“In the summer” is the correct, standard way to refer to something happening during that season in English — as in “We travel a lot in the summer.” You’ll sometimes see people write “on the summer” or drop the article and say “in summer,” and both of those show up for different reasons, one wrong and one just a variation.
Let’s sort out when each version belongs, and why prepositions with seasons trip up even confident English speakers.
The Short Answer
Use “in” with seasons, never “on.” Summer, winter, spring, and fall all take the preposition “in” when you’re describing a general time frame:
- In the summer, the pool stays open until nine.
- In winter, days get shorter fast.
- Sales pick up in the spring.
“On” is reserved for specific days and dates — “on Monday,” “on July 4th” — not for seasons, which are broad stretches of time. That’s the core reason “on the summer” always reads as a mistake.
“In the Summer” vs. “In Summer”
Both are grammatically fine, and the difference is mostly regional and stylistic rather than a rule you’re breaking.
| Version | Where It’s Common | Feel |
|---|---|---|
| In the summer | American English, casual speech everywhere | Slightly more conversational |
| In summer | British English, formal or literary writing | Slightly more general/timeless |
“I love swimming in the summer” and “I love swimming in summer” mean the same thing. Neither is more correct — pick the one that matches your audience or just sounds right to your ear.
When to Drop the Article
You’ll also see “summer” used without any preposition at all when it’s functioning as a noun on its own, or as part of a set phrase:
- Summer is my favorite season. (subject, no preposition needed)
- This summer has been unusually mild.
- Every summer, we visit my grandparents.
Here, “summer” isn’t describing when something happens in a general sense — it’s the subject itself or paired with “this” or “every,” which already do the job an article or preposition would.
“In the Summer” vs. “During the Summer”
These two overlap a lot, but “during” leans slightly more formal and sometimes implies the whole stretch of time, start to finish, rather than just “at some point in.”
- In the summer, I read more. (a general pattern)
- During the summer, the store extends its hours. (the entire season, as a defined period)
In casual conversation, they’re interchangeable enough that you rarely need to think twice.
Examples in a Sentence
- We usually go camping in the summer.
- Ice cream sales spike in the summer.
- She was born in the summer of 2001.
- In the summer, the office switches to shorter Fridays.
- Prices for flights rise in the summer months.
Why People Get It Wrong
The confusion usually comes from mixing up how English treats time expressions. Specific points in time — days, dates, holidays — often take “on.” Longer, less fixed stretches — months, years, seasons — take “in.” Seasons feel like they could go either way because they’re tied to specific months, but grammatically they behave like broad time periods, not fixed points, so “in” wins every time.
Key Takeaways
- “In the summer” is correct; “on the summer” is not standard English.
- “In summer” (no article) is common in British and formal writing — same meaning.
- Drop the preposition entirely when “summer” is the subject or follows “this/every.”
- “During the summer” works as a slightly more formal near-synonym.
- Seasons follow the same “in” rule as months and years, not the “on” rule used for specific dates.
Frequently Asked Questions
Is it “in the summer” or “on the summer”?
It’s always “in the summer.” “On” is used for specific days and dates, not for seasons, which cover a broad span of time.
Can I say “in summer” without “the”?
Yes. “In summer” is common, especially in British English and formal writing. It means the same thing as “in the summer.”
Is “during the summer” the same as “in the summer”?
Almost always, yes. “During” can suggest the entire season as a block of time, while “in” is more general, but in everyday use they’re interchangeable.
Why don’t seasons take “on” like days do?
“On” pairs with specific, fixed points in time such as dates and days of the week. Seasons are longer, looser periods, so English treats them like months and years, which take “in.”
Is “summer” capitalized after “in the”?
No. Seasons are common nouns in English and aren’t capitalized unless they start a sentence or appear in a title.
Small preposition, easy fix once you see the pattern. If prepositions like this one keep catching you off guard, it’s worth browsing a few more usage guides here to build that instinct for good.
