Lesotho is a small mountainous country, enclave of South Africa, by which is entirely surrounded. Here the climate varies essentially with altitude: it is temperate at the lowest elevations, which don't go, however, below 1,400 metres (4,600 feet), while it gets colder as you go up in altitude.
In Lesotho, the weather is often unstable, with rapid changes in wind and temperature from day to day. Winter is the driest season, while summer is the rainiest. Being in the Southern Hemisphere, it obviously has reversed seasons in comparison with Europe and North America.
The capital Maseru is located at 1,600 metres (5,250 feet) above sea level, but most of the country is crossed by the Drakensberg range, and lies above 2,000 metres (6,500 feet); the highest peak is Thabana Ntlenyana, with its 3,482 metres (11,424 feet).
In Maseru, the climate is temperate: it's warm in summer, sometimes hot, but with cool nights, and mild in winter but with cold nights. In fact, the temperature range between night and day is generally wide. In summer, from November to March, highs hover around 24/28 °C (75/82 °F), and lows around 12/15 °C (54/59 °F); this is also the rainy season, due to thunderstorms in the afternoon, which don't reduce too much the sunshine duration. In winter, from May to August, lows are slightly above freezing (0 °C or 32 °F), while highs are around 16/19 °C (61/66 °F).
Here are the average temperatures of Maseru.
Average temperatures - Maseru

Maseru	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Maseru	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	15	14	12	8	4	1	1	2	6	9	11	13
Max (°C)	28	27	24	21	18	16	16	19	23	24	26	27
Min (°F)	59	57	54	46	39	34	34	36	43	48	52	55
Max (°F)	82	81	75	70	64	61	61	66	73	75	79	81

Precipitation in Maseru mounts to 660 millimetres (26 inches) per year, including more than 85 mm (3.3 in) from November to March, while in winter precipitation is scarce. Although winter is a dry season, sometimes snow can fall. Here is the average precipitation.
Average precipitation - Maseru

Maseru	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Maseru	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	110	100	90	70	30	15	10	20	25	60	85	90	715
Prec.(in)	4.3	3.9	3.5	2.8	1.2	0.6	0.4	0.8	1	2.4	3.3	3.5	28.1
Days	12	12	11	8	4	2	2	3	4	9	10	11	88

The sun at Maseru shines all year round, as can be seen in the following table.
Sunshine - Maseru

Maseru	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Maseru	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	9	9	8	8	8	8	8	9	9	9	9	10

Snow is more common at high altitudes, above 2,000 metres (6,500 feet), where even rainfall is more abundant.

When to go

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Despite the fact that it is the rainiest season, the austral summer, from November to March, is the best season to visit Lesotho, because in any case it's sunny, and at night it's less cold than the rest of the year. During the day it can get hot at lower altitudes, but nights remain cool: even in Maseru it will be useful to bring a sweater for the evening. In this period, however, some mountain roads may be impassable due to the rains.
You can also go in spring and autumn, especially in April, September and October, when the temperatures are mild, although there are still considerable differences between night and day; the amount of sunshine is good, rainfall is possible but not abundant. Sometimes, however, at night it can freeze even in spring and autumn, and it can snow at high altitudes.

What to pack

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In winter (June to August): in Maseru, spring/autumn clothes, sweater and warm jacket for the evening; above 2,000 metres (6,500 feet), down jacket, gloves, scarf, hat, hiking shoes.

In summer (December-February): in Maseru, light clothes for the day, sweatshirt and jacket for the evening, sun hat, light raincoat or umbrella; for the highest elevations, sweatshirt or sweater, warm jacket, hiking boots.