Norfolk County weather in May

In May, Norfolk County sees average daytime highs of 17°C and overnight lows near 10°C, with 93 mm of rain across 12.2 wet days and about 14.4 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 20°C by the end. The sky is clear or mostly clear about 27% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of May to 14 h 54 min by month's end. Set against the rest of the year, May is Norfolk County's 5th-clearest and 8th-windiest month. For the whole year in context, see Norfolk County's year-round climate.

Daytime high
17°
5th warmest
Overnight low
10°
8th coldest
Rainfall
93 mm
12.2 wet days
Daylight
14 h 24 min
5:05 AM – 7:31 PM
Cloud cover
61%
5th clearest
Wind
16 km/h
8th windiest
Solar energy
6.15 kWh/m²
Travel score
5.2
out of 10

Norfolk County is city in Ontario, Canada.

Founded
1792

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 14°C in the first days to 20°C by the end.

A typical May day in Norfolk County reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 23°C. Set against its neighbours, May runs about 7°C warmer than April and about 6°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1147
2147
3148
4148
5158
6158
7158
8159
9169
10169
11169
12169
131710
141710
151710
161710
171710
181811
191811
201811
211811
221912
231912
241912
251912
262012
272013
282013
292013
302013
312114

How May really feels in Norfolk County

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.

Norfolk County weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -7°7611.88.69.20.0
Feb-1° / -7°598.96.710.20.0
Mar / -3°7510.14.711.60.1
Apr10° / 97121.513.12.1
May17° / 10°9312.2014.45.2
Jun23° / 16°10812.3015.16.5
Jul25° / 19°10411.6014.86.6
Aug25° / 18°8910.5013.76.9
Sep21° / 14°859.4012.36.6
Oct14° / 8911.60.110.84.0
Nov / 8110.52.49.51.1
Dec / -2°7811.77.18.90.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 27% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 58%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24060
34159
44159
54159
64159
74060
84060
94060
104060
114060
123961
134060
144060
154060
164060
174060
184060
194159
204159
214357
224357
234456
244555
254654
264654
274654
284654
294654
304753
314753

Chance of precipitation in May

Any precipitation

Norfolk County gets around 93 mm of rain over 12.2 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
140
240
340
441
541
641
741
841
941
1041
1141
1241
1341
1440
1540
1640
1739
1839
1939
2038
2138
2238
2337
2437
2537
2637
2737
2837
2937
3037
3137

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 81% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1963100
2963100
3954100
4944200
5935200
6935200
7916300
8916300
9907300
10897400
11888400
12888400
13869500
14859510
158310610
168211610
178111710
188012710
197812820
207613920
217613920
2273141030
2373141030
2470151131
2569151141
2667161241
2766161251
2864171351
2963171361
3062181361
3161181461

Wind in May

Winds average 16 km/h in May.

Across May, daily wind ranges from about 16 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
116light breeze
216light breeze
316light breeze
416light breeze
516light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over May. Sunrise moves from 5:23 AM to 4:52 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)
113.85:237:14
213.95:227:15
313.95:207:17
414.05:197:18
514.05:187:19
614.15:167:20
714.15:157:21
814.15:147:22
914.25:137:23
1014.25:117:24
1114.35:107:26
1214.35:097:27
1314.35:087:28
1414.45:077:29
1514.45:067:30
1614.45:057:31
1714.55:037:32
1814.55:027:33
1914.55:027:34
2014.65:017:35
2114.65:007:36
2214.64:597:37
2314.74:587:38
2414.74:577:39
2514.74:567:40
2614.84:567:41
2714.84:557:42
2814.84:547:43
2914.84:547:44
3014.94:537:45
3114.94:527:46

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.15 kWh/m².

For context, solar energy here swings from a low near 1.35 kWh/m² to a high of 6.67 kWh/m² in June across the year — May's 6.15 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.8Bright
45.8Bright
55.8Bright
65.9Bright
75.9Bright
85.9Bright
95.9Bright
106.0Bright
116.0Bright
126.0Intense
136.0Intense
146.1Intense
156.1Intense
166.1Intense
176.2Intense
186.2Intense
196.2Intense
206.3Intense
216.3Intense
226.3Intense
236.3Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.5Intense
296.5Intense
306.5Intense
316.5Intense
Planning a trip in May

Is May a good time to visit Norfolk County?

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

5.2
Sightseeing
5th-best month of the year
1.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Norfolk County for sightseeing.

What to pack for Norfolk County in May

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

In May, Norfolk County sees daytime highs around 17°C and nights near 10°C. Pack sun protection. Worth having: rain gear. About 12 days see rain.

sun protectionrain gear

Sea temperature near Norfolk County in May

The nearest coast averages about 9°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 23 km away) is warmest in August at about 23°C and coldest in February near 1°C.

It's comfortable for a long swim from Jul 6 to Sep 19 — about 2.5 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr4Bracing
May9Bracing
Jun17Cool
Jul22Refreshing
Aug23Refreshing
Sep21Refreshing
Oct16Cool
Nov10Bracing
Dec6Bracing

UV index in Norfolk County in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Norfolk County peaks around June 23 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 23UV 8Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun8Very high
Jul8Very high
Aug7High
Sep6High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Norfolk County 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 Norfolk County is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1116 µg/m³Nov 187 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb10Good
Mar12Moderate
Apr14Moderate
May16Moderate
Jun16Moderate
Jul16Moderate
Aug14Moderate
Sep12Good
Oct8Good
Nov7Good
Dec7Good
Location & terrain

Where is Norfolk County?

Norfolk County sits at 42.8°N, 80.4°W, 235 m above sea level, in Canada. The nearest listed city is Tillsonburg, 28 km away.

Topography around Norfolk County

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

Within 3 km, the terrain around Norfolk County has only modest variations in elevation — a maximum elevation change of 38 m around an average of 237 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 111 m; within 80 km, significant variations in elevation — a maximum elevation change of 369 m.

The land around Norfolk County is covered by trees (44%) and cropland (40%) within 3 km, cropland (52%) and trees (31%) within 16 km, and water (41%) and cropland (34%) within 80 km.

3 km
38 m
16 km
111 m
80 km
369 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Tillsonburg 28 km · Brant 33 km · Brantford 35 km · Woodstock 45 km · Ancaster 54 km · Christopher-Champlain 58 km · Cambridge 59 km · Fiddlesticks 63 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 Norfolk County (42.8334°, -80.383°, elevation 235 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).