Brockville weather in May

In May, Brockville sees average daytime highs of 19°C and overnight lows near 8°C, with 89 mm of precipitation across 11.6 wet days and about 14.6 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 21°C by the end. The sky is clear or mostly clear about 22% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 hours at the start of May to 15 h 06 min by month's end. Set against the rest of the year, May is Brockville's 5th-clearest and 8th-windiest month. For the whole year in context, see Brockville's year-round climate.

Daytime high
19°
5th warmest
Overnight low
8th coldest
Precipitation
89 mm
11.6 wet days
Daylight
14 h 36 min
4:41 AM – 7:17 PM
Cloud cover
65%
5th clearest
Wind
11 km/h
8th windiest
Solar energy
5.62 kWh/m²
Travel score
5.6
out of 10

Brockville is city in Eastern Ontario, Canada.

Founded
1784

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 16°C in the first days to 21°C by the end.

A typical May day in Brockville reaches about 19°C in the afternoon and slips back to 8°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 12°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)
1165
2165
3166
4166
5176
6176
7176
8177
9177
10187
11187
12187
13187
14187
15188
16198
17198
18198
19198
20198
21209
22209
23209
24209
25209
262010
272110
282110
292110
302110
312111

How May really feels in Brockville

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.

Brockville weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -11°7511.89.790.0
Feb-2° / -11°619.68.210.10.0
Mar / -5°7711.36.511.60.2
Apr12° / 10411.92.513.22.8
May19° / 8911.60.114.65.6
Jun23° / 13°10211.6015.36.5
Jul26° / 17°9611.90156.4
Aug25° / 16°9511.6013.96.7
Sep21° / 12°9410012.36.5
Oct14° / 10812.20.310.73.7
Nov / 8811.83.39.40.8
Dec / -5°8512.88.48.70.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 16% of May, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23565
33664
43664
53664
63664
73763
83763
93763
103763
113763
123763
133763
143763
153862
163961
173961
183961
194060
203961
213961
224060
233961
243961
254060
263961
273961
283862
293862
303862
313862

Chance of precipitation in May

Any precipitationSnow

Brockville gets around 89 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 38% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1382
2381
3381
4381
5381
6381
7381
8381
9381
10380
11370
12370
13370
14370
15360
16360
17360
18360
19360
20360
21360
22360
23360
24370
25370
26370
27380
28380
29380
30380
31380

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 87% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
197300
296400
396400
496400
596400
695500
795500
895500
995500
1094600
1193610
1293610
1393610
1492710
1592710
1691810
1789920
1889920
19871030
20861130
21841240
22831241
23811351
24791461
25781471
26771571
27751681
28751681
29731791
30721792
317018102

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 hours at the start of May to 15 h 06 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 5:01 AM to 4:28 AM, and sunset from 6:59 PM to 7:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:016:59
214.04:597:00
314.14:587:02
414.14:567:03
514.24:557:04
614.24:547:05
714.24:527:06
814.34:517:08
914.34:497:09
1014.44:487:10
1114.44:477:11
1214.44:467:12
1314.54:447:14
1414.54:437:15
1514.64:427:16
1614.64:417:17
1714.64:407:18
1814.74:397:19
1914.74:387:20
2014.74:377:22
2114.84:367:23
2214.84:357:24
2314.84:347:25
2414.94:337:26
2514.94:327:27
2614.94:317:28
2715.04:307:29
2815.04:307:30
2915.04:297:31
3015.14:287:32
3115.14:287:33

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.62 kWh/m².

For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 5.97 kWh/m² in June across the year — May's 5.62 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.3Bright
55.4Bright
65.4Bright
75.4Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.7Bright
255.7Bright
265.7Bright
275.8Bright
285.8Bright
295.8Bright
305.8Bright
315.8Bright
Planning a trip in May

Hazard calendar for Brockville

In seasonPeak

None of Brockville's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Brockville sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Brockville?

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

5.6
Sightseeing
5th-best month of the year
2.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Brockville for sightseeing.

What to pack for Brockville in May

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

In May, Brockville sees daytime highs around 19°C and nights near 8°C. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

UV index in Brockville 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 Brockville peaks around July 13 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 13UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5Moderate
May7High
Jun7High
Jul8Very high
Aug5Moderate
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Brockville?

Brockville sits at 44.6°N, 75.7°W, 93 m above sea level, in Canada. The nearest listed city is Watertown, 71 km away.

Topography around Brockville

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

Within 3 km, the terrain around Brockville has only modest variations in elevation — a maximum elevation change of 59 m around an average of 92 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 81 m; within 80 km, significant variations in elevation — a maximum elevation change of 597 m.

The land around Brockville is covered by trees (37%) and water (31%) within 3 km, trees (51%) within 16 km, and trees (63%) within 80 km.

3 km
59 m
16 km
81 m
80 km
597 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Watertown 71 km · Kingston 75 km · Stittsville 75 km · Bridlewood 78 km · Kanata 81 km · Nepean 83 km · Gloucester 84 km · Alta Vista 88 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 Brockville (44.5913°, -75.687°, elevation 93 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).