| Point Forecast: Arlington Heights IL 42.09N 87.98W |
Last Update: 1:56 am CDT May 18, 2025 |
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| Date | 05/18 | 05/19 | ||||||||||||||||||||||
| Hour (CDT) | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 |
| Temperature (°F) | 54 | 53 | 53 | 53 | 54 | 56 | 58 | 60 | 60 | 60 | 60 | 60 | 60 | 59 | 57 | 55 | 52 | 50 | 49 | 47 | 46 | 45 | 44 | 43 |
| Dewpoint (°F) | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 44 | 43 | 43 | 42 | 41 | 40 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 38 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 8 | 9 | 9 | 10 | 10 | 11 | 11 | 11 | 13 | 13 | 13 | 13 | 13 | 11 |
| Wind Dir | NW | NW | NW | NW | NNW | NNW | NNW | N | N | NNE | NE | NE | NE | ENE | ENE | NE | NE | ENE | ENE | ENE | ENE | NE | NE | NE |
| Gust | 14 | 15 | 16 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | ||||||||||||
| Sky Cover (%) | 52 | 52 | 50 | 48 | 46 | 47 | 49 | 50 | 53 | 57 | 60 | 56 | 52 | 48 | 46 | 45 | 43 | 36 | 28 | 21 | 25 | 30 | 34 | 40 |
| 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 (%) | 69 | 71 | 71 | 71 | 69 | 64 | 62 | 58 | 58 | 58 | 55 | 53 | 53 | 53 | 55 | 57 | 61 | 66 | 68 | 74 | 76 | 76 | 79 | 82 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 05/20 | |||||||||||||||||||||||
| Hour (CDT) | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 |
| Temperature (°F) | 43 | 43 | 43 | 43 | 44 | 45 | 47 | 49 | 51 | 53 | 55 | 56 | 57 | 57 | 56 | 55 | 55 | 54 | 53 | 53 | 53 | 53 | 53 | 53 |
| Dewpoint (°F) | 37 | 37 | 37 | 38 | 38 | 38 | 39 | 39 | 39 | 40 | 40 | 41 | 42 | 42 | 41 | 40 | 39 | 39 | 40 | 42 | 43 | 42 | 41 | 41 |
| Heat Index (°F) | ||||||||||||||||||||||||
| Surface Wind (mph) | 10 | 10 | 10 | 11 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 16 | 16 | 17 | 18 |
| Wind Dir | NE | NE | NE | NE | NE | NE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | ENE | NE | NE | NE | ENE | ENE | ENE | ENE | E | E | E |
| Gust | 17 | 17 | 17 | 17 | 18 | 20 | 20 | 21 | 22 | 22 | 23 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 25 | 26 |
| Sky Cover (%) | 45 | 51 | 58 | 64 | 71 | 71 | 72 | 73 | 72 | 72 | 72 | 69 | 67 | 64 | 63 | 62 | 61 | 67 | 74 | 80 | 82 | 83 | 85 | 88 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 8 | 8 | 8 | 8 | 8 | 8 | 15 | 15 | 15 | 15 | 15 | 15 | 22 | 22 | 22 | 22 | 22 | 22 | 57 | 57 |
| Relative Humidity (%) | 79 | 79 | 79 | 82 | 79 | 76 | 74 | 68 | 63 | 61 | 57 | 57 | 57 | 57 | 57 | 57 | 55 | 57 | 61 | 66 | 69 | 66 | 64 | 64 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | SChc | Lkly | Lkly |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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