May is one of the warmer months of the year in Tracy, with average highs near 26.3°C and lows around 9.5°C (mean 17.9°C). It is one of the drier months, averaging 15 mm of rainfall and 60% relative humidity across the period.
May is one of the warmer months of the year in Tracy. Across 45 years of records, the warmest May in Tracy was 2001 — when the month averaged 22°C — while the coldest was 1998 at 12.9°C. Typical May days reach 26.3°C with nights near 9.5°C. The long-term trend is warming, about 0.2°C per decade.
May is one of the drier months in Tracy, averaging 15 mm of rainfall. The wettest May on record was 1998 with 83 mm, while the driest were 1992 and 2021 at 0 mm.
Relative humidity in Tracy during May averages 60%. The most humid May was 1998 at 80%, and the least humid was 2001 at 47%.
May receives about 7.4 kWh/m²/day of solar energy in Tracy. The sunniest May was 2021 at 8.3 kWh/m²/day, and the cloudiest was 1998 at 5.9.
Average wind speed in Tracy during May is 2.9 m/s. The windiest May was 1984 at 3.5 m/s, while the calmest were 1995 and 1998 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.6°C | 17.3°C | 18.6°C | 17.5°C | 18.9°C | +1.3°C |
| Avg High | 26.1°C | 25.2°C | 27.4°C | 25.7°C | 27.8°C | +1.7°C |
| Avg Low | 9.1°C | 9.3°C | 9.8°C | 9.3°C | 10.0°C | +0.9°C |
| Avg Rain | 5 mm | 30 mm | 14 mm | 13 mm | 8 mm | +4 mm |
May temperatures in Tracy have risen by about 1.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 3.4°C (1983) to a record high of 42.4°C (2001).
Rainfall in May is one of the drier months, averaging 15 mm, with a wettest year of 83 mm.
A good time to visit Tracy
May is a good time to visit Tracy, with days averaging 26.3°C and nights around 9.5°C (mean 17.9°C, warmer than Tracy's yearly average) and low rainfall. June 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 | 29.0°C | 19.7°C | 10.4°C | 41.7°C | 8.0°C | 2 mm | 54% | 3.2 m/s | 8 |
| 2024 | 27.4°C | 18.4°C | 9.4°C | 35.2°C | 5.1°C | 18 mm | 59% | 3 m/s | 8 |
| 2023 | 24.0°C | 16.6°C | 9.3°C | 31.9°C | 6.2°C | 15 mm | 71% | 2.4 m/s | 6.9 |
| 2022 | 27.5°C | 18.6°C | 9.8°C | 38.6°C | 4.0°C | 0 mm | 52% | 3.4 m/s | 8 |
| 2021 | 29.7°C | 19.8°C | 9.9°C | 40.6°C | 6.7°C | 0 mm | 48% | 3.4 m/s | 8.3 |
| 2020 | 29.0°C | 20.1°C | 11.1°C | 40.5°C | 5.8°C | 13 mm | 53% | 2.7 m/s | 7.5 |
| 2019 | 23.8°C | 16.3°C | 8.8°C | 29.6°C | 6.3°C | 55 mm | 68% | 2.7 m/s | 6.7 |
| 2018 | 26.4°C | 18.1°C | 9.8°C | 37.0°C | 7.3°C | 3 mm | 61% | 3 m/s | 7.4 |
| 2017 | 26.2°C | 18.3°C | 10.4°C | 35.3°C | 6.5°C | 3 mm | 64% | 2.8 m/s | 7.7 |
| 2016 | 26.2°C | 18.3°C | 10.3°C | 36.5°C | 7.9°C | 11 mm | 64% | 2.6 m/s | 7 |
| 2015 | 25.7°C | 17.5°C | 9.3°C | 35.2°C | 6.6°C | 11 mm | 60% | 2.8 m/s | 7.2 |
| 2014 | 28.5°C | 19.7°C | 10.9°C | 36.7°C | 7.3°C | 1 mm | 50% | 3 m/s | 7.9 |
| 2013 | 28.4°C | 19.4°C | 10.3°C | 36.8°C | 6.6°C | 2 mm | 51% | 3.2 m/s | 7.6 |
| 2012 | 27.7°C | 18.4°C | 9.0°C | 36.0°C | 6.2°C | 1 mm | 55% | 3.1 m/s | 8 |
| 2011 | 21.8°C | 14.6°C | 7.5°C | 32.2°C | 5.4°C | 24 mm | 67% | 3 m/s | 7 |
| 2010 | 21.9°C | 14.5°C | 7.1°C | 30.2°C | 4.1°C | 20 mm | 69% | 3 m/s | 7 |
| 2009 | 29.3°C | 20.0°C | 10.6°C | 40.0°C | 7.0°C | 16 mm | 58% | 2.9 m/s | 7.4 |
| 2008 | 27.2°C | 18.4°C | 9.5°C | 39.9°C | 5.2°C | 2 mm | 55% | 3.1 m/s | 7.5 |
