Do you need to know, when is the best time to go to Australia? Then you should take a look here, what weather you can expect there during the year.
The climate of Australia varies widely, as the country is very large. The largest part of Australia is arid to semiarid, temperate in south and east, tropical in north. The northern part of Australia has a tropical climate with tropical rainforests, grasslands and deserts. Winter in Australia is usually mild, there are not so huge contrasts between summer and winter temperatures as on the northern hemisphere. But on some places the temperatures can go down below zero in winter.
As Australia has a really huge area, the information below relate mostly only to the area around the capital of this country. To see information about other places, please, choose one of these areas: New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Victoria, Western Australia.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is January, the average maximum temperature is 28.3 ℃ (82.94 ℉). The average minimum temperature in this month is 12.9 ℃ (55.22 ℉). The coldest month here is July, the average maximum temperature is 11.2 ℃ (52.16 ℉). The average minimum temperature in this month is 0 ℃ (32 ℉). The most rainy month here is August, the average number of rainy days is 10.9. The least rainy month here is February, the average number of rainy days is 6.6. 
When travelling to some places in Australia, always consider the altitude of the the place as well. The highest point here is Mount Kosciuszko (2228 m) and the lowest point is Lake Eyre (-15 m). So there are quite big differences in altitudes in this country, so you can expect the weather to be different in different altitudes as well. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Australia in January is this: The average highest temperature in Australia in January is 28.3 ℃ (82.94 ℉). The average lowest temperature is 12.9 ℃ (55.22 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 27.15 ℃ (80.87 ℉). At the end of January you can expect lower temperatures, the average highest temperature is around 27.6 ℃ (81.68 ℉). The average number of rainy days in January is 7.7. The average rainfall is 60.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:29 (hours and minutes), in the middle of the month 14:15 and at the end of the month 13:52.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Australia in February is this: The average highest temperature in Australia in February is 26.9 ℃ (80.42 ℉). The average lowest temperature is 12.8 ℃ (55.04 ℉). At the beginning of February you can expect higher temperatures, the average highest temperature is around 27.6 ℃ (81.68 ℉). At the end of February you can expect lower temperatures, the average highest temperature is around 26 ℃ (78.8 ℉). The average number of rainy days in February is 6.6. The average rainfall is 54.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:52 (hours and minutes), in the middle of the month 13:23 and at the end of the month 12:51.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in March is this: The average highest temperature in Australia in March is 25.1 ℃ (77.18 ℉). The average lowest temperature is 10.9 ℃ (51.62 ℉). At the beginning of March you can expect higher temperatures, the average highest temperature is around 26 ℃ (78.8 ℉). At the end of March you can expect lower temperatures, the average highest temperature is around 22.4 ℃ (72.32 ℉). The average number of rainy days in March is 7.3. The average rainfall is 52 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:51 (hours and minutes), in the middle of the month 12:17 and at the end of the month 11:44.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Australia in April is this: The average highest temperature in Australia in April is 19.7 ℃ (67.46 ℉). The average lowest temperature is 6.7 ℃ (44.06 ℉). At the beginning of April you can expect higher temperatures, the average highest temperature is around 22.4 ℃ (72.32 ℉). At the end of April you can expect lower temperatures, the average highest temperature is around 17.65 ℃ (63.77 ℉). The average number of rainy days in April is 7.4. The average rainfall is 48.7 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:44 (hours and minutes), in the middle of the month 11:11 and at the end of the month 10:42.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in May is this: The average highest temperature in Australia in May is 15.6 ℃ (60.08 ℉). The average lowest temperature is 3.3 ℃ (37.94 ℉). At the beginning of May you can expect higher temperatures, the average highest temperature is around 17.65 ℃ (63.77 ℉). At the end of May you can expect lower temperatures, the average highest temperature is around 14.05 ℃ (57.29 ℉). The average number of rainy days in May is 8.3. The average rainfall is 47.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:42 (hours and minutes), in the middle of the month 10:16 and at the end of the month 9:57.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Australia in June is this: The average highest temperature in Australia in June is 12.5 ℃ (54.5 ℉). The average lowest temperature is 1.1 ℃ (33.98 ℉). At the beginning of June you can expect higher temperatures, the average highest temperature is around 14.05 ℃ (57.29 ℉). At the end of June you can expect lower temperatures, the average highest temperature is around 11.85 ℃ (53.33 ℉). The average number of rainy days in June is 9.3. The average rainfall is 38.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:57 (hours and minutes), in the middle of the month 9:47 and at the end of the month 9:47.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in July is this: The average highest temperature in Australia in July is 11.2 ℃ (52.16 ℉). The average lowest temperature is 0 ℃ (32 ℉). At the beginning of July you can expect higher temperatures, the average highest temperature is around 11.85 ℃ (53.33 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 12.2 ℃ (53.96 ℉). The average number of rainy days in July is 9.8. The average rainfall is 41.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:47 (hours and minutes), in the middle of the month 9:58 and at the end of the month 10:17.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in August is this: The average highest temperature in Australia in August is 13.2 ℃ (55.76 ℉). The average lowest temperature is 1.2 ℃ (34.16 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 12.2 ℃ (53.96 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 14.7 ℃ (58.46 ℉). The average number of rainy days in August is 10.9. The average rainfall is 47.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:17 (hours and minutes), in the middle of the month 10:43 and at the end of the month 11:12.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in September is this: The average highest temperature in Australia in September is 16.2 ℃ (61.16 ℉). The average lowest temperature is 3.2 ℃ (37.76 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 14.7 ℃ (58.46 ℉). At the end of September you can expect higher temperatures, the average highest temperature is around 17.75 ℃ (63.95 ℉). The average number of rainy days in September is 10. The average rainfall is 51.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:12 (hours and minutes), in the middle of the month 11:44 and at the end of the month 12:17.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in October is this: The average highest temperature in Australia in October is 19.3 ℃ (66.74 ℉). The average lowest temperature is 6.1 ℃ (42.98 ℉). At the beginning of October you can expect lower temperatures, the average highest temperature is around 17.75 ℃ (63.95 ℉). At the end of October you can expect higher temperatures, the average highest temperature is around 20.85 ℃ (69.53 ℉). The average number of rainy days in October is 10.7. The average rainfall is 63.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:17 (hours and minutes), in the middle of the month 12:50 and at the end of the month 13:22.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in November is this: The average highest temperature in Australia in November is 22.4 ℃ (72.32 ℉). The average lowest temperature is 8.9 ℃ (48.02 ℉). At the beginning of November you can expect lower temperatures, the average highest temperature is around 20.85 ℃ (69.53 ℉). At the end of November you can expect higher temperatures, the average highest temperature is around 24.2 ℃ (75.56 ℉). The average number of rainy days in November is 9.7. The average rainfall is 64.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:22 (hours and minutes), in the middle of the month 13:51 and at the end of the month 14:15.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Australia in December is this: The average highest temperature in Australia in December is 26 ℃ (78.8 ℉). The average lowest temperature is 11.3 ℃ (52.34 ℉). At the beginning of December you can expect lower temperatures, the average highest temperature is around 24.2 ℃ (75.56 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 27.15 ℃ (80.87 ℉). The average number of rainy days in December is 7.7. The average rainfall is 51.9 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:15 (hours and minutes), in the middle of the month 14:29 and at the end of the month 14:31.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.