Climate and monthly weather forecast
San Fernando, Trinidad and Tobago

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The climate of San Fernando

San Fernando, a city located in Trinidad and Tobago, is subject to a tropical monsoon climate as defined by the Köppen climate classification. This categorisation, marked as 'Am', reflects weather patterns that portray relatively consistent high temperatures and substantial precipitation throughout the year.

Evaluating the climatological data, it becomes apparent that temperature values remain consistently high, irrespective of the month. High monthly temperatures range from 28.2°C (82.8°F) to 30.5°C (86.9°F) while low temperatures hover between 24.7°C (76.5°F) and 26.5°C (79.7°F), depicting a relatively narrow temperature range. This consistency is concurrent with the tropical climate.

Precipitation patterns manifest in considerable volume throughout the year, with an increasing trend noticed from May, peaking in August, at 97mm (3.82"), and relaxing somewhat in the following months. The highest number of rain days is observed in July with 22.7 days, indicating a pronounced rainy season.

Another characteristic of San Fernando's climate is its relative humidity levels which, much like the temperature, remain fairly consistent across the year, fluctuating mildly between 74% and 78%.

The best time to visit San Fernando

Given San Fernando's tropical monsoon climate, the best time to visit the city is during the relatively drier period of the year. This spans from February to April when the city records less rainfall compared to other months. Specifically, April stands out as an ideal month due to lower rainfall levels at 17mm (0.67"), and the lower number of rain days at 11.6, coupled with the pleasant high temperatures, reaching up to 29.6°C (85.3°F).

The worst time to visit San Fernando

On the contrary, the less favourable time for a visit to San Fernando would be from June to September. These months correspond to the peak of the monsoon season when the city experiences a high amount of rainfall. August, in particular, reports the highest rainfall at 97mm (3.82") and a significant number of rainy days amounting to 21.9 days in the month.

Spring weather in San Fernando

Spring season in the city of San Fernando, consistent with its tropical monsoon climate, does not exhibit significant deviations in temperature and humidity. High temperatures during spring, from March to May, fluctuate between 28.9°C (84°F) in March and 29.8°C (85.6°F) in May. Likewise, low temperatures display a gradual increase from 25.2°C (77.4°F) to 26.2°C (79.2°F). Spring also welcomes a progressive increase in rainfall, advancing from 19mm (0.75") in March, through 17mm (0.67") in April, to 20mm (0.79") in May.

Summer weather in San Fernando

Summer in San Fernando, extending from June through August, is marked by the onset of monsoon. The city experiences its highest levels of rainfall during this period, peaking at 97mm (3.82") in August. Concurrently, the number of rainy days escalates, reaching a high of 22.7 days in July. Despite the increased precipitation, temperatures remain high, with the highest recorded temperature of 30.2°C (86.4°F) in August.

Autumn weather in San Fernando

The autumn months, from September to November, while still recording considerable rainfall, signify a slight decrease from the summer highs. The rainfall reduces progressively from 61mm (2.4") in September to 63mm (2.48") in November. Nevertheless, the temperature continues to remain relatively high during these months, with highest temperatures lying between 30.4°C (86.7°F) to 29.5°C (85.1°F).

Winter weather in San Fernando

The winter season in San Fernando, characterised from December to February, exhibits comparatively lower rainfall along with continued high temperatures. The rainfall reduces to a low of 20mm (0.79") in February, while temperatures range from 28.7°C (83.7°F) in December to 28.8°C (83.8°F) in February. This period offers relatively more sunshine as well, making it a delightful time to explore the city.

