March is one of the cooler months of the year in San Tan Valley, with average highs near 23.1°C and lows around 7.5°C (mean 15.3°C). It is about average for rainfall, averaging 30 mm of rainfall and 42% relative humidity across the period.
March is one of the cooler months of the year in San Tan Valley. Across 45 years of records, the warmest March in San Tan Valley was 2004 — when the month averaged 19.1°C — while the coldest was 1991 at 11.3°C. Typical March days reach 23.1°C with nights near 7.5°C. The long-term trend is warming, about 0.5°C per decade.
March is about average for rainfall in San Tan Valley, averaging 30 mm of rainfall. The wettest March on record was 1983 with 122 mm, while the driest was 2016 at 0 mm.
Relative humidity in San Tan Valley during March averages 42%. The most humid March was 1992 at 64%, and the least humid was 2002 at 23%.
March receives about 5.7 kWh/m²/day of solar energy in San Tan Valley. The sunniest Marchs were 1997 and 2008 at 6.3 kWh/m²/day, and the cloudiest was 1991 at 4.8.
Average wind speed in San Tan Valley during March is 2.3 m/s. The windiest March was 1991 at 2.8 m/s, while the calmest was 1992 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.6°C | 14.7°C | 15.3°C | 16.7°C | 15.1°C | +0.5°C |
| Avg High | 22.5°C | 22.4°C | 23.3°C | 24.7°C | 22.5°C | 0°C |
| Avg Low | 6.7°C | 6.9°C | 7.3°C | 8.8°C | 7.8°C | +1.1°C |
| Avg Rain | 44 mm | 42 mm | 24 mm | 14 mm | 28 mm | -17 mm |
March temperatures in San Tan Valley have risen by about 1.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -1.9°C (1990) to a record high of 36.2°C (2007).
Rainfall in March is about average for rainfall, averaging 30 mm, with a wettest year of 122 mm.
A good time to visit San Tan Valley
March is a good time to visit San Tan Valley, with days averaging 23.1°C and nights around 7.5°C (mean 15.3°C, cooler than San Tan Valley's yearly average) and moderate rainfall. October and May are marginally more temperate, but March still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 24.0°C | 16.3°C | 8.6°C | 35.0°C | 3.4°C | 25 mm | 36% | 2.4 m/s | 5.6 |
| 2024 | 21.2°C | 14.4°C | 7.7°C | 27.0°C | 4.8°C | 45 mm | 51% | 2.1 m/s | 5.3 |
| 2023 | 20.3°C | 13.7°C | 7.1°C | 26.9°C | 1.1°C | 34 mm | 49% | 2.2 m/s | 5.1 |
| 2022 | 24.3°C | 16.1°C | 7.8°C | 33.9°C | 1.5°C | 9 mm | 30% | 2.3 m/s | 6 |
| 2021 | 23.1°C | 14.9°C | 6.8°C | 30.5°C | -0.2°C | 9 mm | 33% | 2.6 m/s | 5.8 |
| 2020 | 22.1°C | 15.4°C | 8.7°C | 28.0°C | 3.6°C | 43 mm | 52% | 2.1 m/s | 5.4 |
| 2019 | 23.2°C | 16.0°C | 8.8°C | 30.1°C | 3.2°C | 14 mm | 45% | 2.4 m/s | 5.7 |
| 2018 | 24.1°C | 16.5°C | 9.0°C | 31.8°C | 1.1°C | 1 mm | 32% | 2 m/s | 5.7 |
| 2017 | 27.0°C | 18.8°C | 10.6°C | 33.5°C | 3.5°C | 4 mm | 37% | 2.2 m/s | 6 |
| 2016 | 26.2°C | 18.1°C | 9.9°C | 31.7°C | 5.2°C | 0 mm | 25% | 2.2 m/s | 6.1 |
| 2015 | 26.2°C | 18.6°C | 11.0°C | 32.5°C | 2.9°C | 19 mm | 39% | 2.1 m/s | 5.8 |
| 2014 | 25.0°C | 17.1°C | 9.2°C | 29.4°C | 6.1°C | 30 mm | 34% | 2.2 m/s | 5.9 |
| 2013 | 25.3°C | 17.1°C | 9.0°C | 32.3°C | 2.7°C | 21 mm | 36% | 2.1 m/s | 5.9 |
| 2012 | 23.9°C | 15.3°C | 6.8°C | 31.5°C | 0.1°C | 19 mm | 33% | 2.2 m/s | 6.1 |
| 2011 | 25.3°C | 16.9°C | 8.5°C | 32.0°C | 3.1°C | 7 mm | 32% | 2.2 m/s | 6 |
| 2010 | 20.8°C | 12.9°C | 5.0°C | 28.2°C | 0.4°C | 28 mm | 52% | 2.3 m/s | 5.8 |
| 2009 | 24.1°C | 15.9°C | 7.6°C | 31.1°C | 3.0°C | 3 mm | 34% | 2.2 m/s | 6.1 |
| 2008 | 23.0°C | 14.7°C | 6.3°C | 28.3°C | 0.0°C | 2 mm | 39% | 2.1 m/s | 6.3 |
