September is one of the warmer months of the year in Santa Maria, with average highs near 24.4°C and lows around 15.2°C (mean 19.8°C). It is one of the drier months, averaging 7 mm of rainfall and 65% relative humidity across the period.
September is one of the warmer months of the year in Santa Maria. Across 45 years of records, the warmest September in Santa Maria was 1984 — when the month averaged 23.1°C — while the coldest was 1986 at 17.4°C. Typical September days reach 24.4°C with nights near 15.2°C. The long-term September temperature trend is broadly flat.
September is one of the drier months in Santa Maria, averaging 7 mm of rainfall. The wettest September on record was 2015 with 46 mm, while the driest were 1993, 1995 and 1996, among others at 0 mm.
Relative humidity in Santa Maria during September averages 65%. The most humid September was 2023 at 76%, and the least humid was 1984 at 54%.
September receives about 5.2 kWh/m²/day of solar energy in Santa Maria. The sunniest Septembers were 1997, 2004 and 2019 at 5.9 kWh/m²/day, and the cloudiest was 1991 at 4.3.
Average wind speed in Santa Maria during September is 2.7 m/s. The windiest September was 2013 at 3.2 m/s, while the calmest was 1991 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.9°C | 19.6°C | 19.5°C | 20.1°C | 20.0°C | +0.1°C |
| Avg High | 24.6°C | 24.3°C | 24.2°C | 24.7°C | 24.2°C | -0.4°C |
| Avg Low | 15.2°C | 15.0°C | 14.9°C | 15.5°C | 15.8°C | +0.6°C |
| Avg Rain | 11 mm | 5 mm | 5 mm | 7 mm | 10 mm | -1 mm |
September temperatures in Santa Maria have fallen by about 0.7°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 10.5°C (1982) to a record high of 36.7°C (2017).
Rainfall in September is one of the drier months, averaging 7 mm, with a wettest year of 46 mm.
One of the best times to visit Santa Maria
September is one of the best times to visit Santa Maria. Expect days averaging 24.4°C and nights around 15.2°C (mean 19.8°C) — warmer than Santa Maria's yearly average — with low rainfall (7 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 | 23.9°C | 20.1°C | 16.3°C | 27.7°C | 14.6°C | 14 mm | 76% | 2.4 m/s | 4.9 |
| 2024 | 23.8°C | 19.4°C | 15.0°C | 30.1°C | 12.9°C | 2 mm | 68% | 2.5 m/s | 5.2 |
| 2023 | 22.9°C | 19.0°C | 15.1°C | 26.9°C | 13.6°C | 2 mm | 76% | 2.9 m/s | 5.2 |
| 2022 | 25.3°C | 21.2°C | 17.2°C | 31.6°C | 13.6°C | 42 mm | 67% | 2.6 m/s | 5.6 |
| 2021 | 23.6°C | 19.2°C | 14.7°C | 28.6°C | 11.6°C | 0 mm | 67% | 2.3 m/s | 5 |
| 2020 | 25.9°C | 21.2°C | 16.4°C | 34.5°C | 14.0°C | 0 mm | 61% | 2.4 m/s | 4.9 |
| 2019 | 24.9°C | 20.4°C | 15.8°C | 31.5°C | 11.1°C | 3 mm | 63% | 2.8 m/s | 5.9 |
| 2018 | 23.8°C | 19.1°C | 14.4°C | 27.8°C | 12.3°C | 4 mm | 67% | 2.6 m/s | 5.3 |
| 2017 | 24.9°C | 20.6°C | 16.4°C | 36.7°C | 11.5°C | 7 mm | 67% | 2.8 m/s | 5.6 |
| 2016 | 24.4°C | 19.9°C | 15.4°C | 32.9°C | 12.4°C | 0 mm | 62% | 2.8 m/s | 5.4 |
| 2015 🌧️ | 26.1°C | 21.8°C | 17.5°C | 31.6°C | 12.9°C | 46 mm | 64% | 2.6 m/s | 5.8 |
| 2014 | 24.5°C | 20.2°C | 15.9°C | 28.3°C | 13.0°C | 6 mm | 71% | 2.8 m/s | 5.7 |
| 2013 | 24.1°C | 19.4°C | 14.6°C | 27.1°C | 11.0°C | 1 mm | 65% | 3.2 m/s | 5.8 |
| 2012 | 24.6°C | 19.9°C | 15.1°C | 29.2°C | 12.0°C | 2 mm | 61% | 2.5 m/s | 5.2 |
| 2011 | 24.6°C | 19.8°C | 15.0°C | 31.9°C | 12.2°C | 4 mm | 65% | 2.3 m/s | 4.8 |
| 2010 | 24.7°C | 19.7°C | 14.7°C | 36.1°C | 11.1°C | 1 mm | 61% | 2.6 m/s | 5.4 |
| 2009 | 25.5°C | 20.7°C | 16.0°C | 33.2°C | 10.9°C | 2 mm | 59% | 2.5 m/s | 5.4 |
