September weather forecast
Grecia, Costa Rica

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Weather in September

By September the weather trend establishes persistence as rainfall peaks once again at 288mm (11.34"). Although temperatures show minimal variation, a minute increase in average wind speed to 3.8km/h (2.4mph) is indicative of the incoming seasonal change. The weather invites indoor plans and activities due to the intensified cloud coverage. Even though Grecia continues to experience high humidity and frequent rains, the people embrace the serene beauty brought forth by the monsoon.

Temperature

Grecia's average high-temperature in September is a still warm 26.3°C (79.3°F), marking an insignificant difference from the 26.7°C (80.1°F) of August. Grecia in September anticipates an average nighttime temperature of 19.2°C (66.6°F).

Humidity

The average relative humidity in September in Grecia, Costa Rica, is 87%.

Rainfall

In September, the rain falls for 29.4 days. Throughout September, 288mm (11.34") of precipitation is accumulated. In Grecia, during the entire year, the rain falls for 272 days and collects up to 2217mm (87.28") of precipitation.

Daylight

The average length of the day in September is 12h and 11min.
On the first day of September, sunrise is at 05:27 and sunset at 17:46. On the last day of the month, sunrise is at 05:25 and sunset at 17:28 CST.

Sunshine

In Grecia, the average sunshine in September is 7.6h.

UV index

The months with the highest UV index in Grecia are January through April, June, July, September, October and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A typical high UV index of 6 in September suggests the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.

Frequently asked questions

What are the temperatures in Grecia in September?

In September, the average high-temperature and low-temperature in Grecia are 26.3°C (79.3°F) and 19.2°C (66.6°F) respectively. The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in May is evaluated at 32°C (89.6°F).

What is the average humidity in September in Grecia?

In September, the average relative humidity in Grecia is 87%.

How many days does it rain in September in Grecia?

In Grecia, in September, it is raining for 29.4 days, with typically 288mm (11.34") of accumulated precipitation.

What is the average length of the day in September in Grecia?

The average day length in September is 12h and 11min.

What time are sunrise and sunset in September in Grecia?

In September, on the first day of the month, sunrise is at 05:27 and sunset at 17:46. On the last day of the month, in Grecia, Costa Rica, sunrise is at 05:25 and sunset at 17:28 CST.

How long on average sun shines in September in Grecia?

In September, the average sunshine duration in Grecia, Costa Rica, is 7.6h.

What are the months with the highest UV index in Grecia?

The months with the highest UV index are January through April, June, July, September, October and December, with an average maximum UV index of 6.

What is the UV index intensity in September in Grecia?

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Grecia, Costa Rica

Average temperature in September - Grecia, Costa Rica
  • Average high temperature in September: 26.3°C

The warmest months (with the highest average high temperature) are March and April (29.7°C).
The month with the lowest average high temperature is October (25.4°C).

  • Average low temperature in September: 19.2°C

The month with the highest average low temperature is May (19.8°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).

Average pressure in September
Grecia, Costa Rica

Average pressure in September - Grecia, Costa Rica
  • Average pressure in September: 1011mbar

The month with the highest atmospheric pressure is January (1012.1mbar).
The month with the lowest atmospheric pressure is October (1010.7mbar).

Average wind speed in September
Grecia, Costa Rica

Average wind speed in September - Grecia, Costa Rica
  • Average wind speed in September: 3.8km/h

The windiest month (with the highest average wind speed) is February (10.6km/h).
The calmest month (with the lowest average wind speed) is September (3.8km/h).

Average humidity in September
Grecia, Costa Rica

Average humidity in September - Grecia, Costa Rica
  • Average humidity in September: 87%

The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).

Average rainfall in September
Grecia, Costa Rica

Average rainfall in September - Grecia, Costa Rica
  • Average rainfall in September: 288mm

The wettest month (with the highest rainfall) is October (396mm).
The driest month (with the least rainfall) is February (17mm).

Average rainfall days in September
Grecia, Costa Rica

Average rainfall days in September - Grecia, Costa Rica
  • Average rainfall days in September: 29.4 days

The month with the highest number of rainy days is October (30.2 days).
The month with the least rainy days is February (10.3 days).

Average daylight in September /
Average sunshine in September
Grecia, Costa Rica

Average daylight in September / Average sunshine in September - Grecia, Costa Rica
  • Average daylight in September: 12h and 1min

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).

  • Average sunshine in September: 7h and 4min

The month with the most sunshine is March (Average sunshine: 9h and 24min).
The month with the least sunshine is October (Average sunshine: 7h and 0min).

Average sunshine days in September
Grecia, Costa Rica

Average sunshine days in September - Grecia, Costa Rica
  • Average sunshine days in September: 0.5 days

The month with the most sunshine days is January (16.7 days).
The month with the least sunshine days is September (0.5 days).

Average UV index in September
Grecia, Costa Rica

Average UV index in September - Grecia, Costa Rica
  • Average UV index in September: 6

The months with the highest UV index are January, February, March, April, June, July, September, October and December (UV index 6).
The months with the lowest UV index are May, August and November (UV index 5).

Average cloud cover in September
Grecia, Costa Rica

Average cloud cover in September - Grecia, Costa Rica
  • Average cloud cover in September: 50

The month with the most cloud cover is October (Cloud cover 54).
The month with the least cloud cover is February (Cloud cover 19).

Average visibility in September
Grecia, Costa Rica

Average visibility in September - Grecia, Costa Rica
  • Average visibility in September: 7km

The months with the highest visibility are February and March (10km).
The months with the lowest visibility are August, September, October and November (7km).

Grecia, Costa Rica

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