| 23:53 PST |  Clear | 3°C / 37°F | 2°C / 36°F | 93% | 1025 mb (30.27 in) | S 13 kph (S 8.1 mph) | - | 10SM |
| | KALW 280753Z AUTO 18007KT 10SM CLR 03/02 A3028 RMK AO2 SLP262 T00330017 401170033 |
| 22:53 PST |  Partly Cloudy | 4°C / 39°F | 2°C / 36°F | 87% | 1025 mb (30.27 in) | S 13 kph (S 8.1 mph) | - | 10SM |
| | KALW 280653Z AUTO 18007KT 10SM SCT041 04/02 A3028 RMK AO2 SLP263 T00390022 |
| 22:08 PST |  Partly Cloudy | 4°C / 39°F | 2°C / 36°F | 87% | 1025 mb (30.27 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KALW 280608Z AUTO 18006KT 10SM FEW025 04/02 A3026 RMK AO2 |
| 21:53 PST |  Mostly Cloudy | 4°C / 39°F | 2°C / 36°F | 87% | 1025 mb (30.27 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KALW 280553Z AUTO 19006KT 10SM BKN025 04/02 A3026 RMK AO2 SLP255 T00390022 10067 20039 53012 |
| 21:33 PST |  Mostly Cloudy | 4°C / 39°F | 3°C / 37°F | 93% | 1024 mb (30.24 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KALW 280533Z AUTO 17006KT 10SM BKN023 04/03 A3025 RMK AO2 |
| 20:53 PST |  Clear | 4°C / 39°F | 3°C / 37°F | 93% | 1024 mb (30.24 in) | S 13 kph (S 8.1 mph) | - | 10SM |
| | KALW 280453Z AUTO 17007KT 10SM CLR 04/03 A3025 RMK AO2 SLP251 T00440028 |
| 19:53 PST |  Clear | 5°C / 41°F | 3°C / 37°F | 87% | 1024 mb (30.24 in) | SSE 13 kph (SSE 8.1 mph) | - | 10SM |
| | KALW 280353Z AUTO 15007KT 10SM CLR 05/03 A3023 RMK AO2 SLP245 T00500028 |
| 18:53 PST |  Mostly Cloudy | 5°C / 41°F | 3°C / 37°F | 87% | 1024 mb (30.24 in) | SSE 15 kph (SSE 9.2 mph) | - | 10SM |
| | KALW 280253Z AUTO 16008KT 10SM FEW018 BKN030 05/03 A3023 RMK AO2 SLP243 T00500033 53021 |
| 18:22 PST |  Overcast | 5°C / 41°F | 3°C / 37°F | 87% | 1023 mb (30.21 in) | S 13 kph (S 8.1 mph) | - | 10SM |
| | KALW 280222Z 18007KT 10SM FEW019 OVC030 05/03 A3022 RMK AO2 |
| 17:53 PST |  Overcast | 6°C / 43°F | 4°C / 39°F | 87% | 1023 mb (30.21 in) | S 11 kph (S 6.9 mph) | - | 10SM |
| | KALW 280153Z 18006KT 10SM OVC028 06/04 A3021 RMK AO2 SLP237 T00560039 |
| 16:53 PST |  Partly Cloudy | 5°C / 41°F | 3°C / 37°F | 87% | 1022 mb (30.18 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KALW 280053Z 15005KT 10SM FEW032 05/03 A3017 RMK AO2 SLP225 T00500033 |
| 16:15 PST |  Partly Cloudy | 6°C / 43°F | 4°C / 39°F | 87% | 1022 mb (30.18 in) | SSE 7 kph (SSE 4.6 mph) | - | 10SM |
| | KALW 280015Z 16004KT 10SM SCT024 06/04 A3017 RMK AO2 |
| 15:53 PST |  Overcast | 7°C / 45°F | 4°C / 39°F | 81% | 1021 mb (30.15 in) | SSE 9 kph (SSE 5.8 mph) | - | 10SM |
| | KALW 272353Z 15005KT 10SM OVC028 07/04 A3016 RMK AO2 SLP220 T00670044 10072 20044 53024 |
| 15:25 PST |  Overcast | 7°C / 45°F | 4°C / 39°F | 81% | 1021 mb (30.15 in) | S 7 kph (S 4.6 mph) | - | 10SM |
| | KALW 272325Z 17004KT 10SM OVC028 07/04 A3015 RMK AO2 |
| 14:53 PST |  Partly Cloudy | 7°C / 45°F | 4°C / 39°F | 81% | 1020 mb (30.12 in) | S 6 kph (S 3.5 mph) | - | 10SM |
| | KALW 272253Z 19003KT 10SM FEW011 SCT030 07/04 A3013 RMK AO2 SLP210 T00670044 |
