Temperatures begin to decline slowly from August extremes, though still hot during daytime. Coastal humidity may remain noticeable; evenings become more comfortable by mid-month.
Average daily low and high (°C) and monthly rainfall. The badge shows how it feels, allowing for humidity.
Average temperature across Oman in September.
Muscat, Sohar, Barka
Late-summer in September begins a gentle easing: humidity wanes, and daytime highs fall back into the low-to-mid 30s°C, making sightseeing more tolerable. The sea remains warm and favorable for boat trips, and weekend road trips to Quriyat or Barka feel less punishing. Keep a light jumper for coastal evenings which can be breezy.
Khasab, Dibba, fjords & dhow cruises
September starts to cool a touch and the sea remains warm and calm enough for extended snorkeling; daytime highs often fall back into the high 20s°C. The shoulder season reduces day-trip congestion and overwater visibility is typically good. Plan longer excursions into the fjords and bring layered clothing for cooler dawns.
Jebel Akhdar, Jebel Shams, Nizwa
September afternoons in the Hajar begin to moderate, especially at elevation where daytime highs slip back into the low 20s°C and trekking conditions improve. Wadi pools can still retain warm water from summer and are good for a post-hike dip; some remote tracks reopen after summer maintenance. Bring a light jacket for shady gorges where wind funnels and cools the air.
Sharqiyah Sands, desert wadis, Ras al Hadd approaches
September mornings are noticeably cooler and the desert becomes more bearable for day trips; highs often slip into the low 30s°C and evenings turn comfortably warm. Wadi pools may still be warm enough for a dip in sheltered spots and the season’s first storms can occur later in the month. Resume longer drives but remain mindful of flash-flood risk in narrow wadis.
Salalah, Mirbat, khareef monsoon coast
Khareef tapering in September leaves lingering mist and green hillsides early in the month, with conditions gradually drying and warming toward the end of the month. Waterfalls and seasonal pools remain active, and roads into the hinterland can be muddy. Bring layered clothing for changeable conditions and book accommodation in Salalah early if visiting the tail end of the khareef.
There are no major festivals or events in Oman during September to be aware of.
See how September compares with the rest of the year, then read the full guide.