Seguin weather in December

In December, Seguin sees average daytime highs of 65°F and overnight lows near 45°F, with 2.5 in of rain across 7.6 wet days and about 10.1 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 67°F in the first days to 63°F by the end. The sky is clear or mostly clear about 38% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 12 min at the start of December to 10 h 06 min by month's end. Set against the rest of the year, December is Seguin's 10th-clearest and 7th-windiest month. For the whole year in context, see Seguin's year-round climate.

Daytime high
65°
11th warmest
Overnight low
45°
2nd coldest
Rainfall
2.5 in
7.6 wet days
Daylight
10 h 06 min
7:25 AM – 5:31 PM
Cloud cover
56%
10th clearest
Wind
8 mph
7th windiest
Solar energy
2.69 kWh/m²
Travel score
6.2
out of 10

Seguin is city in and county seat of Guadalupe County, Texas, United States.

Density
310/km²
people per km²
Founded
1838

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 67°F in the first days to 63°F by the end.

A typical December day in Seguin reaches about 65°F in the afternoon and slips back to 45°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 51°F and 77°F. Set against its neighbours, December runs about 7°F cooler than November and about 1°F warmer than January.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16847
26747
36747
46747
56747
66646
76646
86646
96646
106546
116545
126545
136545
146545
156545
166445
176444
186444
196444
206444
216444
226444
236344
246344
256344
266343
276343
286343
296343
306243
316243

How December really feels in Seguin

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Seguin weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 43°2.47.110.36.0
Feb67° / 47°2.27.110.96.6
Mar73° / 54°2.88.611.87.1
Apr80° / 60°2.98.112.76.8
May87° / 68°4.110.113.54.9
Jun92° / 74°2.68.813.93.5
Jul95° / 75°1.86.813.72.7
Aug96° / 76°2.06.113.12.4
Sep90° / 71°2.88.812.24.0
Oct82° / 62°3.17.611.36.6
Nov72° / 52°2.77.110.57.2
Dec65° / 45°2.57.610.16.2

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 38% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35149
45050
55050
64951
74951
84951
94951
104951
114951
124852
134951
144852
154852
164951
175050
185050
195050
204852
214852
224753
234753
244654
254654
264654
274555
284555
294555
304555
314654

Chance of precipitation in December

Any precipitation

Seguin gets around 2.5 in of rain over 7.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 27% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
124
224
324
425
525
625
726
826
926
1027
1127
1227
1327
1426
1526
1626
1725
1825
1925
2024
2124
2223
2323
2423
2522
2622
2722
2822
2922
3022
3122

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the dry band about 79% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1739126
2749116
3758116
4758116
5768106
6768106
7768106
878895
978895
1077995
1177995
1278994
1379984
1479984
15791083
16791083
17791083
18791083
19791083
20801073
21801073
22801073
2381973
2481973
2581973
2682873
2783863
2883863
2984763
3084763
3185762

Wind in December

Winds average 8 mph in December.

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

0246810151015202531
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
278light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 12 min at the start of December to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:14 AM to 7:31 AM, and sunset from 5:29 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.27:145:29
210.27:155:29
310.27:165:29
410.27:175:29
510.27:175:29
610.27:185:29
710.27:195:29
810.27:205:29
910.27:205:30
1010.17:215:30
1110.17:225:30
1210.17:225:30
1310.17:235:30
1410.17:235:31
1510.17:245:31
1610.17:255:31
1710.17:255:32
1810.17:265:32
1910.17:265:33
2010.17:275:33
2110.17:275:33
2210.17:285:34
2310.17:285:34
2410.17:295:35
2510.17:295:35
2610.17:305:36
2710.17:305:36
2810.17:305:37
2910.17:315:38
3010.17:315:38
3110.17:315:39

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.69 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.69 kWh/m² to a high of 6.67 kWh/m² in July across the year — December's 2.69 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.8Moderate
22.8Moderate
32.8Moderate
42.8Moderate
52.7Moderate
62.7Moderate
72.7Moderate
82.7Moderate
92.7Moderate
102.7Moderate
112.7Moderate
122.7Moderate
132.7Moderate
142.7Moderate
152.7Moderate
162.7Moderate
172.7Moderate
182.7Moderate
192.7Moderate
202.7Moderate
212.7Moderate
222.7Moderate
232.7Moderate
242.7Moderate
252.7Moderate
262.7Moderate
272.7Moderate
282.8Moderate
292.8Moderate
302.8Moderate
312.8Moderate
Planning a trip in December

Is December a good time to visit Seguin?

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

6.2
Sightseeing
6th-best month of the year
2.2
Beach & pool
11th-best month of the year

December is a reasonable time to visit Seguin for sightseeing.

What to pack for Seguin in December

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

In December, Seguin sees daytime highs around 65°F and nights near 45°F. Worth packing: a warm layer. About 8 days see rain.

a warm layer

UV index in Seguin in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Seguin peaks around August 10 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateAug 10UV 11Dec 20UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar7High
Apr10Very high
May10Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov5High
Dec4Moderate

Air quality in Seguin in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Seguin is worst in July — around 18 µg/m³ PM2.5 (moderate), about 2.8× the cleanest month (October, 6 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Oct 246 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb7Good
Mar9Good
Apr10Good
May15Moderate
Jun15Moderate
Jul18Moderate
Aug12Good
Sep10Good
Oct6Good
Nov6Good
Dec7Good
Location & terrain

Where is Seguin?

Seguin sits at 29.6°N, 98.0°W, 522 ft above sea level, in United States. The nearest listed city is New Braunfels, 13 mi away.

Topography around Seguin

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

Within 2 miles, the terrain around Seguin has only modest variations in elevation — a maximum elevation change of 157 ft around an average of 528 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 410 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,775 ft.

The land around Seguin is covered by grassland (30%), trees (29%) and artificial surfaces (29%) within 2 miles, grassland (48%), trees (29%) and cropland (20%) within 10 miles, and grassland (48%) and trees (42%) within 50 miles.

2 miles
157 ft
10 miles
410 ft
50 miles
1,775 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: New Braunfels 13 mi · Cibolo 16 mi · Schertz 19 mi · Universal City 20 mi · Converse 21 mi · San Marcos 22 mi · Live Oak 22 mi · Canyon Lake 28 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 Seguin (29.5688°, -97.9647°, elevation 522 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).