May 21 is generally a great time to visit Hamilton. While there is a slight chance of rain (32%), showers are usually brief. Expect comfortable 16°C weather. Expect a bustling atmosphere in Hamilton right now—this is when the city truly comes alive with visitors.
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Essential Travel Info for Hamilton
Currency
NZD
$ New Zealand dollar
Language
English
+2 more
Driving
Left side
Safety
Very High Safety
GPI: 1.269
Hamilton Weather Forecast for May 21
"Mild & Comfortable. Expect average highs of 15.9°C. 32% chance of rain."
What to Wear in Hamilton in May
Based on historical data for May 21, Hamilton typically experiences temperatures between 8.5°C and 15.9°C. We recommend packing light jacket, long pants, umbrella to stay comfortable. With a 32% chance of rain, keeping a raincoat or umbrella handy is a smart move.
Complete Packing Guide
Weekly breakdown & essential items for Hamilton
Smart Suitcase
- Light Jacket
- Long Pants
- Umbrella
Average High
15.9°C
Daytime Peak
Average Low
8.5°C
Nighttime Low
Feels Like
15.9°C
🌤️ Feels accurate
Rain Chance
32%
Avg 2.4mm if it rains
Cloud Cover
60%
Overcast
Pressure
1016.7 hPa
High volatility
Hamilton Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 96% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 200 min to burn
Type III-IV
🟡 300 min to burn
Type V-VI
🟢 500 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
13.2°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in New Zealand
Flight Traffic
High
100/100 pressure index
Health Advisory
Required
1 vaccine • View Details →
Landing Slots
~13
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Hamilton
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
08:17
☀️ Noon
13:16
🌇 Sunset
18:15
⏱️ Daylight
9h 57m
Wind Speed
18.7 km/h
Gentle breeze
Sunshine
7.0 hrs
Direct Sun (Cloud-free)
Humidity
84%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Hamilton
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in Hamilton
Travel Comfort Index
Real-time tourism conditions
Weather Quality
⛅ Good
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Rapid pressure changes detected. High risk for meteosensitive people.
Weather unlikely to affect joint pain.
Fish are active due to pressure changes.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Active seismic zone. Multiple earthquakes per year.
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, Hamilton on May 21 averages 15.9°C with a 32% precipitation probability. Wedding/Outdoor Event Score: 82/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Hamilton Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
May 15
16.6°C • 27% rain
Score
87
May 16
16.6°C • 29% rain
Score
86
May 18
16.4°C • 29% rain
Score
86
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (May 21) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Hamilton Worth Visiting on May 21?
Planning a trip to Hamilton on May 21? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 15.9°C with a 32% historical precipitation risk.
✈️ Travel Logistics: Approximately 13 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 6 vaccinations are recommended for New Zealand, including COVID-19.
📊 Historical Extremes: The hottest May 21 recorded in the last 30 years saw temperatures hit 17.5°C in 2024, while the coldest dropped to 0.2°C in 2017.