September is one of the warmer months of the year in Strathmore, with average highs near 19.1°C and lows around 6°C (mean 12.6°C). It is about average for rainfall, averaging 41 mm of rainfall and 62% relative humidity across the period.
September is one of the warmer months of the year in Strathmore. Across 45 years of records, the warmest September in Strathmore was 2025 — when the month averaged 16.9°C — while the coldest was 1985 at 7.3°C. Typical September days reach 19.1°C with nights near 6°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Strathmore, averaging 41 mm of rainfall. The wettest September on record was 1986 with 120 mm, while the driest was 2025 at 8 mm.
Relative humidity in Strathmore during September averages 62%. The most humid September was 1986 at 74%, and the least humid was 2009 at 49%.
September receives about 3.8 kWh/m²/day of solar energy in Strathmore. The sunniest September was 1990 at 4.5 kWh/m²/day, and the cloudiest were 1986 and 2018 at 2.9.
Average wind speed in Strathmore during September is 2.5 m/s. The windiest Septembers were 1985 and 2009 at 2.9 m/s, while the calmest were 2008 and 2025 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.8°C | 12.9°C | 12.4°C | 12.5°C | 15.2°C | +4.4°C |
| Avg High | 17.0°C | 19.8°C | 19.0°C | 18.8°C | 21.7°C | +4.7°C |
| Avg Low | 4.5°C | 5.9°C | 5.8°C | 6.1°C | 8.7°C | +4.2°C |
| Avg Rain | 64 mm | 29 mm | 44 mm | 39 mm | 25 mm | -38 mm |
September temperatures in Strathmore have risen by about 5.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -6.4°C (2019) to a record high of 33.6°C (1998).
Rainfall in September is about average for rainfall, averaging 41 mm, with a wettest year of 120 mm.
One of the best times to visit Strathmore
September is one of the best times to visit Strathmore. Expect days averaging 19.1°C and nights around 6°C (mean 12.6°C) — warmer than Strathmore's yearly average — with moderate rainfall (41 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 23.6°C | 16.9°C | 10.3°C | 28.8°C | 5.2°C | 8 mm | 62% | 2 m/s | 4.2 |
| 2024 | 21.8°C | 15.5°C | 9.3°C | 31.7°C | 2.6°C | 65 mm | 65% | 2.4 m/s | 3.9 |
| 2023 | 20.7°C | 14.5°C | 8.4°C | 29.1°C | 3.3°C | 23 mm | 60% | 2.3 m/s | 3.8 |
| 2022 | 22.6°C | 15.9°C | 9.2°C | 32.4°C | 2.1°C | 14 mm | 57% | 2.4 m/s | 4.1 |
| 2021 | 21.1°C | 14.5°C | 7.8°C | 27.2°C | 2.5°C | 16 mm | 55% | 2.5 m/s | 3.9 |
| 2020 | 20.1°C | 13.7°C | 7.3°C | 28.4°C | 1.5°C | 26 mm | 65% | 2.6 m/s | 3.7 |
| 2019 | 17.4°C | 12.0°C | 6.6°C | 26.0°C | -6.4°C | 63 mm | 69% | 2.5 m/s | 3.4 |
| 2018 | 13.7°C | 8.3°C | 2.9°C | 28.2°C | -5.2°C | 36 mm | 69% | 2.2 m/s | 2.9 |
| 2017 | 19.9°C | 13.2°C | 6.5°C | 32.2°C | -0.1°C | 22 mm | 58% | 2.4 m/s | 3.8 |
| 2016 | 18.3°C | 12.1°C | 6.0°C | 26.1°C | 1.3°C | 33 mm | 65% | 2.3 m/s | 3.8 |
| 2015 | 17.9°C | 11.6°C | 5.3°C | 28.4°C | 0.7°C | 60 mm | 66% | 2.3 m/s | 3.6 |
| 2014 | 18.5°C | 12.3°C | 6.1°C | 27.9°C | -5.7°C | 54 mm | 67% | 2.4 m/s | 3.6 |
| 2013 | 21.3°C | 14.9°C | 8.4°C | 29.7°C | 0.2°C | 39 mm | 59% | 2.6 m/s | 4.1 |
| 2012 | 22.4°C | 15.1°C | 7.7°C | 27.6°C | 3.1°C | 8 mm | 54% | 2.6 m/s | 4.3 |
| 2011 | 22.5°C | 15.0°C | 7.5°C | 29.3°C | 1.4°C | 16 mm | 55% | 2.7 m/s | 4.4 |
| 2010 | 15.8°C | 10.1°C | 4.4°C | 24.9°C | -2.4°C | 59 mm | 71% | 2.4 m/s | 3.1 |
| 2009 | 24.0°C | 16.1°C | 8.2°C | 31.7°C | 1.5°C | 9 mm | 49% | 2.9 m/s | 4.4 |
| 2008 | 18.6°C | 12.0°C | 5.3°C | 26.5°C | 2.3°C | 46 mm | 66% | 2 m/s | 4 |
