| 03:52 EST |  Overcast Fog And Mist | 8°C / 46°F | 7°C / 45°F | 93% | 1013 mb (29.91 in) | S 9 kph (S 5.8 mph) | - | 5SM |
| | KIAD 150852Z 19005KT 5SM BR OVC004 08/07 A2991 RMK AO2 SLP128 T00830067 58004 |
| 02:52 EST |  Overcast Fog And Mist | 8°C / 46°F | 7°C / 45°F | 93% | 1013 mb (29.91 in) | SSE 13 kph (SSE 8.1 mph) | - | 5SM |
| | KIAD 150752Z 20007KT 5SM BR OVC004 08/07 A2992 RMK AO2 SLP133 T00780067 |
| 01:52 EST |  Overcast Fog And Mist | 8°C / 46°F | 6°C / 43°F | 87% | 1013 mb (29.91 in) | S 11 kph (S 6.9 mph) | - | 5SM |
| | KIAD 150652Z 19006KT 5SM BR OVC004 08/06 A2992 RMK AO2 SLP131 T00780061 |
| 00:52 EST |  Overcast Fog And Mist | 7°C / 45°F | 6°C / 43°F | 93% | 1013 mb (29.91 in) | S 11 kph (S 6.9 mph) | - | 5SM |
| | KIAD 150552Z 19006KT 5SM BR OVC004 07/06 A2992 RMK AO2 SLP134 T00720061 10089 20067 55009 |
| 00:37 EST |  Overcast Fog And Mist | 7°C / 45°F | 6°C / 43°F | 93% | 1014 mb (29.94 in) | SW 9 kph (SW 5.8 mph) | - | 5SM |
| | KIAD 150537Z 22005KT 5SM BR OVC004 07/06 A2993 RMK AO2 |