Mission weather in September

In September, Mission sees average daytime highs of 93°F and overnight lows near 75°F, with 3.5 in of rain across 11.8 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 95°F in the first days to 91°F by the end. The sky is clear or mostly clear about 43% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Mission's 8th-clearest and 12th-windiest month. For the whole year in context, see Mission's year-round climate.

Daytime high
93°
4th warmest
Overnight low
75°
9th coldest
Rainfall
3.5 in
11.8 wet days
Daylight
12 h 12 min
6:23 AM – 6:32 PM
Cloud cover
52%
8th clearest
Wind
8 mph
12th windiest
Solar energy
5.28 kWh/m²
Travel score
3.1
out of 10

Mission is city in Hidalgo County, Texas, United States.

Density
903/km²
people per km²
Founded
1910

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 95°F in the first days to 91°F by the end.

A typical September day in Mission reaches about 93°F in the afternoon and slips back to 75°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 86°F and 99°F. Set against its neighbours, September runs about 5°F cooler than August and about 5°F warmer than October.

60°70°80°90°100°151015202530
Avg high (°F)Avg low (°F)
19577
29577
39577
49576
59476
69476
79476
89476
99476
109376
119376
129375
139375
149375
159275
169275
179274
189274
199274
209274
219274
229273
239173
249173
259173
269173
279172
289172
299172
309172

How September really feels in Mission

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
10 feel dangerously hot (≥ 102°F)
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.

Mission weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan72° / 52°1.04.410.57.5
Feb76° / 56°0.94.411.17.7
Mar82° / 62°1.45.211.86.8
Apr88° / 68°1.75.312.65.0
May92° / 73°2.26.613.33.5
Jun96° / 77°2.07.113.62.4
Jul98° / 78°2.15.813.52.0
Aug98° / 78°1.66.812.91.8
Sep93° / 75°3.511.812.23.1
Oct87° / 68°2.36.711.45.2
Nov79° / 60°1.45.310.77.5
Dec73° / 54°1.25.110.47.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 39%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15842
25743
35743
45743
55644
65644
75644
85545
95545
105644
115644
125644
135743
145842
155842
165842
175941
186139
196139
206238
216436
226535
236634
246733
256832
266931
277129
287129
297228
307228

Chance of precipitation in September

Any precipitation

Mission gets around 3.5 in of rain over 11.8 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 38% and peaks near 46% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202530
Rain chance (%)
138
240
341
442
544
645
745
846
946
1046
1146
1245
1344
1443
1543
1642
1740
1839
1938
2036
2135
2234
2332
2431
2530
2629
2729
2828
2928
3027

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1002107117
2002107018
3012106918
4012106918
5012106819
6012106819
7012106819
8013106620
901396720
1001396720
1101396621
1202496421
13024106321
14025106221
15025106320
16026106220
17137115919
18137115919
19138125818
20149135617
212410145416
222410155415
232511165214
242512175014
253613184813
263613194712
273614204611
283714214510
29471421449
30471522439

Wind in September

Winds average 8 mph in September, the calmest month.

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
19light breeze
29light breeze
39light 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
278light breeze
288light breeze
298light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 6:17 AM to 6:29 AM, and sunset from 6:49 PM to 6:16 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:176:49
212.56:176:48
312.56:186:47
412.56:186:46
512.46:186:45
612.46:196:44
712.46:196:43
812.46:206:41
912.36:206:40
1012.36:216:39
1112.36:216:38
1212.36:216:37
1312.26:226:36
1412.26:226:35
1512.26:236:33
1612.26:236:32
1712.16:236:31
1812.16:246:30
1912.16:246:29
2012.06:256:28
2112.06:256:26
2212.06:266:25
2312.06:266:24
2411.96:266:23
2511.96:276:22
2611.96:276:21
2711.96:286:19
2811.86:286:18
2911.86:296:17
3011.86:296:16

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.28 kWh/m².

For context, solar energy here swings from a low near 3.06 kWh/m² to a high of 6.78 kWh/m² in July across the year — September's 5.28 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.6Bright
45.6Bright
55.5Bright
65.5Bright
75.5Bright
85.4Bright
95.4Bright
105.4Bright
115.3Bright
125.3Bright
135.3Bright
145.3Bright
155.3Bright
165.2Bright
175.2Bright
185.2Bright
195.2Bright
205.2Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.1Bright
285.1Bright
295.1Bright
305.1Bright
Planning a trip in September

Is September a good time to visit Mission?

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

3.1
Sightseeing
9th-best month of the year
5.9
Beach & pool
7th-best month of the year

September is a weaker month for outdoor sightseeing in Mission.

What to pack for Mission in September

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

In September, Mission sees daytime highs around 93°F and nights near 75°F. Pack light clothes. Worth having: rain gear and sun protection. About 12 days see rain.

light clothesrain gearsun protection

UV index in Mission in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mission peaks around June 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeExtremeVery highHighJun 20UV 12Dec 22UV 5
UV index (midday)Level
Jan5Moderate
Feb7High
Mar8Very high
Apr11Extreme
May9Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep10Very high
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Mission 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 Mission is worst in July — around 26 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (November, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1625 µg/m³Nov 107 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb10Good
Mar11Good
Apr13Moderate
May20Moderate
Jun21Moderate
Jul26Moderate
Aug19Moderate
Sep12Moderate
Oct8Good
Nov7Good
Dec9Good
Location & terrain

Where is Mission?

Mission sits at 26.2°N, 98.3°W, 141 ft above sea level, in United States. The nearest listed city is Alton, 5.0 mi away.

Topography around Mission

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

Within 2 miles, the terrain around Mission has only modest variations in elevation — a maximum elevation change of 66 ft around an average of 135 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 233 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,020 ft.

The land around Mission is covered by artificial surfaces (51%) and trees (25%) within 2 miles, trees (31%), artificial surfaces (23%) and cropland (20%) within 10 miles, and cropland (33%), grassland (23%) and shrubs (22%) within 50 miles.

2 miles
66 ft
10 miles
233 ft
50 miles
1,020 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Alton 5.0 mi · McAllen 6.2 mi · Pharr 8.7 mi · Reynosa 9.9 mi · San Juan 11 mi · Edinburg 12 mi · Alamo 12 mi · Donna 17 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 Mission (26.2159°, -98.3253°, elevation 141 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).