Definite cool down mid week next week. We'll have to wait to be more specific on the timing of any precip until we get a little closer. There are other model solutions besides the GFS that I'm displaying here, and they differ on strength and timing.
Here's an excerpt from the Omaha NWS office:
"LONG TERM...(SATURDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 245 AM CDT THU SEP 3 2015
UPPER PATTERN CONTINUES TO TRANSITION DURING THE PERIOD WITH LESS AMPLIFIED FLOW DEVELOPING AS NORTHERN STREAM DROPS INTO THE NORTH HALF OF THE NATION AND UPPER HIGH CENTER IS FORCED SOUTH. A COLD FRONT IS INDICATED TO MOVE INTO THE REGION ON SUNDAY BY BOTH THE GFS AND EURO WITH CHANCE OF STORMS SATURDAY NIGHT INTO SUNDAY NIGHT. FRONT STALLS TO THE SOUTH ON MONDAY. OVERRUNNING 850MB FLOW WILL BRING A CONTINUED CHANCE OF PRECIP FOR MONDAY NIGHT WITH A SECOND FRONT COMING IN ON TUESDAY...ALTHOUGH MODEL SOLUTIONS DIFFER ON TIMING AND STRENGTH OF BOTH UPPER LEVEL AND SURFACE FEATURES. BROAD BRUSH POPS FOR THIS LATE PART OF THE PERIOD DUE TO UNCERTAINTY BETWEEN MODEL SOLUTIONS. TEMPERATURES COOL TO MORE SEASONAL LEVELS DURING THIS TIME."
Note: My "official" Lincoln page: http://www.daculaweather.com/4_track_lincoln.php
Please keep in mind... the images I'm using here are all from the 12Z GFS model run on Thursday, September 3rd. These are not a forecast, but simply what the GFS model "thinks" will happen. The official forecast (at the moment) is at the bottom of this post and on my linked page above.
8 AM Temperatures
2 PM Temperatures
2 PM Precipitation
General Purpose Meteogram
Maximum Temperature Meteogram
Minimum Temperature Meteogram
Forecast issued at 1:35 CDT, September 3rd