Monthly weather forecast and climate
Boston, Costa Rica

Weather in January

January, the same as December, is a moderately hot winter month in Boston, Costa Rica, with average temperature fluctuating between 22.9°C (73.2°F) and 27.6°C (81.7°F). With an average high-temperature of 27.6°C (81.7°F) and an average low-temperature of 22.9°C (73.2°F), January is the coldest month. The average heat index is appraised at a hot 30.1°C (86.2°F). Weather in January »

Weather in February

The last month of the winter, February, is also a moderately hot month in Boston, Costa Rica, with average temperature varying between 22.8°C (73°F) and 27.8°C (82°F). In Boston, the average high-temperature is essentially the same as in January - a still warm 27.8°C (82°F). Weather in February »

Weather in March

March, the first month of the spring, in Boston, is still a warm month, with average temperature varying between 28.3°C (82.9°F) and 23.1°C (73.6°F). In Boston, the average high-temperature in March is almost the same as in February - a still warm 28.3°C (82.9°F). Weather in March »

Weather in April

April, the same as March, is another warm spring month in Boston, Costa Rica, with temperature in the range of an average high of 29.2°C (84.6°F) and an average low of 24.3°C (75.7°F). In Boston, the average high-temperature in April is relatively the same as in March - a still moderately hot 29.2°C (84.6°F). Weather in April »

Weather in May

The last month of the spring, May, is another warm month in Boston, Costa Rica, with average temperature ranging between min 25.3°C (77.5°F) and max 29.7°C (85.5°F). In Boston, the average high-temperature is almost the same as in April - a still moderately hot 29.7°C (85.5°F). Weather in May »

Weather in June

June, the first month of the summer, in Boston, is also a moderately hot month, with average temperature ranging between min 25.3°C (77.5°F) and max 29.7°C (85.5°F). In June, the average high-temperature remains equal as in May - a still warm 29.7°C (85.5°F). Weather in June »

Weather in July

July, like June, in Boston, Costa Rica, is a moderately hot summer month, with average temperature ranging between max 29.1°C (84.4°F) and min 24.8°C (76.6°F). In Boston, the average high-temperature is almost the same as in June - a still warm 29.1°C (84.4°F). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Boston, Costa Rica, with average temperature ranging between max 29.7°C (85.5°F) and min 24.9°C (76.8°F). In August, the average high-temperature is practically the same as in July - a still moderately hot 29.7°C (85.5°F). Weather in August »

Weather in September

September, the first month of the autumn, in Boston, is a hot month, with average temperature varying between 30°C (86°F) and 25°C (77°F). September is the warmest month, with an average high-temperature of 30°C (86°F) and an average low-temperature of 25°C (77°F). In September, the average heat index is evaluated at a sweltering 35.3°C (95.5°F). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in Boston, Costa Rica, with average temperature ranging between max 29.6°C (85.3°F) and min 25.1°C (77.2°F). In October, the average high-temperature is practically the same as in September - a moderately hot 29.6°C (85.3°F). Weather in October »

Weather in November

November, the last month of the autumn, in Boston, is another warm month, with temperature in the range of an average low of 24.3°C (75.7°F) and an average high of 28.8°C (83.8°F). In November, the average high-temperature is almost the same as in October - a still warm 28.8°C (83.8°F). Weather in November »

Weather in December

December, the first month of the winter, in Boston, is still a warm month, with average temperature fluctuating between 23.4°C (74.1°F) and 28.2°C (82.8°F). In December, the average high-temperature is essentially the same as in November - a still moderately hot 28.2°C (82.8°F). Weather in December »
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FAQ

What is the coldest month in Boston?

With an average high-temperature of 27.6°C (81.7°F) and an average low-temperature of 22.9°C (73.2°F), January is the coldest month.

How much does it rain in Boston?

Throughout the year, in Boston, Costa Rica, there are 241.5 rainfall days, and 1580mm (62.2") of precipitation is accumulated.

When is the lowest UV index in Boston?

January, February and December, with an average maximum UV index of 6, are months with the lowest UV index in Boston, Costa Rica.

When is the highest UV index in Boston?

Months with the highest UV index in Boston are March through November, with an average maximum UV index of 7.

What is the driest month in Boston?

The month with the least rainfall in Boston is April when the rain falls for 16.8 days and typically collects 65mm (2.56") of precipitation.

What is the most humid month in Boston?

May and June, with an average relative humidity of 74%, are most humid months.

When are the longest days in Boston?

The month with the longest days in Boston is June, with an average of 12.7h of daylight.

What is the rainiest month in Boston?

The month with the most rainfall is July when the rain falls for 25.8 days and typically aggregates up to 203mm (7.99") of precipitation.

What is the warmest month in Boston?

The warmest month in Boston is September, with an average high-temperature of 30°C (86°F) and an average low-temperature of 25°C (77°F).

What is the least humid month in Boston?

With an average relative humidity of 71%, September is the least humid month.

What month has the most sunshine in Boston?

With an average of 9.2h of sunshine, September has the most sunshine of the year in Boston.

What is the month with the shortest days in Boston?

December has the shortest days of the year, with an average of 11.5h of daylight.

What is the month with the least sunshine in Boston?

With an average of 7.3h of sunshine, December has the least sunshine of the year.

Average temperature
Boston, Costa Rica

Average temperature - Boston, Costa Rica

The warmest month (with the highest average high temperature) is September (30°C).
The month with the lowest average high temperature is January (27.6°C).

Months with the highest average low temperature are May and June (25.3°C).
The coldest month (with the lowest average low temperature) is February (22.8°C).

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Average pressure
Boston, Costa Rica

Average pressure - Boston, Costa Rica

The month with the highest atmospheric pressure is January (1013.1mbar).
The month with the lowest atmospheric pressure is October (1010.9mbar).

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Average wind speed
Boston, Costa Rica

Average wind speed - Boston, Costa Rica

The windiest month (with the highest average wind speed) is November (9.7km/h).
The calmest month (with the lowest average wind speed) is September (7.4km/h).

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Average humidity
Boston, Costa Rica

Average humidity - Boston, Costa Rica

Months with the highest relative humidity are May and June (74%).
The month with the lowest relative humidity is September (71%).

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Average rainfall
Boston, Costa Rica

Average rainfall - Boston, Costa Rica

The wettest month (with the highest rainfall) is July (203mm).
The driest month (with the least rainfall) is April (65mm).

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Average rainfall days
Boston, Costa Rica

Average rainfall days - Boston, Costa Rica

The month with the highest number of rainy days is July (25.8 days).
The month with the least rainy days is February (15.7 days).

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Average daylight / Average sunshine
Boston, Costa Rica

Average daylight / Average sunshine - Boston, Costa Rica

The month with the longest days is June (Average daylight: 12.7h).
The month with the shortest days is December (Average daylight: 11.5h).

The month with the most sunshine is September (Average sunshine: 9.2h).
The month with the least sunshine is December (Average sunshine: 7.3h).

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Average sunshine days
Boston, Costa Rica

Average sunshine days - Boston, Costa Rica

The month with the most sunshine days is January (10.6 days).
The month with the least sunshine days is July (3.2 days).

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Average UV index
Boston, Costa Rica

Average UV index - Boston, Costa Rica

Months with the highest UV index are March, April, May, June, July, August, September, October and November (UV index 7).
Months with the lowest UV index are January, February and December (UV index 6).

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Average visibility
Boston, Costa Rica

Average visibility - Boston, Costa Rica

Months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).

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