Sure I'll be happy to explain!
Hebrew is read right-to-left and is a Semitic language, a different language group than English. Therefore the origins of the words are usually different, as well as the base grammar.

1. **Shalom** (שָׁלוֹם) - Shalom translates to *Hello* in this context, but literally means *Peace*. It is derived from the Semitic root **šalām-* which translates to intact, safe, whole, at peace. Its earliest form is in the name of the Ugarit god, Shalim. Similarly, the Ugaritic 𐎌𐎍𐎎, Phoenician 𐤔𐤋𐤌, and Aramaic שְׁלָמָא.
2. **Ha-Yom** (הַיּוֹם) - Hayom translates to *today*. The word היום has two components, *ה* (ha) and *יום* (yom). The prefix *ה* in Hebrew is a morpheme pronounced phonetically as *Huh* and translated to the English word *the*. While *Yom* translates to Day. Derived from the proto-semitic root **yawm*, similarly the Akkadian 𒌓 (ūmum), Phoenician 𐤉𐤌 (ym) and Aramaic יַוְמָא (yawmā).
3. **Yom** (יוֹם) - Yom translates to *day* literally as above, but semantically in this sentence *היום יום* translates to *Today (is a) day (that is)*, and it refers to the yet to be introduced adjective *sunny*. Yom is repeating in this sentence, and has the same etymology as described above.
4. **Shimshi** (שִׁמְשִׁי) - Shimshi translates to *sunny*. It is derived from the proto-semitic root *śamš-* which means sun, similarly the Akkadian 𒌓 (šamšum), Phoenician: 𐤔𐤌𐤔 (šmš). Also can be seen in the Mesopotamian sun god *Shamash*.

Due to differences in sentence construction between English and Hebrew, the overall grammar of the sentence roughly translates to *Hello, Today (is a) day (that is) sunny*.
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