December is one of the cooler months of the year in Saint Augustine, with average highs near 19.6°C and lows around 14.3°C (mean 17°C). It is one of the drier months, averaging 83 mm of rainfall and 80% relative humidity across the period.
December is one of the cooler months of the year in Saint Augustine. Across 45 years of records, the warmest December in Saint Augustine was 2015 — when the month averaged 20.8°C — while the coldest was 2010 at 12.3°C. Typical December days reach 19.6°C with nights near 14.3°C. The long-term December temperature trend is broadly flat.
December is one of the drier months in Saint Augustine, averaging 83 mm of rainfall. The wettest December on record was 1997 with 325 mm, while the driest was 1984 at 13 mm.
Relative humidity in Saint Augustine during December averages 80%. The most humid December was 2021 at 88%, and the least humid was 2010 at 68%.
December receives about 2.9 kWh/m²/day of solar energy in Saint Augustine. The sunniest December was 2010 at 3.3 kWh/m²/day, and the cloudiest were 1986 and 2009 at 2.3.
Average wind speed in Saint Augustine during December is 2.8 m/s. The windiest December was 2010 at 3.4 m/s, while the calmest was 1984 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.4°C | 17.4°C | 16.7°C | 17.3°C | 17.1°C | +0.7°C |
| Avg High | 19.0°C | 19.9°C | 19.3°C | 20.0°C | 19.8°C | +0.8°C |
| Avg Low | 13.8°C | 14.8°C | 14.0°C | 14.6°C | 14.3°C | +0.5°C |
| Avg Rain | 100 mm | 79 mm | 97 mm | 70 mm | 66 mm | -34 mm |
December temperatures in Saint Augustine have risen by about 0.9°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -2.5°C (1983) to a record high of 26.4°C (2016).
Rainfall in December is one of the drier months, averaging 83 mm, with a wettest year of 325 mm.
A good time to visit Saint Augustine
December is a good time to visit Saint Augustine, with days averaging 19.6°C and nights around 14.3°C (mean 17°C, cooler than Saint Augustine's yearly average) and higher rainfall. April and November are marginally more temperate, but December still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 20.3°C | 17.2°C | 14.2°C | 24.6°C | 6.1°C | 69 mm | 79% | 2.4 m/s | — |
| 2024 | 19.5°C | 17.1°C | 14.6°C | 23.5°C | 10.0°C | 45 mm | 79% | 2.6 m/s | 2.9 |
| 2023 | 19.3°C | 17.1°C | 15.0°C | 24.7°C | 8.3°C | 112 mm | 81% | 2.8 m/s | 2.7 |
| 2022 | 19.6°C | 16.8°C | 14.0°C | 25.5°C | 1.0°C | 28 mm | 79% | 2.3 m/s | 2.9 |
| 2021 | 21.9°C | 19.1°C | 16.2°C | 25.1°C | 10.0°C | 79 mm | 88% | 2.1 m/s | 3.1 |
| 2020 | 18.1°C | 15.0°C | 11.8°C | 23.5°C | 4.1°C | 62 mm | 78% | 2.6 m/s | 3.1 |
| 2019 | 20.7°C | 18.1°C | 15.5°C | 24.9°C | 7.6°C | 109 mm | 81% | 2.7 m/s | 2.8 |
| 2018 | 18.9°C | 16.3°C | 13.8°C | 24.8°C | 7.8°C | 200 mm | 84% | 2.5 m/s | 2.7 |
| 2017 | 19.0°C | 16.3°C | 13.5°C | 23.5°C | 6.3°C | 36 mm | 84% | 2.5 m/s | 3 |
| 2016 | 21.5°C | 18.7°C | 15.9°C | 26.4°C | 10.2°C | 32 mm | 79% | 2.3 m/s | 3.1 |
| 2015 🔥 | 22.9°C | 20.8°C | 18.7°C | 25.5°C | 11.7°C | 40 mm | 87% | 2.2 m/s | 2.8 |
| 2014 | 19.4°C | 16.9°C | 14.4°C | 23.8°C | 8.4°C | 67 mm | 83% | 2.3 m/s | 2.9 |
| 2013 | 21.0°C | 18.2°C | 15.4°C | 25.9°C | 9.3°C | 56 mm | 82% | 2.3 m/s | 3.1 |
| 2012 | 20.3°C | 17.2°C | 14.2°C | 24.5°C | 6.2°C | 71 mm | 81% | 2.5 m/s | 2.8 |
| 2011 | 20.8°C | 18.2°C | 15.6°C | 24.6°C | 9.4°C | 68 mm | 79% | 2.7 m/s | 3 |
| 2010 ❄️ | 15.9°C | 12.3°C | 8.8°C | 22.1°C | 1.1°C | 16 mm | 68% | 3.4 m/s | 3.3 |
| 2009 | 18.9°C | 16.6°C | 14.2°C | 24.9°C | 7.1°C | 199 mm | 83% | 3.1 m/s | 2.3 |
| 2008 | 20.0°C | 17.2°C | 14.3°C | 24.0°C | 8.2°C | 26 mm | 81% | 2.5 m/s | 3.2 |