| 2007 | 28.2°C | 18.8°C | 9.3°C | 35.2°C | 5.3°C | 4 mm | 52% | 3 m/s | 7.8 |
| 2006 | 25.9°C | 17.8°C | 9.7°C | 34.1°C | 7.5°C | 18 mm | 68% | 2.6 m/s | 7.8 |
| 2005 | 24.8°C | 17.3°C | 9.8°C | 34.3°C | 5.2°C | 30 mm | 70% | 2.7 m/s | 6.9 |
| 2004 | 27.8°C | 18.8°C | 9.9°C | 36.7°C | 7.3°C | 3 mm | 57% | 3.1 m/s | 7.9 |
| 2003 | 25.5°C | 17.5°C | 9.4°C | 38.5°C | 4.5°C | 23 mm | 64% | 2.7 m/s | 7.3 |
| 2002 | 26.3°C | 17.4°C | 8.5°C | 36.7°C | 5.4°C | 18 mm | 60% | 2.9 m/s | 7.8 |
| 2001 🔥 | 32.3°C | 22.0°C | 11.7°C | 42.4°C | 7.4°C | 0 mm | 47% | 2.8 m/s | 8.1 |
| 2000 | 26.2°C | 18.1°C | 9.9°C | 38.2°C | 4.5°C | 22 mm | 63% | 3 m/s | 7.1 |
| 1999 | 25.1°C | 16.3°C | 7.5°C | 33.5°C | 4.8°C | 7 mm | 63% | 3.3 m/s | 7.9 |
| 1998 ❄️ 🌧️ | 18.3°C | 12.9°C | 7.6°C | 25.0°C | 3.7°C | 83 mm | 80% | 2.3 m/s | 5.9 |
| 1997 | 30.8°C | 21.4°C | 11.9°C | 37.2°C | 5.8°C | 7 mm | 54% | 3 m/s | 7.9 |
| 1996 | 25.2°C | 17.4°C | 9.6°C | 33.4°C | 5.7°C | 52 mm | 64% | 2.9 m/s | 7.4 |
| 1995 | 21.6°C | 15.1°C | 8.6°C | 30.7°C | 6.6°C | 27 mm | 76% | 2.3 m/s | 7 |
| 1994 | 25.6°C | 17.5°C | 9.4°C | 35.8°C | 6.9°C | 35 mm | 63% | 2.6 m/s | 6.7 |
| 1993 | 24.7°C | 17.1°C | 9.5°C | 30.3°C | 5.0°C | 25 mm | 67% | 2.6 m/s | 6.7 |
| 1992 | 30.7°C | 21.3°C | 12.0°C | 36.7°C | 8.7°C | 0 mm | 55% | 2.8 m/s | 7.7 |
| 1991 | 23.9°C | 15.9°C | 7.8°C | 32.3°C | 5.2°C | 7 mm | 61% | 3.1 m/s | 7.3 |
| 1990 | 26.0°C | 17.7°C | 9.4°C | 34.9°C | 6.8°C | 61 mm | 57% | 2.8 m/s | 7.2 |
| 1989 | 25.7°C | 17.5°C | 9.3°C | 31.4°C | 6.4°C | 3 mm | 60% | 3.1 m/s | 7.6 |
| 1988 | 25.5°C | 17.0°C | 8.5°C | 35.9°C | 3.8°C | 16 mm | 57% | 3.1 m/s | 7 |
| 1987 | 28.9°C | 20.0°C | 11.2°C | 37.0°C | 6.9°C | 2 mm | 54% | 2.9 m/s | 7.2 |
| 1986 | 25.6°C | 17.1°C | 8.6°C | 35.5°C | 4.2°C | 7 mm | 63% | 2.7 m/s | 7.2 |
| 1985 | 26.1°C | 17.1°C | 8.2°C | 31.0°C | 5.8°C | 3 mm | 56% | 3 m/s | 7.8 |
| 1984 | 28.9°C | 19.7°C | 10.4°C | 40.5°C | 5.4°C | 1 mm | 52% | 3.5 m/s | 7.8 |
| 1983 | 22.3°C | 15.2°C | 8.1°C | 30.6°C | 3.4°C | 6 mm | 74% | 2.6 m/s | — |
| 1982 | 25.2°C | 16.8°C | 8.4°C | 35.6°C | 5.2°C | 0 mm | 68% | 2.5 m/s | — |
| 1981 | 26.9°C | 18.1°C | 9.3°C | 33.9°C | 5.5°C | 4 mm | 57% | 3.4 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 26.3°C with lows near 9.5°C (mean 17.9°C), based on 45 years of NASA POWER data.
May averages 15 mm of rainfall in Tracy, one of the drier months. The wettest on record was 83 mm in 1998.
The hottest May reached 42.4°C in 2001. The coldest dipped to 3.4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 1.2°C. Daytime highs moved from 25.9°C to 27.5°C and overnight lows from 8.9°C to 9.8°C over the same span.
May is one of the warmer months of the year in Tracy and one of the drier months, so plan for around 26.3°C daytime highs and 9.5°C at night.
Not quite — May is the 7th coolest month in Tracy, averaging 17.9°C.
For May in Tracy, pack light layers you can adjust through the day, with typical highs of 26.3°C and lows of 9.5°C.
Relative humidity in May averages 60% — moderately humid.
Average wind speed in May is 2.9 m/s. The windiest May on record averaged 3.5 m/s (1984).
The wettest May on record was 1998 with 83 mm. On average, May sees 15 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 Tracy 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.
