January to mid-March: warm, dry conditions and fewer climbers
June to October: the most popular window, with clear skies and stable weather
Rainy seasons (roughly April to May and November) are possible but wetter, muddier and colder higher up. Summit night is cold in every season, so pack accordingly.
Mount Meru is climbed via a single main route, using mountain huts rather than tents:
The dry seasons offer the clearest views and easiest trekking conditions:
The wetter months (April, May and November) bring more rain and cloud cover, which can obscure the summit views.
Not included (typical): international flights, visas, insurance, personal gear and tips for the crew.
Mount Meru works well alongside your other Tanzania plans: