Climate & Weather in Jacksonville
Jacksonville has a humid subtropical climate with hot, wet summers and short, mild winters, per NOAA's 30-year climate normals (1991-2020). Its river-town geography means hurricane-season rainfall risk is closely tied to the St. Johns River's flood behavior, covered in more depth on the flood-hurricane-risk page.
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Learn moreTemperature
Jacksonville's average annual temperature is about 69°F, per NOAA-based climate data aggregation. The warmest month averages around 92°F, typically in July or August, while the coldest month averages around 43°F, typically in January -- freezing temperatures occur occasionally in winter but are not the norm.
Rainfall
Jacksonville receives about 53.4 inches of precipitation annually based on NOAA's 1991-2020 climate normals, with a broadly similar ~52-inch figure cited by other weather-data aggregators. Most of that rainfall falls during the summer wet season, consistent with a humid subtropical climate pattern.
Hurricane Season Overlaps the Wettest Months
Atlantic hurricane season (June 1-November 30) overlaps substantially with Jacksonville's wettest months, meaning the period of highest rainfall risk is also the period of highest storm risk. See flood-hurricane-risk for the insurance and risk specifics tied to this overlap, including the Hurricane Irma (2017) flood event.
A River Runs Through It
The St. Johns River -- one of the few major US rivers that flows north -- runs directly through Jacksonville, and its behavior during heavy rain and storm surge is a recurring feature of the city's weather story in a way that's distinct from purely coastal Florida cities. This is the mechanism behind the flood risk detailed on the flood-hurricane-risk page, not a separate phenomenon.
Key takeaways
- Humid subtropical climate: annual average temperature ~69°F, with the warmest month averaging ~92°F (July/August) and the coldest averaging ~43°F (January), per NOAA-based climate normals.
- Annual precipitation runs about 52-53 inches, concentrated in the summer wet season, per NOAA's 1991-2020 normals.
- Hurricane season (June 1-Nov 30) overlaps with the wettest months -- see flood-hurricane-risk for the Irma (2017) flood event and insurance specifics.
- The St. Johns River running through the city is the defining geographic feature behind Jacksonville's flood risk, distinct from purely coastal exposure.
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