| Point Forecast: 2 Miles WSW Portola Valley CA 37.37N 122.25W (Elev. 449 m) |
Last Update: 6:22 am PDT Jul 15, 2025 |
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| Date | 07/15 | 07/16 | ||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°C) | 17 | 19 | 20 | 21 | 22 | 21 | 21 | 21 | 19 | 17 | 16 | 14 | 14 | 13 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 14 |
| Dewpoint (°C) | 12 | 13 | 13 | 13 | 14 | 13 | 13 | 13 | 13 | 12 | 11 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 9 | 10 |
| Heat Index (°C) | ||||||||||||||||||||||||
| Surface Wind (mph) | 5 | 6 | 6 | 6 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 |
| Wind Dir | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SW | SSW | SW | SW | SSW | SW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW | SSW |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 23 | 3 | 2 | 3 | 1 | 0 | 3 | 50 | 50 | 50 | 50 | 50 | 50 | 48 | 48 | 48 | 51 | 52 | 52 | 51 | 56 | 62 | 50 | 55 |
| Precipitation Potential (%) | 12 | 3 | 3 | 3 | 3 | 3 | 3 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 2 | 2 | 2 | 2 | 2 |
| Relative Humidity (%) | 72 | 68 | 65 | 62 | 62 | 62 | 61 | 64 | 68 | 73 | 75 | 72 | 73 | 75 | 71 | 72 | 72 | 73 | 75 | 74 | 75 | 78 | 78 | 78 |
| Rain | SChc | -- | -- | -- | -- | -- | -- | Chc | Chc | Chc | Chc | Chc | Chc | SChc | SChc | SChc | SChc | SChc | SChc | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/17 | |||||||||||||||||||||||
| Hour (PDT) | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Temperature (°C) | 16 | 17 | 18 | 19 | 19 | 20 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 15 |
| Dewpoint (°C) | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 | 11 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 9 | 9 | 10 |
| Heat Index (°C) | ||||||||||||||||||||||||
| Surface Wind (mph) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 5 | 3 | 3 |
| Wind Dir | SSW | SSW | SSW | SSW | SW | SW | SW | SW | SW | SW | WSW | WSW | WSW | SW | SW | SW | SW | SW | SW | SSW | SSW | SSW | S | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 28 | 11 | 11 | 11 | 4 | 4 | 4 | 5 | 5 | 5 | 13 | 13 | 13 | 25 | 25 | 25 | 36 | 36 | 36 | 44 | 44 | 44 | 34 | 34 |
| Precipitation Potential (%) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 78 | 73 | 69 | 66 | 65 | 65 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 71 | 70 | 70 | 69 | 69 | 70 | 71 | 73 | 75 | 75 | 73 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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