Honolulu, Hawaii Weather in September

September weather

September stays warm, with daytime highs around 28°C and nights near 25°C. The humidity can make walking uphill feel sticky, but there's plenty of sunshine for Waikiki Beach, swimming and visits to Pearl Harbor. Rain falls on about 12 days, usually as passing showers rather than a reason to cancel the whole day.

Diamond Head's exposed trail can feel hot, so save the climb for cooler hours. A rainy spell is a good time to explore the Bishop Museum or browse shops in Ala Moana Center. The sea is still inviting, but check conditions before swimming; strong surf can make some beaches unsafe.

Festivals and crowds

September brings Aloha Festivals, a statewide celebration of Hawaiian culture. In Honolulu, look for the Waikiki Ho'olauleʻa, a street festival with music, hula and food stalls. Dates change each year, so check the festival schedule before you go.

Families who want quieter beach time may find September easier than the main summer or winter holiday periods. With school back in session for many visitors, Waikiki can feel less packed, and hotel rates are often lower than during peak holiday months. Labor Day weekend is an exception: expect more local visitors and busy beaches.

Getting around

September is a useful month for mixing beach days with sightseeing, without the heavier rain seen in October. For a break from the heat, take TheBus between Waikiki and the cool galleries at the Honolulu Museum of Art.

If you're planning a Diamond Head hike, reserve entry online; non-residents need reservations. This small bit of planning helps you avoid arriving at the crater entrance only to find you can't go in.