April is one of the cooler months of the year in San Tan Valley, with average highs near 27.7°C and lows around 10.8°C (mean 19.3°C). It is one of the drier months, averaging 10 mm of rainfall and 32% relative humidity across the period.
April is one of the cooler months of the year in San Tan Valley. Across 45 years of records, the warmest April in San Tan Valley was 1989 — when the month averaged 22.8°C — while the coldest was 1983 at 14.3°C. Typical April days reach 27.7°C with nights near 10.8°C. The long-term trend is warming, about 0.5°C per decade.
April is one of the drier months in San Tan Valley, averaging 10 mm of rainfall. The wettest April on record was 1988 with 56 mm, while the driest were 2018, 2022 and 2023, among others at 0 mm.
Relative humidity in San Tan Valley during April averages 32%. The most humid April was 1983 at 52%, and the least humid was 2018 at 16%.
April receives about 7.2 kWh/m²/day of solar energy in San Tan Valley. The sunniest April was 2008 at 7.8 kWh/m²/day, and the cloudiest was 1984 at 6.3.
Average wind speed in San Tan Valley during April is 2.4 m/s. The windiest Aprils were 1984, 1987 and 1999 at 2.9 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 | 19.1°C | 17.9°C | 19.1°C | 20.2°C | 20.5°C | +1.4°C |
| Avg High | 27.6°C | 26.4°C | 27.6°C | 28.5°C | 29.0°C | +1.4°C |
| Avg Low | 10.5°C | 9.5°C | 10.6°C | 11.9°C | 12.0°C | +1.5°C |
| Avg Rain | 17 mm | 12 mm | 11 mm | 6 mm | 2 mm | -15 mm |
April temperatures in San Tan Valley have risen by about 2.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -0.2°C (1999) to a record high of 39°C (1989).
Rainfall in April is one of the drier months, averaging 10 mm, with a wettest year of 56 mm.
One of the best times to visit San Tan Valley
April is one of the best times to visit San Tan Valley. Expect days averaging 27.7°C and nights around 10.8°C (mean 19.3°C) — cooler than San Tan Valley's yearly average — with low rainfall (10 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 | 28.6°C | 20.4°C | 12.2°C | 37.6°C | 5.5°C | 2 mm | 23% | 2.2 m/s | 7.2 |
| 2024 | 27.3°C | 19.0°C | 10.8°C | 34.6°C | 3.7°C | 5 mm | 35% | 2.2 m/s | 7.4 |
| 2023 | 29.0°C | 20.0°C | 11.0°C | 36.5°C | 2.1°C | 0 mm | 29% | 2.3 m/s | 7.5 |
| 2022 | 30.7°C | 21.8°C | 12.8°C | 36.1°C | 6.2°C | 0 mm | 18% | 2.6 m/s | 7.7 |
| 2021 | 30.1°C | 21.7°C | 13.4°C | 35.4°C | 9.4°C | 2 mm | 19% | 2.5 m/s | 7.3 |
| 2020 | 28.3°C | 20.1°C | 11.9°C | 37.7°C | 6.1°C | 2 mm | 37% | 2.1 m/s | 7.4 |
| 2019 | 28.3°C | 20.4°C | 12.5°C | 35.7°C | 7.9°C | 3 mm | 35% | 2.3 m/s | 7.1 |
| 2018 | 31.1°C | 22.7°C | 14.2°C | 36.0°C | 6.7°C | 0 mm | 16% | 2.4 m/s | 7.3 |
| 2017 | 29.6°C | 21.2°C | 12.8°C | 36.1°C | 5.6°C | 0 mm | 23% | 2.3 m/s | 7.3 |
| 2016 | 27.9°C | 19.9°C | 11.9°C | 35.2°C | 6.5°C | 15 mm | 28% | 2.4 m/s | 7.1 |
| 2015 | 28.0°C | 19.7°C | 11.4°C | 35.1°C | 5.9°C | 10 mm | 27% | 2.4 m/s | 7.3 |
| 2014 | 28.7°C | 20.3°C | 11.8°C | 34.8°C | 5.0°C | 4 mm | 21% | 2.5 m/s | 7.3 |
| 2013 | 28.6°C | 20.0°C | 11.4°C | 36.3°C | 4.6°C | 6 mm | 26% | 2.4 m/s | 7.5 |
| 2012 | 29.0°C | 20.7°C | 12.3°C | 38.3°C | 4.8°C | 7 mm | 23% | 2.2 m/s | 7.2 |
| 2011 | 28.6°C | 19.9°C | 11.2°C | 35.8°C | 2.2°C | 13 mm | 26% | 2.7 m/s | 7.3 |
| 2010 | 25.3°C | 17.3°C | 9.3°C | 31.7°C | 3.7°C | 3 mm | 39% | 2.3 m/s | 7.2 |
| 2009 | 26.7°C | 18.3°C | 9.8°C | 36.0°C | 3.7°C | 12 mm | 29% | 2.7 m/s | 7.3 |
