May is not supposed to be the calmest month in Uganda. It never is. But the edition being written across the country’s skies in 2026 has a particular intensity to it — one that the Ministry of Water and Environment warned about in its monthly bulletin issued on 4 May, and which regional forecasters at ICPAC are now tracking with marked concern.

The month marks the tail end of Uganda’s long rains season — the March-April-May (MAM) cycle that meteorologists know shapes the country’s agricultural fortunes and its disaster calendar alike. April was already soaking. Entebbe recorded 332.5mm of rainfall, Kamenyamigo in Masaka 302.3mm, and Bulindi in Hoima 235mm — figures that sit well above long-term averages stretching back to 1991. Only the southern cattle corridor and parts of Karamoja recorded below-average totals.

May, official forecasters say, will not bring relief. Not yet.

Why this month is different

Three climate forces are combining to sustain the deluge. The Arabian High and Mascarene High — large atmospheric pressure systems — are controlling the transport of moisture into the Great Lakes region. Meanwhile, the Inter-Tropical Convergence Zone (ITCZ), the equatorial band of thunderstorm activity, has shifted into the northern hemisphere, channelling rainfall energy toward Uganda’s Northern and Eastern regions.

The third driver is the Madden-Julian Oscillation (MJO) — a planetary-scale pulse of cloud and rainfall that moves eastward through the tropics over a period of 30 to 60 days. It is currently strong, and positioned in a phase that amplifies rainfall across most of Uganda. The Ministry’s bulletin notes it is expected to remain in this enhancing phase until approximately mid-May, after which it will weaken toward a neutral state.

Lake Victoria adds a further local layer: its vast warm surface generates lake-breeze circulation and convection that continue to prime the atmosphere for intense rainfall events across the Lake Victoria basin.

What the regions can expect

The rainfall outlook for May is not uniform across Uganda’s landscape. The Western region is currently receiving enhanced rainfall that forecasters expect to persist until mid-May, after which a gradual decline will bring only occasional light showers. The Central region, which includes Kampala, follows a similar trajectory — enhanced rains to mid-month, then moderation. Both regions are nonetheless expected to record above-average totals for the month overall.

In the East and the North, the story runs longer. Eastern Uganda’s rainfall is forecast to continue well into mid-to-late May before a moderate decline. Northern Uganda is expected to see rainfall peak in early-to-mid May and then sustain at moderate levels through to the month’s end. Karamoja, which saw below-average April rains, is now catching up: its peak is projected for mid-to-late May.

The ICPAC regional picture

The pattern does not stop at Uganda’s borders. The IGAD Climate Prediction and Applications Centre’s weekly forecast for 13–20 May 2026 shows the broader regional sweep of this rainfall episode.

For Uganda specifically, this forecast aligns closely with the Ministry’s national outlook. The convergence of regional and national data gives forecasters unusual confidence in the projection — though it also means the window for preventive action is narrow.

Temperature: warm, but not exceptional

On the temperature front, May 2026 holds no dramatic surprises — though the figures matter for the agricultural sector. Maximum temperatures across most of the country are expected to range between 20°C and 26°C, with West Nile, Northern and Eastern regions experiencing slightly warmer peaks of 28–32°C. Minimum temperatures across the North will hold between 20–24°C overnight, while the highland areas of Mount Elgon could dip below 12°C.

When rain becomes a hazard

It is when the rainfall numbers are set against Uganda’s geography and infrastructure that the scale of risk becomes visible. The Ministry’s bulletin is direct: heavy rains raise the probability of flooding, landslides, disease outbreaks, and infrastructure damage.

Low-lying and flood-prone districts face the most acute danger. These include parts of West Nile, Buganda, Teso, Lango, and the areas around Lake Victoria — including urban centres such as Kampala, whose drainage systems have long struggled under the weight of intense short-duration downpours.

In the mountain highlands — the slopes of the Rwenzori, Mount Elgon, and the Kigezi Highlands — the threat is one of landslides and mudslides. When heavy rains saturate steep terrain, the results can be catastrophic: homes and farmland buried, roads blocked, communities displaced.

The agricultural double-edged sword

For Uganda’s smallholder farmers — who make up the backbone of the country’s food system — the May rains represent one of the year’s most consequential periods. The outlook carries genuine promise: above-average rainfall improves soil moisture, regenerates pasture, raises water availability for irrigation, and can significantly lift crop production potential.

But the same rains bring their own agricultural risks. Excessive moisture creates conditions for soil erosion, crop rot, and infestations of pests such as the Fall Army Worm. Post-harvest losses mount when rain delays drying and market transport. The Ministry urges farmers to plan planting and harvest timing carefully around the forecast window, and to maximise rainwater harvesting while conditions allow.

What authorities are being asked to do

The Ministry of Water and Environment has issued a raft of public and institutional advisories. Communities are urged to monitor early warning updates, clear drainage channels, avoid crossing flooded roads and bridges, and temporarily relocate from high-risk slopes and flood zones. Authorities at district level are being asked to activate disaster preparedness plans before conditions deteriorate.

Practical household measures — securing roofs and weak structures ahead of storms, practising mosquito control, and harvesting rainwater — round out the advisory. The Ministry also recommends using the monthly outlook alongside shorter-range forecasts issued on 6-hour, 12-hour, 24-hour, 5-day, and 10-day cycles.

The underlying message is clear: this May will test Uganda’s preparedness infrastructure as much as it tests its skies. The climate drivers are delivering. Whether communities can convert that forecast into effective action remains the more uncertain question.