No
you don't need a jacket based on the weather in San Ramon, CA, USA 1 second ago
91°F33°C & Clear
Wind is 6 mph9 km/h from the West, gusting to 8 mph13 km/h
| September 16 | ||||
| 6pm | 91°F33°C | 7 mph12 km/h West | Clear | |
| 7pm | 90°F32°C | 8 mph13 km/h West | Clear | |
| 8pm | 88°F31°C | 8 mph13 km/h West | Clear | |
| 9pm | 86°F30°C | 7 mph12 km/h West | Clear | |
| 10pm | 80°F27°C | 5 mph9 km/h West | Clear | |
| 11pm | 76°F24°C | 5 mph8 km/h West | Clear | |
| September 17 | ||||
| 12am | 74°F23°C | 4 mph6 km/h West | Clear | |
| 1am | 69°F21°C | 3 mph5 km/h Southwest | Clear | |
| 2am | 67°F19°C | 3 mph5 km/h Southwest | Clear | |
| 3am | 65°F19°C | 3 mph5 km/h Southwest | Clear | |
| 4am | 64°F18°C | 3 mph5 km/h Southwest | Clear | |
| 5am | 63°F17°C | 3 mph4 km/h Southwest | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 16 | 61°F16°C | 91°F33°C | 4 mph7 km/h from Southwest | Clear | Clear |
| September 17 | 58°F15°C | 90°F32°C | 5 mph8 km/h from West | Mostly Clear | Mostly Cloudy |
| September 18 | 62°F17°C | 76°F25°C | 5 mph9 km/h from Southwest | Cloudy | Mostly Cloudy |
| September 19 | 60°F15°C | 79°F26°C | 4 mph7 km/h from West | Partly Cloudy | Mostly Clear |
| September 20 | 57°F14°C | 81°F27°C | 4 mph7 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 56°F14°C | 86°F30°C | 4 mph6 km/h from West | Mostly Clear | Mostly Clear |
| September 22 | 59°F15°C | 82°F28°C | 4 mph6 km/h from Southwest | Partly Cloudy | Mostly Cloudy |
Yes
Low of 58°F15°C, High of 91°F33°CWind: 5 mph8 km/h
Precipitation: None