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September Weather in Siaya, Kenya

Last updated: August 23, 2025

In September, the average temperature in Siaya, Kenya is a pleasant 23°C (73°F), with minimums dipping to 18°C (65°F) and maximums reaching 30°C (86°F). Expect about 159 mm (6.2 in) of rainfall spread over 24 days, contributing to a humidity level of 73%. Whether you’re planning outdoor adventures or cozy indoor activities, don't forget to prepare for a bit of both sun and rain!

September Temperature in Siaya

In September in Siaya, the average temperature is 23°C (73°F). The maximum can reach 30°C (86°F), and the minimum can be as low as 18°C (65°F). This mild and pleasant weather makes it a perfect time for outdoor activities and sightseeing.

September Weather in Siaya: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Siaya, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Siaya, September typically has an average temperature of 23°C (73°F), with highs reaching up to 30°C (86°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec747574737372727273737373
Data source: Temperature data for Siaya generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Siaya

In Siaya in September, the precipitation amount is 159 mm (6.2 in), spread over 24 days.

September Precipitation Trends in Siaya

The chart displays monthly precipitation patterns in Siaya, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Siaya, September typically receives around 159 mm (6.2 inches) of precipitation spread over approximately 24 days.
JanFebMarAprMayJunJulAugSepOctNovDec115111219283269142111142159243219181
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Siaya

In Siaya in September humidity is 73%. With an average temperature of 23°C (73°F), this humidity feels like a thick blanket wrapping around you, making travel feel stifling and sticky, as every step seems to linger in the moisture-laden air.

September Average Humidity in Siaya

This chart illustrates the average monthly humidity levels in Siaya, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Siaya is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%72%69%73%81%75%71%69%73%80%85%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Siaya

In Siaya in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Siaya.

Maximum UV Index Levels in Siaya for September

The chart shows the monthly maximum UV Index (UVI) for Siaya in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Siaya typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141516151311121213131212
Data source: Siaya September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Siaya Compares to Other Months

Weather in Siaya varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Siaya, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Siaya, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)115 mm (4.5 inches)72%extreme
February Weather24°C (75°F)111 mm (4.4 inches)72%extreme
March Weather23°C (74°F)219 mm (8.6 inches)69%extreme
April Weather23°C (73°F)283 mm (11.1 inches)73%extreme
May Weather23°C (73°F)269 mm (10.6 inches)81%extreme
June Weather22°C (73°F)142 mm (5.6 inches)75%extreme
July Weather22°C (72°F)111 mm (4.4 inches)71%extreme
August Weather22°C (73°F)142 mm (5.6 inches)69%extreme
September Weather23°C (73°F)159 mm (6.2 inches)73%extreme
October Weather23°C (73°F)243 mm (9.6 inches)80%extreme
November Weather23°C (73°F)218 mm (8.6 inches)85%extreme
December Weather23°C (73°F)181 mm (7.1 inches)80%extreme

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