Kilimanjaro Weather: Month by Month

Weather is the most common reason climbers give for not summiting — not altitude sickness, not fitness, but weather. A whiteout at Barafu Camp can turn summit night into a navigation emergency. Heavy rain in the rainforest zone makes the Barranco Wall significantly more hazardous. Understanding what the mountain holds month by month is not optional preparation — it is the foundation of every good climb plan.

January & February — The Short Dry Season

January and February represent the finest weather conditions on Kilimanjaro. The long rains ended in late May; the short rains (November) are typically finished by early December. The mountain is dry, the summit is clearly visible from base camp in the mornings, and the trails — though dusty in the lower sections — are in good condition.

The trade-off is that January–February are the coldest months at the summit. Night temperatures at Barafu Camp (4,600m) drop to -15°C to -20°C; on summit night, wind chill can push effective temperature to -30°C or below. Climbers who summit in January or February report that the cold is the most underestimated aspect of the experience — not the altitude, not the distance, the cold.

What makes January–February special

The summit views in January–February are the clearest of any month. The atmosphere is at its least humid, and the alpine desert zone above 4,000m is often snow-free aside from the permanent glaciers. If you want photographs of Uhuru Peak with the Tanzanian plains visible in the background, this is the month.

March, April & May — The Long Rainy Season

April and May are objectively the worst months to climb Kilimanjaro, and the data is unambiguous. April receives 200–300mm of rainfall — roughly equivalent to the total monthly rainfall of London. The rainforest sections of every route become rivers of mud. The Barranco Wall on Machame becomes genuinely hazardous — the rock is slick, footholds are unreliable, and a slip at the wrong moment is a serious fall risk.

Summit success rates drop to 65–75% in April, primarily because the weather conditions add a compounding difficulty to an already demanding physical challenge. But it is not impossible — some operators run climbs year-round, and with the right preparation and a strong team, a rainy-season climb is manageable. The upside: these months have the fewest climbers on the mountain, and permit availability is not an issue.

Honest assessment for April–May climbs

If you are climbing in April or May, budget extra days for weather delays — a rest day at Barranco Camp or Karanga Camp is more likely in the rainy season. Choose the Lemosho route over Machame for better trail conditions in the moorland zone. Be prepared for cloud cover to obscure summit views entirely. The mountain does not care about your photos.

June, July & August — Peak Season

June through August is the main peak season on Kilimanjaro — the dry season coincides with northern hemisphere summer holidays, and the majority of annual climbers attempt the mountain during these three months. The weather is reliable: minimal rainfall, dry trails, clear summit mornings. Success rates are high — 91–93% across operators.

The main disadvantage is crowding. The routes — particularly Machame, which handles the most climbers — can feel busy. At popular camps like Barranco and Barafu, you may share the site with multiple other groups. This is not just an aesthetic issue: noise, light pollution from other camps, and queueing at popular sections (the Barranco Wall is narrow) affect the experience of the climb. The summit at dawn in August can feel more like a city park than a wilderness.

July–August summit temperature reality

July and August have the coldest summit temperatures of any month — typically -22°C to -30°C on summit night. This is not a reason to avoid these months, but it is a reason to invest in proper summit gear. A four-season sleeping bag rated to -30°C is not over-prepared for a July or August summit push.

September & October — The Short Dry Season

September and October — often called the "second peak season" — offer a compelling combination of good weather and reduced crowding. The short dry season between the long rains (March–May) and the main dry season (June–August) brings stable conditions, minimal cloud cover, and a mountain that is noticeably quieter than the June–August peak.

Summit temperatures in September and October are the mildest of any dry month — around -14°C to -16°C at dawn on the summit. This matters more than it sounds: at -14°C versus -25°C, your water bottle is less likely to freeze, your down jacket is less likely to fail at a critical seam, and your fingers are more likely to retain enough dexterity to operate your camera or phone at the summit.

Mount Kilimanjaro Climb assessment

September and October are consistently our most recommended months for experienced climbers who want the best combination of weather reliability, summit conditions, and relative solitude. October in particular has a quality that August lacks: the mountain feels like wilderness, not a pilgrimage route.

December — Holiday Window

December occupies a middle position: the short rains have usually ended by early December, so conditions are generally dry. The Christmas–New Year period brings a significant increase in climbers — the same holiday effect as July–August — but the season is short enough that crowding is less sustained than the main peak.

December is a popular choice for climbers with rigid holiday schedules. The weather is reliable enough, and the combination of a year-end summit with the celebrations at Uhuru Peak (guides and porters mark the moment with particular enthusiasm at New Year) creates a distinctive atmosphere on the mountain.