Clearwater in August: Weather, Gulf Water Temperature and Crowds

CLEARWATER · FLORIDA · AUGUST

The Gulf off Clearwater averages 89.3°F in August, and the air above it carries an average high of 90.6°F. Those two numbers describe the month. You walk into the water without flinching at any hour, and you stay out of the sun for the middle of the day. Rain shows up on about a dozen days, usually in the afternoon, rarely for a whole one.

August is also the last full month of the school vacation, so beach parking, ferry seats and family rooms all want the same weekends. The nightly rate you were quoted arrives with 12% of tax on top, and the month’s rainfall totals 8.83 inches. In exchange you get water that needs no easing into and daylight until 8:10 PM in mid-month.

On this page

• Average highs, lows and rain daysThe August normals from the PIE gauge
• Sea temperature in August89.3°F, and what it does for swimming
• Crowds, booking and the lodging taxThe 12% you pay, and the parking that runs out
• Things to do in Clearwater in AugustHoneymoon Island, Caladesi and Anclote Key
• A two-day plan built around the heatFrom the 7:00 AM sunrise to the 8:10 PM one
• August vs July and SeptemberHow the three months compare, in figures
• Is August a good time to visit Clearwater?Yes for swimmers, no for walkers

Every figure here is an August figure, and nothing else. The base, the budget and the driving belong to other pages: where to stay in Florida, what a Florida trip costs, getting around the state. For the months either side, July and September carry their own normals.

Clearwater weather in August: average highs, lows and rain days

These normals come from a thermometer rather than a model grid cell: NOAA station USW00012873, listed as ST PETERSBURG INTL AP, on the 1991-2020 series. It reads an August average high of 90.6°F against an average low of 76.3°F. The gauge sits at PIE, between St. Petersburg and Clearwater, on the bay side rather than the Gulf, and the sea breeze that takes the edge off Clearwater Beach in the afternoon never reaches it. Read the daytime figure as the warm end of what you will feel, and the overnight one as close to exact.

Rainfall adds up to 8.83 inches, but the count that governs a vacation is the 12.5 days recording at least 0.10 inch, which works out to measurable rain about two days in five. On 2.9 days of an average August, an inch or more falls. Florida’s wet season runs on afternoon build-ups rather than all-day gray, as the state guide lays out, so most of those days cost you an hour and roughly three of them cost you a beach afternoon.

Between the 90.6°F afternoon and the 76.3°F before dawn sit 14.3 degrees, and nothing in that span asks for a layer. Pack for water and sun instead: a rash guard that dries in the room, one rain shell thin enough to carry all day, sandals you can walk into the Gulf with, and more sunscreen than the trip seems to need. Two swimsuits per person beats one, since nothing dries quickly in August air here.

On August 15 the sun clears the horizon at 7:00 AM and sets at 8:10 PM, for 13 hours 10 minutes of daylight. The value is at the two ends: a beach hour before eight that feels like a different month, and light on the sand after dinner. That 8:10 PM is a mid-month reading, and the evening end pulls back a little through the rest of August.

Can you swim in Clearwater in August? The Gulf runs 89.3°F

The Gulf surface off Clearwater averages 89.3°F in August in the Open-Meteo marine series, over 2015 to 2024. That figure is a mean of daily maxima, which reads a shade warmer than a 24-hour average would. In the same series July sits at 89.9°F and September at 86.8°F, so August holds the middle of the warm block rather than its top.

At that temperature the water does not cool you down. Children stay in until somebody makes them come out, adults swim at midday without the usual pause at knee height, and nobody in the party needs anything on their skin but sunscreen. The trade is that an hour in the Gulf leaves you as warm as you went in, so shade, a hat and drinking water do the job a cold sea would otherwise do.

Wind and swell are the gap in our data: we could not read a wave or wind series for Clearwater in August, so no number is quoted for either. The calendar caveat is solid, though. The Atlantic hurricane season runs June 1 to November 30 and peaks around September 10 per NOAA, as the season guide sets out, which makes an August booking a booking to keep refundable.