| 2007 | 25.3°C | 17.1°C | 8.9°C | 36.2°C | 0.6°C | 26 mm | 31% | 2.4 m/s | 6 |
| 2006 | 20.9°C | 13.8°C | 6.7°C | 27.7°C | -0.8°C | 45 mm | 40% | 2.3 m/s | 5 |
| 2005 | 20.8°C | 13.5°C | 6.2°C | 28.5°C | 1.2°C | 25 mm | 56% | 2.1 m/s | 5.7 |
| 2004 🔥 | 27.2°C | 19.1°C | 11.0°C | 33.5°C | 3.6°C | 39 mm | 40% | 2.5 m/s | 5.8 |
| 2003 | 22.5°C | 14.5°C | 6.5°C | 30.9°C | 0.6°C | 23 mm | 44% | 2.2 m/s | 5.6 |
| 2002 | 23.8°C | 15.0°C | 6.2°C | 32.9°C | -1.7°C | 7 mm | 23% | 2.5 m/s | 6.2 |
| 2001 | 23.2°C | 15.2°C | 7.2°C | 30.9°C | 2.4°C | 21 mm | 46% | 2.1 m/s | 5.7 |
| 2000 | 22.5°C | 14.6°C | 6.7°C | 27.9°C | 1.0°C | 46 mm | 40% | 2.2 m/s | 5.4 |
| 1999 | 24.8°C | 16.4°C | 8.1°C | 31.7°C | 2.4°C | 5 mm | 27% | 2.2 m/s | 5.9 |
| 1998 | 20.3°C | 12.9°C | 5.5°C | 29.7°C | -1.3°C | 62 mm | 56% | 2.4 m/s | 5.4 |
| 1997 | 26.6°C | 17.6°C | 8.6°C | 33.1°C | -0.8°C | 2 mm | 33% | 2.3 m/s | 6.3 |
| 1996 | 23.6°C | 15.0°C | 6.4°C | 30.8°C | 1.2°C | 10 mm | 35% | 2.6 m/s | 5.8 |
| 1995 | 21.9°C | 14.5°C | 7.1°C | 28.5°C | 1.5°C | 40 mm | 54% | 2.2 m/s | 5.6 |
| 1994 | 23.4°C | 15.6°C | 7.8°C | 28.8°C | 3.0°C | 37 mm | 46% | 2.3 m/s | 5.4 |
| 1993 | 21.8°C | 14.5°C | 7.2°C | 27.2°C | 1.5°C | 34 mm | 60% | 2 m/s | 5.5 |
| 1992 | 20.2°C | 13.6°C | 6.9°C | 26.6°C | 2.8°C | 93 mm | 64% | 1.9 m/s | 5.1 |
| 1991 ❄️ | 18.7°C | 11.3°C | 3.9°C | 25.9°C | 0.3°C | 95 mm | 56% | 2.8 m/s | 4.8 |
| 1990 | 22.8°C | 15.2°C | 7.6°C | 31.1°C | -1.9°C | 38 mm | 42% | 2.4 m/s | 5.1 |
| 1989 | 26.2°C | 17.6°C | 9.0°C | 32.5°C | -0.1°C | 30 mm | 34% | 2.4 m/s | 5.6 |
| 1988 | 23.5°C | 14.7°C | 5.9°C | 35.5°C | 0.0°C | 3 mm | 34% | 2.6 m/s | 6.1 |
| 1987 | 20.7°C | 12.7°C | 4.8°C | 27.5°C | 0.4°C | 24 mm | 48% | 2.5 m/s | 5.7 |
| 1986 | 24.5°C | 16.9°C | 9.2°C | 32.1°C | 1.9°C | 71 mm | 47% | 2.4 m/s | 5.3 |
| 1985 | 20.9°C | 13.5°C | 6.2°C | 27.9°C | -0.2°C | 24 mm | 53% | 2.3 m/s | 5.3 |
| 1984 | 24.2°C | 15.5°C | 6.8°C | 29.8°C | 1.1°C | 1 mm | 34% | 2.4 m/s | 5.8 |
| 1983 🌧️ | 19.8°C | 13.0°C | 6.3°C | 26.9°C | 1.9°C | 122 mm | 63% | 2.5 m/s | — |
| 1982 | 21.1°C | 13.8°C | 6.5°C | 27.7°C | 1.4°C | 61 mm | 49% | 2.1 m/s | — |
| 1981 | 21.2°C | 13.6°C | 6.0°C | 29.2°C | 2.8°C | 62 mm | 49% | 2.3 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 23.1°C with lows near 7.5°C (mean 15.3°C), based on 45 years of NASA POWER data.
March averages 30 mm of rainfall in San Tan Valley, about average for rainfall. The wettest on record was 122 mm in 1983.
The hottest March reached 36.2°C in 2007. The coldest dipped to -1.9°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 1.2°C. Daytime highs moved from 21.4°C to 22.6°C and overnight lows from 6.4°C to 7.6°C over the same span.
March is one of the cooler months of the year in San Tan Valley and about average for rainfall, so plan for around 23.1°C daytime highs and 7.5°C at night.
Not quite — March is the 4th coolest month in San Tan Valley, averaging 15.3°C.
For March in San Tan Valley, pack warm layers and a jacket for chilly mornings, with typical highs of 23.1°C and lows of 7.5°C.
Relative humidity in March averages 42% — relatively dry.
Average wind speed in March is 2.3 m/s. The windiest March on record averaged 2.8 m/s (1991).
The wettest March on record was 1983 with 122 mm. On average, March sees 30 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 San Tan Valley behaves each March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