| 14:43 PST |  Partly Cloudy | 7°C / 45°F | 4°C / 39°F | 81% | 1020 mb (30.12 in) | SSE 7 kph (SSE 4.6 mph) | - | 10SM |
| | KALW 272243Z 20004KT 10SM FEW009 SCT023 07/04 A3013 RMK AO2 |
| 14:27 PST |  Mostly Cloudy | 7°C / 45°F | 4°C / 39°F | 81% | 1020 mb (30.12 in) | SW 7 kph (SW 4.6 mph) | - | 10SM |
| | KALW 272227Z 21004KT 10SM FEW009 BKN021 07/04 A3012 RMK AO2 |
| 13:53 PST |  Mostly Cloudy | 7°C / 45°F | 4°C / 39°F | 81% | 1020 mb (30.12 in) | S 6 kph (S 3.5 mph) | - | 10SM |
| | KALW 272153Z 19003KT 10SM BKN019 07/04 A3011 RMK AO2 SLP201 T00670044 |
| 12:53 PST |  Overcast | 6°C / 43°F | 4°C / 39°F | 87% | 1019 mb (30.09 in) | SSE 6 kph (SSE 3.5 mph) | - | 10SM |
| | KALW 272053Z 20003KT 10SM OVC021 06/04 A3009 RMK AO2 SLP192 T00560044 53016 |
| 12:09 PST |  Overcast | 6°C / 43°F | 4°C / 39°F | 87% | 1018 mb (30.06 in) | S 9 kph (S 5.8 mph) | - | 9SM |
| | KALW 272009Z 17005KT 9SM SCT003 OVC021 06/04 A3007 RMK AO2 |
| 11:53 PST |  Overcast Fog And Mist | 5°C / 41°F | 4°C / 39°F | 93% | 1018 mb (30.06 in) | S 11 kph (S 6.9 mph) | - | 6SM |
| | KALW 271953Z 18006KT 6SM BR BKN003 OVC021 05/04 A3007 RMK AO2 CIG 003V007 SLP188 T00500044 |
| 10:53 PST |  Overcast | 5°C / 41°F | 4°C / 39°F | 93% | 1018 mb (30.06 in) | SSE 6 kph (SSE 3.5 mph) | - | 9SM |
| | KALW 271853Z 20003KT 9SM BKN003 OVC024 05/04 A3005 RMK AO2 SLP182 T00500039 |
| 10:31 PST |  Overcast | 5°C / 41°F | 4°C / 39°F | 93% | 1017 mb (30.03 in) | SSE 6 kph (SSE 3.5 mph) | - | 8SM |
| | KALW 271831Z 20003KT 8SM SCT001 OVC024 05/04 A3004 RMK AO2 |
| 09:53 PST |  Overcast Fog And Mist | 4°C / 39°F | 4°C / 39°F | 100% | 1017 mb (30.03 in) | SW 11 kph (SW 6.9 mph) | 0.00 mm (0.00 in) | 3SM |
| | KALW 271753Z 23006KT 3SM BR OVC001 04/04 A3004 RMK AO2 RAE53 SLP179 P0000 60032 T00440039 10056 20039 53026 |
| 09:00 PST |  Overcast Light Rain | 4°C / 39°F | 4°C / 39°F | 100% | 1016 mb (30 in) | S 11 kph (S 6.9 mph) | 0.00 mm (0.00 in) | 3SM |
| | KALW 271700Z 19006KT 3SM -RA BR OVC001 04/04 A3001 RMK AO2 P0000 |
| 08:53 PST |  Overcast Light Rain | 4°C / 39°F | 4°C / 39°F | 100% | 1016 mb (30 in) | S 13 kph (S 8.1 mph) | 1.27 mm (0.05 in) | 2 1/2SM |
| | KALW 271653Z 19007KT 2 1/2SM -RA BR OVC001 04/04 A3000 RMK AO2 SLP168 P0005 T00440039 |
| 07:53 PST |  Overcast Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1016 mb (30 in) | SSE 11 kph (SSE 6.9 mph) | 2.29 mm (0.09 in) | 2 1/2SM |
| | KALW 271553Z 20006KT 2 1/2SM RA BR OVC001 04/03 A2999 RMK AO2 SLP163 P0009 T00390033 |
| 07:18 PST |  Overcast Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1015 mb (29.97 in) | S 15 kph (S 9.2 mph) | 1.02 mm (0.04 in) | 3SM |
| | KALW 271518Z 18008KT 3SM RA BR OVC001 04/03 A2997 RMK AO2 P0004 |
| 06:53 PST |  Overcast Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1015 mb (29.97 in) | S 17 kph (S 10.4 mph) | 2.29 mm (0.09 in) | 2SM |
