May is close to Santa Maria's year-round average, with average highs near 19.9°C and lows around 11.1°C (mean 15.5°C). It is one of the drier months, averaging 11 mm of rainfall and 71% relative humidity across the period.
May is close to Santa Maria's year-round average. Across 45 years of records, the warmest May in Santa Maria was 1997 — when the month averaged 18.9°C — while the coldest was 1998 at 13°C. Typical May days reach 19.9°C with nights near 11.1°C. The long-term trend is cooling, about 0.2°C per decade.
May is one of the drier months in Santa Maria, averaging 11 mm of rainfall. The wettest May on record was 1998 with 84 mm, while the driest were 1984 and 2022 at 0 mm.
Relative humidity in Santa Maria during May averages 71%. The most humid May was 2023 at 84%, and the least humid was 1984 at 53%.
May receives about 6.9 kWh/m²/day of solar energy in Santa Maria. The sunniest May was 2004 at 7.9 kWh/m²/day, and the cloudiest was 1992 at 5.9.
Average wind speed in Santa Maria during May is 3.5 m/s. The windiest Mays were 1989, 1999 and 2013, among others at 4.1 m/s, while the calmest was 2001 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 15.3°C | 15.7°C | 15.2°C | 15.3°C | -0.6°C |
| Avg High | 20.7°C | 19.6°C | 20.2°C | 19.3°C | 19.5°C | -1.2°C |
| Avg Low | 11.2°C | 11.0°C | 11.2°C | 11.0°C | 11.1°C | -0.1°C |
| Avg Rain | 4 mm | 16 mm | 15 mm | 13 mm | 4 mm | +0 mm |
May temperatures in Santa Maria have fallen by about 0.7°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 6.4°C (2022) to a record high of 32°C (2014).
Rainfall in May is one of the drier months, averaging 11 mm, with a wettest year of 84 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.3°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A good time to visit Santa Maria
May is a good time to visit Santa Maria, with days averaging 19.9°C and nights around 11.1°C (mean 15.5°C, close to Santa Maria's yearly average) and low rainfall. August and September are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.4°C | 16.0°C | 11.6°C | 26.2°C | 9.8°C | 2 mm | 70% | 3.4 m/s | 7 |
| 2024 | 18.4°C | 14.5°C | 10.5°C | 21.8°C | 7.0°C | 4 mm | 77% | 3 m/s | 6.6 |
| 2023 | 16.9°C | 13.9°C | 10.9°C | 21.8°C | 8.6°C | 12 mm | 84% | 2.7 m/s | 6.1 |
| 2022 | 20.6°C | 15.6°C | 10.6°C | 26.3°C | 6.4°C | 0 mm | 63% | 3.8 m/s | 7.7 |
| 2021 | 20.0°C | 15.3°C | 10.7°C | 24.7°C | 8.7°C | 0 mm | 68% | 3.6 m/s | 6.9 |
| 2020 | 20.8°C | 16.5°C | 12.2°C | 26.2°C | 9.6°C | 5 mm | 70% | 3.2 m/s | 7.4 |
| 2019 | 17.8°C | 14.5°C | 11.2°C | 21.4°C | 9.9°C | 50 mm | 80% | 3.1 m/s | 6.2 |
| 2018 | 18.7°C | 14.9°C | 11.0°C | 22.7°C | 9.2°C | 7 mm | 76% | 3.1 m/s | 6.6 |
| 2017 | 19.4°C | 15.4°C | 11.4°C | 24.2°C | 8.0°C | 14 mm | 75% | 3.1 m/s | 6.7 |
| 2016 | 19.1°C | 15.3°C | 11.5°C | 24.0°C | 9.7°C | 8 mm | 77% | 2.8 m/s | 6.3 |
| 2015 | 18.3°C | 14.6°C | 11.0°C | 22.2°C | 8.9°C | 9 mm | 74% | 3.3 m/s | 6.6 |
| 2014 | 22.0°C | 17.2°C | 12.4°C | 32.0°C | 9.0°C | 3 mm | 60% | 3.5 m/s | 7.7 |
| 2013 | 21.2°C | 16.3°C | 11.4°C | 25.7°C | 8.2°C | 11 mm | 65% | 4.1 m/s | 7.4 |
| 2012 | 20.3°C | 15.4°C | 10.5°C | 24.9°C | 8.6°C | 2 mm | 67% | 3.6 m/s | 7.5 |
| 2011 | 17.9°C | 13.8°C | 9.8°C | 25.9°C | 7.7°C | 21 mm | 74% | 3.8 m/s | 7.5 |
| 2010 | 18.3°C | 14.1°C | 9.8°C | 24.3°C | 7.6°C | 8 mm | 72% | 3.7 m/s | 7.5 |
| 2009 | 21.2°C | 16.4°C | 11.5°C | 26.6°C | 9.1°C | 6 mm | 67% | 3.2 m/s | 6.3 |
