If the forecast is looking bleak, why not head to Nairobi National Museum? You'll be surprised just how many interesting facts you can learn about the past here.
This collection of historical artifacts is in Westlands, a place that has so much on offer! Moi International Sports Centre, Nairobi National Park, and United Nations Office at Nairobi are other worthwhile sightseeing options nearby when you're done at Nairobi National Museum.