/h
7 AM
Sunny
13°
Sunny
💧 82% 💨 3.6 km/h
8 AM
Partly cloudy
15°
Partly cloudy
💧 72% 💨 4 km/h
9 AM
Patchy rain nearby
13°
Patchy rain nearby
💧 66% 💨 6.5 km/h 🌧️ 100%
10 AM
Moderate rain
15°
Moderate rain
💧 88% 💨 10.4 km/h 🌧️ 100%
11 AM
Patchy rain nearby
16°
Patchy rain nearby
💧 73% 💨 19.1 km/h 🌧️ 100%
12 PM
Partly Cloudy
16°
Partly Cloudy
💧 64% 💨 22.3 km/h
1 PM
Patchy rain nearby
16°
Patchy rain nearby
💧 71% 💨 23 km/h 🌧️ 79%
2 PM
Partly Cloudy
16°
Partly Cloudy
💧 66% 💨 22.3 km/h
3 PM
Patchy rain nearby
17°
Patchy rain nearby
💧 70% 💨 24.8 km/h 🌧️ 100%
4 PM
Partly Cloudy
17°
Partly Cloudy
💧 52% 💨 24.8 km/h
5 PM
Sunny
17°
Sunny
💧 54% 💨 23.4 km/h
6 PM
Sunny
17°
Sunny
💧 56% 💨 22.7 km/h
7 PM
Sunny
16°
Sunny
💧 60% 💨 21.2 km/h
8 PM
Overcast
14°
Overcast
💧 67% 💨 16.2 km/h
9 PM
Partly Cloudy
13°
Partly Cloudy
💧 64% 💨 11.9 km/h
10 PM
Clear
13°
Clear
💧 71% 💨 10.4 km/h
11 PM
Overcast
13°
Overcast
💧 84% 💨 8.3 km/h

3-Day Forecast

Daily overview for San Marcos, California

Today
Patchy rain nearby
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
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
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.
← Back to San Marcos 🗓 View Holidays 2026

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.