The Tropic of Cancer runs straight through the middle of Taiwan bringing with it tropical and subtropical weather. Taiwan experiences weather similar to Yunnan, Guangxi and Guangdong provinces. It typically presents an average temperature of 22C (71.6F) all year round. There is no severe cold in winter and no brutal summer heat. Taiwan always welcomes you with its pleasant seasons.

From April to November is summer in Taiwan. The hottest month is July with an average temperature of 28C (82.4F). December through to March brings the coolest temperatures with an average temperature of 15C (59F) to 18C (64.4F). Of course, the presence of snow is unheard of, though weather patterns show an increase in rainy days. A sweater and a jacket are all the preparation required for a winter in Taiwan. Spring and autumn are peak seasons for travelers.

Taiwan is a humid region. The northern part, middle mountain area and western plain are abundant with rainfalls in different periods. June to October is the typhoon season in Taiwan, with July to September offering the most activities to experience.

Detailed information about the Average, Maximun and Minimum Temperatures and the rainfall in Taipei.

Average Data	Jan	Feb	Mar	Apr	May	June
Average High (F)	60/62	60/62	62/68	72/75	77/80	79/82
Average High (C)	16/17	16/17	17/20	22/24	25/27	26/28
Average Low (F)	52/59	54/59	57/60	64/68	70/73	73/77
Average Low (C)	11/15	12/15	14/16	18/20	21/23	23/25
Rain (in)	3.3/4.1	5.1/6.2	6.6/7.4	6.6/7.8	7.8/8.6	10.6/11.8
Rain (mm)	85/105	130/160	170/190	170/200	200/220	270/300

Average Data	July	Aug	Sep	Oct	Nov	Dec
Average High (F)	82/84	86/89	84/86	77/80	68/73	62/66
Average High (C)	28/29	30/31	29/30	25/27	20/23	17/19
Average Low (F)	77/80	80/84	79/82	73/75	62/66	54/57
Average Low (C)	25/27	27/29	26/28	23/24	17/19	12/14
Rain (in)	8.6/9.8	8.2/10.6	6.6/9.4	4.7/5.5	2.7/3.5	2.9/3.1
Rain (mm)	220/250	210/270	170/240	120/140	70/90	75/80

Detailed information about Tainan

Average Data	Jan	Feb	Mar	Apr	May	June
Rain (in)	0.6/0.7	0.9/1.0	1.5/1.6	3.0/3.1	7.9/8.0	17.4/17.5
Rain (mm)	15/20	20/25	35/40	75/80	200/205	440/445

Average Data	July	Aug	Sep	Oct	Nov	Dec
Rain (in)	15.9/16.0	14.0/14.1	8.1/8.2	0.8/0.9	0.7/0.8	0.9/1.0
Rain (mm)	405/410	355/360	205/210	20/25	15/20	20/25

Taken from travelchinaguide.com/climate/taipei.htm