Riviera Beach weather in September

In September, Riviera Beach sees average daytime highs of 84°F and overnight lows near 79°F, with 7.0 in of rain across 23.3 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 84°F through the month. The sky is clear or mostly clear about 24% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Riviera Beach's 12th-clearest and 9th-windiest month. For the whole year in context, see Riviera Beach's year-round climate.

Daytime high
84°
3rd warmest
Overnight low
79°
10th coldest
Rainfall
7.0 in
23.3 wet days
Daylight
12 h 12 min
6:10 AM – 6:19 PM
Cloud cover
68%
12th clearest
Wind
8 mph
9th windiest
Solar energy
4.92 kWh/m²
Travel score
3.8
out of 10

Riviera Beach is city in Palm Beach County, Florida, United States.

Density
1,281/km²
people per km²
Founded
1922

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 84°F through the month.

A typical September day in Riviera Beach reaches about 84°F in the afternoon and slips back to 79°F overnight — a 5°F spread between the day's warmth and the night's chill. On most days the high lands between 82°F and 86°F. Set against its neighbours, September runs on par with August and about 3°F warmer than October.

70°80°90°151015202530
Avg high (°F)Avg low (°F)
18579
28579
38579
48579
58579
68579
78579
88479
98479
108479
118479
128479
138479
148479
158479
168479
178479
188479
198479
208479
218479
228478
238478
248378
258378
268378
278378
288378
298378
308378

How September really feels in Riviera Beach

Once humidity and wind are folded in, September averages 30 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
30
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Riviera Beach weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan72° / 64°2.07.110.57.2
Feb73° / 65°1.96.511.17.4
Mar74° / 67°2.67.811.87.4
Apr77° / 71°2.68.412.67.2
May80° / 75°4.012.413.36.3
Jun83° / 78°6.521.113.74.2
Jul85° / 79°5.322.513.53.7
Aug85° / 80°6.524.212.93.5
Sep84° / 79°7.023.312.23.8
Oct81° / 76°4.515.111.45.7
Nov77° / 71°2.29.310.77.1
Dec74° / 67°1.77.410.37.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23367
33367
43565
53565
63664
73664
83763
93961
103961
114060
124060
134159
144258
154357
164357
174357
184357
194357
204357
214357
224258
234258
244258
254258
264258
274258
284258
294456
304456

Chance of precipitation in September

Any precipitation

Riviera Beach gets around 7.0 in of rain over 23.3 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 77% and peaks near 83% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
183
283
383
483
583
683
782
882
981
1080
1179
1279
1378
1477
1577
1676
1776
1875
1974
2074
2174
2273
2373
2472
2572
2672
2771
2870
2969
3068

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the miserable band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1013267
2013366
3013465
4013564
5013663
6013762
7013960
8014059
9014257
10014356
11014455
12014554
13024652
14024751
15024850
16024949
17025048
18025048
19035047
20035146
21035245
22035344
23045343
24045442
25055441
26055540
27065539
28065539
29175438
30185437

Wind in September

Winds average 8 mph in September.

Across September, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
18light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
279light breeze
289light breeze
299light breeze
309light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 36 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over September. Sunrise moves from 6:03 AM to 6:16 AM, and sunset from 6:37 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.66:036:37
212.56:046:35
312.56:046:34
412.56:056:33
512.56:056:32
612.46:056:31
712.46:066:30
812.46:066:29
912.36:076:27
1012.36:076:26
1112.36:086:25
1212.36:086:24
1312.26:096:23
1412.26:096:22
1512.26:096:20
1612.26:106:19
1712.16:106:18
1812.16:116:17
1912.16:116:16
2012.06:126:14
2112.06:126:13
2212.06:136:12
2312.06:136:11
2411.96:136:10
2511.96:146:09
2611.96:146:07
2711.96:156:06
2811.86:156:05
2911.86:166:04
3011.86:166:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.92 kWh/m².

For context, solar energy here swings from a low near 3.09 kWh/m² to a high of 6.32 kWh/m² in May across the year — September's 4.92 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.2Bright
45.2Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.8Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.6Bright
284.6Bright
294.6Bright
304.5Bright
Planning a trip in September

Hazard calendar for Riviera Beach

In seasonPeak

In September, Riviera Beach sits inside its atlantic hurricane and rainy season season. The full year is below, with each hazard's peak months called out.

Riviera Beach sits in the Atlantic hurricane belt; the season peaks August–October.

Riviera Beach's rainy season runs May–October, when most of the year's rain falls.

Atlantic hurricane
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Riviera Beach?

Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.8
Sightseeing
10th-best month of the year
4.8
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Riviera Beach.

What to pack for Riviera Beach in September

From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In September, Riviera Beach sees daytime highs around 84°F and nights near 79°F. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.

light clothesrain gearsun protection

Sea temperature near Riviera Beach in September

The nearest coast averages about 85°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 mi away) is warmest in August at about 85°F and coldest in February near 77°F.

The water stays above 68°F all year — warm enough for a swim any month.

75°80°85°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan77Warm
Feb77Warm
Mar77Warm
Apr78Warm
May81Warm
Jun83Tropical
Jul84Tropical
Aug85Tropical
Sep85Tropical
Oct83Tropical
Nov81Warm
Dec79Warm

UV index in Riviera Beach in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Riviera Beach peaks around July 12 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 5 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighModerateJul 12UV 11Dec 18UV 5
UV index (midday)Level
Jan5High
Feb7Very high
Mar9Very high
Apr9Very high
May9Very high
Jun11Extreme
Jul12Extreme
Aug11Extreme
Sep9Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Riviera Beach in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Riviera Beach is worst in July — around 20 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1819 µg/m³Dec 138 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar11Good
Apr11Good
May11Good
Jun15Moderate
Jul20Moderate
Aug17Moderate
Sep12Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Riviera Beach?

Riviera Beach sits at 26.8°N, 80.1°W, 13 ft above sea level, in United States. The nearest listed city is West Palm Beach, 4.3 mi away.

Topography around Riviera Beach

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Riviera Beach.

Within 2 miles, the terrain around Riviera Beach has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 13 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 157 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 210 ft.

The land around Riviera Beach is covered by artificial surfaces (56%) and water (25%) within 2 miles, water (48%) and artificial surfaces (22%) within 10 miles, and water (43%) within 50 miles.

2 miles
56 ft
10 miles
157 ft
50 miles
210 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
September weather nearby: West Palm Beach 4.3 mi · Palm Beach Gardens 6.2 mi · Palm Springs 9.9 mi · Lake Worth Beach 11 mi · Jupiter 11 mi · Greenacres City 11 mi · Lake Worth Corridor 11 mi · Royal Palm Beach 12 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Riviera Beach (26.7753°, -80.0581°, elevation 13 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).