The best times of year to climb Kilimanjaro for the weather (avoiding rain) are January to early March and July to mid-October. There’s a long, dry winter and a green season with two rainy periods at each end. December, January, February and March are the warmest months, with clear mornings and evenings, and clouds building during the day that occlude the summit in the early afternoon hours. The predictable patterns of weather make it a good time to climb.
The main rainy season lasts from the beginning of April to early June. At this time, dense cloud formations massed over the mountain reduce visibility, and you can expect frequent snowstorms on the summit and heavy rains on the lower slopes.
The longest and driest season runs from mid-June to mid-October. During this time it can be very cold at night. During Kilimanjaro’s “winter,” there is a persistent dripping belt of clouds girdling the whole mountain above the forests and the moorland contour, leaving the summit and a few other distant peaks poking through. Above the clouds, it is usually clear and dry, and this is one of the best times to plan the trek.
In late October, the clouds finally give way to rain, and until the middle of December, the mountain is often shrouded in heavy clouds, with persistent showers from base to summit.
The best months to climb Kilimanjaro are January, February, July, August and September.
Avoid climbing during the April-May heavy rain season, and November (the short rains) if you can. During these times, in order to stay out of the ‘crowds’, it’s best to avoid the Machame Route, and on any route; avoid starting your climb on a Saturday or Sunday (the majority of groups start on these days). Regarding climbing on a full moon, we recommend arranging the summit attempt three to five days AFTER the full moon, for optimal moonlighting the summit trail during the night.
The greatest advantage of climbing at this time is that you can stay dry the entire time. Sure, you can always get rained on throughout the year, especially in the rain forest and moorlands, but typically the precipitation is low and infrequent. By staying dry, you stay comfortable and the overall trek will be more enjoyable. Removing the stress of being wet and cold also increases you chance of proper acclimatization. In the dry season, the views are better, with clear and sunny skies. The disadvantage is that the trails have many climbers, which can take away from the feeling of being on a big, remote mountain. However, some visitors look forward to socializing with other groups at camp. Not surprisingly, most people choose to climb during the dry season because the likelihood of nice weather trumps any misgivings they may have about encountering others on the mountain.
The prospect of having the mountain to yourself is what draws people to climb during the low season. The mountain is very empty and it is possible to be the only party at a campsite. This quiet and solicitude is what many people seek when going outdoors. Secondly, although it does rain quite a lot during the low season, most of the time the rains arrive in the afternoon. With Kilimanjaro’s trekking schedule, most of the hiking can be done in the mornings, which means that the time spent on trails while it rains can be minimalized. One thing people forget is that precipitation creates snow, which is not a bad thing. Kilimanjaro is best displayed during the rainy season. The most beautiful sights of the mountain often are enjoyed in the mornings after it snows. No matter when you climb, you have the chance to see the night sky over the rift valley.