| 2007 | 17.3°C | 11.1°C | 4.9°C | 25.6°C | -1.6°C | 44 mm | 66% | 2.3 m/s | 3.9 |
| 2006 | 19.8°C | 13.2°C | 6.5°C | 30.0°C | -2.2°C | 53 mm | 63% | 2.6 m/s | 3.7 |
| 2005 | 16.8°C | 10.8°C | 4.8°C | 26.1°C | -1.0°C | 78 mm | 70% | 2.3 m/s | 3.6 |
| 2004 | 17.0°C | 11.0°C | 5.0°C | 23.4°C | -3.4°C | 37 mm | 71% | 2.4 m/s | 3.4 |
| 2003 | 18.5°C | 12.1°C | 5.6°C | 31.1°C | -3.5°C | 43 mm | 60% | 2.5 m/s | 3.7 |
| 2002 | 17.2°C | 11.3°C | 5.5°C | 27.4°C | -0.3°C | 80 mm | 66% | 2.5 m/s | 3.4 |
| 2001 | 22.3°C | 14.8°C | 7.3°C | 30.8°C | 3.0°C | 14 mm | 49% | 2.5 m/s | 3.9 |
| 2000 | 18.3°C | 11.6°C | 5.0°C | 27.7°C | -5.4°C | 40 mm | 61% | 2.4 m/s | 3.7 |
| 1999 | 18.5°C | 11.8°C | 5.0°C | 28.3°C | -2.8°C | 10 mm | 57% | 2.5 m/s | 4.3 |
| 1998 | 21.5°C | 14.5°C | 7.4°C | 33.6°C | 0.8°C | 45 mm | 56% | 2.4 m/s | 4 |
| 1997 | 21.6°C | 14.6°C | 7.5°C | 29.8°C | -0.9°C | 26 mm | 57% | 2.6 m/s | 4.2 |
| 1996 | 16.0°C | 10.5°C | 4.9°C | 29.1°C | -1.6°C | 61 mm | 65% | 2.6 m/s | 3.1 |
| 1995 | 20.3°C | 13.3°C | 6.4°C | 29.2°C | -3.1°C | 18 mm | 55% | 2.2 m/s | 4.2 |
| 1994 | 22.6°C | 14.9°C | 7.3°C | 29.1°C | 1.7°C | 17 mm | 53% | 2.4 m/s | 4.1 |
| 1993 | 17.3°C | 10.7°C | 4.1°C | 26.6°C | -1.3°C | 34 mm | 66% | 2.5 m/s | 3.9 |
| 1992 | 16.9°C | 10.0°C | 3.0°C | 27.9°C | -3.0°C | 44 mm | 62% | 2.7 m/s | 3.5 |
| 1991 | 20.1°C | 13.0°C | 5.9°C | 27.1°C | -1.3°C | 26 mm | 59% | 2.5 m/s | 4.1 |
| 1990 | 23.4°C | 15.4°C | 7.5°C | 30.3°C | 1.2°C | 9 mm | 52% | 2.4 m/s | 4.5 |
| 1989 | 19.0°C | 12.3°C | 5.5°C | 26.3°C | -1.6°C | 37 mm | 63% | 2.6 m/s | 4.3 |
| 1988 | 18.9°C | 12.3°C | 5.7°C | 31.5°C | -2.4°C | 45 mm | 60% | 2.7 m/s | 3.3 |
| 1987 | 21.6°C | 14.4°C | 7.1°C | 30.5°C | 3.8°C | 27 mm | 58% | 2.4 m/s | 4.2 |
| 1986 🌧️ | 13.2°C | 8.0°C | 2.8°C | 23.5°C | -1.7°C | 120 mm | 74% | 2.3 m/s | 2.9 |
| 1985 ❄️ | 13.0°C | 7.3°C | 1.5°C | 20.8°C | -5.7°C | 98 mm | 70% | 2.9 m/s | 3.2 |
| 1984 | 14.3°C | 8.4°C | 2.5°C | 28.6°C | -5.0°C | 106 mm | 67% | 2.6 m/s | 3.4 |
| 1983 | 16.3°C | 10.0°C | 3.7°C | 28.5°C | -4.5°C | 17 mm | 62% | 2.7 m/s | — |
| 1982 | 17.3°C | 11.3°C | 5.3°C | 27.4°C | -2.6°C | 86 mm | 68% | 2.7 m/s | — |
| 1981 | 19.5°C | 12.9°C | 6.4°C | 31.2°C | -1.7°C | 38 mm | 60% | 2.3 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 19.1°C with lows near 6°C (mean 12.6°C), based on 45 years of NASA POWER data.
September averages 41 mm of rainfall in Strathmore, about average for rainfall. The wettest on record was 120 mm in 1986.
The hottest September reached 33.6°C in 1998. The coldest dipped to -6.4°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.5°C. Daytime highs moved from 16.1°C to 22°C and overnight lows from 3.9°C to 9°C over the same span.
September is one of the warmer months of the year in Strathmore and about average for rainfall, so plan for around 19.1°C daytime highs and 6°C at night.
Not quite — September is the 9th coolest month in Strathmore, averaging 12.6°C.
For September in Strathmore, pack warm layers and a jacket for chilly mornings, with typical highs of 19.1°C and lows of 6°C.
Relative humidity in September averages 62% — moderately humid.
Average wind speed in September is 2.5 m/s. The windiest September on record averaged 2.9 m/s (1985).
The wettest September on record was 1986 with 120 mm. On average, September sees 41 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Strathmore behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