| 2008 | 19.4°C | 15.0°C | 10.5°C | 28.5°C | 7.4°C | 8 mm | 69% | 3.5 m/s | 7 |
| 2007 | 19.9°C | 15.2°C | 10.4°C | 26.0°C | 8.0°C | 7 mm | 66% | 3.3 m/s | 6.5 |
| 2006 | 19.7°C | 15.6°C | 11.5°C | 24.9°C | 8.4°C | 30 mm | 76% | 2.9 m/s | 6.5 |
| 2005 | 20.0°C | 15.9°C | 11.9°C | 25.6°C | 9.2°C | 39 mm | 78% | 3.3 m/s | 7.3 |
| 2004 | 20.9°C | 16.2°C | 11.5°C | 28.6°C | 8.5°C | 7 mm | 67% | 3.7 m/s | 7.9 |
| 2003 | 19.4°C | 15.1°C | 10.9°C | 26.5°C | 7.4°C | 38 mm | 72% | 3.4 m/s | 7 |
| 2002 | 19.4°C | 14.8°C | 10.1°C | 26.5°C | 7.9°C | 7 mm | 71% | 3.6 m/s | 7 |
| 2001 | 21.9°C | 17.3°C | 12.6°C | 26.2°C | 9.8°C | 4 mm | 68% | 2.4 m/s | 6.6 |
| 2000 | 20.4°C | 15.9°C | 11.4°C | 26.9°C | 7.5°C | 4 mm | 71% | 3.5 m/s | 7.4 |
| 1999 | 18.4°C | 13.8°C | 9.2°C | 22.3°C | 6.6°C | 1 mm | 73% | 4.1 m/s | 6.9 |
| 1998 ❄️ 🌧️ | 16.1°C | 13.0°C | 10.0°C | 18.5°C | 8.5°C | 84 mm | 84% | 3.8 m/s | 7.1 |
| 1997 🔥 | 24.1°C | 18.9°C | 13.7°C | 28.2°C | 9.4°C | 0 mm | 61% | 3.5 m/s | 7.2 |
| 1996 | 21.4°C | 16.6°C | 11.8°C | 28.3°C | 8.7°C | 12 mm | 67% | 3.7 m/s | 7.3 |
| 1995 | 16.8°C | 13.6°C | 10.4°C | 23.3°C | 9.0°C | 20 mm | 83% | 3.4 m/s | 6 |
| 1994 | 19.2°C | 14.9°C | 10.6°C | 23.8°C | 7.9°C | 20 mm | 74% | 3.4 m/s | 6.5 |
| 1993 | 19.8°C | 15.6°C | 11.4°C | 23.3°C | 8.2°C | 5 mm | 76% | 3 m/s | 7.3 |
| 1992 | 22.1°C | 17.7°C | 13.2°C | 24.4°C | 10.4°C | 1 mm | 74% | 2.8 m/s | 5.9 |
| 1991 | 18.0°C | 13.5°C | 9.1°C | 22.7°C | 7.3°C | 1 mm | 73% | 4 m/s | 7.2 |
| 1990 | 19.8°C | 15.3°C | 10.8°C | 26.4°C | 8.9°C | 17 mm | 69% | 3.5 m/s | 6.8 |
| 1989 | 20.9°C | 16.0°C | 11.0°C | 26.2°C | 9.1°C | 5 mm | 66% | 4.1 m/s | 6.9 |
| 1988 | 20.3°C | 15.5°C | 10.7°C | 25.3°C | 7.0°C | 4 mm | 66% | 4.1 m/s | 7.2 |
| 1987 | 21.6°C | 17.1°C | 12.7°C | 27.9°C | 9.6°C | 3 mm | 64% | 3.5 m/s | 6.2 |
| 1986 | 20.7°C | 15.9°C | 11.1°C | 25.6°C | 7.7°C | 0 mm | 66% | 3.4 m/s | 6.6 |
| 1985 | 19.8°C | 15.1°C | 10.4°C | 25.2°C | 7.8°C | 1 mm | 64% | 3.8 m/s | 6.7 |
| 1984 | 23.3°C | 17.8°C | 12.4°C | 27.6°C | 7.8°C | 0 mm | 53% | 4.1 m/s | 7.1 |
| 1983 | 19.4°C | 15.1°C | 10.8°C | 24.0°C | 7.5°C | 4 mm | 77% | 3.6 m/s | — |
| 1982 | 19.6°C | 15.2°C | 10.8°C | 24.0°C | 7.9°C | 15 mm | 73% | 3 m/s | — |
| 1981 | 20.8°C | 15.8°C | 10.8°C | 26.1°C | 8.2°C | 0 mm | 66% | 3.9 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 19.9°C with lows near 11.1°C (mean 15.5°C), based on 45 years of NASA POWER data.
May averages 11 mm of rainfall in Santa Maria, one of the drier months. The wettest on record was 84 mm in 1998.
The hottest May reached 32°C in 2014. The coldest dipped to 6.4°C in 2022.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have fallen by about 0.7°C. Daytime highs moved from 20.6°C to 19.3°C and overnight lows from 11°C to 10.9°C over the same span.
May is close to Santa Maria's year-round average and one of the drier months, so plan for around 19.9°C daytime highs and 11.1°C at night.
Not quite — May is the 7th coolest month in Santa Maria, averaging 15.5°C.
For May in Santa Maria, pack light layers you can adjust through the day, with typical highs of 19.9°C and lows of 11.1°C.
Relative humidity in May averages 71% — moderately humid.
Average wind speed in May is 3.5 m/s. The windiest May on record averaged 4.1 m/s (1984).
The wettest May on record was 1998 with 84 mm. On average, May sees 11 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 May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
