| Point Forecast: 2 Miles WSW Portola Valley CA 37.37N 122.25W (Elev. 1473 ft) |
Last Update: 1:25 pm PDT May 16, 2025 |
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| Date | 05/16 | 05/17 | ||||||||||||||||||||||
| 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) | 51 | 50 | 50 | 50 | 50 | 49 | 49 | 48 | 48 | 49 | 49 | 49 | 50 | 51 | 52 | 54 | 54 | 55 | 55 | 55 | 54 | 53 | 52 | 50 |
| Dewpoint (°F) | 43 | 43 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 44 | 46 | 46 | 46 | 47 | 47 | 47 | 48 | 48 | 48 | 47 | 46 | 45 | 44 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 14 | 13 | 13 | 14 | 14 | 14 | 14 | 15 | 15 | 16 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 20 | 21 | 21 | 21 | 21 | 21 | 18 |
| Wind Dir | WSW | WSW | W | W | W | W | W | W | W | W | W | W | W | W | W | WNW | WNW | W | W | W | W | W | WNW | WNW |
| Gust | 21 | 20 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 28 | 29 | 30 | 31 | 30 | 30 | 31 | 31 | 32 | 33 | 34 | 34 | 34 | 34 | 34 |
| Sky Cover (%) | 29 | 30 | 40 | 54 | 65 | 74 | 71 | 78 | 80 | 83 | 78 | 74 | 69 | 50 | 37 | 37 | 34 | 35 | 41 | 33 | 42 | 35 | 32 | 42 |
| Precipitation Potential (%) | 1 | 1 | 5 | 5 | 5 | 5 | 5 | 5 | 9 | 9 | 9 | 9 | 9 | 9 | 7 | 7 | 7 | 7 | 7 | 7 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 75 | 77 | 80 | 80 | 82 | 84 | 84 | 85 | 86 | 85 | 83 | 88 | 85 | 85 | 82 | 78 | 77 | 77 | 77 | 77 | 76 | 76 | 78 | 78 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/18 | |||||||||||||||||||||||
| 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) | 50 | 50 | 49 | 49 | 48 | 47 | 46 | 46 | 46 | 46 | 48 | 50 | 52 | 55 | 58 | 59 | 60 | 61 | 61 | 60 | 59 | 57 | 55 | 54 |
| Dewpoint (°F) | 43 | 43 | 43 | 42 | 42 | 41 | 40 | 40 | 40 | 40 | 41 | 42 | 42 | 43 | 43 | 44 | 44 | 45 | 44 | 44 | 44 | 43 | 42 | 42 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 17 | 17 | 16 | 16 | 16 | 14 | 14 | 14 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 17 | 17 | 17 | 20 | 20 | 20 | 18 |
| Wind Dir | WNW | W | W | W | W | WNW | WNW | WNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NNW | NW | NW | NW | WNW | WNW | WNW | NW |
| Gust | 32 | 30 | 26 | 26 | 26 | 22 | 22 | 22 | 18 | 18 | 18 | 18 | 18 | 18 | 22 | 22 | 22 | 29 | 29 | 29 | 32 | 32 | 32 | 31 |
| Sky Cover (%) | 31 | 24 | 16 | 16 | 16 | 11 | 11 | 11 | 11 | 11 | 11 | 8 | 8 | 8 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 4 |
| 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 (%) | 78 | 78 | 78 | 78 | 79 | 79 | 80 | 80 | 80 | 78 | 76 | 73 | 68 | 63 | 59 | 57 | 56 | 55 | 55 | 55 | 57 | 59 | 62 | 64 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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