How busy is Clearwater in August? Crowds, booking and the 12% lodging tax

August falls inside the school-vacation block and closes it, and that places the month in the summer demand season rather than at any edge of the year. No monthly occupancy series and no monthly room-rate series for Pinellas County could be read for these dates, so nothing here ranks August against January on price. What is documented is the tax. What is visible from the road is the parking.

Booking lead times we cannot quantify either, and we are not going to invent a number of weeks. The constraint that is counted is the lot: Honeymoon Island State Park holds 2,021 parking spaces, the largest count of any state park in the 2024 state inventory, while Caladesi Island is credited with none at all. The room is a calendar question, the islands are a morning question, and a Tuesday moves the same trip into emptier sand than a Saturday.

Pinellas County levies a 6.0% transient rental tax on every night booked, collected alongside the 6% state sales tax, per the Florida Department of Revenue’s DR-15TDT schedule. That is 12% on top of the nightly rate you were quoted. A resort fee, where a property charges one, sits above that and is not a tax: the hotel sets the amount, keeps it, and is under no obligation to show it in the headline price.

One line of the budget genuinely changes August, and it is the distance to the water. A beachfront room turns the 90.6°F stretch between noon and four into a short walk back indoors instead of a drive and a hunt for a space, and it hands back the 7:00 AM hour when the sand is still empty. Food, rentals and the rest of the trip can be done lean without costing you the month.

Things to do in Clearwater in August: Honeymoon Island, Caladesi and Anclote Key

August hands you the water and takes back the trails. At 89.3°F the Gulf is swimmable from first light to the 8:10 PM sunset, a window no dry-season month here offers, and a kayak or a tube needs no plan beyond a launch point. Anything that means three miles on foot in the open moves to before nine, or it does not happen at all.

The state counts these places precisely. Honeymoon Island State Park: 4 miles of beach, 2,021 parking spaces, one designated swimming area, 3.4 miles of hiking trail, 1,671 feet of boardwalk. Caladesi Island State Park: 3 miles of beach, 2.5 miles of trail, one canoe, kayak and tube launch, and zero parking spaces, because it is an island reached by ferry or by your own boat. Anclote Key Preserve State Park: 6.7 miles of beach and 1,408 feet of boardwalk. Entrance fees and opening hours could not be read from the operators, so none appear here.

What the month changes at those addresses is the air, not the sea. The Gulf moves 2.5 degrees between August and September in the marine series and the sand does not move at all, but 90.6°F on an exposed boardwalk is a different walk from the same boardwalk in winter. Take Honeymoon Island’s 3.4 miles of trail early, and treat Anclote’s 1,408 feet of boardwalk as a morning errand rather than an afternoon one.

Free is harder to promise than usual, since the parks’ fee schedules could not be read and no amount is invented here. The unticketed part of August is the light: the beach before 8:00 AM, the walk along four miles of Honeymoon Island sand, and a sunset at 8:10 PM that lands late enough to sit through after dinner instead of before it.

Clearwater in August: a two-day itinerary

Day one opens at the 7:00 AM sunrise, because that hour and the next are the only stretch of an August day when walking and heat get along. Drive to Honeymoon Island early, cover part of the 3.4 miles of trail before nine, then change into the water and stay in it. Eat lunch indoors and stay indoors from roughly noon to four while the afternoon decides whether it is raining. Back on the sand at five, dinner after seven, sunset at 8:10 PM.

Day two belongs to Caladesi, which has no parking whatsoever, so it starts with a ferry or a friend’s boat instead of a lot. Three miles of beach and the single canoe, kayak and tube launch fill a morning, and the 2.5 miles of trail are early work or nothing. If the sky turns, the swap goes inland and under a roof: St. Petersburg’s museum row, the Dalí included, whose hours and admission we could not read from the operator. Most August rain costs an hour, and 2.9 days a month cost more than that.

