I found this on Olympus site
Is the E-M5 weatherproof?
The E-M5 camera body has weatherproof construction. Weatherproof integrity is preserved when using Micro Four Thirds weatherproof lenses or Four Thirds weatherproof lenses (Super High Grade and High Grade lenses) when mounted using the MMF-3 Micro Four Thirds to Four Thirds Adapter.
To ensure weatherproofing the following is essential. Ensure that the Accessory Port cover below the hot shoe is in place when not being used to mount accessories. Additionally, the PBH cover on the base of the camera must be properly secured when the Power Battery Holder HLD-6 is not mounted. When the HLD-6 is mounted, ensure it is correctly aligned when mounted on the camera to preserve weatherproof integrity.
When going from extremes in temperature (for example, moving from an air conditioned environment to a hot environment or vice versa), condensation may form inside the camera. Even though the E-M5 is weatherproof, it still may contain humid air because the camera needs to "breathe" to compensate for changes in internal pressure when lenses are zoomed, particularly long focal length zoom lenses. The condensation will disappear in a few minutes when the temperature of the camera has stabilized in relation to the shooting environment.
So im assuming its nothing too worry about thankfully