TROY SPRING · SEPTEMBER · NORTH FLORIDA
On September 11, 2026 the USGS gauge inside Troy Spring read 71.4°F (21.9°C). It reads close to that in February, in June and on the hottest afternoon of the year, because a Florida spring has no seasons. The air above it does, and NOAA puts the September normal high at 88.0°F. That 16.6°F gap between the air and the water is the reason people load a cooler and drive out here in early fall.
September takes its payment in rain: 5.82 inches across the month, measurable rain on 7.6 days, an inch or more on 1.9 of them. None of that changes the water. It changes the drive and the lot, because the state counts 25 parking spaces at Troy Spring State Park, and when the lot fills the gate closes.
THE MONTH AT A GLANCE · TROY SPRING · SEPTEMBER
Come for water that read 71.4°F in September 2026 and reads close to that all year, plan around 88.0°F afternoons and 5.82 inches of rain, and reach the 25-space lot early.
AVG HIGH 88.0°F · AVG LOW 69.8°F · 7.6 WET DAYS · WATER 71.4°F · 25 PARKING SPACES
Go for: a 71.4°F swim under an 88.0°F sky, a launch onto 0.4 miles of paddling trail, and school-year weekdays at a lot that holds 25 cars.
Think twice before: driving out on a wet Saturday. September averages 5.82 inches of rain, 1.9 days of it arriving an inch at a time, and the gate closes when the lot is full.
Air normals: NOAA NCEI 1991-2020, Cross City AP · Water: USGS gauge 02320250 · Park counts: Florida DEP 2024 inventory
On this page
- Average highs, lows and rain days in September88.0°F, 69.8°F and 5.82 inches
- How cold the spring water is71.4°F on the USGS gauge
- Parking and crowds on a September weekend25 spaces, and what we could not verify about fees
- Things to do at Troy Spring State ParkOne swim area, one launch, 0.4 miles of paddling trail
- A two-day plan around the heatSunrise 7:15 a.m., sunset 7:38 p.m.
- September vs August and October8.10, 5.82 and 2.23 inches of rain
- Is September the month to book?Yes for swimmers, no for walkers
Troy Spring weather in September: average highs, lows and rain days
| Measure | September at Troy Spring |
|---|---|
| Average high | 88.0°F |
| Average low | 69.8°F |
| Precipitation | 5.82 inches |
| Days with 0.10 in or more | 7.6 |
| Days with 1.00 in or more | 1.9 |
| Daylight on Sep 15 | 12 hours 22 minutes |
| Spring water | 71.4°F (gauge reading, Sep 11, 2026) |
The air numbers come from NOAA’s National Centers for Environmental Information, 1991-2020 monthly normals: an average high of 88.0°F, an average low of 69.8°F and 5.82 inches of precipitation for September. They are read off a real thermometer, station USW00012833 at Cross City Airport, about 27 miles (44 km) from the spring, and not off a modeled grid cell. Every air figure here carries that distance with it. The water number comes from somewhere else entirely, the USGS gauge sitting in the spring itself.
Measurable rain, meaning at least 0.10 inch, falls on 7.6 days in an average September, a bit under one day in four. On 1.9 of those days an inch or more comes down, so two days alone account for at least a third of the month’s 5.82 inches. A three-day trip rarely loses all three afternoons. A single-day drive has real odds of meeting a downpour, which is an argument for two nights rather than a long round trip.
Between the 69.8°F normal low and the 88.0°F normal high sits 18.2°F of daily swing. Mornings want a light long-sleeve layer you will resent by eleven, afternoons want shade, and the swim runs colder than either end of the range. Pack a second dry shirt, a towel you do not mind wringing out, and water shoes: the park’s built surface amounts to 50 feet of boardwalk and 0.3 miles of trail.
September 15 brings 12 hours 22 minutes of daylight, with sunrise at 7:15 a.m. and sunset at 7:38 p.m. Eastern Daylight Time. That puts the hottest hour and the best swimming hour in the same afternoon block, and it still leaves room for a second session after 5 p.m. without driving home in the dark. Leaving home after breakfast buys a full afternoon at the water.
How warm is Troy Spring in September?
September’s two poles at the Cross City station are 88.0°F by day and 69.8°F at night, 18.2°F apart. The spring sits under both of them: 71.4°F (21.9°C) when the USGS read station 02320250 on September 11, 2026. That is one instantaneous reading, not a monthly mean and not an average of daily maxima, and the gauge reads close to it every day of the year. Against an 88.0°F afternoon, the water runs 16.6°F cooler.
