Lethbridge weather in May

In May, Lethbridge sees average daytime highs of 18°C and overnight lows near 5°C, with 59 mm of precipitation across 9.1 wet days and about 15.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 19°C by the end. The sky is clear or mostly clear about 26% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 24 min at the start of May to 15 h 42 min by month's end. Set against the rest of the year, May is Lethbridge's 9th-clearest and 8th-windiest month. For the whole year in context, see Lethbridge's year-round climate.

Daytime high
18°
5th warmest
Overnight low
8th coldest
Precipitation
59 mm
9.1 wet days
Daylight
15 h 06 min
4:53 AM – 8:02 PM
Cloud cover
62%
9th clearest
Wind
12 km/h
8th windiest
Solar energy
6.23 kWh/m²
Travel score
5.7
out of 10

Lethbridge is city in Alberta, Canada.

Air quality
Excellent
PM2.5 5 µg/m³ · 2019
Density
843/km²
people per km²
Founded
1874

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 15°C in the first days to 19°C by the end.

A typical May day in Lethbridge reaches about 18°C in the afternoon and slips back to 5°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 10°C and 25°C. Set against its neighbours, May runs about 6°C warmer than April and about 4°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1153
2153
3153
4163
5163
6164
7164
8164
9174
10174
11174
12175
13175
14185
15185
16185
17186
18186
19186
20186
21196
22197
23197
24197
25197
26197
27197
28198
29208
30208
31208

How May really feels in Lethbridge

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 4 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
4
wind chill below the day's low

The story in May is cold — wind chill drags the overnight "feels like" below the raw low.

Lethbridge weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -10°144.44.98.40.0
Feb / -9°133.94.59.80.0
Mar / -5°2265.411.50.6
Apr12° / 407.93.413.43.3
May18° / 599.1115.15.7
Jun21° / 10°92110166.3
Jul26° / 12°356.8015.77.5
Aug25° / 11°355.80.114.27.7
Sep20° / 375.80.412.47.0
Oct12° / 285.82.210.53.8
Nov / -4°225.34.88.80.3
Dec-0° / -9°164.44.780.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14159
24159
34060
44159
54159
64258
74258
84258
94258
104357
114159
124159
134159
144159
154258
164258
174159
184159
194159
204258
214258
224357
234258
244357
254456
264456
274456
284456
294654
304654
314654

Chance of precipitation in May

Any precipitationSnow

Lethbridge gets around 59 mm of rain and snow over 9.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 30% and peaks near 34% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1289
2289
3289
4288
5288
6287
7286
8286
9285
10285
11284
12284
13283
14283
15282
16282
17292
18292
19301
20301
21311
22311
23321
24321
25321
26331
27331
28331
29341
30341
31341

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
28991
29991
30991
31991

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 24 min at the start of May to 15 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over May. Sunrise moves from 5:17 AM to 4:37 AM, and sunset from 7:40 PM to 8:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.45:177:40
214.45:167:41
314.55:147:43
414.55:127:44
514.65:107:46
614.65:097:47
714.75:077:49
814.75:057:50
914.85:047:52
1014.85:027:53
1114.95:017:55
1214.94:597:56
1315.04:587:57
1415.04:567:59
1515.14:558:00
1615.14:538:02
1715.24:528:03
1815.24:518:05
1915.34:498:06
2015.34:488:07
2115.44:478:09
2215.44:468:10
2315.44:448:11
2415.54:438:12
2515.54:428:14
2615.64:418:15
2715.64:408:16
2815.64:398:17
2915.74:388:18
3015.74:388:20
3115.74:378:21

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.23 kWh/m².

For context, solar energy here swings from a low near 1.16 kWh/m² to a high of 7 kWh/m² in July across the year — May's 6.23 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
36.0Bright
46.0Intense
56.0Intense
66.0Intense
76.1Intense
86.1Intense
96.1Intense
106.2Intense
116.2Intense
126.2Intense
136.2Intense
146.2Intense
156.2Intense
166.2Intense
176.2Intense
186.2Intense
196.3Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.3Intense
256.3Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.5Intense
316.5Intense
Planning a trip in May

Is May a good time to visit Lethbridge?

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

5.7
Sightseeing
5th-best month of the year
1.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Lethbridge for sightseeing.

What to pack for Lethbridge in May

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

In May, Lethbridge sees daytime highs around 18°C and nights near 5°C. Pack sun protection. Worth having: a warm layer and rain gear. About 9 days see rain.

sun protectiona warm layerrain gear

UV index in Lethbridge in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Lethbridge peaks around July 15 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highModerateLowJul 15UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun6High
Jul8Very high
Aug5Moderate
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Lethbridge?

Lethbridge sits at 49.7°N, 112.8°W, 907 m above sea level, in Canada. The nearest listed city is Okotoks, 141 km away.

Topography around Lethbridge

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lethbridge.

Within 3 km, the terrain around Lethbridge has only modest variations in elevation — a maximum elevation change of 106 m around an average of 904 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 178 m; within 80 km, large variations in elevation — a maximum elevation change of 1,058 m.

The land around Lethbridge is covered by artificial surfaces (54%) and grassland (29%) within 3 km, cropland (55%) and grassland (34%) within 16 km, and cropland (58%) and grassland (39%) within 80 km.

3 km
106 m
16 km
178 m
80 km
1,058 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Okotoks 141 km · Auburn Bay 155 km · Cranston 156 km · McKenzie Towne 158 km · Medicine Hat 158 km · Evergreen 164 km · Chestermere 164 km · Beltline 173 km

Canada travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 83% of US
price level, 2025
GDP per capita
$55,698
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
2
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 53%none 35%Muslim 5%Hindu 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 Lethbridge (49.7°, -112.8186°, elevation 907 m), 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).