| 2008 | 24.8°C | 19.9°C | 15.1°C | 28.8°C | 12.8°C | 4 mm | 64% | 2.6 m/s | 5.1 |
| 2007 | 23.1°C | 18.7°C | 14.4°C | 30.8°C | 11.4°C | 4 mm | 68% | 2.8 m/s | 5.8 |
| 2006 | 23.7°C | 18.9°C | 14.2°C | 28.9°C | 11.7°C | 10 mm | 66% | 2.7 m/s | 5.2 |
| 2005 | 22.5°C | 17.9°C | 13.4°C | 29.1°C | 11.1°C | 12 mm | 68% | 2.8 m/s | 5.6 |
| 2004 | 24.8°C | 20.2°C | 15.6°C | 32.6°C | 11.0°C | 10 mm | 60% | 2.7 m/s | 5.9 |
| 2003 | 24.7°C | 19.9°C | 15.2°C | 28.8°C | 13.2°C | 2 mm | 67% | 2.5 m/s | 5.2 |
| 2002 | 24.3°C | 19.6°C | 14.9°C | 29.8°C | 11.4°C | 2 mm | 60% | 2.5 m/s | 5 |
| 2001 | 23.9°C | 19.2°C | 14.6°C | 28.7°C | 12.7°C | 0 mm | 67% | 2.7 m/s | 4.9 |
| 2000 | 24.3°C | 19.8°C | 15.3°C | 29.6°C | 12.2°C | 4 mm | 65% | 2.9 m/s | 5.4 |
| 1999 | 23.4°C | 18.8°C | 14.1°C | 27.7°C | 12.0°C | 5 mm | 68% | 2.3 m/s | 4.7 |
| 1998 | 23.4°C | 19.3°C | 15.3°C | 29.0°C | 12.3°C | 13 mm | 72% | 2.9 m/s | 4.8 |
| 1997 | 26.1°C | 21.5°C | 16.8°C | 30.4°C | 13.6°C | 6 mm | 65% | 3 m/s | 5.9 |
| 1996 | 23.2°C | 18.6°C | 14.0°C | 26.8°C | 11.2°C | 0 mm | 64% | 2.6 m/s | 4.8 |
| 1995 | 24.5°C | 19.5°C | 14.6°C | 30.8°C | 12.1°C | 0 mm | 62% | 2.9 m/s | 5.3 |
| 1994 | 23.6°C | 19.0°C | 14.5°C | 30.6°C | 12.5°C | 15 mm | 69% | 2.7 m/s | 5.3 |
| 1993 | 24.7°C | 19.8°C | 14.8°C | 31.4°C | 11.3°C | 0 mm | 62% | 2.7 m/s | 4.9 |
| 1992 | 25.0°C | 20.2°C | 15.4°C | 29.6°C | 13.0°C | 0 mm | 62% | 2.6 m/s | 5.1 |
| 1991 | 24.3°C | 19.8°C | 15.2°C | 28.5°C | 11.9°C | 1 mm | 65% | 2.2 m/s | 4.3 |
| 1990 | 24.8°C | 19.9°C | 15.1°C | 30.0°C | 12.9°C | 11 mm | 65% | 2.9 m/s | 5.6 |
| 1989 | 23.9°C | 18.9°C | 14.0°C | 29.7°C | 11.2°C | 20 mm | 63% | 2.8 m/s | 5.1 |
| 1988 | 25.1°C | 20.1°C | 15.1°C | 36.5°C | 12.1°C | 0 mm | 57% | 2.5 m/s | 4.8 |
| 1987 | 25.5°C | 20.5°C | 15.5°C | 30.5°C | 12.8°C | 0 mm | 59% | 2.8 m/s | 4.6 |
| 1986 ❄️ | 21.8°C | 17.4°C | 13.0°C | 28.0°C | 11.1°C | 21 mm | 69% | 3 m/s | 5.1 |
| 1985 | 22.9°C | 18.5°C | 14.1°C | 30.4°C | 11.8°C | 2 mm | 66% | 2.9 m/s | 5.2 |
| 1984 🔥 | 27.7°C | 23.1°C | 18.4°C | 32.3°C | 12.9°C | 2 mm | 54% | 2.6 m/s | 5.6 |
| 1983 | 25.9°C | 21.5°C | 17.0°C | 33.9°C | 13.9°C | 32 mm | 61% | 2.7 m/s | — |
| 1982 | 24.0°C | 19.7°C | 15.3°C | 30.4°C | 10.5°C | 23 mm | 61% | 3 m/s | — |
| 1981 | 24.6°C | 19.6°C | 14.6°C | 29.3°C | 12.0°C | 1 mm | 60% | 2.6 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 24.4°C with lows near 15.2°C (mean 19.8°C), based on 45 years of NASA POWER data.
September averages 7 mm of rainfall in Santa Maria, one of the drier months. The wettest on record was 46 mm in 2015.
The hottest September reached 36.7°C in 2017. The coldest dipped to 10.5°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have fallen by about 0.7°C. Daytime highs moved from 25°C to 23.9°C and overnight lows from 15.9°C to 15.7°C over the same span.
September is one of the warmer months of the year in Santa Maria and one of the drier months, so plan for around 24.4°C daytime highs and 15.2°C at night.
Not quite — September is the 11th coolest month in Santa Maria, averaging 19.8°C.
For September in Santa Maria, pack light layers you can adjust through the day, with typical highs of 24.4°C and lows of 15.2°C.
Relative humidity in September averages 65% — moderately humid.
Average wind speed in September is 2.7 m/s. The windiest September on record averaged 3.2 m/s (2013).
The wettest September on record was 2015 with 46 mm. On average, September sees 7 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 Santa Maria 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.
