Liepaja is a safe place. Some people think it is not safe at night, but it is all a matter of personal opinion. Avoid walking alone in darkness. Do not leave your belongings unattended in clubs and pubs, or on the streets. Be careful in Karosta - during the 1990s it was a criminal place; however, it is much better now.
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Latvia is Nordic in its weather. The temperatures in July can reach 30ºC 86ºF. And they can also fall as low as -30ºC -22ºF in January... But both winter and summer has their beauty. Make two visits - one in summer, one in winter - and you will have two totally different experiences! And make yet another visit in mid October, when all the trees are colorful.