Weather in Jacksonville in August

A hard month. August is a hard month in Jacksonville, and worth planning around. You should expect rain on 24 days of the month, which is more days wet than dry.

August ranks 11 of 12 — near the bottom of Jacksonville's year. November is the month that works, and the swing between the two is 48 points, which is a different holiday rather than a slightly better one.

Rain on 24 of the month's 31 days, 5 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Pack for 32.6 °C days and 23.5 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest August day reached 39.3 °C and the coldest night fell to 18 °C, and the wettest single day dropped 106 mm — roughly 60% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 335 mm against 107 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 176 mm average is a reasonable planning figure, not a promise.

Wind is light at 1.9 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How August sits in the year

Temperatures hold steady either side: 32.9 °C in July, 32.6 here, 30.7 in September. Nothing about the timing within the month matters much. Rain is the thing that moves: September brings 8 days less of it, so pushing the dates later buys drier weather.

Daylight in August

13.3 hours of daylight, losing 0.8 hours across the month. That is between Jacksonville's extremes of 14.1 and 10.2 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about 28.4 °C in August — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Jacksonville versus nearby

If Jacksonville is one option among several, the nearby comparison is worth making. Tallahassee is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Tampa is close enough to be a coin toss — within a degree on temperature, 5 days more rain.

So: August is a compromise. November is 47 points better and is what Jacksonville is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Jacksonville

See all twelve months in Jacksonville, or where else to go in August.