| Point Forecast: Napa CA 38.29N 122.29W (Elev. 20 ft) |
Last Update: 1:26 am PDT Sep 6, 2026 |
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| Date | 09/06 | 09/07 | ||||||||||||||||||||||
| Hour (PDT) | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 |
| Temperature (°F) | 56 | 55 | 54 | 53 | 53 | 53 | 54 | 56 | 60 | 64 | 69 | 72 | 73 | 75 | 74 | 74 | 73 | 69 | 65 | 63 | 61 | 60 | 59 | 58 |
| Dewpoint (°F) | 52 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 54 | 54 | 55 | 54 | 55 | 56 | 56 | 55 | 55 | 54 | 55 | 54 | 54 | 54 | 53 | 52 |
| Heat Index (°F) | 75 | |||||||||||||||||||||||
| Surface Wind (mph) | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 5 | 6 | 7 | 8 | 9 | 9 | 9 | 9 | 8 | 6 | 5 | 2 | 2 | 1 | 0 | 0 |
| Wind Dir | SSW | SSW | S | SSW | S | SSW | SW | SW | SW | SW | SW | SW | SW | SW | WSW | SW | WSW | SW | SSW | SSW | SSW | SSW | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 25 | 31 | 30 | 33 | 45 | 61 | 61 | 62 | 31 | 14 | 8 | 0 | 1 | 1 | 0 | 2 | 4 | 2 | 1 | 5 | 4 | 6 | 14 | 12 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 88 | 89 | 90 | 92 | 94 | 94 | 94 | 87 | 78 | 69 | 61 | 55 | 52 | 51 | 52 | 51 | 53 | 60 | 70 | 74 | 78 | 81 | 81 | 83 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/08 | |||||||||||||||||||||||
| Hour (PDT) | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 |
| Temperature (°F) | 57 | 56 | 55 | 55 | 54 | 54 | 56 | 59 | 64 | 68 | 74 | 77 | 79 | 82 | 81 | 80 | 79 | 74 | 70 | 67 | 65 | 64 | 62 | 61 |
| Dewpoint (°F) | 52 | 51 | 50 | 50 | 49 | 48 | 50 | 50 | 52 | 52 | 54 | 54 | 53 | 53 | 52 | 51 | 52 | 52 | 52 | 52 | 51 | 51 | 50 | 49 |
| Heat Index (°F) | 77 | 79 | 81 | 80 | 80 | 79 | ||||||||||||||||||
| Surface Wind (mph) | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 2 | 2 | 2 | 0 | 0 | 0 |
| Wind Dir | N | N | N | N | N | N | N | N | N | SW | SW | SW | SW | SW | SW | WSW | WSW | WSW | W | W | W | N | N | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 16 | 21 | 26 | 38 | 38 | 38 | 30 | 30 | 30 | 5 | 5 | 5 | 0 | 0 | 0 | 3 | 3 | 3 | 0 | 0 | 0 | 2 | 2 | 2 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 84 | 85 | 84 | 84 | 82 | 82 | 78 | 72 | 64 | 57 | 50 | 44 | 40 | 36 | 36 | 36 | 39 | 46 | 54 | 59 | 62 | 63 | 65 | 66 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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