Mornings near 70°F are warm enough for shorts, and the first step into 71.4°F water will still make you gasp. By mid-afternoon the air sits at its normal 88.0°F and the same water reads as relief rather than shock. Walk the 0.3-mile trail early, swim late, and keep a dry shirt in the car, because wet cotton under the air conditioning turns the drive home unpleasant.
We found no freeze-day count in the NOAA normals we read for station USW00012833, so we give no number for frost. The mean minimum for the month is 69.8°F, which puts it 1.6°F under the spring’s 71.4°F. Air and water land within two degrees of each other around dawn. Warm layers can stay home in September. A rain shell cannot.
How busy is Troy Spring in September? Crowds, prices and the demand peak
We found no occupancy series and no monthly room-rate data for this corner of Florida, so we crown no month cheap and none expensive. The calendar still says something useful: the Labor Day weekend sits at the front of September, Florida schools are back in session, and the pressure on a 25-space lot draws from a smaller pool of visitors once that first weekend is past. Weekdays from mid-month onward are the quietest conditions September offers.
Nothing at the spring takes a reservation we could verify, so booking comes down to beds and to arrival time. Arrival time is the reservation for the lot: 25 spaces, first come, gate closed when they are gone. For beds, two nights is the usual shape of a spring weekend. Book the Saturday three or four weeks out if the date is fixed, and keep it refundable against 7.6 wet days. Regions and budgets live in our where-to-stay guide and the cost guide.
We could not verify the county lodging-tax rate, so we give no percentage. We also could not verify an entrance fee or an opening hour for Troy Spring State Park: floridastateparks.org answered our automated reads with a 403 error, and we would rather say so than borrow a price from another park. Florida fees differ park by park and season by season, so a figure found for a neighboring spring does not transfer. Check the park’s own page the morning you drive.
The one spending line that changes this month is flotation. The state counts one launch for canoes, kayaks and tubes and 0.4 miles of paddling trail, and we could not verify any on-site rental or its price, so plan to arrive with your own boat or tube on the roof. The second line is the car: we found no public transit serving the park, and our getting-around guide covers rentals, tolls and the drive times that make a north Florida spring day work.
Things to do in Troy Spring in September
September delivers 88.0°F afternoons with 7.6 wet days instead of August’s 11.5, and that pairing is what its neighbors cannot match. October’s 82.2°F cannot make 71.4°F water feel like rescue in the same way, and August buys the same heat with 8.10 inches of rain. Real warmth over a drier sky is the month’s offer, and the offer is aimed squarely at swimmers and paddlers.
Everything sits inside one gate. Florida’s Department of Environmental Protection counted the park in its 2024 facilities inventory: one designated swimming area, one launch for canoes, kayaks and tubes, 0.4 miles of paddling trail, 0.3 miles of hiking trail, 50 feet of boardwalk and 25 parking spaces. The swim area is the headline. The paddling trail is the reason to bring a boat, and the hiking trail is a short loop rather than an outing.
The water is the constant at 71.4°F, and the air is what moves. In September it sits 16.6°F above the water at the afternoon normal, which is the gap that makes the first step sharp and the tenth minute perfect. Come back in October, when the same pool sits 10.8°F under the air, and a long swim turns into a short one. Manatee seekers should note that we could not verify any count for this spring, so our manatee guide handles that question elsewhere.
Past the gate, nothing inside is separately ticketed as far as we could confirm: the swim area, the launch, the 0.4-mile paddling trail, the short hiking loop and the boardwalk. We also found no dated September event at the park, so we name none. What the gate itself costs stays open until you check the park’s page.
Troy Spring in September: a two-day itinerary
Day one runs on the light. Sunrise on September 15 lands at 7:15 a.m., so leave early enough that the 25 spaces are not a question. Take the 0.3-mile trail and the 50 feet of boardwalk first, while the air is still near the 69.8°F overnight normal. Swim from late morning, dry out, eat away from the water. Come back for a second swim between 4 and 6 p.m., once the 88.0°F normal high has done its work. Sunset is 7:38 p.m.
Day two belongs to the boat. Put in at the single launch, run the 0.4 miles of paddling trail, and give the rest of the morning to the Suwannee River if you have the craft for it. If the sky builds, the arithmetic helps: 7.6 days in the month bring at least 0.10 inch and only 1.9 bring a full inch, so most rain days still hold a swimmable window. Front-load the water, keep the drive home flexible, and send a washed-out afternoon toward the rest of the state’s list.