| 2008 | 27.9°C | 18.7°C | 9.5°C | 34.3°C | 4.6°C | 0 mm | 25% | 2.8 m/s | 7.8 |
| 2007 | 27.7°C | 19.3°C | 10.8°C | 35.9°C | 5.2°C | 7 mm | 31% | 2.4 m/s | 7.2 |
| 2006 | 27.5°C | 19.0°C | 10.5°C | 33.1°C | 4.6°C | 2 mm | 30% | 2.1 m/s | 7.1 |
| 2005 | 26.8°C | 18.2°C | 9.5°C | 33.0°C | 5.2°C | 10 mm | 38% | 2.5 m/s | 7.4 |
| 2004 | 26.7°C | 18.9°C | 11.1°C | 33.6°C | 7.7°C | 29 mm | 37% | 2.5 m/s | 7.1 |
| 2003 | 25.9°C | 17.5°C | 9.2°C | 31.7°C | 4.6°C | 7 mm | 32% | 2.7 m/s | 7.4 |
| 2002 | 30.5°C | 22.0°C | 13.6°C | 36.0°C | 7.2°C | 2 mm | 22% | 2.3 m/s | 7.2 |
| 2001 | 26.7°C | 18.4°C | 10.1°C | 35.7°C | 2.4°C | 41 mm | 40% | 2.5 m/s | 6.8 |
| 2000 | 30.0°C | 21.1°C | 12.1°C | 38.0°C | 4.7°C | 1 mm | 24% | 2.4 m/s | 7.6 |
| 1999 | 24.0°C | 15.8°C | 7.7°C | 33.5°C | -0.2°C | 36 mm | 37% | 2.9 m/s | 6.9 |
| 1998 | 23.4°C | 15.2°C | 7.0°C | 33.6°C | 1.5°C | 16 mm | 47% | 2.6 m/s | 7.2 |
| 1997 | 26.4°C | 18.2°C | 10.0°C | 33.4°C | 4.6°C | 10 mm | 32% | 2.6 m/s | 6.8 |
| 1996 | 29.5°C | 20.1°C | 10.7°C | 37.2°C | 6.2°C | 1 mm | 20% | 2.7 m/s | 7.5 |
| 1995 | 25.1°C | 16.6°C | 8.0°C | 31.4°C | 3.3°C | 13 mm | 41% | 2.4 m/s | 6.7 |
| 1994 | 27.3°C | 18.9°C | 10.4°C | 36.1°C | 4.5°C | 14 mm | 34% | 2.5 m/s | 6.8 |
| 1993 | 26.6°C | 18.1°C | 9.6°C | 33.4°C | 4.5°C | 0 mm | 46% | 2.1 m/s | 7.3 |
| 1992 | 28.5°C | 20.0°C | 11.5°C | 36.6°C | 6.8°C | 8 mm | 45% | 1.9 m/s | 7.2 |
| 1991 | 25.7°C | 16.8°C | 8.0°C | 31.2°C | 2.3°C | 0 mm | 39% | 2.3 m/s | 7.5 |
| 1990 | 27.8°C | 19.7°C | 11.6°C | 34.3°C | 7.6°C | 17 mm | 38% | 2.4 m/s | 6.6 |
| 1989 🔥 | 32.1°C | 22.8°C | 13.5°C | 39.0°C | 8.7°C | 0 mm | 22% | 2.3 m/s | 7.3 |
| 1988 🌧️ | 26.7°C | 18.5°C | 10.3°C | 34.0°C | 4.2°C | 56 mm | 38% | 2.4 m/s | 6.5 |
| 1987 | 29.0°C | 20.3°C | 11.5°C | 34.4°C | 4.5°C | 8 mm | 36% | 2.9 m/s | 6.9 |
| 1986 | 27.6°C | 19.2°C | 10.7°C | 33.5°C | 6.1°C | 5 mm | 36% | 2.5 m/s | 6.8 |
| 1985 | 28.7°C | 20.2°C | 11.6°C | 34.4°C | 6.0°C | 16 mm | 39% | 2.4 m/s | 6.8 |
| 1984 | 26.0°C | 17.2°C | 8.5°C | 35.3°C | 3.0°C | 28 mm | 33% | 2.9 m/s | 6.3 |
| 1983 ❄️ | 22.1°C | 14.3°C | 6.5°C | 30.1°C | 1.2°C | 15 mm | 52% | 2.5 m/s | — |
| 1982 | 26.8°C | 18.6°C | 10.4°C | 32.5°C | 4.8°C | 2 mm | 37% | 2.2 m/s | — |
| 1981 | 29.5°C | 20.5°C | 11.5°C | 36.0°C | 3.8°C | 21 mm | 37% | 2.5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 27.7°C with lows near 10.8°C (mean 19.3°C), based on 45 years of NASA POWER data.
April averages 10 mm of rainfall in San Tan Valley, one of the drier months. The wettest on record was 56 mm in 1988.
The hottest April reached 39°C in 1989. The coldest dipped to -0.2°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 2.4°C. Daytime highs moved from 26.6°C to 29.1°C and overnight lows from 9.7°C to 12°C over the same span.
April is one of the cooler months of the year in San Tan Valley and one of the drier months, so plan for around 27.7°C daytime highs and 10.8°C at night.
Not quite — April is the 6th coolest month in San Tan Valley, averaging 19.3°C.
For April in San Tan Valley, pack light layers you can adjust through the day, with typical highs of 27.7°C and lows of 10.8°C.
Relative humidity in April averages 32% — relatively dry.
Average wind speed in April is 2.4 m/s. The windiest April on record averaged 2.9 m/s (1984).
The wettest April on record was 1988 with 56 mm. On average, April sees 10 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
