50s For Now But 70s Fairly Soon
To say Mother's Day will be cool is a huge understatement. Highs will be 15° to nearly 20° below average. It should end up being cooler Sunday that Christmas Day last year when the high hit 57°. Friday's highs failed to get out of the 40s when we should be near 70° for this time of year. So far May is averaging about -3.4° below average.
This cool pattern that kicked in during early April could be coming to an end fairly soon. Longer range forecasts suggest warmer spring weather could arrive as early as the end of this upcoming week.
With the return of warmer weather will come some spring showers and thunderstorms. Plenty of sunshine today but showers return tomorrow and more unsettled weather expected Thursday into Friday.
The 6-10 day temperature probability outlook has us still favored for cooler than average temperatures overall from May 14-18 but we could turn the corner on the cool pattern just beyond that. The 8-14 day outlook includes Chicago in a growing region that is favored for above average temps from May 16-22.
There should be a warm up coming by the end of next week. The GFS model brings 60s back with highs near 70° south of the city. That will seem warm compared to this weekend but it is actually right around average for the middle of May.
The warm up continues into the weekend with highs well into the 70s by Sunday. The GFS model is even showing lower 80s for a large portion of northern Illinois. If we hit 80° next Sunday that would tie as the warmest day of the year so far. If we climb to above 80° it would be the warmest day since early October last year. That means it would be the warmest day we have seen in over seven months!
Here is my 7 day forecast:
Today: Sunny, cool, a bit breezy High: 57
Sunday: On & off showers, blustery & cooler Low: 42 High: 52 (falling into 40s pm)
Monday: Partly to mostly sunny Low: 37 High: 55
Tuesday: Partly to mostly sunny Low: 38 High: 59
Wednesday: Partly to mostly cloudy, sct. showers late Low: 43 High: 63 (54 Lakefront)
Thursday: Mostly cloudy, sct. showers/t-storms Low: 49 High: 68
Friday: Mostly cloudy, sct. showers/t-storms Low: 29 High: 70 (56 Lakefront)