The climate of Eritrea is tropical desert on the coast and the eastern plain (zone 1 on the map), mild and semiarid in the mountainous belt (zone 2 on the map), and tropical and semi-arid in the south-west (zone 3). From June to September, the country is influenced by the southwest monsoon coming from Ethiopia, which brings a bit of rain, especially in the central and southern inland part.

Along the coast of the Red Sea, (zone 1 on the map), the climate is desert and hot all year round.
In Massawa, winter, from December to March, is hot and sunny: daytime temperatures are around 30 °C (86 °F). Summer, from May to September is oppressive, with daytime temperatures about 40 °C (104 °F), but with peaks of 45 °C (113 °F), and the humidity of the sea that aggravates the feeling of heat. Here are the average temperatures.
Average temperatures - Massawa

Massawa	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Massawa	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	20	21	22	24	25	27	29	28	27	25	22	21
Max (°C)	29	29	32	34	37	40	41	40	39	36	33	31
Min (°F)	68	70	72	75	77	81	84	82	81	77	72	70
Max (°F)	84	84	90	93	99	104	106	104	102	97	91	88

From October to April, there can be some rain, usually not abundant, but the amount of sunshine is good. In summer, some cloud banks can pass, and rare rains occur as part of the southwest monsoon. On average, only 180 millimetres (7 inches) of rain per year fall. Here is the average precipitation.
Average precipitation - Massawa

Massawa	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Massawa	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	33	25	8	8	4	0	9	11	4	16	33	33	184
Prec.(in)	1.3	1	0.3	0.3	0.2	0	0.4	0.4	0.2	0.6	1.3	1.3	7.2
Days	5	4	3	1	1	0	1	1	0	2	3	4	25

On the coast the sun shines all year round, however, in summer some cloud banks can pass as well.
Sunshine - Massawa

Massawa	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Massawa	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	8	7	8	9	10	9	8	9	9	9	10	8

In the southern part of coast, in Assab (or Aseb) the climate is similar, but it's even more arid: in an average year, just 60 mm (2.4 in) of rain fall.
In the Dahlak Archipelago, the summer temperatures are a bit lower than on the coast, but the higher humidity makes the heat unbearable.
The sea in Eritrea is warm all year round, and in summer the Red Sea becomes one of the warmest seas in the world, as you can see in the following table.
Sea temperature - Assab

Assab	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Assab	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	25	26	27	28	30	31	31	31	32	31	28	26
Sea (°F)	77	79	81	82	86	88	88	88	90	88	82	79

In the central inland area, we find the Danakil Depression, where there are salt lakes and salt mines; here the weather is scorchingly hot all year round, with temperatures around 40 °C (104 °F) even in winter.



In the mountainous belt that runs from north to south (zone 2 on the map), the climate is mild due to the altitude, and is also moderately rainy, at least in the centre-south, while the northern part is desert. The highest peak, Emba Soira, reaches 3,000 metres (9,800 ft) of altitude and is located in the south.
In the capital Asmara (or Asmera), the climate is pleasant, being located at 2,300 metres (7,500 ft) above sea level. Daytime temperatures are around 22/23 °C (72/73 °F) in winter, a little higher from March to June, and then they drop a bit in July and August, which are the only really rainy months. Night temperatures are cool in summer, and very cool or even cold in winter. Here are the average temperatures.
Average temperatures - Asmara

Asmara	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Asmara	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	6	7	9	10	11	11	11	11	9	9	8	6
Max (°C)	23	24	25	25	25	25	22	22	23	22	22	22
Min (°F)	43	45	48	50	52	52	52	52	48	48	46	43
Max (°F)	73	75	77	77	77	77	72	72	73	72	72	72

Throughout the year, about 500 mm (20 in) of rain fall; the rains are almost entirely absent from October to March, a few short showers occur from April to June and again in September, July and August, which as mentioned are the two very rainy months. Here is the average precipitation.
Average precipitation - Asmara

