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Weather & Climate in Siaya, Kenya
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Siaya has a warm climate with an average annual temperature of 72°F (22°C). Winters average 73°F in January while summers reach 70°F in July / relatively mild seasonal variation. The area gets 235 sunny days per year, above the national average. Annual precipitation totals 55.4 inches (wetter than the 38-inch national average). The city sits at an elevation of 4,334 feet.
Temperature
73°F Jan (23°C)
70°F Jul (21°C)
| Annual Average | 71.8°F |
| 33% above US avg | |
| January Average | 73°F (23°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 235 days/yr |
Geography
| Elevation | 4,334 ft (1,321 m) |
| Area | 20.2 sq mi (52.4 km²) |
| Population Density | 1,638/sq mi |
| Coordinates | 0.0607°N, 34.2881°W |
| Timezone | Africa/Nairobi |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Jun 13, 2010 | 32 km WSW of Kisumu, Kenya | M5.0 | 37 km | 10 km |
| Jun 17, 2021 | 102 km NNW of Musoma, Tanzania | M4.6 | 127 km | 10 km |
| Aug 11, 1990 | 30 km SE of Lugazi, Uganda | M4.5 | 131 km | 33 km |
| Aug 31, 2022 | 14 km NE of Buwenge, Uganda | M4.2 | 135 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Nearby Volcanoes
1 volcano within 200 km. Closest: Homa Mountain (54 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Homa Mountain | Complex | 1,751 m (5,745 ft) | Unknown | 54 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 73°F (23°C) | 1.9 in | Driest |
| February | 74°F (23°C) | 3.1 in | Warmest |
| March | 73°F (23°C) | 5.3 in | |
| April | 72°F (22°C) | 8.9 in | Wettest |
| May | 71°F (22°C) | 7.5 in | |
| June | 71°F (21°C) | 3.6 in | |
| July | 70°F (21°C) | 2.8 in | Coldest |
| August | 70°F (21°C) | 4.3 in | |
| September | 71°F (22°C) | 4.3 in | |
| October | 72°F (22°C) | 4.7 in | |
| November | 72°F (22°C) | 5.4 in | |
| December | 72°F (22°C) | 3.8 in |
Siaya has a seasonal temperature swing of 3°F / from 70°F in July to 74°F in February. Total annual precipitation is 55.4 inches, with April being the wettest month (8.9") and January the driest (1.9").