Tempestas hodie ventosior est quam heri, itaque nautae in portu manent.

Ventosior is the comparative form of the adjective ventosus, -a, -um, meaning windy.

So the pattern is:

• ventosus = windy
• ventosior = windier
• ventosissimus = windiest

In this sentence, ventosior agrees with tempestas (storm/weather) in number and case: both are nominative singular.

A detail that often surprises learners: in the comparative, the masculine and feminine nominative singular have the same form, -ior. So even though tempestas is feminine, ventosior is exactly the form you would expect.

Not necessarily. Latin often leaves out words that are easy to understand from context.

Quam means than, and heri means yesterday. So ventosior est quam heri literally means something like:

• it is windier than yesterday

In fuller English, we might say:

• it is windier than it was yesterday
• today’s weather is windier than yesterday’s

Latin does not need to repeat tempestas or est here, because the comparison is already clear.

Tempestas is the subject of the first clause. It is nominative singular.

Depending on context, tempestas can mean:

• weather
• storm
• season
• sometimes more figuratively, a troubled time

In this sentence, it most naturally refers to the weather/stormy conditions.

So grammatically:

• tempestas = subject
• ventosior est = is windier

Yes, hodie could go in other places. Latin word order is much more flexible than English word order.

Here:

• Tempestas hodie ventosior est quam heri

puts tempestas first, then hodie.

But Latin could also say things like:

• Hodie tempestas ventosior est quam heri
• Tempestas ventosior hodie est quam heri

with only small shifts in emphasis.

Hodie is an adverb meaning today, so it does not have to agree with any noun. It simply modifies the idea of the whole statement.

Because nautae is nominative plural here.

The noun is:

• nauta, nautae = sailor

This is a first-declension noun, but it is masculine in meaning. That can feel unusual to English speakers, because many first-declension nouns are feminine, but some nouns referring to male people are first declension.

Here the forms are:

• nauta = sailor (singular subject)
• nautae = sailors (plural subject)

Since the verb is manent (they remain/stay), the plural subject nautae fits perfectly.

Because Latin uses different cases after in depending on whether you mean location or motion.

• in + ablative = in / on / at a place
• in + accusative = into a place

So:

• in portu = in the harbor / at the harbor → location
• in portum = into the harbor → motion toward

Since the sailors are staying/remain there, not moving into it, Latin uses the ablative:

• in portu

Portu is ablative singular of portus, -us, meaning harbor/port.

This is a fourth-declension noun. Its ablative singular often ends in -u:

• portus = harbor (nominative singular)
• portum = harbor (accusative singular)
• portu = in/by/at the harbor (ablative singular)

So in portu is a very standard Latin phrase meaning in the harbor or at the port.

Itaque means and so, therefore, or thus.

It connects the two ideas:

• the weather is windier today than yesterday
• therefore the sailors stay in the harbor

So it introduces the result or conclusion.

It is slightly stronger and more logical than just et (and). It tells you not just that the second clause happens, but that it follows from the first one.

Because manere means to remain, to stay, or to stay put. That is more specific than just to be.

• sunt in portu would mean they are in the harbor
• manent in portu means they remain/stay in the harbor

So manent emphasizes that the sailors are not leaving because of the weather.

Grammatically, manent is:

• present tense
• third person plural
• from maneo, manere

Because Latin has no articles like English the or a/an.

So:

• nautae can mean sailors or the sailors
• portu can mean a harbor, the harbor, or harbor, depending on context

Latin relies on context rather than articles. In this sentence, English naturally uses the sailors and the harbor, but Latin does not need separate words for that.

Latin could rearrange it quite a bit, because the grammar is mostly shown by the word endings rather than by position.

For example, these would still be understandable Latin:

• Hodie tempestas ventosior est quam heri, itaque nautae in portu manent.
• Nautae itaque in portu manent, quod tempestas hodie ventosior est quam heri.

The exact order used here is natural and clear:

• first, the weather statement
• then, the consequence
• then, the sailors and where they stay

So the word order helps with emphasis and flow, but the endings carry most of the grammatical information.

Because Latin often prefers a more compact comparison when the missing idea is obvious.

Heri is simply the adverb yesterday. In a comparative sentence, Latin can use it by itself after quam:

• ventosior quam heri = windier than yesterday

This is idiomatic Latin. The listener naturally understands something like:

• than it was yesterday
• than yesterday’s weather

Latin frequently avoids repeating words when they can be understood easily.

Yes. In this sentence, tempestas is a single thing grammatically, so the verb is singular:

• tempestas ... est

English also usually treats weather as singular:

• the weather is windy

So there is no mismatch here. The second clause changes to plural because the subject changes:

• nautae ... manent = the sailors remain

Yes, it could, depending on the teaching context and the translation you were given.

Latin tempestas has a wider range than a single English word. It can refer to:

• weather
• storm
• bad weather
• sometimes even season or time

Because the sentence mentions sailors staying in the harbor, either the weather or the storm makes sense. If your provided translation uses one of those, that is probably the intended nuance.

Because it appears with a comparative adjective, ventosior.

A very common Latin pattern is:

• comparative adjective/adverb + quam + second term of comparison

For example:

• altior quam = taller than
• celerior quam = faster than
• ventosior quam = windier than

So as soon as you see ventosior ... quam, you should expect a comparison: windier than ...

It has two main clauses joined by itaque:

1. Tempestas hodie ventosior est quam heri

   • tempestas = subject
   • hodie = adverb
   • ventosior = predicate adjective
   • est = verb
   • quam heri = comparison

2. itaque nautae in portu manent

   • itaque = therefore/and so
   • nautae = subject
   • in portu = prepositional phrase
   • manent = verb

So the logic is:

• Today the weather is windier than yesterday, therefore the sailors stay in the harbor.