der Juni
June
The sixth month of the year in the Gregorian calendar, between May and July.
Der Sommer beginnt offiziell im Juni.
Summer officially begins in June.

June
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June
The sixth month of the year in the Gregorian calendar, between May and July.
Der Sommer beginnt offiziell im Juni.
Summer officially begins in June.

For months like 'Juni' (June), you use the preposition 'in', which merges with the article to form 'im'. When talking about a specific day in the month, you use 'am'.
Im Juni fangen die Sommerferien an.
In June, the summer vacation starts.
To indicate an approximate point in time within the month, the combinations 'Anfang Juni' (early June), 'Mitte Juni' (mid-June), and 'Ende Juni' (late June) are often used.
Ich habe Mitte Juni einen wichtigen Termin.
I have an important appointment in mid-June.
Although the word has the article 'der', this is often replaced in a sentence by the preposition 'im'. The article 'der' is mainly used when the month is the subject of the sentence.
Der Juni dieses Jahres war sehr verregnet.
June of this year was very rainy.
July
'der Juni' and 'der Juli' are two months that come directly after each other. 'Der Juni' is the sixth month and comes after May. 'Der Juli' is the seventh month and comes after June. They are easy to confuse because the names look very similar and both begin with 'Ju-'. The order is important: first Juni, then Juli. For appointments and dates, you should therefore pay especially close attention to the ending.

Meine Freundin beginnt den neuen Kurs im Juni.
My friend starts the new course in June.
Im Juli nehmen wir zwei Wochen Urlaub.
In July, we are taking two weeks of vacation.