Asmara	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Asmara	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	3	3	15	30	40	40	175	150	25	15	20	6	522
Prec.(in)	0.1	0.1	0.6	1.2	1.6	1.6	6.9	5.9	1	0.6	0.8	0.2	20.6
Days	2	2	3	5	7	6	7	8	5	3	3	3	54

The sunshine amount is great from October to February, good in spring, and low in July and August, when the sky is often cloudy. All in all, in Asmara, the climate is good from October to May, and probably the best months are October and November.
Sunshine - Asmara

Asmara	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Asmara	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	10	10	9	8	8	6	4	4	6	10	10	10

Some mountainous areas located north-east of Asmara receive more rain, therefore are greener: here even forests are found.

In the western part of Eritrea (zone 3 on the map), the climate is desert in the north, and semi-desert or semi-arid in the south, where a bit of rain from June to September occur, related to the summer monsoon.
In Agordat (or Ak'ordat), located at 600 metres (2,000 feet) above sea level, 260 mm (10.2 in) of rain per year fall, concentrated from June to September. Here is the average precipitation.
Average precipitation - Agordat

Agordat	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Agordat	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	1	1	0	4	9	25	80	95	35	6	3	1	260
Prec.(in)	0	0	0	0.2	0.4	1	3.1	3.7	1.4	0.2	0.1	0	10.2
Days	1	1	1	1	3	4	6	7	4	2	1	1	32

In Agordat the sun shines regularly in the long dry season, while here too the sunshine hours decrease in summer, though less than in Asmara.
Sunshine - Agordat

Agordat	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Agordat	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	9	10	10	10	10	9	7	8	9	10	10	9

The temperature is high in winter, with more than 30 °C (86 °F) even in January, but nights are quite cool; the temperature becomes torrid in spring, touching 40 °C (104 °F) in May, while it decreases with the arrival of the monsoon, but at the cost of an increase in humidity. Between mid-September and November, the hot weather returns, with highs about 35/37 °C (95/99 °F), although a little less intense than in spring. Here are the average temperatures.
Average temperatures - Agordat

Agordat	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Agordat	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	14	13	14	18	22	22	20	21	20	21	19	16
Max (°C)	31	33	35	39	40	37	32	31	35	37	35	33
Min (°F)	57	55	57	64	72	72	68	70	68	70	66	61
Max (°F)	88	91	95	102	104	99	90	88	95	99	95	91

In the south-west, the landscape is still arid, but the summer rains are more abundant, so much so that precipitation exceeds 600 mm (23.5 in) per year, allowing the survival of a greater amount of shrubs and trees.


The best time to visit Eritrea runs from December to February, because it is the least hot and the driest. It must be said that in some regions it is still a torrid period, particularly in the Danakil, but also in the entire western part at low altitudes, where, however, the heat is more bearable and nights are cool, especially in December and January (in February the temperature already starts to increase a little).


In winter: in Massawa, the Dahlak Islands and the northern coast: light clothing, a light sweatshirt for the evening, possibly a light raincoat or umbrella; for the reef, equipment for snorkeling, water shoes or rubber soled shoes. In Danakil, loose fitting, light-coloured clothing, light and long shirt and pants of natural fibres (cotton, linen), desert turban, hiking shoes. In Asmara and the highlands, spring/autumn clothes, jacket and sweater for the evening, sun hat, sunscreen. In the western inland areas, light clothes, desert turban, sweatshirt and light jacket for the evening.

In summer: on the coast, tropics-friendly, lightweight clothes; for the reef, equipment for snorkeling, water shoes or rubber soled shoes. In Danakil, loose fitting, light-coloured clothing, light and long shirt and pants of natural fibres (cotton, linen), desert turban, hiking shoes. In Asmara and the highlands, spring/autumn clothes, light jacket and sweater for the evening, raincoat or umbrella. For the western inland areas, light clothes, light raincoat.