Rabbi Dovid Heber just sent the following to his Kehilla:

Baltimore, MD - Sept. 27, 2023 - Tonight may be the only possible night to recite Kiddush Levana this month. In Baltimore, one may recite Kiddush Levana tonight after 7:45 p.m. (tzeis hakochavim). The moon will set at 4:31 a.m.  The National Weather Service is forecasting partly cloudy skies so if it is cloudy, keep checking for a clearly visible moon. They are forecasting the least cloud cover between 9:00 p.m. and 11:00 p.m.

While ideally Kiddush Levana should be recited “b’rov am” (according to the Chaye Adam that means reciting it with at least two other people), Kiddush Levana may be recited alone. So, given a possibly “very small window” of time, depending on the circumstance and how clear it is, it may be advisable to go outside and say it alone as soon as you see a clear moon – even before you daven Maariv.

The last night to l’chatichila recite Kiddush Levana is tomorrow (Thursday night). B’shaas hadchak one may recite it on Friday night (until 11:28 p.m.), however the National Weather Service is forecasting for both nights mostly cloudy skies (and a chance of showers).