Troy Spring in September vs August and October
| Measure | August | September | October |
|---|---|---|---|
| Average high | 89.9°F | 88.0°F | 82.2°F |
| Average low | 72.9°F | 69.8°F | 59.9°F |
| Precipitation | 8.10 in | 5.82 in | 2.23 in |
| Days with 0.10 in or more | 11.5 | 7.6 | 3.7 |
| Afternoon air above 71.4°F water | 18.5°F | 16.6°F | 10.8°F |
August runs hotter and much wetter: 89.9°F days, 72.9°F nights, 8.10 inches of rain and 11.5 days with measurable precipitation. September takes 1.9°F off the afternoon, 3.1°F off the night and nearly four wet days off the calendar. October cuts the rain again, to 2.23 inches over 3.7 wet days, while dropping the high to 82.2°F and the low to 59.9°F. All three months share one figure, the spring’s 71.4°F.
Moving four weeks forward buys 3.59 fewer inches of rain and 3.9 fewer wet days, and costs 5.8°F of afternoon heat plus 9.9°F of night warmth. Walkers take that trade without thinking. Swimmers should hesitate: October leaves only 10.8°F between the air and the water, so the pool that reads as relief in September reads as cold in fall. Moving four weeks back gets the heat and pays 2.28 extra inches for it, and the August page carries those numbers in full.
Is September a good time to visit Troy Spring?
Yes, if you came for the water. A 71.4°F spring under an 88.0°F sky is the specific pleasure of a north Florida September, and 7.6 wet days out of thirty leave a large majority of afternoons clear. No, if the plan is built on land: 0.3 miles of trail at 88.0°F with the sun overhead is a warm-up rather than a day, and the month’s 5.82 inches arrive in bursts heavy enough to empty a swim area for an hour.
If the answer is no, October is the month to shift to: 2.23 inches of rain, 3.7 wet days and an 82.2°F afternoon that makes walking comfortable. Take the 59.9°F nights along with it, and accept that the swim becomes a plunge rather than an afternoon. For the twelve-month picture across the state, our best-time guide sorts the seasons region by region.
Of August, September and October, only September pairs an afternoon near 88.0°F with fewer than eight wet days. That is the pairing that makes 71.4°F water worth the drive.
The last word
Pick a weekday, reach the 25-space lot early, and split the swim into two sessions with the short trail in between rather than one long stretch in the water. Worth knowing before you go: Florida law classes the historic first-magnitude springs, plus six named by hand in the statute, as Outstanding Florida Springs under section 373.802(5). The gauge in the spring, USGS station 02320250, reads close to 71.4°F every day of the year. Look it up the morning you drive, along with the park’s hours.
Sources & data for this guide
- September air normals (88.0°F / 69.8°F / 5.82 in), 1991-2020 · NOAA NCEI monthly normals, station USW00012833, Cross City AP, FL, about 27 miles (44 km) from the spring · checked Sep 24, 2026
- Rain-day counts (7.6 days at 0.10 in, 1.9 days at 1.00 in) · same NOAA NCEI normals series · checked Sep 24, 2026
- August and October normals used in the comparison · same NOAA NCEI series, same 1991-2020 period, not estimates · checked Sep 24, 2026
- Daylight of 12h 22m, sunrise 7:15 a.m. and sunset 7:38 p.m. on September 15 · sunrise-sunset.org, UTC times converted to Eastern Daylight Time · checked Sep 24, 2026
- Water temperature 71.4°F (21.9°C), a single instantaneous reading · USGS National Water Information System, station 02320250 Troy Spring · checked Sep 24, 2026
- 25 parking spaces, 1 designated swimming area, 1 canoe, kayak and tube launch, 0.4 mi paddling trail, 0.3 mi hiking trail, 50 ft boardwalk · Florida Department of Environmental Protection, Recreational Facilities Inventory, 2024 annual report · checked Sep 24, 2026
- Outstanding Florida Springs definition · Florida Statutes 373.802(5), leg.state.fl.us · checked Sep 24, 2026
- We could not verify an entrance fee, an opening hour or a manatee count: floridastateparks.org returned a 403 to our automated reads and the FWC manatee page renders client-side · checked Sep 24, 2026
- Itinerary timings and packing advice are editorial; park hours and fees change · check the park before you drive.