Prosper weather in September

In September, Prosper sees average daytime highs of 87°F and overnight lows near 68°F, with 3.2 in of rain across 6.4 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 83°F by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels muggy.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Prosper's 1st-clearest and 11th-windiest month. For the whole year in context, see Prosper's year-round climate.

Daytime high
87°
4th warmest
Overnight low
68°
9th coldest
Rainfall
3.2 in
6.4 wet days
Daylight
12 h 12 min
6:15 AM – 6:28 PM
Cloud cover
41%
1st clearest
Wind
7 mph
11th windiest
Solar energy
5.12 kWh/m²
Travel score
5.4
out of 10

Prosper is town in Collin and Denton counties in Texas, United States.

Density
270/km²
people per km²

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 90°F in the first days to 83°F by the end.

A typical September day in Prosper reaches about 87°F in the afternoon and slips back to 68°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 95°F. Set against its neighbours, September runs about 7°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19173
29173
39072
49072
59072
68971
78971
88971
98970
108870
118870
128769
138769
148769
158768
168668
178668
188667
198567
208567
218566
228566
238565
248465
258465
268464
278364
288363
298363
308363

How September really feels in Prosper

Once humidity and wind are folded in, September averages 10 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
10
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.

Prosper weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan55° / 37°2.66.80.410.13.9
Feb59° / 40°2.77.40.610.84.9
Mar67° / 48°4.09.20.211.76.3
Apr74° / 55°4.38.6012.87.1
May82° / 64°5.611.4013.76.1
Jun89° / 72°3.49014.24.4
Jul93° / 76°1.95.90143.3
Aug93° / 75°1.95.4013.23.4
Sep87° / 68°3.26.4012.25.4
Oct76° / 57°3.97.6011.27.5
Nov65° / 46°3.66.90.110.36.5
Dec56° / 39°3.57.10.39.84.3

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 29%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17228
27228
37129
47030
57030
66931
76931
86832
96832
106832
116832
126832
136832
146832
156832
166832
176931
186931
196931
207030
217129
227228
237327
247426
257426
267426
277426
287426
297426
307426

Chance of precipitation in September

Any precipitation

Prosper gets around 3.2 in of rain over 6.4 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 22% and peaks near 25% on the wettest days.

0%10%20%30%40%151015202530
Rain chance (%)
121
222
323
423
524
624
724
825
925
1025
1125
1225
1324
1424
1524
1624
1723
1823
1922
2021
2120
2219
2319
2418
2517
2617
2717
2817
2917
3018

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the muggy band about 31% of days. Sticky, muggy-or-worse air turns up on roughly 49% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
149223926
259233825
3510233725
4610233625
5710233624
6810223524
7910223524
8910213623
91010213523
101111203523
111211203523
121211193522
131311193422
141312193421
151412193421
161513193320
171613193320
181714193219
191814193118
202015193017
212116192816
222316192715
232417192614
242618192413
252818192312
262919192211
273119192010
283219191910
29341919189
30361919178

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287light breeze
297light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over September. Sunrise moves from 6:05 AM to 6:25 AM, and sunset from 6:49 PM to 6:08 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.76:056:49
212.76:066:47
312.76:076:46
412.66:076:44
512.66:086:43
612.66:096:42
712.56:096:40
812.56:106:39
912.46:116:38
1012.46:116:36
1112.46:126:35
1212.36:136:33
1312.36:136:32
1412.36:146:30
1512.26:156:29
1612.26:156:28
1712.26:166:26
1812.16:176:25
1912.16:186:23
2012.16:186:22
2112.06:196:20
2212.06:206:19
2312.06:206:18
2411.96:216:16
2511.96:226:15
2611.96:226:13
2711.86:236:12
2811.86:246:11
2911.76:256:09
3011.76:256:08

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.12 kWh/m².

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 6.79 kWh/m² in July across the year — September's 5.12 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.5Bright
45.5Bright
55.5Bright
65.4Bright
75.4Bright
85.3Bright
95.3Bright
105.3Bright
115.2Bright
125.2Bright
135.1Bright
145.1Bright
155.1Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.8Bright
294.8Bright
304.8Bright
Planning a trip in September

Is September a good time to visit Prosper?

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

5.4
Sightseeing
6th-best month of the year
7.5
Beach & pool
1st-best month of the year

September is a reasonable time to visit Prosper for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Prosper in September

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

In September, Prosper sees daytime highs around 87°F and nights near 68°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Prosper in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Prosper peaks around July 17 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 17UV 10Dec 21UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar6High
Apr9Very high
May9Very high
Jun10Very high
Jul10Extreme
Aug10Very high
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Prosper 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 Prosper is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.6× the cleanest month (October, 8 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1519 µg/m³Oct 248 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb8Good
Mar10Good
Apr11Good
May14Moderate
Jun16Moderate
Jul19Moderate
Aug15Moderate
Sep11Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Prosper?

Prosper sits at 33.2°N, 96.8°W, 682 ft above sea level, in United States. The nearest listed city is Frisco, 6.2 mi away.

Topography around Prosper

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

Within 2 miles, the terrain around Prosper has only modest variations in elevation — a maximum elevation change of 207 ft around an average of 679 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 312 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 873 ft.

The land around Prosper is covered by artificial surfaces (32%), grassland (30%) and cropland (24%) within 2 miles, grassland (39%) and artificial surfaces (27%) within 10 miles, and grassland (47%) and trees (26%) within 50 miles.

2 miles
207 ft
10 miles
312 ft
50 miles
873 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Frisco 6.2 mi · Celina 6.2 mi · The Trails of Frisco 6.8 mi · Little Elm 9.3 mi · McKinney 11 mi · The Colony 11 mi · Allen 12 mi · Plano 16 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 Prosper (33.2362°, -96.8011°, elevation 682 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. 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).