| Point Forecast: Napa CA 38.29N 122.29W (Elev. 20 ft) |
Last Update: 11:26 am PDT Jul 18, 2026 |
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| Date | 07/18 | 07/19 | ||||||||||||||||||||||
| Hour (PDT) | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 |
| Temperature (°F) | 65 | 69 | 74 | 77 | 79 | 80 | 79 | 77 | 74 | 68 | 64 | 60 | 58 | 58 | 57 | 56 | 55 | 55 | 55 | 54 | 54 | 56 | 58 | 63 |
| Dewpoint (°F) | 55 | 56 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 55 | 55 | 54 | 54 | 54 | 54 | 53 | 52 | 52 | 52 | 52 | 52 | 53 | 53 | 54 |
| Heat Index (°F) | 77 | 79 | 80 | 79 | 77 | |||||||||||||||||||
| Surface Wind (mph) | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 7 | 6 | 6 | 6 | 5 | 5 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 2 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SSW | SSW | SW | SW | S | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 20 | 5 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 2 | 3 | 14 | 33 | 56 | 83 | 82 | 87 | 90 | 86 | 84 | 74 | 59 | 38 |
| 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 (%) | 70 | 62 | 56 | 51 | 48 | 48 | 48 | 50 | 55 | 63 | 73 | 81 | 86 | 88 | 89 | 90 | 91 | 91 | 91 | 92 | 93 | 90 | 81 | 72 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/20 | |||||||||||||||||||||||
| Hour (PDT) | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 |
| Temperature (°F) | 68 | 73 | 76 | 79 | 80 | 79 | 78 | 77 | 73 | 69 | 66 | 63 | 62 | 61 | 60 | 60 | 59 | 59 | 58 | 57 | 57 | 58 | 60 | 63 |
| Dewpoint (°F) | 55 | 57 | 58 | 58 | 59 | 58 | 58 | 58 | 57 | 56 | 56 | 55 | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 54 | 55 | 56 | 56 |
| Heat Index (°F) | 76 | 79 | 81 | 80 | 79 | 77 | ||||||||||||||||||
| Surface Wind (mph) | 3 | 5 | 6 | 7 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW | SW | SW | SW | SW | SW | SW | SW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 29 | 14 | 34 | 32 | 17 | 30 | 47 | 47 | 47 | 52 | 52 | 52 | 56 | 56 | 56 | 67 | 67 | 67 | 74 | 74 | 74 | 86 | 86 | 86 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 64 | 57 | 52 | 49 | 48 | 48 | 50 | 53 | 58 | 64 | 71 | 75 | 78 | 79 | 81 | 83 | 83 | 84 | 85 | 87 | 89 | 88 | 84 | 78 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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