No
you don't need a jacket based on the weather in San Marcos, CA, USA 1 second ago
63°F17°C & Mostly Clear
Wind is 2 mph4 km/h from the East, gusting to 3 mph5 km/h
| September 11 | ||||
| 5am | 62°F17°C | 3 mph5 km/h East | Mostly Clear | |
| 6am | 62°F16°C | 3 mph5 km/h East | Partly Cloudy | |
| 7am | 61°F16°C | 3 mph5 km/h East | Partly Cloudy | |
| 8am | 60°F16°C | 3 mph5 km/h East | Mostly Clear | |
| 9am | 59°F15°C | 3 mph4 km/h East | Mostly Clear | |
| 10am | 60°F15°C | 3 mph5 km/h East | Mostly Clear | |
| 11am | 64°F18°C | 2 mph3 km/h East | Mostly Clear | |
| 12pm | 67°F20°C | 2 mph3 km/h West | Mostly Clear | |
| 1pm | 71°F21°C | 4 mph7 km/h West | Mostly Clear | |
| 2pm | 74°F23°C | 6 mph9 km/h West | Mostly Clear | |
| 3pm | 76°F24°C | 8 mph12 km/h West | Mostly Clear | |
| 4pm | 77°F25°C | 9 mph15 km/h West | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 11 | 59°F15°C | 77°F25°C | 6 mph10 km/h from West | Mostly Clear | Mostly Clear |
| September 12 | 59°F15°C | 77°F25°C | 6 mph9 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 13 | 60°F15°C | 78°F25°C | 5 mph9 km/h from West | Mostly Clear | Mostly Clear |
| September 14 | 61°F16°C | 80°F26°C | 5 mph8 km/h from West | Mostly Clear | Clear |
| September 15 | 62°F17°C | 82°F28°C | 5 mph8 km/h from West | Clear | Clear |
| September 16 | 63°F17°C | 87°F30°C | 5 mph8 km/h from West | Mostly Clear | Partly Cloudy |
| September 17 | 70°F21°C | 88°F31°C | 5 mph7 km/h from West | Partly Cloudy | Partly Cloudy |
No
Low of 60°F16°C, High of 77°F25°CWind: 6 mph9 km/h
Precipitation: None