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Nairobi and Mombasa are among counties set for above-average November rain, with highs up to 38°C in the north, the Kenya Meteorological Service Authority said on 30 October 2026.
The Kenya Meteorological Department's heavy rainfall advisory, issued on 24 October, warns that floodwater may reach areas where it has not rained heavily, particularly downstream: flash floods are fed by rain upstream, and steep slopes, saturated soil and paved ground send it to the channels faster.
The Kenya Meteorological Service Authority (KMSA), formerly the Kenya Meteorological Department, expects more than 20 millimetres of rain within 24 hours in parts of Kenya from 24 to 28 October, with large waves and strong winds on the coast; The Star listed 40 affected counties on 25 October.
The Kenya Meteorological Service Authority's weekly bulletin of 19 October 2026 forecasts rain in parts of Narok, Kajiado, Kilifi, Kwale, Lamu, Mombasa, Taita Taveta, Turkana and Nairobi counties for 20–26 October.
