May is one of the warmer months of the year in Deltona, with average highs near 31.3°C and lows around 19.8°C (mean 25.6°C). It is one of the drier months, averaging 89 mm of rainfall and 68% relative humidity across the period.
May is one of the warmer months of the year in Deltona. Across 45 years of records, the warmest May in Deltona was 2024 — when the month averaged 28.3°C — while the coldest was 2013 at 23.1°C. Typical May days reach 31.3°C with nights near 19.8°C. The long-term trend is warming, about 0.3°C per decade.
May is one of the drier months in Deltona, averaging 89 mm of rainfall. The wettest May on record was 2009 with 419 mm, while the driest was 2000 at 16 mm.
Relative humidity in Deltona during May averages 68%. The most humid May was 1991 at 83%, and the least humid was 1981 at 55%.
May receives about 6.5 kWh/m²/day of solar energy in Deltona. The sunniest May was 2011 at 7.1 kWh/m²/day, and the cloudiest was 2018 at 5.2.
Average wind speed in Deltona during May is 2.1 m/s. The windiest May was 2007 at 2.7 m/s, while the calmest was 2025 at 1.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.7°C | 25.5°C | 25.8°C | 25.5°C | 26.5°C | +1.8°C |
| Avg High | 30.5°C | 31.1°C | 31.7°C | 31.1°C | 32.4°C | +1.9°C |
| Avg Low | 19.0°C | 19.9°C | 19.9°C | 20.0°C | 20.7°C | +1.7°C |
| Avg Rain | 80 mm | 78 mm | 88 mm | 111 mm | 87 mm | +8 mm |
May temperatures in Deltona have risen by about 2.1°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 9°C (1992) to a record high of 38.9°C (2019).
Rainfall in May is one of the drier months, averaging 89 mm, with a wettest year of 419 mm.
A good time to visit Deltona
May is a good time to visit Deltona, with days averaging 31.3°C and nights around 19.8°C (mean 25.6°C, warmer than Deltona's yearly average) and higher rainfall. April and October 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 | 33.3°C | 27.5°C | 21.7°C | 36.8°C | 18.0°C | 175 mm | 68% | 1.6 m/s | 6.2 |
| 2024 🔥 | 34.5°C | 28.3°C | 22.0°C | 38.8°C | 19.4°C | 50 mm | 65% | 1.9 m/s | 6.7 |
| 2023 | 30.9°C | 25.3°C | 19.7°C | 34.9°C | 14.2°C | 83 mm | 69% | 1.9 m/s | 6.6 |
| 2022 | 32.2°C | 26.5°C | 20.9°C | 35.7°C | 16.4°C | 70 mm | 70% | 1.9 m/s | 6.6 |
| 2021 | 31.9°C | 26.0°C | 20.2°C | 36.3°C | 14.3°C | 39 mm | 62% | 2.2 m/s | 7 |
| 2020 | 31.3°C | 25.5°C | 19.6°C | 36.1°C | 13.2°C | 108 mm | 67% | 2.2 m/s | 6.5 |
| 2019 | 32.7°C | 26.8°C | 20.9°C | 38.9°C | 18.4°C | 82 mm | 69% | 1.9 m/s | 6.7 |
| 2018 | 28.3°C | 24.2°C | 20.1°C | 33.1°C | 16.5°C | 263 mm | 81% | 2 m/s | 5.2 |
| 2017 | 33.5°C | 26.8°C | 20.1°C | 38.0°C | 13.0°C | 75 mm | 62% | 2.3 m/s | 6.8 |
| 2016 | 31.1°C | 25.3°C | 19.5°C | 34.2°C | 12.0°C | 149 mm | 67% | 1.9 m/s | 6.7 |
| 2015 | 31.2°C | 25.8°C | 20.4°C | 35.1°C | 14.2°C | 49 mm | 69% | 2 m/s | 6.8 |
| 2014 | 30.1°C | 24.7°C | 19.3°C | 36.1°C | 12.8°C | 106 mm | 73% | 1.9 m/s | 6.5 |
| 2013 ❄️ | 27.9°C | 23.1°C | 18.2°C | 32.2°C | 11.0°C | 168 mm | 76% | 2.1 m/s | 6.4 |
| 2012 | 32.1°C | 26.4°C | 20.8°C | 36.2°C | 17.1°C | 105 mm | 68% | 2 m/s | 6.2 |
| 2011 | 32.9°C | 26.1°C | 19.4°C | 37.2°C | 13.7°C | 28 mm | 63% | 2.1 m/s | 7.1 |
| 2010 | 31.5°C | 26.1°C | 20.8°C | 34.2°C | 17.6°C | 89 mm | 73% | 2 m/s | 6.6 |
| 2009 🌧️ | 30.1°C | 25.5°C | 20.9°C | 38.4°C | 17.8°C | 419 mm | 76% | 1.9 m/s | 5.8 |
| 2008 | 32.1°C | 26.0°C | 20.0°C | 35.9°C | 14.5°C | 26 mm | 64% | 2.5 m/s | 6.7 |
