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Contents
- The climate of Jaco
- The best time to visit Jaco
- The worst time to visit Jaco
- Spring weather in Jaco
- Summer weather in Jaco
- Autumn weather in Jaco
- Winter weather in Jaco
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Jaco
Situated on the Pacific coast of Costa Rica, Jaco experiences a tropical wet and dry climate according to the Köppen climate classification. Here, the weather can be characterized by high temperatures and significant rainfall that comes in seasonal patterns.
Throughout the year, there is a clear warming trend in the daytime temperatures, reaching a high of 30.4°C (86.7°F) in the month of April and dipping to a minimum of 28.1°C (82.6°F) in October. Night temperatures too follow a similar pattern - progressively rising from 24.5°C (76.1°F) in January to a peak of 26.2°C (79.2°F) in May, and gradually cooling down to 24.6°C (76.3°F) by December.
Humidity predominantly remains high, oscillating between 68% in February and March to a high of 80% seen in June and October. Precipitation in Jaco is substantial, with more than 1500mm (59.06") falling annually. The wettest months are typically seen between May and October. The rainfall is at its peak in October, reaching as much as 383mm (15.08"). Conversely, February witnesses the least rainfall, at just 11mm (0.43").
Taking into account hours of sunshine reveals that the longest days occur between May and July with an average daylight hours of about 12.7 hours. June seems to be the sunniest month with a maximum of 10.1 hours while the least sunshine, averaging at 8.1 hours, is observed during October.
Overall, the climate of Jaco shows considerable variations in several parameters, creating a weather mosaic that ranges from dry and sweltering to wet and steamy.
Throughout the year, there is a clear warming trend in the daytime temperatures, reaching a high of 30.4°C (86.7°F) in the month of April and dipping to a minimum of 28.1°C (82.6°F) in October. Night temperatures too follow a similar pattern - progressively rising from 24.5°C (76.1°F) in January to a peak of 26.2°C (79.2°F) in May, and gradually cooling down to 24.6°C (76.3°F) by December.
Humidity predominantly remains high, oscillating between 68% in February and March to a high of 80% seen in June and October. Precipitation in Jaco is substantial, with more than 1500mm (59.06") falling annually. The wettest months are typically seen between May and October. The rainfall is at its peak in October, reaching as much as 383mm (15.08"). Conversely, February witnesses the least rainfall, at just 11mm (0.43").
Taking into account hours of sunshine reveals that the longest days occur between May and July with an average daylight hours of about 12.7 hours. June seems to be the sunniest month with a maximum of 10.1 hours while the least sunshine, averaging at 8.1 hours, is observed during October.
Overall, the climate of Jaco shows considerable variations in several parameters, creating a weather mosaic that ranges from dry and sweltering to wet and steamy.
The best time to visit Jaco
Keeping in mind the rainfall and temperature patterns, the ideal period to visit Jaco falls between December and April. During these months, rainfall is at its minimal, while the temperatures are moderately high, creating comfortable conditions for outdoor activities.
The worst time to visit Jaco
Conversely, the period from May to October does not afford the best weather conditions for a visit. The frequency of heavy rains and high humidity levels give these months a propensity for cloudy and saturated conditions, partially blotting out the sunlight and making outdoor excursions less pleasant.
Spring weather in Jaco
Spring weather in Jaco, which occurs from March to May, is characterized by increasing temperatures. These months witness highs nearing 30°C (86°F) and lows in the mid-20s°C. Well defined rainfall patterns emerge, transitioning from a drier March to a notably wet May.
Summer weather in Jaco
The summer months are the wettest in Jaco, with rainfall ranging from 161mm (6.34") in June to a whopping 383mm (15.08") in October. While the temperature continues to hover around 30°C (86°F) in the early summer, it experiences a slight fall in the latter part of the season. Humidity too peaks during these months, making the weather intensely moist and tropical.
Autumn weather in Jaco
During the autumn months from September to November, Jaco continues to experience heavy rainfall. Simultaneously, the temperature begins its slow descent from highs of 28.8°C (83.8°F) in September to 28.3°C (82.9°F) in November, and the total daylight hours begin to shorten.
Winter weather in Jaco
Winter in Jaco is marked by more comfortable weather conditions. Between December and February, temperatures show a marginal downward trend, reaching a minimum of 29.5°C (85.1°F) in February. Rainfall is much less significant during these months, averaging at about 20mm (0.79") per month. A return to increased hours of sunshine renders a cheerful ambiance to the winter season.
