Rain

There are a few things you can do for your camera if you happen to be stuck outside with holding it, and weather really becomes a factor. If the weather turns to rain, you can put your camera under your jacket, shirt, hat, anything that will shield it. If you’re interested in getting some pictures of the weather, you can put your camera in a plastic bag and make a hole big enough for the lens. Just use a rubber band to secure the bag to the lens.

Get a good camera bag

One thing you can do to protect your camera while traveling or hiking or exposed to the elements is to invest in a good, high quality camera bag. There are plenty of them out there and a lot of them are weatherproof.

Heat

Avoid leaving your camera in the extreme heat if you’re outside. Laying a light towel over it will help shade it from the sun. Don’t use dark colors, as they will just absorb the heat.

Cold

When its gets cold out, one thing you can do for your camera is try to keep it as warm as possible. Again, putting it under your jacket works well using, your body heat. Keeping your camera as warm as possible will hopefully prevent condensation from occurring.

Use a UV filter

It's also a good idea to use a filter such as a UV (ultra-violet) or skylight filter to protect your lens. They’re much cheaper to replace then a lens any day of the week.