St. Catharines weather in April

In April, St. Catharines sees average daytime highs of 9°C and overnight lows near 4°C, with 97 mm of precipitation across 11.7 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 7°C in the first days to 11°C by the end. The sky is clear or mostly clear about 24% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 48 min by month's end. Set against the rest of the year, April is St. Catharines's 7th-clearest and 7th-windiest month. For the whole year in context, see St. Catharines's year-round climate.

Daytime high
7th warmest
Overnight low
6th coldest
Precipitation
97 mm
11.7 wet days
Daylight
13 h 12 min
5:42 AM – 6:53 PM
Cloud cover
65%
7th clearest
Wind
15 km/h
7th windiest
Solar energy
4.88 kWh/m²
Travel score
1.8
out of 10

St. Catharines is city in Ontario, Canada.

Air quality
Good
PM2.5 7 µg/m³ · 2019
Density
1,410/km²
people per km²
Founded
1783

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 7°C in the first days to 11°C by the end.

A typical April day in St. Catharines reaches about 9°C in the afternoon and slips back to 4°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 4°C and 14°C. Set against its neighbours, April runs about 6°C warmer than March and about 6°C cooler than May.

-5°10°15°20°151015202530
Avg high (°C)Avg low (°C)
161
271
371
471
572
672
782
882
982
1083
1183
1293
1393
1493
1594
1694
17104
18104
19104
20104
21105
22105
23115
24115
25115
26116
27116
28126
29126
30126

How April really feels in St. Catharines

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 15 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
15
wind chill below the day's low

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

St. Catharines weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-0° / -5°7511.999.20.0
Feb-0° / -6°599710.20.0
Mar / -2°7310.44.611.60.1
Apr / 9711.71.813.11.8
May15° / 10°8311.4014.44.5
Jun21° / 16°9111.1015.16.4
Jul25° / 20°8810.8014.96.9
Aug24° / 19°759.9013.87.1
Sep21° / 16°859.8012.36.5
Oct14° / 9212.10.110.84.1
Nov / 8210.829.51.3
Dec / -1°7711.66.68.90.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 62%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13664
23664
33664
43664
53664
63664
73565
83664
93664
103664
113763
123763
133763
143862
153862
163862
173862
183862
193862
203862
213961
223961
233961
244060
254060
264060
274159
284159
294258
304258

Chance of precipitation in April

Any precipitationSnow

St. Catharines gets around 97 mm of rain and snow over 11.7 wet days in April, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 39% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
13911
23911
33911
43911
53911
63911
73910
83910
9399
10389
11388
12387
13377
14376
15375
16385
17384
18384
19383
20383
21392
22392
23392
24391
25391
26391
27391
28390
29390
30380

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April 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%151015202530
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

Wind in April

Winds average 15 km/h in April.

Across April, daily wind ranges from about 14 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
616light breeze
716light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1815light breeze
1915light breeze
2015light breeze
2115light breeze
2215light breeze
2315light breeze
2415light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 6:08 AM to 5:19 AM, and sunset from 6:35 PM to 7:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:086:35
212.56:076:36
312.56:056:37
412.66:036:38
512.66:016:40
612.75:596:41
712.75:586:42
812.85:566:43
912.85:546:44
1012.95:526:46
1112.95:506:47
1213.05:496:48
1313.05:476:49
1413.15:456:50
1513.15:436:51
1613.25:426:53
1713.25:406:54
1813.35:386:55
1913.35:376:56
2013.45:356:57
2113.45:336:59
2213.55:327:00
2313.55:307:01
2413.65:297:02
2513.65:277:03
2613.65:257:04
2713.75:247:06
2813.75:227:07
2913.85:217:08
3013.85:197:09

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.88 kWh/m².

For context, solar energy here swings from a low near 1.28 kWh/m² to a high of 6.32 kWh/m² in June across the year — April's 4.88 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.5Bright
54.5Bright
64.5Bright
74.6Bright
84.6Bright
94.6Bright
104.7Bright
114.7Bright
124.8Bright
134.8Bright
144.8Bright
154.9Bright
164.9Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.2Bright
235.2Bright
245.2Bright
255.3Bright
265.3Bright
275.3Bright
285.4Bright
295.4Bright
305.5Bright
Planning a trip in April

Is April a good time to visit St. Catharines?

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

1.8
Sightseeing
7th-best month of the year
0.0
Beach & pool
7th-best month of the year

April is a weaker month for outdoor sightseeing in St. Catharines.

What to pack for St. Catharines in April

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

In April, St. Catharines sees daytime highs around 9°C and nights near 4°C. Pack a warm layer. Worth having: rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

Sea temperature near St. Catharines in April

The nearest coast averages about 4°C in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 25 km away) is warmest in August at about 22°C and coldest in February near 3°C.

It's comfortable for a long swim from Jul 17 to Sep 6 — about 1.7 months when the water holds above 20°C.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan4Bracing
Feb3Bracing
Mar3Bracing
Apr4Bracing
May7Bracing
Jun15Bracing
Jul20Refreshing
Aug22Refreshing
Sep19Cool
Oct13Bracing
Nov8Bracing
Dec5Bracing

UV index in St. Catharines in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in St. Catharines peaks around June 19 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 19UV 8Dec 21UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May6High
Jun8Very high
Jul7Very high
Aug6High
Sep5High
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is St. Catharines?

St. Catharines sits at 43.2°N, 79.2°W, 102 m above sea level, in Canada. The nearest listed city is Thorold, 7.0 km away.

Topography around St. Catharines

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

Within 3 km, the terrain around St. Catharines has only modest variations in elevation — a maximum elevation change of 47 m around an average of 100 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 193 m; within 80 km, significant variations in elevation — a maximum elevation change of 483 m.

The land around St. Catharines is covered by artificial surfaces (51%) and trees (33%) within 3 km, water (33%) and trees (20%) within 16 km, and water (41%) and trees (24%) within 80 km.

3 km
47 m
16 km
193 m
80 km
483 m
treesgrasslandcroplandartificial surfaceswater
April weather nearby: Thorold 7.0 km · Niagara-on-the-Lake 16 km · Niagara Falls 16 km · Niagara Falls 17 km · Welland 21 km · Grimsby 26 km · Grand Island 27 km · Port Colborne 30 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 St. Catharines (43.1713°, -79.2427°, elevation 102 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).