| 04:53 PST |  Overcast Light Rain | 2°C / 36°F | 1°C / 34°F | 93% | 1015 mb (29.97 in) | WNW 6 kph (WNW 3.5 mph) | 0.25 mm (0.01 in) | 9SM |
| | KSEA 221253Z 29003KT 9SM -RA SCT010 BKN016 OVC021 02/01 A2996 RMK AO2 RAB25 SLP153 P0001 T00220006 |
| 04:36 PST |  Overcast Light Rain | 3°C / 37°F | 1°C / 34°F | 87% | 1014 mb (29.94 in) | S 6 kph (S 3.5 mph) | 0.00 mm (0.00 in) | 8SM |
| | KSEA 221236Z 17003KT 8SM -RA BKN016 OVC022 03/01 A2994 RMK AO2 RAB25 P0000 |
| 03:53 PST |  Overcast | 3°C / 37°F | 1°C / 34°F | 87% | 1014 mb (29.94 in) | S 7 kph (S 4.6 mph) | 0.00 mm (0.00 in) | 10SM |
| | KSEA 221153Z 17004KT 10SM BKN013 BKN020 OVC026 03/01 A2993 RMK AO2 RAE42 SLP143 P0000 60000 70014 T00280006 10033 20028 52027 |
| 03:26 PST |  Overcast Light Rain | 3°C / 37°F | 1°C / 34°F | 87% | 1013 mb (29.91 in) | SSE 11 kph (SSE 6.9 mph) | 0.00 mm (0.00 in) | 10SM |
| | KSEA 221126Z 16006KT 10SM -RA BKN017 BKN022 OVC028 03/01 A2991 RMK AO2 P0000 |
| 02:53 PST |  Overcast Light Rain | 3°C / 37°F | 1°C / 34°F | 87% | 1013 mb (29.91 in) | SSE 13 kph (SSE 8.1 mph) | 0.00 mm (0.00 in) | 8SM |
| | KSEA 221053Z 16007KT 8SM -RA BKN011 OVC019 03/01 A2990 RMK AO2 RAB09E20B37 SLP134 P0000 T00280011 |
| 01:53 PST |  Overcast | 3°C / 37°F | 1°C / 34°F | 87% | 1012 mb (29.88 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KSEA 220953Z 16005KT 10SM BKN011 OVC018 03/01 A2987 RMK AO2 SLP124 T00280006 |
| 01:31 PST |  Overcast | 3°C / 37°F | 1°C / 34°F | 87% | 1011 mb (29.85 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KSEA 220931Z 17006KT 10SM OVC015 03/01 A2986 RMK AO2 |
| 00:53 PST |  Overcast | 3°C / 37°F | 1°C / 34°F | 87% | 1011 mb (29.85 in) | S 15 kph (S 9.2 mph) | - | 10SM |
| | KSEA 220853Z 19008G17KT 10SM BKN013 OVC019 03/01 A2985 RMK AO2 SLP116 T00330006 52013 |
| 00:35 PST |  Overcast | 3°C / 37°F | 1°C / 34°F | 87% | 1010 mb (29.83 in) | S 17 kph (S 10.4 mph) | - | 10SM |
| | KSEA 220835Z 19009KT 10SM OVC013 03/01 A2984 RMK AO2 |