Map from Google - Honduras

In most of Honduras, the climate is tropical, with a dry season in winter and a rainy season in summer, while in the north there is an area with an equatorial climate, ie rainy throughout the year. In fact, the north-east trade winds that blow in the winter months, are able to pick up moisture from the sea, and then unload showers on the north coast and the northern side of the mountains. As regards the temperature, they are high all year round in the plains, while in mountainous areas they becomes milder or cooler depending on altitude.

In the north, the Caribbean Sea coast, directly exposed to the trade winds, is very rainy throughout the year, with a total of 2,800/3,000 millimetres (110/118 inches) per year. The rest of the country (mostly hilly and mountainous, with a small outlet on the Pacific coast, in the Gulf of Fonseca) is less rainy: rainfall ranges from 900 to 2,000 mm (35 to 79 in) per annum, and experiences a dry season from November to April, called el verano, and a rainy season from May to October, called el invierno (which, despite its name, "the winter", is a warm and sultry period). The difference in climate between the two sides is also reflected in vegetation: the interior and the southern side are dominated by the savanna, while the northern side is covered by the rainforest.
The prevalence of the northeast trade winds, constant winds typical of the tropics, makes the Pacific side warmer and drier especially in the dry winter season, because the air heats up as it comes down from the mountains, while the northern coasts and slopes that receive the winds from the sea, are less hot but more humid. In fact, the average daily temperature reaches 86 degrees Fahrenheit (30 degrees Celsius) in the hottest months (March and April) in the southern plains, while it does not go beyond 28 °C (82 °F) in the northern plains (in the period from May to June, which here is the hottest), but in December and January the difference is even greater: on the south coast the average is around 28 °C (82 °F), while on the Caribbean coast it's around 23/24 °C (73/75 °F).
Even though the Caribbean coast, (as well as the Caribbean Islands, such as Guanaja, Roatán, Útila) has no real dry season, in general there is a decrease in precipitation in the period from February to April, especially in March and April, more marked on the eastern part (Gracias a Dios Department), where it drops to 50/60 mm (2/2.3 in) per month. On the western part, the decrease in precipitation is less noticeable: in Tela and La Ceiba, precipitation does not go below 80/90 mm (3.1/3.5 in) per month.
Here is the average precipitation in La Ceiba.
Average precipitation - La Ceiba
La CeibaJanFebMarAprMayJunJulAugSepOctNovDecYear
La CeibaJFMAMJJASONDY
Prec. (mm)27523016085851401451601953504203702625
Prec.(in)10.89.16.33.33.35.55.76.37.713.816.514.6103.3
Days161186916192018201917179

In this northern part, the rainfall records are high throughout the year, which means that sometimes it can rain a lot even in the months which are normally less rainy, although normally the rainiest period is from October to December in the western part (in Tela, 400 mm (16 in) per month fall in this period), while it goes from June to July in the eastern part (in Puerto Lempira, in these two months the rainfall exceeds 400 mm (16 in) per month). In May, the rains increase in frequency in the western part, and also in intensity in the central-eastern part.
Here are the average temperatures of La Ceiba.
Average temperatures - La Ceiba
La CeibaJanFebMarAprMayJunJulAugSepOctNovDec
La CeibaJFMAMJJASOND
Min (°C)191920212223222222212019
Max (°C)272729303131313131292827
Min (°F)666668707273727272706866
Max (°F)818184868888888888848281

For swimming, the sea is warm enough all year round: the water temperature varies between 27 °C and 29 °C (81 and 84 °F).
Sea temperature - Roatan
RoatanJanFebMarAprMayJunJulAugSepOctNovDec
RoatanJFMAMJJASOND
Sea (°C)272727282829292929292827
Sea (°F)818181828284848484848281

On the southern slope and in inland areas, where the rainy season lasts from May to October, there is some decrease in rainfall in July and August, so the rainiest periods are May-June and September-October.
The Honduran capital Tegucigalpa is located in the tierras templadas, at 1,000 metres (3,300 feet) above sea level, and its climate is certainly more pleasant than at sea level: the normal daytime temperature ranges from 25 °C (77 °F) in December, to 30 °C (86 °F) in April and May. Really hot days are rare, except in March and April, when the temperature can touch 35 °C (95 °F). Here are the average temperatures.
Average temperatures - Tegucigalpa
TegucigalpaJanFebMarAprMayJunJulAugSepOctNovDec
TegucigalpaJFMAMJJASOND
Min (°C)141516171818181818181615
Max (°C)262730303029282929272625
Min (°F)575961636464646464646159
Max (°F)798186868684828484817977

The rainfall amounts to 870 mm (34 in) per year, of which more than 120 mm (4.7 in) in the four rainiest months (which, as we have said, in this area are May-June and September-October). From November to mid-April, it rains very rarely.
Here is the average precipitation.
Average precipitation - Tegucigalpa
TegucigalpaJanFebMarAprMayJunJulAugSepOctNovDecYear
TegucigalpaJFMAMJJASONDY
Prec. (mm)55104514516080901751104010870
Prec.(in)0.20.20.41.85.76.33.13.56.94.31.60.434.3
Days11129129913104273

Tegucigalpa

The Mayan archaeological site of Copán lies at 700 metres (2,300 feet) above sea level, so it is a bit warmer than the capital; here the maximum temperature ranges from 26 °C (79 °F) in December, to 31 °C (88 °F) in April.
Above 2,000 metres (6,500 feet), night temperatures can be cold, especially in the period from November to March, while above 2,500 metres (8,200 ft), it can get cold even during the day.

Sometimes from December to March, Honduras can be reached by cool air masses from the United States, and in these cases at night the temperature can drop to around 10 °C (50 °F) in Tegucigalpa, and around 13/15 °C (55/59 °F) in the plains.

Although the tropical rains occur mainly as heavy showers, the amount of sunshine in the rainiest months is not so high, with around 6 hours of sunshine per day, while from February to April there are about 7-8 hours of sunshine per day.

Honduras is located in the path of hurricanes, which may hit the country in the period from June to November, coming from the east. However, the period in which they are most likely runs from August to October.

When to go

The best time to visit Honduras runs from December to mid-April on the southern side, in Tegucigalpa and in the interior, while in the northern coast, and in the small Caribbean islands belonging to Honduras (the largest of which is Roatán), it only corresponds to the period from February and April.

What to pack

In Tegucigalpa and the tierras templadas: all year round, light clothing, a sweatshirt or sweater, a jacket for the evening from November to March; raincoat or umbrella from May to October.
On plains and coasts: lightweight clothes, a sweater for the evening from December to March; from May to October, tropics-friendly clothing, plus a light sweatshirt and a light raincoat for thunderstorms. For the reef, equipment for snorkeling, water shoes or rubber soled shoes.
On high mountains: warm clothes, jacket, hiking boots.