| Point Forecast: Napa CA 38.29N 122.29W (Elev. 6 m) |
Last Update: 1:52 am PDT Aug 8, 2026 |
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| Date | 08/08 | 08/09 | ||||||||||||||||||||||
| Hour (PDT) | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 |
| Temperature (°C) | 14 | 14 | 14 | 14 | 15 | 17 | 19 | 22 | 24 | 26 | 28 | 29 | 29 | 29 | 28 | 26 | 24 | 21 | 19 | 18 | 17 | 17 | 16 | 16 |
| Dewpoint (°C) | 13 | 12 | 13 | 13 | 13 | 14 | 15 | 15 | 16 | 16 | 17 | 17 | 17 | 17 | 16 | 17 | 17 | 15 | 15 | 14 | 14 | 14 | 13 | 13 |
| Heat Index (°C) | 24 | 27 | 28 | 29 | 29 | 30 | 28 | 26 | 24 | |||||||||||||||
| Surface Wind (mph) | 2 | 2 | 2 | 1 | 2 | 2 | 2 | 5 | 6 | 6 | 7 | 7 | 8 | 7 | 6 | 5 | 5 | 5 | 3 | 3 | 2 | 2 | 1 | 1 |
| Wind Dir | SSW | SSW | SSW | SSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | S | S | SSW | S | S | SSW | SSW | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 56 | 61 | 71 | 72 | 74 | 64 | 47 | 17 | 10 | 7 | 3 | 2 | 3 | 1 | 1 | 2 | 2 | 6 | 9 | 11 | 16 | 19 | 26 | 39 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 89 | 90 | 91 | 94 | 90 | 82 | 74 | 65 | 59 | 53 | 50 | 48 | 49 | 49 | 49 | 56 | 64 | 72 | 77 | 82 | 82 | 83 | 84 | 85 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/10 | |||||||||||||||||||||||
| Hour (PDT) | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 |
| Temperature (°C) | 16 | 15 | 16 | 16 | 17 | 19 | 22 | 26 | 28 | 30 | 32 | 32 | 32 | 31 | 29 | 27 | 24 | 22 | 19 | 18 | 17 | 17 | 16 | 15 |
| Dewpoint (°C) | 13 | 12 | 13 | 13 | 13 | 14 | 15 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 15 | 14 | 14 | 14 | 13 | 13 |
| Heat Index (°C) | 26 | 28 | 30 | 32 | 32 | 32 | 31 | 29 | 27 | 24 | ||||||||||||||
| Surface Wind (mph) | 1 | 0 | 0 | 0 | 0 | 1 | 2 | 5 | 5 | 5 | 7 | 7 | 7 | 7 | 7 | 7 | 5 | 5 | 5 | 3 | 3 | 3 | 2 | 2 |
| Wind Dir | S | N | N | N | WSW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 42 | 48 | 55 | 55 | 50 | 44 | 21 | 5 | 5 | 5 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 10 | 10 | 10 | 28 | 28 |
| 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 (%) | 85 | 84 | 85 | 87 | 82 | 72 | 63 | 56 | 50 | 46 | 43 | 42 | 43 | 43 | 45 | 52 | 60 | 68 | 74 | 80 | 82 | 84 | 85 | 87 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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