Home
Weather Dublin
WeatherRadar
RainfallRadar
TemperatureRadar
WindRadar
LightningRadar
Weather News
Editor's Pick
Discover the app
Weather widget
Contact us
Apps
    Home / Editor's Pick /

    September astro outlook: Fourth supermoon and Neptune appears

15:00
2 September 2023

September astro outlook
Fourth supermoon and Neptune appears

star-gazing

September is not the most active month for stargazers, but it does deliver the autumn equinox, ushering in the new season.

The month begins with a new moon on September 15 offering dark skies perfect for those wanting to see fainter objects in the night sky.

Those faint objects will include Neptune in opposition on September 19, though only for those with powerful telescopes.

The furthest planet from the sun will be illuminated by the star on this day, offering the best chance to spot the gas giant.

A few days later, we find Mercury at its greatest western elongation. On September 22, the closest planet to the sun will be visible in the UK and Ireland. Look towards the eastern horizon before sunrise.

A day later, and the autumnal equinox heralds the beginning of astronomical autumn. This year, the equinox takes place on September 23, at 07:50 am BST.

At the equinox the sun will shine directly on the equator, giving us an almost equal number of hours of day and night. In the Southern Hemisphere, this is the spring equinox.

Finally, the month is rounded out by the year's fourth, and final, supermoon. Rising on the evening of September 29, this full moon is dubbed the harvest, or corn, moon.

The closest full moon to the equinox is always referred to as the harvest moon. This year it becomes a supermoon as it arrives in parallel with the moon's perigee, the closest point to Earth in its orbit.

If you head out to capture the supermoon, have a telescope powerful enough to spot Neptune, or use the darkness of the new moon for a spot of stargazing... we would love to see what you capture.

Tap the image icon in the app or use our dedicated uploader.

Tips: Astrophotography with your phoneread more
Ryan Hathaway
More on the topic
Thunderstorm risk to start the week. Popcorn storms. . . Tuesday 9 June 2026
Weather warning map showing a yellow thunderstorm alert area extending from northeast Scotland through eastern England to the southeast, with lightning symbols and a large warning triangle highlighting storm risk.
Tuesday 9 June 2026

Popcorn storms

Thunderstorm risk to start the week
Final thunderstorms hanging around. Before Thursday downpour. . . Wednesday 10 June 2026
Split weather graphic showing thunderstorms and lightning activity across southeast England on the left, and a broad rain band moving east across Ireland and western UK on the right, with rain icon and a movement arrow east.
Wednesday 10 June 2026

Before Thursday downpour

Final thunderstorms hanging around
Heat is heading for Central Europe. Above 30 degrees. . . Friday 12 June 2026
On the left, a weather map showing the highest temperatures in Europe. On the right, a thermometer against a blue sky
Friday 12 June 2026

Above 30 degrees

Heat is heading for Central Europe
All weather news
This might also interest you
Turbulent weather in the Canary Islands. Storm and rain. . . Friday 12 December 2025
Weather graphic showing rain and wind fields over the Canary Islands and a central warning symbol.
Friday 12 December 2025

Storm and rain

Turbulent weather in the Canary Islands
Wishes from Weather & Radar. Merry Christmas!. . . Thursday 25 December 2025
Outline of Santa Claus with a yellow and white hat, "Ho-Ho-Ho" next to the outline above a Christmas tree.
Thursday 25 December 2025

Merry Christmas!

Wishes from Weather & Radar
Happy New Year. Hello 2026. . . Wednesday 31 December 2025
Illustration of white and yellow fireworks on a blue background.
Wednesday 31 December 2025

Hello 2026

Happy New Year
All articles
Weather & Radar

Weather & Radar is also available on

Google Play StoreApp Store

Company

Contact us Privacy Policy Legal info Accessibility statement

Services

Uploader

Socials

facebooktwitteryouTubelinkList