April 21 is generally a great time to visit St. John's. While there is a slight chance of rain (17%), showers are usually brief. Expect comfortable 28°C weather. It's a lively time to explore St. John's, with most attractions operating at full capacity.
View the full calendar
Essential Travel Info for St. John's
Currency
XCD
$ Eastern Caribbean dollar
Language
English
Driving
Left side
St. John's Weather Forecast for April 21
"Warm & Sunny. Expect average highs of 28.1°C. 17% chance of rain."
What to Wear in St. John's in April
Based on historical data for April 21, St. John's typically experiences temperatures between 24.4°C and 28.1°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (17% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for St. John's
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
28.1°C
Daytime Peak
Average Low
24.4°C
Nighttime Low
Feels Like
31.1°C
🔥 Feels warmer
Rain Chance
17%
Avg 1mm if it rains
Cloud Cover
46%
Light drizzle
Pressure
1014.9 hPa
Low volatility
St. John's Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
~ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 10:00
16:00 - 18:00
Type I-II
🔴 14 min to burn
Type III-IV
🟡 21 min to burn
Type V-VI
🟢 35 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
22.6°C
Humid/Sticky
Heat Index
31.1°C
Feels hotter
😐 Best outdoor time:
Morning hours (before 11 AM)
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
✅ Excellent Swimming Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Antigua and Barbuda
Flight Traffic
Busy
61/100 pressure index
Health Advisory
Required
2 vaccines • View Details →
Landing Slots
~14
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in St. John's
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:48
☀️ Noon
12:07
🌇 Sunset
18:25
⏱️ Daylight
12h 36m
Wind Speed
26.1 km/h
Moderate wind
Sunshine
11.5 hrs
Direct Sun (Cloud-free)
Humidity
72%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for St. John's
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in St. John's
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
Atlantic Hurricane Risk
Season: Jun - Nov
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, St. John's on April 21 averages 28.1°C with a 17% precipitation probability. Wedding/Outdoor Event Score: 93/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
St. John's Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (April 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is St. John's Worth Visiting on April 21?
Planning a trip to St. John's on April 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 28.1°C with a 17% historical precipitation risk.
✈️ Travel Logistics: Approximately 14 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Antigua and Barbuda, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 27.9°C (tropical bath). Wave conditions are generally fun waves with heights around 0.93m.
📊 Historical Extremes: The hottest April 21 recorded in the last 30 years saw temperatures hit 29.7°C in 2020, while the coldest dropped to 23.1°C in 2021.