Lancaster weather in May

In May, Lancaster sees average daytime highs of 83°F and overnight lows near 65°F, with 4.8 in of rain across 10.9 wet days and about 13.7 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 80°F in the first days to 86°F by the end. The sky is clear or mostly clear about 35% of the time in May, and the air most often feels muggy.

Daylight stretches from about 13 h 18 min at the start of May to 14 hours by month's end. Set against the rest of the year, May is Lancaster's 12th-clearest and 3rd-windiest month. For the whole year in context, see Lancaster's year-round climate.

Daytime high
83°
5th warmest
Overnight low
65°
8th coldest
Rainfall
4.8 in
10.9 wet days
Daylight
13 h 42 min
5:33 AM – 7:13 PM
Cloud cover
56%
12th clearest
Wind
9 mph
3rd windiest
Solar energy
5.77 kWh/m²
Travel score
5.8
out of 10

Lancaster is city in Dallas County, Texas, United States.

Density
494/km²
people per km²

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 80°F in the first days to 86°F by the end.

A typical May day in Lancaster reaches about 83°F in the afternoon and slips back to 65°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 75°F and 90°F. Set against its neighbours, May runs about 7°F warmer than April and about 7°F cooler than June.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
17960
28061
38061
48061
58062
68062
78162
88163
98163
108263
118264
128264
138264
148265
158365
168365
178365
188366
198466
208467
218467
228567
238567
248568
258568
268668
278669
288669
298669
308769
318770

How May really feels in Lancaster

Once humidity and wind are folded in, May 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

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

Lancaster weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 39°2.87.110.14.4
Feb61° / 42°3.17.710.85.3
Mar68° / 49°3.99.211.86.5
Apr76° / 56°4.38.712.87.1
May83° / 65°4.810.913.75.8
Jun90° / 73°3.28.514.14.0
Jul94° / 76°1.76.313.93.0
Aug94° / 76°2.15.513.23.0
Sep88° / 69°2.5612.25.0
Oct78° / 58°4.17.811.27.2
Nov67° / 48°3.37.210.36.8
Dec58° / 40°3.679.94.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 16% of May, with mostly cloudy or overcast conditions the remaining 49%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35149
45050
55050
65050
75050
84951
95050
105050
115050
124951
135050
145050
155050
165050
175149
185149
195149
205050
215149
225050
235149
245149
255149
265248
275149
285248
295347
305446
315545

Chance of precipitation in May

Any precipitation

Lancaster gets around 4.8 in of rain over 10.9 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 34% and peaks near 35% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
535
635
735
835
935
1034
1134
1233
1333
1433
1532
1632
1732
1832
1932
2033
2133
2234
2334
2435
2535
2635
2735
2835
2935
3035
3135

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the muggy band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 47% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1361821214
2351822224
3331722234
4311722255
5301623265
6281623276
7271524286
8261524296
9241425306
10231425317
11221325327
12211326337
13201326338
14191326348
15181226358
16171226369
17161226379
181511253910
191411254010
201310254111
211210244311
22109244412
2399234613
2488234714
2578224914
2667225015
2757215116
2846215118
2936205219
3036205120
3136195121

Wind in May

Winds average 9 mph in May.

Across May, daily wind ranges from about 8 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
288light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 18 min at the start of May to 14 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over May. Sunrise moves from 5:46 AM to 5:25 AM, and sunset from 7:02 PM to 7:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:467:02
213.35:457:03
313.35:447:04
413.45:437:05
513.45:427:05
613.45:417:06
713.45:407:07
813.55:407:07
913.55:397:08
1013.55:387:09
1113.55:377:10
1213.65:367:10
1313.65:357:11
1413.65:357:12
1513.65:347:13
1613.75:337:13
1713.75:337:14
1813.75:327:15
1913.75:317:15
2013.85:317:16
2113.85:307:17
2213.85:297:18
2313.85:297:18
2413.85:287:19
2513.95:287:20
2613.95:277:20
2713.95:277:21
2813.95:277:22
2913.95:267:22
3013.95:267:23
3114.05:257:23

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.77 kWh/m².

For context, solar energy here swings from a low near 2.59 kWh/m² to a high of 6.8 kWh/m² in July across the year — May's 5.77 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.7Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.8Bright
135.8Bright
145.8Bright
155.8Bright
165.8Bright
175.8Bright
185.8Bright
195.8Bright
205.9Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
276.0Bright
286.0Bright
296.0Intense
306.0Intense
316.1Intense
Planning a trip in May

Is May a good time to visit Lancaster?

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

5.8
Sightseeing
5th-best month of the year
6.7
Beach & pool
3rd-best month of the year

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

What to pack for Lancaster in May

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

In May, Lancaster sees daytime highs around 83°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

UV index in Lancaster in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Lancaster peaks around June 23 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 highHighModerateJun 23UV 10Dec 21UV 3
UV index (midday)Level
Jan4Moderate
Feb5High
Mar6High
Apr9Very high
May10Very high
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov5Moderate
Dec3Moderate

Air quality in Lancaster in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Lancaster is worst in July — around 19 µg/m³ PM2.5 (moderate), about 2.5× 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
Feb9Good
Mar11Good
Apr11Good
May15Moderate
Jun17Moderate
Jul19Moderate
Aug15Moderate
Sep12Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Lancaster?

Lancaster sits at 32.6°N, 96.8°W, 522 ft above sea level, in United States. The nearest listed city is DeSoto, 5.6 mi away.

Topography around Lancaster

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

Within 2 miles, the terrain around Lancaster has only modest variations in elevation — a maximum elevation change of 167 ft around an average of 531 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 472 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 801 ft.

The land around Lancaster is covered by trees (36%), grassland (24%) and cropland (21%) within 2 miles, trees (33%) and grassland (32%) within 10 miles, and grassland (47%) and trees (24%) within 50 miles.

2 miles
167 ft
10 miles
472 ft
50 miles
801 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: DeSoto 5.6 mi · Duncanville 9.9 mi · Cedar Hill 12 mi · Balch Springs 12 mi · Seagoville 13 mi · Dallas 14 mi · Mesquite 15 mi · Waxahachie 15 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 Lancaster (32.5921°, -96.7561°, 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).