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Monthly climate in Siaya, Kenya

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Siaya features a tropical rainforest climate (Af). Temperatures typically range between 22 °C (72 °F) and 24 °C (75 °F) through the year, but rarely can drop to 17 °C (63 °F) or can rise to as high as 33 °C (91 °F). The average annual precipitation amounts to about 2192 mm (86.3 inches) and receives 277 rainy days on the 1 mm (0.04 inches) threshold annually. Siaya enjoys an average of 3883 hours of sunshine throughout the year, and daylight varies from 12 hours 6 minutes to 12 hours 7 minutes per day.

Monthly average temperatures in Siaya, Kenya

The warmest months in Siaya are January, February and March, with daily mean temperatures ranging from 23 to 24 °C (74 - 75 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 22 to 22 °C (72 - 73 °F) throughout the day. On average each year, Siaya experiences 288 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Siaya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum33°C
(91°F)		33°C
(91°F)		33°C
(91°F)		31°C
(88°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		29°C
(84°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		31°C
(87°F)
Mean maximum30°C
(87°F)		31°C
(87°F)		30°C
(87°F)		29°C
(85°F)		28°C
(83°F)		27°C
(82°F)		27°C
(82°F)		28°C
(83°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		29°C
(85°F)
Average high27°C
(81°F)		28°C
(83°F)		27°C
(82°F)		26°C
(80°F)		26°C
(80°F)		26°C
(79°F)		26°C
(79°F)		27°C
(80°F)		27°C
(80°F)		27°C
(80°F)		26°C
(80°F)		27°C
(80°F)
Daily mean23°C
(74°F)		24°C
(75°F)		23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		22°C
(73°F)		22°C
(72°F)		22°C
(73°F)		23°C
(73°F)		23°C
(73°F)		23°C
(73°F)		23°C
(73°F)
Average low20°C
(68°F)		20°C
(69°F)		20°C
(69°F)		20°C
(68°F)		20°C
(68°F)		20°C
(67°F)		19°C
(67°F)		19°C
(67°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)		20°C
(68°F)
Mean minimum18°C
(65°F)		19°C
(66°F)		19°C
(66°F)		19°C
(66°F)		19°C
(66°F)		18°C
(65°F)		18°C
(64°F)		18°C
(64°F)		18°C
(65°F)		19°C
(66°F)		18°C
(65°F)		18°C
(65°F)
Minimum17°C
(63°F)		18°C
(64°F)		18°C
(65°F)		18°C
(65°F)		18°C
(64°F)		17°C
(64°F)		17°C
(63°F)		17°C
(64°F)		18°C
(65°F)		18°C
(65°F)		18°C
(65°F)		18°C
(64°F)

Compare climate in Siaya with other places

Compare temperature, precipitation, sunshine, UV index in Siaya, Kenya with other places around the world.

Monthly average precipitation in Siaya, Kenya

Siaya usually has the most precipitation in April, May and October, with an average of 28 rainy days and 265 mm (10.4 inches) of precipitation per month. The driest months in Siaya are January, February and July. On average, 112 mm (4.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Siaya. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)115 (4.5)111 (4.4)219 (8.6)283 (11.1)269 (10.6)142 (5.6)111 (4.4)142 (5.6)159 (6.2)243 (9.6)218 (8.6)181 (7.1)
Average precipitation days (≥ 1 mm)141523273023202324282624

Monthly sunshine hours in Siaya, Kenya

The sunniest months in Siaya are July, August and December, when the sun shines an average of 10 hours 58 minutes a day. Least sunny months in Siaya: January, February and April receive an average of 9 hours 55 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Siaya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours279308333305321323336339330333326344
Mean daily daylight hours12h 6m12h 6m12h 6m12h 6m12h 6m12h 7m12h 6m12h 6m12h 6m12h 6m12h 6m12h 6m

Solar UV radiation in Siaya, Kenya

Siaya experiences the highest level of ultraviolet (UV) radiation in February, March and April, when the maximum UV index can reach values of 15 - 16, which corresponds to the Extreme category of sun exposure. June, July and November are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 12. For more detailed information, check out our hourly Siaya UV Index data.

Average daily maximum UV levels by month for Siaya. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141516151311121213131212