No
you don't need a jacket based on the weather in Hayward, CA, USA 1 second ago
61°F16°C & Mostly Cloudy
Wind is 6 mph10 km/h from the Southwest, gusting to 12 mph20 km/h
| August 17 | ||||
| 4am | 61°F16°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| 5am | 60°F16°C | 7 mph11 km/h Southwest | Mostly Cloudy | |
| 6am | 60°F15°C | 7 mph11 km/h Southwest | Mostly Cloudy | |
| 7am | 59°F15°C | 7 mph11 km/h Southwest | Cloudy | |
| 8am | 59°F15°C | 7 mph11 km/h Southwest | Cloudy | |
| 9am | 59°F15°C | 7 mph11 km/h Southwest | Cloudy | |
| 10am | 59°F15°C | 7 mph11 km/h Southwest | Cloudy | |
| 11am | 60°F16°C | 7 mph11 km/h Southwest | Mostly Cloudy | |
| 12pm | 61°F16°C | 7 mph12 km/h Southwest | Mostly Cloudy | |
| 1pm | 63°F17°C | 8 mph13 km/h Southwest | Mostly Cloudy | |
| 2pm | 65°F18°C | 9 mph14 km/h Southwest | Partly Cloudy | |
| 3pm | 67°F20°C | 10 mph15 km/h West | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| August 17 | 59°F15°C | 72°F22°C | 10 mph15 km/h from West | Partly Cloudy | Partly Cloudy |
| August 18 | 57°F14°C | 75°F24°C | 7 mph12 km/h from West | Mostly Clear | Mostly Clear |
| August 19 | 55°F13°C | 73°F23°C | 7 mph11 km/h from West | Mostly Clear | Partly Cloudy |
| August 20 | 56°F13°C | 79°F26°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| August 21 | 55°F13°C | 80°F27°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| August 22 | 55°F13°C | 75°F24°C | 5 mph8 km/h from West | Mostly Clear | Partly Cloudy |
| August 23 | 56°F13°C | 73°F23°C | 5 mph9 km/h from West | Mostly Clear | Partly Cloudy |
Yes
Low of 57°F14°C, High of 74°F24°CWind: 7 mph12 km/h
Precipitation: None