| Point Forecast: Prosser WA 46.22N 119.79W (Elev. 715 ft) |
Last Update: 3:00 pm PDT Sep 15, 2026 |
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| Date | 09/15 | 09/16 | ||||||||||||||||||||||
| Hour (PDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 68 | 65 | 62 | 58 | 56 | 55 | 53 | 52 | 52 | 51 | 49 | 49 | 49 | 48 | 52 | 56 | 62 | 66 | 68 | 70 | 72 | 72 | 73 | 76 |
| Dewpoint (°F) | 55 | 57 | 59 | 56 | 55 | 54 | 53 | 52 | 52 | 51 | 49 | 49 | 49 | 48 | 51 | 51 | 52 | 53 | 53 | 53 | 53 | 53 | 53 | 55 |
| Heat Index (°F) | 76 | |||||||||||||||||||||||
| Surface Wind (mph) | 3 | 2 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 3 | 5 | 6 | 6 | 7 | 7 | 7 | 5 |
| Wind Dir | N | N | NW | NW | NW | NW | W | NW | NW | W | NW | W | W | W | W | NW | N | N | N | NE | NE | NE | NE | N |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 89 | 78 | 86 | 88 | 69 | 35 | 36 | 21 | 18 | 15 | 15 | 12 | 20 | 19 | 9 | 1 | 3 | 2 | 0 | 1 | 0 | 0 | 0 | 4 |
| Precipitation Potential (%) | 9 | 9 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Relative Humidity (%) | 64 | 74 | 90 | 93 | 95 | 95 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 97 | 83 | 71 | 64 | 58 | 54 | 52 | 51 | 50 | 48 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 09/17 | |||||||||||||||||||||||
| Hour (PDT) | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| Temperature (°F) | 74 | 71 | 66 | 61 | 59 | 58 | 56 | 55 | 53 | 52 | 51 | 51 | 49 | 51 | 54 | 58 | 63 | 68 | 71 | 73 | 75 | 77 | 78 | 78 |
| Dewpoint (°F) | 55 | 56 | 56 | 53 | 51 | 51 | 51 | 50 | 49 | 48 | 47 | 47 | 45 | 47 | 48 | 49 | 49 | 49 | 49 | 49 | 50 | 51 | 52 | 54 |
| Heat Index (°F) | 75 | 77 | 78 | 78 | ||||||||||||||||||||
| Surface Wind (mph) | 5 | 5 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 1 | 1 | 2 |
| Wind Dir | N | N | N | N | N | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | NW | W | W | W | S |
| Gust | ||||||||||||||||||||||||
| Sky Cover (%) | 4 | 4 | 3 | 3 | 3 | 14 | 14 | 14 | 9 | 9 | 9 | 9 | 9 | 9 | 27 | 27 | 27 | 35 | 35 | 35 | 45 | 45 | 45 | 39 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 4 | 4 | 4 | 4 | 4 | 8 |
| Relative Humidity (%) | 52 | 60 | 70 | 74 | 76 | 78 | 83 | 84 | 85 | 85 | 85 | 86 | 87 | 86 | 81 | 72 | 61 | 51 | 45 | 42 | 41 | 40 | 40 | 44 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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