| 2007 | 21.0°C | 18.3°C | 15.6°C | 25.0°C | 6.1°C | 83 mm | 83% | 2.2 m/s | 3.2 |
| 2006 | 20.9°C | 18.7°C | 16.4°C | 25.9°C | 8.7°C | 119 mm | 82% | 2.5 m/s | 2.7 |
| 2005 | 17.7°C | 15.0°C | 12.4°C | 22.5°C | 8.4°C | 133 mm | 77% | 3.3 m/s | 2.9 |
| 2004 | 18.3°C | 15.6°C | 12.9°C | 24.7°C | 2.7°C | 76 mm | 79% | 3.1 m/s | 2.7 |
| 2003 | 18.7°C | 15.7°C | 12.8°C | 23.7°C | 7.2°C | 38 mm | 73% | 3.1 m/s | 3.2 |
| 2002 | 18.1°C | 15.3°C | 12.5°C | 23.6°C | 7.7°C | 215 mm | 79% | 3 m/s | 2.9 |
| 2001 | 21.0°C | 18.8°C | 16.6°C | 25.1°C | 6.9°C | 36 mm | 80% | 2.6 m/s | 3 |
| 2000 | 17.9°C | 15.3°C | 12.6°C | 25.4°C | 1.0°C | 45 mm | 77% | 3 m/s | 3 |
| 1999 | 19.2°C | 16.5°C | 13.9°C | 24.4°C | 6.9°C | 66 mm | 75% | 2.9 m/s | 3 |
| 1998 | 22.4°C | 19.6°C | 16.9°C | 26.3°C | 9.6°C | 34 mm | 81% | 2.6 m/s | 2.9 |
| 1997 🌧️ | 18.3°C | 15.8°C | 13.2°C | 24.2°C | 6.2°C | 325 mm | 84% | 3.2 m/s | 2.5 |
| 1996 | 19.8°C | 17.3°C | 14.7°C | 23.8°C | 3.5°C | 45 mm | 78% | 2.9 m/s | 2.9 |
| 1995 | 18.4°C | 15.8°C | 13.3°C | 23.7°C | 4.4°C | 47 mm | 78% | 2.9 m/s | 2.9 |
| 1994 | 20.2°C | 18.3°C | 16.3°C | 24.7°C | 9.9°C | 100 mm | 85% | 3 m/s | 2.7 |
| 1993 | 18.2°C | 15.6°C | 12.9°C | 24.3°C | 6.4°C | 60 mm | 76% | 3.3 m/s | 2.8 |
| 1992 | 20.0°C | 17.9°C | 15.7°C | 23.5°C | 8.3°C | 38 mm | 83% | 3.1 m/s | 2.7 |
| 1991 | 20.6°C | 18.1°C | 15.6°C | 26.0°C | 9.9°C | 41 mm | 77% | 2.7 m/s | 2.9 |
| 1990 | 21.5°C | 18.7°C | 15.9°C | 25.5°C | 9.1°C | 31 mm | 80% | 2.4 m/s | 3 |
| 1989 | 15.8°C | 12.8°C | 9.8°C | 22.5°C | -1.2°C | 126 mm | 79% | 3.1 m/s | 2.8 |
| 1988 | 18.2°C | 15.8°C | 13.3°C | 23.1°C | 5.4°C | 33 mm | 79% | 2.7 m/s | 3 |
| 1987 | 20.3°C | 17.5°C | 14.8°C | 24.0°C | 7.5°C | 31 mm | 78% | 2.9 m/s | 2.9 |
| 1986 | 20.5°C | 18.5°C | 16.5°C | 25.7°C | 12.2°C | 130 mm | 82% | 3.2 m/s | 2.3 |
| 1985 | 17.7°C | 14.9°C | 12.1°C | 25.8°C | 0.1°C | 57 mm | 74% | 3.1 m/s | 3.1 |
| 1984 | 21.5°C | 18.8°C | 16.2°C | 25.0°C | 5.2°C | 13 mm | 80% | 2 m/s | 2.8 |
| 1983 | 18.1°C | 15.4°C | 12.6°C | 24.8°C | -2.5°C | 226 mm | 82% | 3.2 m/s | — |
| 1982 | 20.7°C | 18.7°C | 16.6°C | 24.5°C | 8.2°C | 108 mm | 82% | 3 m/s | — |
| 1981 | 18.0°C | 15.4°C | 12.7°C | 23.7°C | 2.7°C | 174 mm | 77% | 3.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 19.6°C with lows near 14.3°C (mean 17°C), based on 45 years of NASA POWER data.
December averages 83 mm of rainfall in Saint Augustine, one of the drier months. The wettest on record was 325 mm in 1997.
The hottest December reached 26.4°C in 2016. The coldest dipped to -2.5°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.9°C. Daytime highs moved from 19.2°C to 20.1°C and overnight lows from 14°C to 14.8°C over the same span.
December is one of the cooler months of the year in Saint Augustine and one of the drier months, so plan for around 19.6°C daytime highs and 14.3°C at night.
Not quite — December is the 3rd coolest month in Saint Augustine, averaging 17°C.
For December in Saint Augustine, pack light layers you can adjust through the day, with typical highs of 19.6°C and lows of 14.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 80% — quite humid.
Average wind speed in December is 2.8 m/s. The windiest December on record averaged 3.4 m/s (2010).
The wettest December on record was 1997 with 325 mm. On average, December sees 83 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 Saint Augustine behaves each December, 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 December specifically, along with year-by-year records and how the month has changed over the decades.