Weather in January

Traditionally, the year in San Fernando, Trinidad and Tobago, starts with favorable weather conditions. January offers relatively cooler temperatures contrasted with light rain and a letting of winds. The month picks up from its predecessor and sets the pace for the rest of the year. Weather in January »

Weather in February

As the year progresses, the weather marginally warms up in February. This shift in temperature does not significantly affect the overall climate, still making it comfortable enough for outdoor activities. The humidity remains almost similar to January's levels. Weather in February »

Weather in March

March weather maintains the favorable conditions seen in the previous months. Despite a slight increase in temperature, the days remain sunny with a pleasant sea breeze. The warmth and the low rainfall in this month make it an ideal time for beach visits. Weather in March »

Weather in April

April presents the onset of hotter temperatures, preceding the intense heat usually experienced in the coming summer months. Notwithstanding the rising mercury levels, the climate remains agreeable. The month also indicates the onset of longer daylight hours. Weather in April »

Weather in May

May ushers in a significant shift in San Fernando's climatic pattern. The rise in temperatures witnessed over the previous months becomes more pronounced, and there is a discernible increase in relative humidity. The locals prepare for the approaching rainy season by the end of this month. Weather in May »

Weather in June

June announces the arrival of the rainy season in San Fernando - the weather turns notably wetter compared with the preceding months. Concurrently, the days become longer, with the sun barely setting, creating an interesting contrast of abundant rainfall and extended sunlight. Weather in June »

Weather in July

July continues to bring high levels of rainfall and warm temperatures, making the weather humid and sticky. Despite these conditions, life in San Fernando carries on, with locals and visitors obliged to carry umbrellas. Temperatures in July remain high, with the mercury touching 29.7°C (85.5°F) at its highest and accommodating a low of 25.8°C (78.4°F). Weather in July »

Weather in August

With the progression of the rainy season, August experiences the year's highest average temperature and a continuous downpour. However, the sea temperatures experience a slight rise, providing relief to the inhabitants. The rain pelts down on 21.9 days, accumulating 97mm (3.82") - the highest for the year. Weather in August »

Weather in September

September witnesses a reduction in rainfall and wind speed, providing relief from the steady showers experienced in the months before. The reduction in cloud cover implies more sunny days, and sea temperatures remain warm. The difference in maximum and minimum temperatures stays almost the same, with the highest being 30.5°C (86.9°F) and the lowest at 26.5°C (79.7°F). Weather in September »

Weather in October

October's weather presents a gradual transition from the wet season's end towards the relatively dry and cool conditions of the coming months. The climate remains comfortably warm, providing suitable conditions for outdoor festivities. Weather in October »

Weather in November

November, particularly its latter half, brings about a marked decrease in rainfall and a moderate drop in temperature. The changes indicate the impending arrival of the dry season. The city's inhabitants enjoy the comfortable temperatures between the month's 29.5°C (85.1°F) high and a low of 26.1°C (79°F). Weather in November »

Weather in December

The year in San Fernando wraps up, fittingly, with the coolest month. December beckons the arrival of peak tourist season, thanks to the drier weather and significantly lower temperatures. The climatic parameters echo the city's festive spirit with comfortable days and cooler evenings. Weather in December »
Updated: Feb 4, 2024 | Published by: Weather Atlas | About Us

Frequently asked questions

What is the coldest time of year in San Fernando?

The coldest period in San Fernando tends to be January, when average temperatures fluctuate between a high of 28.2°C (82.8°F) and a low of 24.8°C (76.6°F).

How many days does it rain in San Fernando?

In San Fernando, during the entire year, the rain falls for 202.6 days and collects up to 599mm (23.58") of precipitation.

When is the highest UV index in San Fernando?

The months with the highest UV index in San Fernando are January through December, with an average maximum UV index of 7.

When is the lowest UV index in San Fernando?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in San Fernando.

What is the month with the coldest sea water in San Fernando?

With an average sea temperature of 27.1°C (80.8°F), February is the month with the coldest seawater.

What are the least humid months in San Fernando?

The months with the lowest humidity in San Fernando, Trinidad and Tobago, are March and April, with an average relative humidity of 74%.

What is the driest month in San Fernando?

