Lincolnshire Police say there has been a spike in burglaries involving criminals getting into Lincoln houses through open doors and windows.
Despite the rain, temperatures are fairly high and officers say they are experiencing the seasonal problem due to insecurities.
Recent examples include a criminal getting into a house in Norris Street in Lincoln, overnight June 26/27 through an open kitchen window. Cash and a gaming console were stolen.
Thieves also got into a house in Newark Road through an unlocked kitchen door at about 12.30pm on June 28. A handbag with cash and cards was taken.
Overnight on June 19/20 offenders also got into a house in Dellfield Avenue through an unlocked front door. Two mobile phones, a gaming console, a laptop and games were stolen.
Officers are urging to lock all doors and downstairs windows overnight and to consider the risk of sneak-in burglaries during the day.