Weather in January
January sees a transition period in Jaco, Costa Rica, as the dry season starts to settle. Temperatures remain steady, ranging from 24.5°C (76.1°F) to 29.5°C (85.1°F), providing warmth without it being stifling. The relative humidity is at 70%, contributing to an overall comfortable climate, making January a welcoming month for outdoor activities. Weather in January »
Weather in February
As with January, February continues the dry season run in Jaco, Costa Rica boasting an increase in sunshine hours. The average rainfall drops to 11mm (0.43"), marking a dryer period compared to the previous month. Visitors can expect lower cloud coverage, resulting in bright and sun-filled days. Weather in February »
Weather in March
March is considered one of the driest months in Jaco, Costa Rica, with tourists flocking to take advantage of the favourable weather conditions. The month witnesses a slight increase in temperatures, maintaining its dry season characteristics with minimal rainfall. Weather in March »
Weather in April
The weather in Jaco, Costa Rica, takes a turn in April with an incredible spike in rainfall to 68mm (2.68") from 17mm (0.67") in March. Despite this shift, temperatures continue to rise steadily, touching the warmest point of the year. Weather in April »
Weather in May
In Jaco, Costa Rica, May marks the beginning of the rainy season. The average rainfall sees a significant jump to 201mm (7.91"), signalling the start of the wet period. Despite high rainfall, it is counterbalanced by long hours of daylight. Weather in May »
Weather in June
June continues the rainy season trend in Jaco, Costa Rica, with high humidity and rainfall becoming the norm. Nevertheless, sunlight hours remain high, ensuring bright days and vibrant sunsets in between the showers. The sea remains warm and inviting for those willing to venture outdoors. Weather in June »
Weather in July
July in Jaco, Costa Rica witnesses a plateauing of weather conditions, with temperatures, rainfall and humidity all seeing minor variations. The weather maintains a wet season pattern, often characterized by morning sunshine followed by afternoon rains. Weather in July »
Weather in August
In Jaco, Costa Rica, August serves as a continuation of the wet season, offering similar weather patterns to July. Impressively, sea temperatures remain consistently warm and inviting throughout the month. Predominant weather features include high humidity and significant rainfall, although followed by periods of bright sunshine. Weather in August »
Weather in September
September in Jaco, Costa Rica, is characterised by noticeable rainfall, with 383mm (15.08"), an impressive rise from 131mm (5.16") in August, marking it as the wettest month. Despite this, temperatures maintain a warm and inviting climate. Weather in September »
Weather in October
In Jaco, Costa Rica, October follows September's trend with high rainfall and humidity affecting the overall weather pattern. Despite this, there are still plenty of hours of sunshine, illuminated by the vibrant flora brought about by the rains. Weather in October »
Weather in November
November sees a downward trend in rainfall, from 383mm (15.08") in October to 130mm (5.12"), signifying the looming end of the rainy season in Jaco, Costa Rica. Despite this, temperatures hold steady, offering warm and comfortable weather. Weather in November »
Weather in December
December in Jaco, Costa Rica, signals the arrival of the much-awaited dry season. The month witnesses a significant decrease in rainfall to 41mm (1.61"), a stark contrast to the preceding wet months. Longer sunlight hours, decreased cloud cover, and lower humidity present an attractive weather combination for visitors. Weather in December »
[Resources]Frequently asked questions
How much does it rain in Jaco?
In Jaco, Costa Rica, during the entire year, the rain falls for 236.2 days and collects up to 1501mm (59.09") of precipitation.
What are the months with the highest UV index in Jaco?
The months with the highest UV index are January through December, with an average maximum UV index of 7.
What is the month with the lowest UV index in Jaco?
January through December, with an average maximum UV index of 7, are months with the lowest UV index.
What is the least humid month in Jaco?
The months with the lowest humidity in Jaco, Costa Rica, are February and March, with an average relative humidity of 68%.
What is the driest month in Jaco?
February is the month with the least rainfall in Jaco. Rain falls for 7.8 days and accumulates 11mm (0.43") of precipitation.
What month is the sea warmest in Jaco?
With an average sea temperature of 29.4°C (84.9°F), March is the month with the warmest seawater.
What is the hottest time of year in Jaco?
April is the warmest month in Jaco, with the temperature often reaching an average high of 30.4°C (86.7°F) and an average low of 26.2°C (79.2°F).
What are the most humid months in Jaco?
The months with the highest humidity in Jaco, Costa Rica, are June and October, with an average relative humidity of 80%.
When are the longest days in Jaco?
June has the longest days of the year in Jaco, with an average of 12h and 42min of daylight.
What month has the most sunshine in Jaco?
With an average of 10.1h of sunshine, July has the most sunshine of the year.
What time of the year is the coldest in Jaco?
With average temperatures fluctuating between a high of 28.1°C (82.6°F) and a low of 25.2°C (77.4°F), October stands out as the coldest month in Jaco.
What is the wettest month in Jaco?
The month with the most rainfall is October, when the rain falls for 26.1 days and typically aggregates up to 383mm (15.08") of precipitation.
What is the month with the least sunshine in Jaco?
The month with the least sunshine in Jaco, Costa Rica, is October, with an average of 8.1h of sunshine.
What month is the sea coldest in Jaco?
November is the month with the coldest seawater in Jaco, Costa Rica, with an average sea temperature of 27.8°C (82°F).
What is the month with the shortest days in Jaco?
December has the shortest days of the year in Jaco, Costa Rica, with an average of 11h and 36min of daylight.
Is there Daylight Saving Time (DST) in Jaco?
