| Point Forecast: Napa CA 38.29N 122.29W (Elev. 20 ft) |
Last Update: 1:26 pm PDT Aug 17, 2026 |
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| Date | 08/17 | 08/18 | ||||||||||||||||||||||
| Hour (PDT) | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 |
| Temperature (°F) | 76 | 78 | 78 | 77 | 75 | 73 | 67 | 64 | 62 | 60 | 60 | 59 | 58 | 58 | 57 | 56 | 56 | 55 | 57 | 59 | 64 | 68 | 72 | 76 |
| Dewpoint (°F) | 61 | 61 | 62 | 61 | 61 | 61 | 59 | 58 | 57 | 57 | 56 | 56 | 55 | 55 | 54 | 54 | 54 | 54 | 55 | 55 | 58 | 58 | 59 | 61 |
| Heat Index (°F) | 76 | 78 | 78 | 77 | 75 | 76 | ||||||||||||||||||
| Surface Wind (mph) | 8 | 8 | 8 | 7 | 6 | 6 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 5 | 5 | 6 |
| Wind Dir | SSW | SSW | SSW | SSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SSW | SSW | SW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 5 | 1 | 10 | 4 | 16 | 21 | 28 | 47 | 52 | 66 | 86 | 79 | 80 | 85 | 86 | 83 | 84 | 85 | 83 | 70 | 50 | 46 | 24 | 25 |
| 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 (%) | 59 | 58 | 57 | 57 | 61 | 66 | 74 | 80 | 85 | 88 | 88 | 90 | 90 | 91 | 91 | 92 | 92 | 96 | 94 | 87 | 80 | 72 | 64 | 59 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/19 | |||||||||||||||||||||||
| Hour (PDT) | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 |
| Temperature (°F) | 79 | 80 | 81 | 80 | 78 | 75 | 70 | 66 | 64 | 62 | 62 | 60 | 59 | 59 | 58 | 57 | 58 | 58 | 59 | 61 | 65 | 69 | 73 | 77 |
| Dewpoint (°F) | 61 | 62 | 63 | 62 | 62 | 61 | 59 | 59 | 58 | 58 | 57 | 57 | 56 | 56 | 56 | 54 | 56 | 56 | 56 | 57 | 58 | 59 | 60 | 61 |
| Heat Index (°F) | 79 | 81 | 82 | 81 | 78 | 75 | 77 | |||||||||||||||||
| Surface Wind (mph) | 6 | 7 | 7 | 7 | 6 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 5 | 5 | 5 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | WSW | WSW | WSW | WSW | WSW | WSW | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 23 | 30 | 20 | 18 | 30 | 30 | 42 | 38 | 30 | 52 | 52 | 52 | 68 | 68 | 68 | 76 | 76 | 76 | 77 | 77 | 77 | 24 | 24 | 24 |
| 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 (%) | 54 | 53 | 54 | 54 | 57 | 62 | 69 | 76 | 81 | 85 | 85 | 87 | 88 | 90 | 90 | 90 | 92 | 93 | 92 | 86 | 78 | 70 | 63 | 58 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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