| Local Time | Sun May 19 | Mon May 20 | Tue May 21 | Wed May 22 |
| UV index | 4 | 3 | 4 | 4 |
The strength of the sun's ultraviolet (UV) radiation is expressed as a Solar UV Index or Sun Index.The UV Index does not exceed 8 in the UK (8 is rare; 7 may occur on exceptional days, mostly in the two weeks around the summer solstice). Indices of 9 and 10 are common in the Mediterranean area. The Sun Index forecast refers to the daily maximum. |
| Nearby Weather Stations - Niles | Distance |
| Youngstown-Warren Regional Airport | 11.6 km |
| New Castle Airport | 34.7 km |
| Beaver | 54.9 km |
| Akron Fulton Intl. Airport | 62.4 km |
| Akron-Canton Airport | 64.6 km |
| Ashtabula | 65.2 km |
| Port Meadville Airport | 66.6 km |
| Cuyahoga | 74.7 km |
| Venango Regional Airport | 77.2 km |
| Butler | 80.6 km |
| Pittsburgh Intl. Airport | 84.4 km |
| Cleveland Burke Lakefront Airport | 86.4 km |
| Harry Clever Field Airport | 97.6 km |
| Erie Intl. Airport | 110.7 km |
| Wheeling Ohio | 111.6 km |
| Allegheny | 115.5 km |