| 2007 | 30.2°C | 24.8°C | 19.4°C | 33.9°C | 14.4°C | 37 mm | 64% | 2.7 m/s | 6.4 |
| 2006 | 33.2°C | 26.3°C | 19.4°C | 37.4°C | 13.8°C | 38 mm | 59% | 2 m/s | 6.6 |
| 2005 | 29.4°C | 24.0°C | 18.5°C | 33.6°C | 13.6°C | 137 mm | 73% | 1.8 m/s | 6.1 |
| 2004 | 31.8°C | 25.7°C | 19.6°C | 37.8°C | 13.0°C | 50 mm | 66% | 2.2 m/s | 6.9 |
| 2003 | 32.2°C | 26.8°C | 21.4°C | 35.5°C | 18.2°C | 54 mm | 69% | 1.8 m/s | 6.4 |
| 2002 | 32.3°C | 26.4°C | 20.6°C | 38.3°C | 18.0°C | 47 mm | 64% | 2.5 m/s | 6.6 |
| 2001 | 31.7°C | 25.6°C | 19.5°C | 36.7°C | 16.7°C | 57 mm | 63% | 2.1 m/s | 6.6 |
| 2000 | 33.6°C | 26.8°C | 20.0°C | 38.8°C | 15.6°C | 16 mm | 58% | 2.2 m/s | 6.9 |
| 1999 | 30.6°C | 24.8°C | 18.9°C | 35.0°C | 10.6°C | 83 mm | 67% | 2.2 m/s | 6.4 |
| 1998 | 32.6°C | 26.3°C | 19.9°C | 37.9°C | 15.0°C | 28 mm | 67% | 2.1 m/s | 6.6 |
| 1997 | 30.1°C | 24.9°C | 19.8°C | 33.9°C | 14.5°C | 88 mm | 70% | 2 m/s | 6.3 |
| 1996 | 31.2°C | 25.6°C | 20.0°C | 34.7°C | 13.6°C | 68 mm | 72% | 2 m/s | 6.4 |
| 1995 | 33.2°C | 27.3°C | 21.4°C | 37.9°C | 17.5°C | 66 mm | 66% | 2.1 m/s | 6.8 |
| 1994 | 31.1°C | 25.5°C | 19.9°C | 35.8°C | 13.8°C | 76 mm | 66% | 1.8 m/s | 6.5 |
| 1993 | 30.4°C | 24.6°C | 18.7°C | 35.4°C | 15.7°C | 66 mm | 65% | 2.2 m/s | 6.1 |
| 1992 | 30.1°C | 24.0°C | 17.8°C | 35.0°C | 9.0°C | 76 mm | 66% | 2 m/s | 6.7 |
| 1991 | 29.0°C | 25.3°C | 21.5°C | 31.6°C | 17.6°C | 196 mm | 83% | 1.8 m/s | 5.7 |
| 1990 | 32.6°C | 26.7°C | 20.8°C | 36.5°C | 17.2°C | 33 mm | 64% | 2.3 m/s | 6.3 |
| 1989 | 32.1°C | 25.7°C | 19.3°C | 37.0°C | 12.2°C | 55 mm | 62% | 2.1 m/s | 6.8 |
| 1988 | 30.0°C | 24.0°C | 18.0°C | 36.9°C | 12.9°C | 78 mm | 64% | 2.1 m/s | 6.1 |
| 1987 | 29.0°C | 24.3°C | 19.6°C | 32.2°C | 14.1°C | 71 mm | 74% | 2 m/s | 6.2 |
| 1986 | 31.9°C | 25.5°C | 19.1°C | 36.9°C | 15.2°C | 42 mm | 61% | 2.2 m/s | 6.6 |
| 1985 | 31.9°C | 25.7°C | 19.4°C | 37.2°C | 16.0°C | 70 mm | 61% | 2 m/s | 6.7 |
| 1984 | 29.2°C | 24.2°C | 19.2°C | 34.3°C | 12.8°C | 145 mm | 71% | 2 m/s | 5.8 |
| 1983 | 28.6°C | 23.4°C | 18.3°C | 32.8°C | 12.2°C | 64 mm | 75% | 1.9 m/s | — |
| 1982 | 28.5°C | 23.6°C | 18.7°C | 32.5°C | 14.3°C | 130 mm | 74% | 1.8 m/s | — |
| 1981 | 33.6°C | 26.3°C | 19.1°C | 38.4°C | 14.3°C | 60 mm | 55% | 2.3 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 31.3°C with lows near 19.8°C (mean 25.6°C), based on 45 years of NASA POWER data.
May averages 89 mm of rainfall in Deltona, one of the drier months. The wettest on record was 419 mm in 2009.
The hottest May reached 38.9°C in 2019. The coldest dipped to 9°C in 1992.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.1°C. Daytime highs moved from 30.4°C to 32.6°C and overnight lows from 18.9°C to 20.9°C over the same span.
May is one of the warmer months of the year in Deltona and one of the drier months, so plan for around 31.3°C daytime highs and 19.8°C at night.
Not quite — May is the 8th coolest month in Deltona, averaging 25.6°C.
For May in Deltona, pack light, breathable clothing and sun protection, with typical highs of 31.3°C and lows of 19.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 68% — moderately humid.
Average wind speed in May is 2.1 m/s. The windiest May on record averaged 2.7 m/s (2007).
The wettest May on record was 2009 with 419 mm. On average, May sees 89 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 Deltona 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.
