Halton Hills weather in May

In May, Halton Hills sees average daytime highs of 18°C and overnight lows near 7°C, with 84 mm of precipitation across 11.6 wet days and about 14.5 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 21°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 13 h 54 min at the start of May to 15 hours by month's end. Set against the rest of the year, May is Halton Hills's 5th-clearest and 8th-windiest month. For the whole year in context, see Halton Hills's year-round climate.

Daytime high
18°
5th warmest
Overnight low
8th coldest
Precipitation
84 mm
11.6 wet days
Daylight
14 h 30 min
5:01 AM – 7:31 PM
Cloud cover
63%
5th clearest
Wind
12 km/h
8th windiest
Solar energy
5.89 kWh/m²
Travel score
5.5
out of 10

Halton Hills is town in Halton Region, Ontario, Canada.

Founded
1974

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 21°C by the end.

A typical May day in Halton Hills reaches about 18°C in the afternoon and slips back to 7°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 26°C. Set against its neighbours, May runs about 7°C warmer than April and about 5°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1155
2155
3165
4165
5165
6166
7166
8176
9176
10176
11176
12177
13177
14187
15187
16187
17187
18198
19198
20198
21198
22198
23209
24209
25209
26209
272010
282110
292110
302110
312110

How May really feels in Halton Hills

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 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
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.

Halton Hills 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-2° / -10°6110.28.99.10.0
Feb-1° / -10°518.2710.20.0
Mar / -5°599.75.711.60.3
Apr12° / 8311.42.813.22.8
May18° / 8411.6014.55.5
Jun23° / 13°8911.6015.26.5
Jul26° / 15°8211014.96.6
Aug25° / 14°7410013.86.9
Sep21° / 10°749.6012.36.4
Oct13° / 7611.10.510.83.6
Nov / -1°7010.13.59.50.6
Dec / -6°6110.27.88.80.0

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 18% of May, with mostly cloudy or overcast conditions the remaining 57%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
24060
34060
44159
54159
64159
74258
84258
94258
104258
114357
124357
134357
144456
154456
164456
174357
184357
194357
204357
214456
224456
234654
244654
254654
264555
274555
284555
294555
304456
314456

Chance of precipitation in May

Any precipitationSnow

Halton Hills gets around 84 mm of rain and snow over 11.6 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 37% and peaks near 39% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1392
2391
3381
4381
5381
6381
7380
8380
9380
10380
11380
12380
13380
14380
15380
16380
17370
18370
19370
20370
21360
22360
23360
24360
25360
26360
27360
28360
29360
30360
31360

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 89% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
197210
296310
396310
496310
596310
695410
795410
895410
995410
1093520
1193520
1293520
1392620
1492620
1592620
1691630
1790730
1890730
1988840
2087841
2186851
2284961
2384961
24821071
25821071
26801082
27791182
28781192
29771292
30771292
31751393

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
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 54 min at the start of May to 15 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over May. Sunrise moves from 5:20 AM to 4:48 AM, and sunset from 7:14 PM to 7:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:207:14
213.95:187:15
314.05:177:16
414.05:167:18
514.15:147:19
614.15:137:20
714.25:117:21
814.25:107:22
914.25:097:23
1014.35:087:25
1114.35:067:26
1214.45:057:27
1314.45:047:28
1414.45:037:29
1514.55:027:30
1614.55:017:31
1714.64:597:32
1814.64:587:34
1914.64:577:35
2014.74:567:36
2114.74:567:37
2214.74:557:38
2314.84:547:39
2414.84:537:40
2514.84:527:41
2614.84:517:42
2714.94:517:43
2814.94:507:44
2914.94:497:45
3014.94:487:45
3115.04:487:46

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.89 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 6.27 kWh/m² in June across the year — May's 5.89 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.6Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.8Bright
115.8Bright
125.8Bright
135.8Bright
145.8Bright
155.9Bright
165.9Bright
175.9Bright
186.0Bright
196.0Bright
206.0Bright
216.0Intense
226.0Intense
236.0Intense
246.1Intense
256.1Intense
266.1Intense
276.1Intense
286.1Intense
296.1Intense
306.1Intense
316.1Intense
Planning a trip in May

Is May a good time to visit Halton Hills?

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

5.5
Sightseeing
5th-best month of the year
2.0
Beach & pool
5th-best month of the year

May is a reasonable time to visit Halton Hills for sightseeing.

What to pack for Halton Hills in May

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

In May, Halton Hills sees daytime highs around 18°C and nights near 7°C. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near Halton Hills in May

The nearest coast averages about 8°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 38 km away) is warmest in August at about 21°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 22 to Sep 1 — about 1.4 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarm
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May8Bracing
Jun15Cool
Jul20Cool
Aug21Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in Halton Hills 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 Halton Hills peaks around June 22 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 highHighModerateLowJun 22UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul8Very high
Aug7High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Halton Hills 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 Halton Hills is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1515 µg/m³Nov 218 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar13Moderate
Apr13Moderate
May14Moderate
Jun15Moderate
Jul16Moderate
Aug14Moderate
Sep13Moderate
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Halton Hills?

Halton Hills sits at 43.6°N, 79.9°W, 262 m above sea level, in Canada. The nearest listed city is Georgetown, 2.0 km away.

Topography around Halton Hills

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

Within 3 km, the terrain around Halton Hills has only modest variations in elevation — a maximum elevation change of 115 m around an average of 268 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 303 m; within 80 km, significant variations in elevation — a maximum elevation change of 470 m.

The land around Halton Hills is covered by trees (46%) and cropland (20%) within 3 km, trees (40%) and cropland (26%) within 16 km, and cropland (37%) and trees (27%) within 80 km.

3 km
115 m
16 km
303 m
80 km
470 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Georgetown 2.0 km · Brampton 14 km · Milton 14 km · Mississauga 23 km · Caledon 26 km · Guelph 28 km · West Humber-Clairville 28 km · Eringate-Centennial-West Deane 28 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 Halton Hills (43.6403°, -79.9315°, elevation 262 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).