Tanzania has a national meteorological authority. It names the country's seasons, dates them, and forecasts them in advance. Here is what it publishes about the Kilimanjaro region, before anybody's recommended-month list.

Masika and Vuli, the two seasons with names

The Tanzania Meteorological Authority defines two rainy seasons for the parts of the country that get two: "the long rains (Masika), which typically begin in March and continue through May (MAM), and the short rains (Vuli), which start in October and last through December (OND)". It places Kilimanjaro in that group by name, listing the "northeastern highlands (Kilimanjaro, Arusha, Manyara)" among the regions concerned.

The dry stretch, in the authority's own sentence

On dry months the authority is explicit, and its scope is the whole country: "However, January and February are relatively dry for areas with a bimodal rainfall regime, while June through September are dry months for the entire country."

This Vuli has a dated forecast, and it is not generic

The authority's outlook for Vuli October to December 2026, document reference 727J - 04/2026, names the region: "The Vuli rainfall season is specific to areas of the north-eastern highlands (Arusha, Manyara and Kilimanjaro regions)". It states the season "is more likely to be influenced by Very Strong El-Nino conditions". It forecasts rains "Above Normal to Normal" over most parts of the north-eastern highlands and three other regions. It states that "Enhanced rainfall is expected during the month of November, 2026", that the rains are expected to start in the fourth week of September and first week of October over Lake Victoria and to spread gradually to other areas during October, and that off-seasonal rains are expected to continue in January 2027. The outlook lists "Tourism and Wildlife" among the sectors it advises, and says nothing about climbing conditions on the mountain.

What the authority measured at Moshi

Moshi is the town at the foot of the mountain. For the MAM season of 2025 the authority reports Moshi among the stations that observed higher cumulative rainfall than the MAM long-term average, that average taken over the reference period 1991 to 2020. For OND 2025 it reports Moshi among the stations that observed near-average rainfall. It also records that in February 2025, Kilimanjaro and Moshi each recorded 11 extreme hot days by maximum temperature. And it records what the long rains can do down the hill: "In Moshi District, continuous rains on 5th April flooded over 300 houses and 2,000 acres".

What the official sources served, and did not, on climbing weather

The WMO World Weather Information Service city list was fetched on 2026-09-26 and carries no entry for Moshi, Kilimanjaro or Arusha, so no monthly normals table for the area was obtainable from it. The met authority's own Masika publications category returned an empty document listing the same day. No statement about climbing conditions by season was found on any park authority, government or meteorological page fetched that day, which is a result about what those pages served. The park authority's only seasonal line on its Kilimanjaro page is "Open year-round; gates close at 6 PM".

Where the operator's own pages disagree

The operator's home page states that the mountain "can be climbed year-round, but the best conditions are during the two dry seasons", giving January to March and June to October as primary and November, December and April as shoulder months. The FAQ on that same page advises avoiding the heaviest rains of April, May and November. So November is listed both as a shoulder month and as a month to avoid, on one page read on 2026-09-26. Meanwhile the route hub's Lemosho card lists all twelve months as best months. Put that to whoever quotes you and ask which reading they stand behind.

Rain shadow, huts and crowds

The operator states that Rongai "sits in a rain shadow that gets a fraction of the rainfall of Machame or Lemosho" and calls it "the natural choice during the long rains of March, April, and May". It states that Marangu has hut accommodation, and that the western and southern routes "can be wet and difficult on the lower forest sections in those months". On crowding, its prices page carries the line "Peak season (July to September) fills first".

Where to go next

For the operator's own route-by-season reasoning, including which routes it recommends in the long rains, read the comparison page: https://gokilimanjarotreks.com/compare-routes The operator also publishes its own guide at https://gokilimanjarotreks.com/blog/best-month-to-climb-kilimanjaro.

Sources