Clearwater in August vs July and September

Side by side, August reads as July with slightly less rain. The afternoon average runs 90.6°F in August against 90.3°F in July and 88.9°F in September, all from the same NOAA station and the same 1991-2020 normals. Rainfall falls from 9.73 inches in July to 8.83 in August, then to 6.40 in September. Wet days barely budge between July and August, 12.6 against 12.5, before dropping to 8.6.

Push the trip four weeks later and you buy back nearly four wet days and 2.43 inches of rain, paying 2.5 degrees of sea temperature for it, 89.3°F down to 86.8°F in the marine series, in the month that holds the hurricane peak on September 10. Pull it four weeks earlier and almost nothing changes: an extra 0.90 inch of rain, a Gulf 0.6°F warmer, the same dozen wet days and the same afternoons.

Is August a good time to visit Clearwater?

Yes, when the trip is a beach trip. Families with small swimmers, anyone who wants the Gulf without a countdown at the water’s edge, and travelers whose program is sand, pool and an early alarm will get precisely what they came for. No, when the plan involves hiking, cycling, a day in the Everglades or any all-day outdoor schedule: at 90.6°F with matching humidity and measurable rain two days in five, you will be cutting those days short by lunchtime.

If the answer is no, do not slide to September for comfort: it trades four wet days for the statistical peak of the hurricane season. Go to the dry season instead, November through April, when Florida’s outdoor half works as advertised, and use the twelve-month view to pick the week. September is still worth a look if 86.8°F water matters to you more than storm risk does.

Among these three months, August is the only one that pairs a Gulf above 89°F with less rain than July, and it does it with light on the sand until 8:10 PM.

The last word

Book refundable, set the alarm for the 7:00 AM sunrise, and give the afternoon to air conditioning. That is the whole operating manual for a Clearwater August, and the rest is choosing which island. One more number for the flights: Clearwater’s own airport, PIE, boarded 1,228,048 passengers in calendar year 2024, which the FAA classes a small hub, so compare its fares against Tampa’s before you book (flying to Florida has the wider view).

Sources & data for this guide

• August normals (high 90.6°F, low 76.3°F, 8.83 in, 12.5 days at 0.10 in or more, 2.9 days at 1 in or more) · NOAA NCEI monthly normals 1991-2020, station USW00012873, ST PETERSBURG INTL AP · checked Sep 12, 2026
• July and September normals used in the comparison table · same NOAA NCEI 1991-2020 series and station · checked Sep 12, 2026
• Station caveat: the gauge sits at PIE, on the bay side between St. Petersburg and Clearwater, so the afternoon maximum runs warmer than a Gulf-front reading · NCEI station identity checked Sep 12, 2026
• Sea surface 89.3°F (Aug), 89.9°F (Jul), 86.8°F (Sep), mean of daily maxima 2015-2024 · Open-Meteo Marine API · checked Sep 12, 2026
• Daylight, sunrise and sunset for August 15 · sunrise-sunset.org, converted to local time · checked Sep 12, 2026
• Park counts: beach miles, boardwalk feet, trail miles, parking spaces at Honeymoon Island, Caladesi Island and Anclote Key · Florida Department of Environmental Protection, Recreational Facilities Inventory, 2024 annual report · checked Sep 12, 2026
• Lodging tax: 6.0% Pinellas transient rental tax plus 6% state sales tax · Florida Department of Revenue, DR-15TDT, revision 03/25 · checked Sep 12, 2026
• PIE passenger boardings, calendar year 2024 · Federal Aviation Administration · checked Sep 12, 2026
• Editorial reserve: bus and train fares, park entrance fees and opening hours could not be read from the operators on September 11, 2026 (gohart.org returned 404, psta.net did not respond, tampaairport.com returned 403). No fare or fee is invented on the strength of memory.