Actually, all that sweating just comes from overheating and not from burning calories. It is not recommended to excercise in the heat because you risk dehydration. Also your blood pressure could drop rapidly and that is really bad.
If it is hot you better go to the pool and swim.
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Unless you are exercising under extreme heat that may give you sunburn or heatstroke, exercising outdoor will bring you more benefits than doing the same sport indoor.

1. Yes, jogging or walking outdoor will burn up to 30% more calories than doing the same sport indoor.

For more infor, goto:
http://www.independent.co.uk/life-style/health-and-families/healthy-living/outdoor-exercise-lets-go-787259.html

2. Natural sunlight is vital to our health. It will help us to produce more Vitamin D.
For more infor, goto:
http://www.metaboliceffect.com/me_pages/benefitoutdoor.html
Beneficial Effects of Sunlight

3. Walking or jogging on natural surface will help to strengthen your joints and small muscle more than doing it on a smooth surface (a normal treadmill)

4. Going outdoor will give us a chance to be connected to the trees or flowers rather than staying indoor with the ice-cold steel or plastic gym equipments. It will not only improve your physical health but also your mental/emotional health

5. Go Green when you exercise
If you do have a choice, try not to choose a sport that will consume more power (air-conditioning, gym machines) than those which consume less.

Do remember to put on sunscreen if you are going to exercise outdoor between 10am to 4pm even it is on a cloudy day. Also, choose a safe neighbourhood you are familiar with if you are going to jog outdoor

Meanwhile, enjoy Here comes the Sun by The Beatles:
http://www.youtube.com/watch?v=hsv34Ng_Rik
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Living in mexico I can tell you that you do burn more calories, however like others said you need to replace your fluids MORE since you are loosing so much water and salt.
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In addition to points made by seantang, your body also releases toxins through sweating, so more sweating outdoors could also help 'cleanse' your system more along with the moderate exercise.
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no...but you will definately be in bed for a longer time....
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Yes you burn a lot more calories by excercising outside.
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Yes, you will burn more caloriesexercising outdoors in hot weather, however, it adds more stress to the heart and increase your chance of heat stroke/exhaustion. Remember to keep properly hydrated with water and possibly sports drinks to replenish calcium and potassium to ward off leg cramps and other problems. Exercising outdoors in hot weather should be done in moderation or by trained athletes.
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Depending on the trail/pavement you pick, yes you will burn more calories. The trick is to keep properly hydrated though so pack water or gatorade.
Source(s):
http://findarticles.com/p/articles/mi_m0846/is_6_21/ai_81825794/

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no you will cause yourself to get very overheated. It is best to excerise in the coolness of the mornings or evenings. the key to exerise and losing weight is to be consitant. If you are going to do 3 days a week then do them no matter what.
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