Yes, it is easy to understand that Dutch sentence even without a translation. The words "het wordt" (it becomes), "morgen" (tomorrow), "erg warm" (very hot), and "in Nederland" (in the Netherlands) are very close to English cognates, making the meaning clear. This sentence is a typical weather forecast structure in Dutch: "Het wordt + [time] + [weather adjective] + [location]."
If you are learning Dutch, weather vocabulary is a great place to start because many words follow the same pattern as English. For example, "regen" (rain), "wind" (wind), "zon" (sun), and "koud" (cold) are almost identical. The verb "worden" (to become) is frequently used in weather predictions, similar to "will be" in English. The full sentence structure is predictable: subject (het) + verb (wordt) + time adverb (morgen) + adjective (erg warm) + location (in Nederland). Once you learn this template, you can understand and create many weather sentences.
However, be aware of some small differences. "Erg" means "very" but can also mean "bad" in other contexts; here it is intensifying the adjective. Also, Dutch often drops the article before the country name ("in Nederland" not "in het Nederland") unless it is a region or specific area. Practice with different time adverbs like "vandaag" (today), "vanavond" (this evening), or "volgende week" (next week). Swap out adjectives like "zonnig" (sunny), "bewolkt" (cloudy), or "stormachtig" (stormy) to expand your vocabulary.
To strengthen your understanding, listen to Dutch weather forecasts (available on radio or YouTube) and write down common phrases. Try to predict the weather for the next day using the same structure. This will build both your vocabulary and your confidence with the verb "worden" used in other contexts (like "Ik word blij" – I become happy). There is no need to rush; weather talk is forgiving because it is repetitive and highly contextual. Over time, you will recognize these patterns automatically, and you will no longer rely on mental translation.