Lunar Calendar Month September 2025 (Costa Rica)

The Moon is the only natural satellite of the Earth and the fifth largest moon in the Solar System. It is the largest natural satellite in the solar system relative to the size of its planet. The following is information specific for San José, Costa Rica during September 2025.

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Date and time of moon phases

The information in the following table comes from calculations published by the Astronomical Applications Department of the U.S. Naval Observatory.

Moon phases	Dates	Time
full moon	2025-09-07	12:09
3rd quarter	2025-09-14	04:33
new moon	2025-09-21	13:54
1st quarter	2025-09-29	17:54

Apogee and perigee of the Moon

The following table shows the dates of perigee and apogee of the Moon during September 2025.

Position	Dates	Time	Distance	Notes
Perigee	2025-09-10	06:11	364,780 km
Apogee	2025-09-26	03:47	405,551 km

Eclipses in September 2025

The following is information about eclipses occuring worldwide during September 2025. The eclipses listed here may be totally visible, partly visible or not visible in any part of Costa Rica.

Type	Dates	Saros	Notes
solar eclipse	2025-09-21	154
lunar eclipse	2025-09-07	128

Moon-Planet Conjunctions

A Moon-planet conjunction occurs when an astronomical object has either the same, or nearly the same, right ascension or the same ecliptic longitude of that of the Moon, as observed from Earth.

Astronomical Objects	Date and Time
Saturn	2025-09-08 14:09
Pleiades	2025-09-12 15:48
Jupiter	2025-09-16 05:06
Pollux	2025-09-16 11:58
Beehive	2025-09-17 11:24
Regulus	2025-09-19 05:11
Venus	2025-09-19 05:46
Spica	2025-09-23 15:31
Mars	2025-09-24 08:50
Antares	2025-09-27 11:34

Illumination of the Moon

The following table depicts the illumination of the Moon, calculated at 00:00, throughtout the 30 days of September 2025.

September 2025
w	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Week 36	1Monday 59.5% illuminated Age: 8.3	2Tuesday 68.8% illuminated Age: 9.2	3Wednesday 77.7% illuminated Age: 10.1	4Thursday 85.6% illuminated Age: 11.1	5Friday 92.2% illuminated Age: 12.1	6Saturday 97.1% illuminated Age: 13.1	7Sunday 99.7% illuminated Age: 14.2
Week 37	8Monday 99.7% illuminated Age: 15.3	9Tuesday 96.9% illuminated Age: 16.4	10Wednesday 91.5% illuminated Age: 17.5	11Thursday 83.8% illuminated Age: 18.7	12Friday 74.3% illuminated Age: 19.8	13Saturday 63.5% illuminated Age: 20.9	14Sunday 52.2% illuminated Age: 21.9
Week 38	15Monday 41% illuminated Age: 23	16Tuesday 30.4% illuminated Age: 24	17Wednesday 21% illuminated Age: 25.1	18Thursday 13% illuminated Age: 26.1	19Friday 6.8% illuminated Age: 27.1	20Saturday 2.5% illuminated Age: 28	21Sunday 0.3% illuminated Age: 29
Week 39	22Monday 0.2% illuminated Age: 0.4	23Tuesday 2% illuminated Age: 1.3	24Wednesday 5.6% illuminated Age: 2.2	25Thursday 10.7% illuminated Age: 3.1	26Friday 17.3% illuminated Age: 4	27Saturday 25% illuminated Age: 4.9	28Sunday 33.6% illuminated Age: 5.8
Week 40	29Monday 42.9% illuminated Age: 6.7	30Tuesday 52.6% illuminated Age: 7.6	1 Wednesday	2 Thursday	3 Friday	4 Saturday	5 Sunday
	6 Monday	7 Tuesday	8 Wednesday	9 Thursday	10 Friday	11 Saturday	12 Sunday
	13 Monday	14 Tuesday	15 Wednesday	16 Thursday	17 Friday	18 Saturday	19 Sunday