South India’s December Climate: A Guide to Weather, Travel, and Regional Nuances 

On 30 December, South India’s weather showcases distinct regional patterns: inland plateau cities like Hyderabad, Amaravati, and Bengaluru experience cool, crisp conditions with morning haze or mist, offering pleasant daytime temperatures ideal for outdoor exploration. In contrast, coastal cities face different challenges—Chennai encounters humid morning fog mist, while Thiruvananthapuram contends with tropical warmth, high humidity, and potential thunderstorms. This seasonal variation creates excellent travel conditions overall, particularly in interior regions where historical sites and nature excursions are most enjoyable, though visitors should prepare for chilly mornings inland, potential rainfall on the southwest coast, and generally crowded tourist destinations during this peak season.

South India’s December Climate: A Guide to Weather, Travel, and Regional Nuances 

As December unfolds across South India, the region enters a period of pleasant transition. The intense heat of summer and the torrential rains of the monsoon give way to a season characterized by moderate temperatures, lower humidity, and generally clear skies. However, as a recent forecast for major cities reveals, this “winter” period brings its own distinct atmospheric personality to each urban center—from the morning mists of Bengaluru to the coastal humidity of Chennai. 

This guide delves into the specific weather forecast for key South Indian cities at the close of 2025, exploring what these conditions mean for daily life, travel, and experiencing the rich cultural tapestry of the region during this favored time of year. 

The Atmospheric Shift: Winter in South India 

Meteorologically, December marks the beginning of the northeast monsoon’s retreat in many parts of South India. Unlike the dramatic winters of northern India, southern winters are mild. The sun is less intense, and the air, particularly in the inland Deccan plateau cities like Hyderabad and Bengaluru, turns crisp, especially in the early mornings and evenings. 

This season is often considered the optimal time for tourism, with outdoor activities, heritage site visits, and festival hopping becoming particularly enjoyable. The weather patterns, however, are not uniform. They are sculpted by diverse geography: the elevated plateau, the long coastline along the Arabian Sea and Bay of Bengal, and the forested Western Ghats each create unique microclimates. 

City-by-City Forecast and Implications 

The forecast for 30 December 2025 provides a precise snapshot of these regional variations. The following table summarizes the expected conditions across five major urban centers. 

Hyderabad: The Plateau’ Haze 

Hyderabad’s forecast of a partly cloudy sky with haze and a comfortable temperature range is typical for December. The haze is often a combination of moisture and lingering particulate matter, softened by the winter light. It creates a distinctive, soft-focus glow over the city’s iconic sites like Golconda Fort and Hussain Sagar Lake. With low humidity and no weather warnings, it’s an ideal day for exploring the city’s bustling bazaars and open-air monuments. 

Amaravati & Bengaluru: The Morning Fog Belt 

Cities on the interior plateau, like Amaravati and Bengaluru, are prone to radiation fog on calm, clear winter nights. Amaravati’s shallow fog and Bengaluru’s mist are manifestations of this, where the ground cools rapidly, condensing moisture in the air. For residents, this means chilly mornings that demand a light sweater. For travelers, it could mean slightly delayed morning commutes or flights. However, this mist usually burns off by 9 or 10 AM, revealing bright, sunny skies and creating perfect conditions for a late-morning visit to Bengaluru’s gardens or a stroll through Amaravati’s developing capital region. 

Thiruvananthapuram: The Tropical Coast 

In stark contrast to the inland cities, Kerala’s capital, Thiruvananthapuram, faces a possibility of moderate rain or thunderstorms alongside high humidity. This reflects the lingering influence of the northeast monsoon on the southwestern coast. December here is warm and tropical. A partly cloudy sky offers respite from the sun, but the high chance of precipitation means it’s wise to plan outdoor activities flexibly and always carry an umbrella. The silver lining is that this weather keeps the lush greenery of the city and nearby Kovalam beach vibrantly alive. 

Chennai: The Eastern Seaboard’s Humidity 

Chennai’s weather—fog mist in the morning giving way to a partly cloudy sky—highlights its coastal, humid character. The “fog mist” is likely a mix of sea mist and urban condensation. While temperatures are pleasant, the humidity levels remain noticeable. The morning mist can obscure views of the Marina Beach but adds a dramatic atmosphere. As it clears, the day becomes suitable for visiting cultural sites like Kapaleeshwarar Temple or the Government Museum. 

Beyond the Forecast: Understanding December’s Climate Patterns 

The single-day forecast is a point within a broader seasonal pattern. Historical data shows that December is generally a dry and favorable month across the region, but with key differences: 

• Rainfall Gradient: The coast receives more moisture. Chennai, for instance, has historically seen an average of 193 mm of rainfall in December, spread over a handful of days. Inland Amaravati, by contrast, often sees virtually no rain during the month. 

• Temperature Range: The interior experiences a wider diurnal range. A day in Bengaluru or Hyderabad can start near 15°C and rise to a warm 28°C. Coastal cities like Chennai and Thiruvananthapuram have a much narrower range, with nights remaining well above 20°C. 

• The “Winter” Spectrum: For a traveler from North India or colder climates, only the plateau cities will feel recognizably “wintery” in the mornings. The coastal cities offer a warm, tropical escape from harsher winters elsewhere. 

Travel and Cultural Context in the December Season 

This weather backdrop sets the stage for a vibrant travel period. December coincides with the peak tourist season across South India. The pleasant climate makes it ideal for: 

• Exploring Heritage Sites: From the ruins of Hampi to the temples of Mahabalipuram, comfortable daytime temperatures make extensive outdoor exploration enjoyable. 

• Attending Festivals: While the major harvest festival of Pongal/Makar Sankranti falls in mid-January, the Christmas and New Year period is celebrated with great enthusiasm, especially in cities like Bengaluru and in the Christian-majority areas of Kerala. 

• Experiencing Natural Beauty: The weather is perfect for the hill stations of the Western Ghats (like Ooty or Munnar), which are cool and lush, and for wildlife safaris in parks like Nagarhole or Bandipur, where animal sightings are more common as wildlife congregates around water sources. 

Important Travel Note: Due to the high season, it is highly advisable to book accommodations and travel well in advance. Prices for flights and hotels are at their annual peak. 

Navigating the Conditions: Practical Tips 

Based on the forecast and seasonal norms, here’s how to prepare: 

• Packing: Layering is essential. Pack light sweaters, jackets, and stoles for the inland cities (Hyderabad, Amaravati, Bengaluru), which you can shed by late morning. For the coastal cities (Chennai, Thiruvananthapuram), light cotton or linen clothing is suitable year-round, but carry a raincoat or umbrella. 

• Health: The drop in temperature, especially in the plateau, can be abrupt. It’s common to experience minor colds or throat irritation. Staying hydrated is important even in the cooler weather. 

• Transportation: If you have an early morning flight or train, particularly from Bengaluru or Hyderabad, account for potential delays due to reduced visibility. Road travel on highways can also be affected by early morning fog patches. 

In summary, South India in December presents a compelling and diverse climatic portrait. Whether you’re navigating the misty lanes of Bengaluru, basking in the sunny, historic grandeur of Hyderabad, or feeling the tropical breeze in Thiruvananthapuram, understanding these weather nuances enriches the experience, allowing you to plan better and immerse yourself more fully in the region’s unique winter charm.