| Point Forecast: 5 Miles SSW Saint Helena CA 38.44N 122.5W (Elev. 1398 ft) |
Last Update: 9:36 pm PDT Jul 21, 2026 |
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| Date | 07/21 | 07/22 | ||||||||||||||||||||||
| Hour (PDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°F) | 76 | 76 | 75 | 75 | 74 | 73 | 71 | 71 | 71 | 66 | 67 | 65 | 64 | 64 | 62 | 64 | 67 | 69 | 70 | 71 | 70 | 68 | 66 | 63 |
| Dewpoint (°F) | 49 | 55 | 57 | 59 | 59 | 59 | 57 | 56 | 56 | 54 | 58 | 59 | 62 | 62 | 61 | 62 | 63 | 62 | 62 | 62 | 61 | 60 | 60 | 57 |
| Heat Index (°F) | 76 | 76 | 75 | 75 | ||||||||||||||||||||
| Surface Wind (mph) | 9 | 8 | 7 | 7 | 7 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 |
| Wind Dir | W | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | SW | SW | SW | SW | SW | SW | SW | SW | WSW | WSW | WSW | WSW | WSW | W |
| Gust | 18 | 18 | 18 | 18 | 18 | 18 | 18 | |||||||||||||||||
| Sky Cover (%) | 3 | 13 | 28 | 54 | 57 | 43 | 47 | 53 | 63 | 66 | 77 | 70 | 65 | 55 | 41 | 20 | 13 | 7 | 2 | 3 | 3 | 6 | 9 | 35 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 38 | 49 | 54 | 57 | 60 | 62 | 62 | 60 | 60 | 65 | 72 | 82 | 93 | 96 | 97 | 92 | 87 | 80 | 76 | 75 | 74 | 74 | 80 | 82 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/23 | |||||||||||||||||||||||
| Hour (PDT) | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| Temperature (°F) | 62 | 62 | 62 | 61 | 60 | 60 | 60 | 59 | 59 | 58 | 57 | 59 | 61 | 66 | 70 | 75 | 77 | 78 | 80 | 79 | 78 | 77 | 74 | 70 |
| Dewpoint (°F) | 57 | 56 | 56 | 55 | 55 | 54 | 54 | 52 | 52 | 52 | 52 | 54 | 54 | 56 | 56 | 58 | 57 | 57 | 57 | 57 | 56 | 55 | 54 | 53 |
| Heat Index (°F) | 75 | 77 | 79 | 80 | 80 | 78 | 77 | |||||||||||||||||
| Surface Wind (mph) | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Wind Dir | W | W | W | W | W | W | W | W | W | W | W | W | W | W | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW | WSW |
| Gust | 18 | |||||||||||||||||||||||
| Sky Cover (%) | 43 | 54 | 49 | 55 | 50 | 67 | 63 | 56 | 54 | 54 | 54 | 14 | 14 | 14 | 2 | 2 | 2 | 1 | 1 | 1 | 0 | 0 | 0 | 1 |
| 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 | 82 | 81 | 81 | 82 | 81 | 80 | 78 | 76 | 80 | 82 | 83 | 78 | 69 | 62 | 56 | 51 | 48 | 46 | 46 | 46 | 47 | 51 | 55 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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