No
you don't need a jacket based on the weather in Costa Mesa, CA, USA 1 second ago
73°F23°C & Cloudy
Wind is 4 mph6 km/h from the Southwest, gusting to 7 mph11 km/h
| September 18 | ||||
| 12am | 72°F22°C | 4 mph6 km/h Southwest | Cloudy | |
| 1am | 71°F22°C | 3 mph4 km/h Southwest | Cloudy | |
| 2am | 72°F22°C | 5 mph8 km/h Northeast | Cloudy | |
| 3am | 72°F22°C | 5 mph7 km/h North | Cloudy | |
| 4am | 71°F22°C | 5 mph9 km/h Northwest | Thunderstorms | |
| 5am | 70°F21°C | 4 mph7 km/h Northwest | Thunderstorms | |
| 6am | 70°F21°C | 9 mph14 km/h North | Thunderstorms | |
| 7am | 69°F20°C | 5 mph7 km/h Northwest | Thunderstorms | |
| 8am | 68°F20°C | 5 mph8 km/h Northwest | Rain | |
| 9am | 68°F20°C | 4 mph7 km/h Northwest | Thunderstorms | |
| 10am | 68°F20°C | 3 mph5 km/h Northwest | Thunderstorms | |
| 11am | 69°F21°C | 3 mph5 km/h Northwest | Thunderstorms | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 68°F20°C | 83°F29°C | 4 mph7 km/h from West | Partly Cloudy | Thunderstorms |
| September 18 | 68°F20°C | 81°F27°C | 6 mph9 km/h from West | Thunderstorms | Drizzle |
| September 19 | 68°F20°C | 79°F26°C | 6 mph9 km/h from Southwest | Mostly Clear | Mostly Clear |
| September 20 | 66°F19°C | 80°F27°C | 6 mph9 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 65°F18°C | 79°F26°C | 4 mph7 km/h from West | Partly Cloudy | Partly Cloudy |
| September 22 | 66°F19°C | 81°F27°C | 4 mph7 km/h from West | Partly Cloudy | Mostly Clear |
| September 23 | 68°F20°C | 80°F27°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
No
Low of 68°F20°C, High of 82°F28°CWind: 6 mph9 km/h
Precipitation: 65% rain