Climate and monthly weather forecast
Trebinje, Bosnia and Herzegovina

Characterizing the climate of Trebinje includes the understanding of its geographical and meteorological elements. Geographically nestled in Bosnia and Herzegovina, Trebinje is classified under the Köppen climate classification as Cfb, indicating a marine west coast climate with a warm summer. Consequently, weather patterns here present a significant shift from warm, dry summer months to colder, rainy winter months.

Year-round temperatures in Trebinje vary between the lowest average of 5.5°C (41.9°F) in the coldest month of January and climb to an average high of 30.3°C (86.5°F) in the hot months of July and August. Rainfall isn't constant throughout the year; its distribution ranges from a maximum average of 265mm (10.43") in November to a minimum of 24mm (0.94") in July. Correspondingly, the number of rainfall days shifts from 15.3 in November to just 2.4 days in July. This variation in rainfall aligns with the shift in humidity, peaking at 75% in November and dipping to 52% in July.

As for daylight hours, December sees the least amount with an average of 9.1 hours daily, while June enjoys the most with an average of 15.3 hours. Sunshine duration follows a similar pattern; the longest hours are in July with 11.5 hours, and the shortest are in December with 3.6 hours. These changes in light availability illustrate the distinction between summer and winter months.

With consideration of the climatic parameters, the months from May to September present the most comfortable conditions for a visit to Trebinje. During this period, average temperatures rise above 20°C (68°F) and peak at 30.3°C (86.5°F) in July and August, with low humidity and rainfall levels providing for a warm, enjoyable atmosphere. In these months, daylight is abundant, averaging between 13.4 to 15.3 hours, and complimented with an average of 8.1 to 11.5 hours of sunshine.

The winter season between November to February is less favourable for visiting Trebinje due to its colder and wetter conditions. Average high temperatures decrease to 16.6°C (61.9°F) in November and continue to drop to 11.2°C (52.2°F) in January, with lows reaching 5.5°C (41.9°F). Rainfall levels and frequency increase substantially, peaking at 265mm (10.43") across 15.3 days in November. Besides, the shorter daylight hours and decreased sunshine duration contribute to the less hospitable conditions during these months.

Spring commences in March with the intervention of mild and gradually warming temperatures, stretching from an average low of 8.5°C (47.3°F) to a high of 14.4°C (57.9°F). These temperatures progressively increase through April and May, reaching an average high of 22.3°C (72.1°F) by the end of spring. Along with this warming trend, the rainfall pattern shows a slight drop from 133mm (5.24") in March, to an average of 76mm (2.99") in May. Correspondingly, there is an increase in daily sunlight from 12 hours in March to 14.6 hours in May.

Summers in Trebinje, running from June to August, present the warmest period of the year. June begins with an average high temperature of 26.2°C (79.2°F), escalating to a peak of 30.3°C (86.5°F) in July and August. Rainfall is relatively minimal, averaging from 24mm (0.94") to 49mm (1.93"), and fewer rainy days averaging between 2.4 to 6.7 days. Concurrently, daylight is plentiful, averaging from 14.6 to 15.3 hours, and augmented by sunshine hours from 8.1 to 11.5, making it an ideal period for outdoor activities.

Autumn weather features a downward transition, with temperatures dropping from a high of 20.4°C (68.7°F) in September to a cooler 12.4°C (54.3°F) in November. Similarly, the average low falls from 18.7°C (65.7°F) to 10.5°C (50.9°F) during the same period. Rainfall escalates quite drastically, going from 99mm (3.9") in September to a peak of 265mm (10.43") in November. The daylight duration shows a decrease from 11.1 hours in September to 9.8 hours in November, with fewer hours of sunshine in these months.

Winters in Trebinje witness low temperatures, with December starting at an average high of 12.4°C (54.3°F) and plummeting to an average of 5.5°C (41.9°F) by January. This colder climate continues into February with an average high temperature of 11.3°C (52.3°F). These months experience the highest levels of rainfall, averaging between 225mm (8.86") and 195mm (7.68"). Couplement to the heavy downpours, daylight averages are at their lowest with 9.1 hours in December and slightly higher at 9.5 hours in January. The amount of sunshine is also at its shortest, averaging 4.1 hours in January.

Trebinje, Bosnia and Herzegovina, welcomes the year with temperatures of 11.2°C (52.2°F) high and 5.5°C (41.9°F) low. January's weather reflects the depth of the Bosnian winter, with cold temperatures and relatively high humidity. Weather in January »

February's climate in Trebinje shows a slight improvement in terms of temperature from January. Compared to the previous month, February has higher humidity and nearly as much rain, but these conditions do not significantly alter the overall weather pattern. Weather in February »

March in Trebinje reveals a noticeable shift towards Spring. The month experiences a significant rise in temperatures, with highs of 14.4°C (57.9°F) and lows of 8.5°C (47.3°F). This improvement in conditions continues with an increase in daylight hours and sunshine hours, offering a brighter ambiance. Weather in March »

The weather conditions in April further indicate the establishment of spring in Trebinje. The distinctive features of April's weather manifest in warmer temperatures, reduced rainfall, and strikingly longer daylight hours. This progression in conditions from March to April continues the transition from winter’s cold and wet to a milder, sunnier period. Weather in April »

As Trebinje moves further into the year, May presents the initial indications of the imminent summer. Significant increases in temperature, sunshine hours, and daylight hours typify May, providing an enjoyable setting for outdoor activities. Weather in May »

The transition into full summer is evident in June in Trebinje. Characterized by warm temperatures, extended daylight hours, and minimum rainfall numbers, this period undoubtedly falls within the summer period. June’s weather carries on the trends set in May, with improvements primarily in temperatures and daylight. Weather in June »

In Trebinje, July is characterized by scorching temperatures, reaching a high of 30.3°C (86.5°F) and a low of 22.7°C (72.9°F). This period is undeniably the peak of summer, with lengthy daylight hours and a substantial drop in rainfall. Weather in July »

August continues the summer in Trebinje with similar conditions to those of July. This period of the year, marked by high temperatures, reduced rainfall, and abundant daylight, characterizes the ongoing summer. The exceptional amount of sunlight present in August contributes to its status as one of the brightest months. Weather in August »

The change in season becomes apparent in September in Trebinje with a shift towards autumn. The month is characterized by reduced temperatures and shorter daylight hours from August, indicating the start of the calm, transitional period. Weather in September »

October in Trebinje carries the autumnal weather themes further. Relative to September, October shows further reduction in temperature and daylight hours, pointing out the approaching winter. The transition from the heat of summer to the chill of winter becomes increasingly evident in October. Weather in October »

November demonstrates a clear shift to colder conditions in Trebinje, starkly contrasting with the previously warm months. Temperatures continue to fall, daylight diminishes, and rainfall surges to 265mm (10.43"). November serves as the transitional bridge from the moderate conditions of October to the noticeably chillier weather patterns in December. Weather in November »

The year concludes with December featuring the typical characteristics of winter weather in Trebinje, Bosnia and Herzegovina. After the changes experienced in November, December appears with colder temperatures, reduced daylight, and, most notably, substantial rainfall. Weather in December »