Guinea pigs feel the cold just like we do! So if you feel cold outside, so will your piggie. The best temperature is between 18-24 celcius for a guinea pig comfort.
There are 3 things you can do in the cold weather.
1, bring them inside,
2, put their hut in a shed or outbuilding
3, cover the hut in insulation and waterproof cover
The most important thing is to keep the hut or run dry. Damp along with cold can make a piggie ill, so protection from the elements is vital. If outside, you can use a piece of carpet, blanket or cardboard for insulation over the hut along with a waterproof cover, like a store brought one or a piece of tarpaulin to keep the rain out. Make sure you leave ventilation though, to keep the air circulating inside the run. If in a shed or outbuilding, placing a blanket between the wall and hut keeps warmth in as well. Indoors, keep guinea pigs away from draughts or windows. Also make sure their run is off the floor as that gets extra cold!
Buy, make or borrow anything extra for your guinea pigs to get cosy in:)
Pigloos, tunnels, huts and cardboard boxes stuffed with hay ,shredded paper or fleece so they can snuggle in. You can buy the safe heat pads for small animals , they are really good and get just warm in the microwave so pigs can lie on them for extra heat. Or get them a friend or 2 to cuddle with:) You can even use old jumpers and tee-shirts etc for bedding. Make sure all bedding is dry, checked and changed regularly for damp. Hay can get damp too so that will need changing more often in winter. If they are inside, make sure they are not right next to the radiator, or turn it down as they can also get too hot that way!
Giving your guinea pig extra food in the winter helps to keep their body temperature and energy levels up. Lots of fresh hay, nuggets/pellets and veggies all help with general health. Keep a cover on water bottles if outside as the water can freeze, you can also use a sock or bubble wrap to protect the bottles.
Whether your guinea pig is indoors or out, they need lots of cuddles and playtime. This is important any time of year, but I say this as if your piggies are kept outside, they can easily be forgotten in the cold, wet , dark days of winter when you are snuggled up indoors. Just think of your loved friends out in the cold, bring them in extra and for longer times for company and warmth..They will appreciate this and be your best friend, running around making you smile when they happily popcorn:):):)