| | KALW 271453Z 19009KT 2SM RA BR OVC001 04/03 A2996 RMK AO2 SLP154 P0009 60018 T00390033 53026 |
| 06:40 PST |  Overcast Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1014 mb (29.94 in) | S 15 kph (S 9.2 mph) | 1.78 mm (0.07 in) | 2 1/2SM |
| | KALW 271440Z 19008KT 2 1/2SM RA BR OVC001 04/03 A2995 RMK AO2 P0007 |
| 05:53 PST |  Overcast Light Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1014 mb (29.94 in) | S 11 kph (S 6.9 mph) | 1.78 mm (0.07 in) | 1 1/2SM |
| | KALW 271353Z AUTO 19006KT 1 1/2SM -RA BR OVC001 04/03 A2993 RMK AO2 SLP142 P0007 T00390033 |
| 05:23 PST |  Overcast Rain | 4°C / 39°F | 3°C / 37°F | 93% | 1013 mb (29.91 in) | S 11 kph (S 6.9 mph) | 1.02 mm (0.04 in) | 1 1/4SM |
| | KALW 271323Z AUTO 19006KT 1 1/4SM RA BR OVC001 04/03 A2991 RMK AO2 P0004 |
| 05:03 PST |  Obscured Rain | 4°C / 39°F | 4°C / 39°F | 100% | 1013 mb (29.91 in) | SSE 13 kph (SSE 8.1 mph) | 0.25 mm (0.01 in) | 1/2SM |
| | KALW 271303Z AUTO 20007KT 1/2SM RA FG VV001 04/04 A2991 RMK AO2 P0001 |
| 04:53 PST |  Obscured Light Rain | 4°C / 39°F | 4°C / 39°F | 100% | 1013 mb (29.91 in) | SW 11 kph (SW 6.9 mph) | 0.51 mm (0.02 in) | 1/2SM |
| | KALW 271253Z AUTO 21006KT 1/2SM -RA FG VV002 04/04 A2990 RMK AO2 SLP132 P0002 T00440039 |
| 04:30 PST |  Overcast Light Rain | 5°C / 41°F | 4°C / 39°F | 93% | 1012 mb (29.88 in) | SW 7 kph (SW 4.6 mph) | 0.25 mm (0.01 in) | 1 3/4SM |
| | KALW 271230Z AUTO 21004KT 1 3/4SM -RA BR BKN004 OVC042 05/04 A2989 RMK AO2 P0001 |
| 04:19 PST |  Overcast Light Rain | 5°C / 41°F | 4°C / 39°F | 93% | 1012 mb (29.88 in) | SW 6 kph (SW 3.5 mph) | 0.25 mm (0.01 in) | 2 1/2SM |
| | KALW 271219Z AUTO 22003KT 2 1/2SM -RA BR BKN006 BKN044 OVC060 05/04 A2989 RMK AO2 P0001 |
| 04:16 PST |  Overcast Light Rain | 5°C / 41°F | 4°C / 39°F | 93% | 1012 mb (29.88 in) | SW 7 kph (SW 4.6 mph) | 0.25 mm (0.01 in) | 3SM |
| | KALW 271216Z AUTO 22004KT 3SM -RA BR SCT006 BKN044 OVC060 05/04 A2989 RMK AO2 P0001 |
| 03:53 PST |  Overcast Light Rain | 6°C / 43°F | 4°C / 39°F | 87% | 1012 mb (29.88 in) | SE 11 kph (SE 6.9 mph) | 0.25 mm (0.01 in) | 3SM |
| | KALW 271153Z AUTO 14006KT 3SM -RA BR BKN042 OVC060 06/04 A2988 RMK AO2 RAE11B33 SLP125 P0001 60008 70008 T00560044 10117 20056 51014 |
| 02:53 PST |  Overcast Light Rain | 6°C / 43°F | 4°C / 39°F | 87% | 1012 mb (29.88 in) | SE 7 kph (SE 4.6 mph) | 0.76 mm (0.03 in) | 5SM |
| | KALW 271053Z AUTO 13004KT 5SM -RA BR OVC050 06/04 A2988 RMK AO2 SLP124 P0003 T00610044 |
| 01:53 PST |  Overcast Light Rain | 8°C / 46°F | 5°C / 41°F | 82% | 1012 mb (29.88 in) | SSW 15 kph (SSW 9.2 mph) | 0.00 mm (0.00 in) | 10SM |
| | KALW 270953Z AUTO 24008KT 10SM -RA OVC070 08/05 A2987 RMK AO2 RAB23 SLP120 P0000 T00780050 |
| 00:53 PST |  Partly Cloudy | 12°C / 54°F | 4°C / 39°F | 58% | 1010 mb (29.83 in) | S 26 kph (S 16.1 mph) | 0.25 mm (0.01 in) | 10SM |
| | KALW 270853Z AUTO 17014G22KT 10SM FEW060 12/04 A2984 RMK AO2 RAE33 SLP108 P0001 60004 T01170044 58031 |