Jaco, Costa Rica, does not utilize Daylight Saving Time (DST). CST timezone is used over the entire year.
Average temperature
Jaco, Costa Rica
The warmest month (with the highest average high temperature) is April (30.4°C).
The month with the lowest average high temperature is October (28.1°C).
The months with the highest average low temperature are April and May (26.2°C).
The coldest month (with the lowest average low temperature) is January (24.5°C).
Average pressure
Jaco, Costa Rica
- Average pressure in January:
1011.4mbar - Average pressure in February:
1011.1mbar - Average pressure in March:
1011.2mbar - Average pressure in April:
1010.8mbar - Average pressure in May:
1010.8mbar - Average pressure in June:
1010.9mbar
- Average pressure in July:
1011mbar - Average pressure in August:
1011mbar - Average pressure in September:
1010.9mbar - Average pressure in October:
1010.7mbar - Average pressure in November:
1010.6mbar - Average pressure in December:
1011mbar
The month with the highest atmospheric pressure is January (1011.4mbar).
The month with the lowest atmospheric pressure is November (1010.6mbar).
Average wind speed
Jaco, Costa Rica
- Average wind speed in January:
9km/h - Average wind speed in February:
9.5km/h - Average wind speed in March:
9.7km/h - Average wind speed in April:
9km/h - Average wind speed in May:
7.9km/h - Average wind speed in June:
7.6km/h
- Average wind speed in July:
7.8km/h - Average wind speed in August:
7.8km/h - Average wind speed in September:
7.7km/h - Average wind speed in October:
8.3km/h - Average wind speed in November:
7.9km/h - Average wind speed in December:
8.1km/h
The windiest month (with the highest average wind speed) is March (9.7km/h).
The calmest month (with the lowest average wind speed) is June (7.6km/h).
Average humidity
Jaco, Costa Rica
The months with the highest relative humidity are June and October (80%).
The months with the lowest relative humidity are February and March (68%).
Average rainfall
Jaco, Costa Rica
- Average rainfall in January:
22mm - Average rainfall in February:
11mm - Average rainfall in March:
17mm - Average rainfall in April:
68mm - Average rainfall in May:
201mm - Average rainfall in June:
161mm
- Average rainfall in July:
167mm - Average rainfall in August:
169mm - Average rainfall in September:
131mm - Average rainfall in October:
383mm - Average rainfall in November:
130mm - Average rainfall in December:
41mm
The wettest month (with the highest rainfall) is October (383mm).
The driest month (with the least rainfall) is February (11mm).
Average rainfall days
Jaco, Costa Rica
- Average rainfall days in January:
9.3 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
10.4 days - Average rainfall days in April:
20.3 days - Average rainfall days in May:
25.3 days - Average rainfall days in June:
24.7 days
- Average rainfall days in July:
24.3 days - Average rainfall days in August:
23.3 days - Average rainfall days in September:
23.6 days - Average rainfall days in October:
26.1 days - Average rainfall days in November:
24.8 days - Average rainfall days in December:
16.3 days
The month with the highest number of rainy days is October (26.1 days).
The month with the least rainy days is February (7.8 days).
Average sea temperature
Jaco, Costa Rica
The best month for swimming (with the highest average sea temperature) is March (29.4°C).
The coldest month (with the lowest average sea temperature) is November (27.8°C).
Average daylight / Average sunshine
Jaco, Costa Rica
- Average daylight in January:
11h and 4min - Average daylight in February:
11h and 5min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 2min - Average daylight in May:
12h and 4min - Average daylight in June:
12h and 4min
- Average daylight in July:
12h and 4min - Average daylight in August:
12h and 2min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 5min - Average daylight in November:
11h and 4min - Average daylight in December:
11h and 4min
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 36min).
- Average sunshine in January:
8h and 4min - Average sunshine in February:
9h and 2min - Average sunshine in March:
9h and 5min - Average sunshine in April:
9h and 2min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
8h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
8h and 1min - Average sunshine in November:
8h and 4min - Average sunshine in December:
9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is October (Average sunshine: 8h and 6min).
Average sunshine days
Jaco, Costa Rica
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
16.8 days - Average sunshine days in March:
18.6 days - Average sunshine days in April:
7.9 days - Average sunshine days in May:
4.3 days - Average sunshine days in June:
4.6 days
- Average sunshine days in July:
5.4 days - Average sunshine days in August:
6.8 days - Average sunshine days in September:
5.9 days - Average sunshine days in October:
4.5 days - Average sunshine days in November:
4.5 days - Average sunshine days in December:
11.7 days
The month with the most sunshine days is March (18.6 days).
The month with the least sunshine days is May (4.3 days).
Average UV index
Jaco, Costa Rica
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 cloud cover
Jaco, Costa Rica
The month with the most cloud cover is October (Cloud cover 44).
The month with the least cloud cover is February (Cloud cover 13).
Average visibility
Jaco, Costa Rica
The months with the highest visibility are January, February, March, April, June, July, August, September, November and December (10km).
The months with the lowest visibility are May and October (9km).
Jaco, Costa Rica
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