❮
Today Hourly 7 days 30 days May
❯

May 2026 Weather | San Marcos, California

Today 5/20
Sunny Weather
Day 81°
Night 52°
1
Thu 5/21
Cloudy Weather
Day 77°
Night 55°
1
Fri 5/22
Cloudy Weather
Day 72°
Night 55°
0
Sat 5/23
Cloudy Weather
Day 70°
Night 57°
0
Sun 5/24
Cloudy Weather
Day 72°
Night 55°
0
Mon 5/25
Cloudy Weather
Day 77°
Night 59°
2
Tue 5/26
Cloudy Weather
Day 73°
Night 57°
9
Wed 5/27
Cloudy Weather
Day 73°
Night 57°
2
Thu 5/28
Cloudy Weather
Day 75°
Night 57°
1
Fri 5/29
Sunny Weather
Day 77°
Night 63°
0
Sat 5/30
Cloudy Weather
Day 79°
Night 57°
0
Sun 5/31
Cloudy Weather
Day 79°
Night 59°
0

Explore U.S. Weather Trends

❄️ Coldest Cities in the U.S. – Live Temperature Rankings 🔥 Hottest Cities Today – Real-Time Heat Observations ⚠️ Active Weather Alerts – Warnings, Watches & Advisories 🌪️ Windiest Cities – Highest Sustained Wind Speeds 🌫️ Worst Air Quality – Cities with the Highest AQI 🍃 Best Air Quality – Cities with the Lowest AQI