Weather
An Hour-to-Hour Look at the Rising Temps in Crystal Lake, Cary
The extreme heat will start Thursday with temps expected to climb Friday and Saturday.
CRYSTAL LAKE, IL — It's going to be hot, hot, hot in Crystal Lake and Cary in the coming days and across the Chicago area. Officials are reminding residents, as the heat starts to set in, to stay safe, hydrated and in the comfort of their air-conditioned homes, offices or elsewhere. The hottest conditions are expected Friday and Saturday across the region with the temps steadily expected to climb starting today (Thursday, July 18).
High temps will reach between 90 and 100 degrees in the Chicago area. A head advisory has been issued for McHenry County with the heat index expected to reach between 100 and 110 degrees.
We've provided a glimpse below of the hour-by-hour forecast of temps, heat index, relative humidity and precipitation in Crystal Lake for the coming days:
Find out what's happening in Crystal Lake-Caryfor free with the latest updates from Patch.
| Thursday, July 18 | Temperature | Heat Index | Relative Humidity | Precipitation Potential |
| 11 a.m. | 79 degrees | 79 degrees | 69 percent | 79 percent |
| 3 p.m. | 90 degrees | 97 degrees | 56 percent | 31 percent |
| 6 p.m. | 91 degrees | 103 degrees | 62 percent | 12 percent |
| 8 p.m. | 87 degrees | 99 degrees | 72 percent | 9 percent |
| Friday, July 19 | ||||
| 4 a.m. | 78 degrees | 78 degrees | 88 percent | 16 percent |
| 8 a.m. | 80 degrees | 84 degrees | 82 percent | 8 percent |
| 10 a.m. | 87 degrees | 98 degrees | 70 percent | 10 percent |
| 12 p.m. | 91 degrees | 105 degrees | 64 percent | 10 percent |
| 2 p.m. | 94 degrees | 109 degrees | 58 percent | 9 percent |
| 4 p.m. | 95 degrees | 109 degrees | 54 percent | 9 percent |
| 8 p.m. | 89 degrees | 99 degrees | 64 percent | 18 percent |
| Saturday, July 20 | ||||
| 12 a.m. | 82 degrees | 88 degrees | 77 percent | 18 percent |
| 4 a.m. | 79 degrees | 79 degrees | 82 percent | 25 percent |
| 8 a.m. | 81 degrees | 86 degrees | 77 percent | 14 percent |
| 12 p.m. | 92 degrees | 101 degrees | 55 percent | 14 percent |
| 4 p.m. | 91 degrees | 99 degrees | 69 percent | 40 percent |
| 8 p.m. | 81 degrees | 85 degrees | 69 percent | 40 percent |
Cooling Shelters
McHenry County Emergency Management is working to keep an updated list of cooling centers up on its website for those wanting to get some reprieve from the heat.
More on Patch
Find out what's happening in Crystal Lake-Caryfor free with the latest updates from Patch.
Get more local news delivered straight to your inbox. Sign up for free Patch newsletters and alerts.