| Point Forecast: Fontana CA 34.1N 117.43W (Elev. 1296 ft) |
Last Update: 12:17 pm PDT Aug 15, 2026 |
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| Date | 08/15 | 08/16 | ||||||||||||||||||||||
| Hour (PDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°F) | 74 | 73 | 71 | 70 | 68 | 68 | 67 | 66 | 66 | 67 | 69 | 74 | 77 | 81 | 84 | 88 | 90 | 91 | 92 | 92 | 90 | 87 | 81 | 78 |
| Dewpoint (°F) | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 60 | 58 | 58 | 58 | 58 | 59 | 59 | 59 | 59 | 59 |
| Heat Index (°F) | 77 | 82 | 84 | 87 | 89 | 90 | 91 | 91 | 89 | 86 | 82 | 79 | ||||||||||||
| Surface Wind (mph) | 6 | 5 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 9 | 9 | 9 | 8 | 7 | 6 |
| Wind Dir | W | SW | W | SW | SW | SW | W | SW | SW | SW | S | SW | SW | SW | SW | SW | SW | SW | SW | W | SW | SW | SW | SW |
| Gust | 18 | 20 | 20 | 20 | ||||||||||||||||||||
| Sky Cover (%) | 36 | 31 | 31 | 31 | 34 | 34 | 34 | 41 | 41 | 41 | 42 | 42 | 42 | 22 | 22 | 22 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Precipitation Potential (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 67 | 70 | 74 | 77 | 82 | 83 | 84 | 86 | 85 | 84 | 78 | 68 | 60 | 52 | 44 | 37 | 34 | 33 | 32 | 34 | 35 | 38 | 46 | 51 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 08/17 | |||||||||||||||||||||||
| Hour (PDT) | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| Temperature (°F) | 76 | 75 | 73 | 72 | 71 | 70 | 69 | 69 | 68 | 69 | 71 | 74 | 78 | 82 | 86 | 89 | 91 | 93 | 93 | 92 | 90 | 86 | 83 | 80 |
| Dewpoint (°F) | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 60 | 60 | 61 | 61 | 61 | 61 | 61 | 60 | 59 | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 59 |
| Heat Index (°F) | 76 | 75 | 78 | 83 | 86 | 88 | 90 | 92 | 93 | 92 | 89 | 86 | 83 | 81 | ||||||||||
| Surface Wind (mph) | 5 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 3 | 5 | 6 | 7 | 8 | 9 | 9 | 8 | 7 | 6 | 5 |
| Wind Dir | SW | W | W | W | SW | SW | W | W | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW |
| Gust | 20 | 21 | 21 | 18 | ||||||||||||||||||||
| Sky Cover (%) | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 30 | 30 | 30 | 30 | 30 | 30 | 16 | 16 | 16 | 16 | 16 | 16 | 21 | 21 | 21 | 21 | 21 |
| 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 (%) | 54 | 57 | 62 | 66 | 69 | 72 | 74 | 75 | 76 | 74 | 71 | 64 | 56 | 48 | 42 | 37 | 34 | 32 | 32 | 34 | 36 | 41 | 46 | 49 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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