Measuring only 140km by 80km (area 5620 sq km),the island is dominated by a series of towering volcanos that range its entire width. The tallest is Gunung Agung (over 3000m), which is revered as the holy "Mother temple".
Tropical rainfall, consistant temperatures and the rich volcanic soil provide an ideal environment for intensive agricultural activity including rice,
coffee, copra, and vegetable growing, as well as cattle herding.
Bali is in the Central Indonesia Standard Time zone, and is GMT plus 8 hours.

Climate and weather.
   Bali is located near to the equator, and has a tropical climate, with year-round maximum temperatures typically ranging     from 32 to 35 degrees Celcius, but with high humidity levels. Rain can be expected at any time, even during the dry season, however an overnight shower is generally refreshing, and usually washes away the dust. A cooling breeze that often springs up of an evening makes a brilliant tropical day seem perfect. The central mountainous area is typically cooler than the lower coastal regions, especially overnight.

Our Bali weather chart
 Month Max temp Min temp Rain Humidity Season Best
(Deg. C) (Deg. C) (mm) (%) time
Jan 32 26 350 70 Wet *
Feb 32 26 250 70 Wet *
Mar 32 25 200 65 Wet ***
Apr 34 25 80 60 Dry *****
May 34 24 100 55 Dry *****
Jun 33 22 50 50 Dry *****
Jul 32 22 40 50 Dry *****
Aug 33 23 30 45 Dry *****
Sep 34 23 40 45 Dry ****
Oct 35 24 100 50 Wet ***1/2
Nov 35 25 125 55 Wet ***
Dec 33 26 250 65 Wet **

The star rating is a rough guide to indicate the best times to visit Bali. Take a look at the http://www.usatoday.com/weather/basemaps/nw972300.htm
   Be aware that seasons vary, and that weather effects such as cyclones and storms may occur at any time of the year--there are no guarantees.
Rain may occur even during the dry season, and the humidity is generally high year-round, although it is very high during the hot wet season.
The mountainous central area is usually much cooler (especially overnight) and rarely suffers the extremes of the coastal areas, and offers a refuge for those who find the heat of the lowlands unbearable.

Plants.
   The most holy of trees, the banyan, grows to a massive size, and may have hundreds of creepers hanging from its branches. They grow in many of the lowland rainforests, and are a feature of most temples.
Palm trees line the beaches, yielding fruit such as coconuts as well as sugar, fibre, oil and fuel. In Bali, the coconut palm is said to be the most useful of all trees, providing food, drink, firewood, timber and leaves suitable for making a shelter.
The heady smell of frangipani flowers make up for all of the less favorable odours that are typically experienced in Asian cities, and the shady frangipani trees are grown almost everywhere in Bali.
Bamboo, bananas, hibiscus, bougainvillaea, oleander, jasmine, water-lillies and lotus may be seen growing wild, as well as in plantations and gardens throughout the island.
Rice fields dominate the landscape, especially in the lower foothills south of the central mountains, and provide spectacular and scenic views when seen from the winding mountain roads.

Dogs
  The first animal that is sighted by any visitor to Bali is invariably a dog of the local variety, usually seen carrying out one of its ritual practices of sniffing piles of rubbish, marking its territory or lying down in the centre of the footpath. These generally mangy, scabby and ugly creatures are not treated with affection by anybody in Bali, but seem to live their lives around the streets in bliss despite that.

Other animals.
   Monkeys will be seen in most temples, demanding peanuts, as well as in several of the forests, including the famous tourist spots on the way to Tanah Lot and in Ubud. Other wild animals include bats and lizards (such as the small cream colored cecaks that seem to inhabit most the walls of rooms, and the larger geckos, whose call of "geck-oh" is a familiar part of the evening soundscape). The evening chorus of frogs will also amaze you if you are staying anywhere near lake or waterway.
   Many domestic animals are seen all over the island, including ducks fossicking in the rice fields (a form of natural pest control), buffalo, cows, pigs (babi) and chickens (ayam). Wild pigs may be seen in the less populated areas.
   The birds of Bali are seen mainly outside of the cities and villages. Parrots and other brightly colored birds are not seen too frequently but are impressive sights when spotted. Near to Ubud is the village of Petulu, where each evening, thousands of white herons arrive to perch in the trees that line the main road. Sulphur crested cockatoos and the rare Rothchild's minah are found on the island of Nusa Penida, and the latter may sometimes be seen in the Bali Barat National Park. Of course, those are just some of the animals you will see in Bali. About five miles due north of Denpasar there are two wonderful Zoological parks, ideal opportunities for any visitor with an interest in Bali's fascinating wildlife. Side by side on the main road to Ubud are the Bali Bird Park and the http://www.herpafauna.com
  Bali Reptile Park Both are beautifully set out and perfectly maintained facilities, a delight to the casual nature lover and a valuable resource to any serious zoological enthusiast. The Bird Park offers close-up viewing of a vast array of the remarkable and colorful birds of Indonesia, with signs in English and a very helpful staff. There is a large walk-through aviary where visitors may photograph rare birds in natural surroundings. Visitors to the adjoining Reptile park will see snakes and lizards (including enormous pythons and the famous Komodo Dragon!) displayed in what has been described as "the most beautiful Reptile Park in the world".
   The Reptile Park is also an important research facility, conducting breeding programs for rare and endangered species as well as extraction of venom for international research.
   All local Taxi drivers and public transport systems can take travellers to the Parks. The address is: Jalan Serma Cok Ngurah Gambir, Singapadu Gianyar, Bali.

http://indonesianet.com/travel/trmobali.htm - Money Changers Bali.