The month with the least rainfall is April, when the rain falls for 11.6 days and typically collects 17mm (0.67") of precipitation.

When are the longest days in San Fernando?

June has the longest days of the year in San Fernando, with an average of 12h and 42min of daylight.

What are the most humid months in San Fernando?

The months with the highest humidity in San Fernando are July, November and December, with an average relative humidity of 78%.

What is the rainiest month in San Fernando?

August is the month with the most rainfall in San Fernando, Trinidad and Tobago. Rain falls for 21.9 days and accumulates 97mm (3.82") of precipitation.

What are the months with the most sunshine in San Fernando?

August and September, with an average of 11.1h of sunshine, are months with the most sunshine.

What is the hottest time of year in San Fernando?

San Fernando, Trinidad and Tobago, witnesses the warmest weather in September, with temperatures averaging a high of 30.5°C (86.9°F) and a low of 26.5°C (79.7°F).

When is the sea warmest in San Fernando?

The month with the warmest seawater is September, with an average sea temperature of 29.3°C (84.7°F).

What is the month with the shortest days in San Fernando?

December has the shortest days of the year, with an average of 11h and 30min of daylight.

Is there Daylight Saving Time (DST) in San Fernando?

San Fernando does not utilize Daylight Saving Time (DST). AST timezone is used over the entire year.

What is the month with the least sunshine in San Fernando?

With an average of 6.7h of sunshine, December has the least sunshine of the year in San Fernando, Trinidad and Tobago.

Average temperature
San Fernando, Trinidad and Tobago

Average temperature - San Fernando, Trinidad and Tobago

The warmest month (with the highest average high temperature) is September (30.5°C).
The month with the lowest average high temperature is January (28.2°C).

The months with the highest average low temperature are September and October (26.5°C).
The coldest month (with the lowest average low temperature) is February (24.7°C).

Average pressure
San Fernando, Trinidad and Tobago

Average pressure - San Fernando, Trinidad and Tobago

The month with the highest atmospheric pressure is June (1013.7mbar).
The month with the lowest atmospheric pressure is November (1010.3mbar).

Average wind speed
San Fernando, Trinidad and Tobago

Average wind speed - San Fernando, Trinidad and Tobago

The windiest month (with the highest average wind speed) is May (17km/h).
The calmest month (with the lowest average wind speed) is August (12.6km/h).

Average humidity
San Fernando, Trinidad and Tobago

Average humidity - San Fernando, Trinidad and Tobago

The months with the highest relative humidity are July, November and December (78%).
The months with the lowest relative humidity are March and April (74%).

Average rainfall
San Fernando, Trinidad and Tobago

Average rainfall - San Fernando, Trinidad and Tobago

The wettest month (with the highest rainfall) is August (97mm).
The driest month (with the least rainfall) is April (17mm).

Average rainfall days
San Fernando, Trinidad and Tobago

Average rainfall days - San Fernando, Trinidad and Tobago

The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is April (11.6 days).

Average sea temperature
San Fernando, Trinidad and Tobago

Average sea temperature - San Fernando, Trinidad and Tobago

The best month for swimming (with the highest average sea temperature) is September (29.3°C).
The coldest month (with the lowest average sea temperature) is February (27.1°C).

Average daylight / Average sunshine
San Fernando, Trinidad and Tobago

Average daylight / Average sunshine - San Fernando, Trinidad and Tobago

The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 30min).

The months with the most sunshine are August and September (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

Average sunshine days
San Fernando, Trinidad and Tobago

Average sunshine days - San Fernando, Trinidad and Tobago

The month with the most sunshine days is April (14.3 days).
The month with the least sunshine days is July (5.6 days).

Average UV index
San Fernando, Trinidad and Tobago

Average UV index - San Fernando, Trinidad and Tobago

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

Average visibility
San Fernando, Trinidad and Tobago

Average visibility - San Fernando, Trinidad and Tobago

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

San Fernando, Trinidad and Tobago

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