Home / Editor's Pick /

Summer solstice: Longest day of the year is here

07:00
21 June 2025

Summer solstice
Longest day of the year is here

summer solstice© Shutterstock

Today we mark the summer solstice, the longest day of the year, signalling the start of astronomical summer.

A solstice occurs when one of Earth’s pole reaches its maximum tilt towards the Sun. For those of us in the Northern Hemisphere, it will be the longest of the year, but for those in the Southern Hemisphere, it’s the opposite.

On the summer solstice, the sun travels its longest path after rising, reaching its northernmost point. The precise time of the summer solstice on June 21st is at 03:42 am.

The summer solstice is over 9 hours longer in daylight length than the winter solstice! Make sure you make the most of the additional daylight!

Hottest solstice ever?

In the midst of a heatwave, temperatures are expected to reach up to 33°C. The hottest solstice on record was in 2017 with a high of 34.5°C.

The sun is also at its strongest on the solstice, which means you need to take extra precaution in the sun, especially as the UV Index is forecast to reach high levels across some parts of England and Wales.

Check out the UV Index hereread more

While meteorological summer began on June 1st, and will last until August 31st, astronomical summer relies on the tilt of the Earth and its rotational axis, which will end on September 22nd, when the autumn equinox then occurs.

Ryan Hathaway
More on the topic
Northern Lights over Dublin, Ireland
Wednesday 12 November 2025

Remaining active

Fascinating Northern Lights in the sky
Weather map of the UK and Ireland showing temperatures between 15°C and 17°C in major cities like London, Cardiff, Dublin, and Aberdeen, with an icon of a red thermometer on the left.
Thursday 6 November 2025

Unseasonable warmth

Mild autumn temperatures continue
The weather map shows a tropical cyclone over the Philippines with its centre east of Manila.
Monday 10 November 2025

Super Typhoon Fung-wong

Philippines hit by second typhoon
All weather news
This might also interest you
Sunday 17 August 2025

Your weather - Your shots

Summer shots from a warm week
Sunday 24 August 2025

Your weather - Your shots

Mammatus clouds widely spotted
Wednesday 27 August 2025

Breakfast brief

Frontal system brings heavy rain
All articles
Weather & Radar

www.weatherandradar.ie

facebooktwitteryouTubeContact uslinkList
Privacy Policy | Legal info | Accessibility statement