Hamilton, United States experiences average highs of 18°C (64°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have cooled by 0.6°C (1.1°F) across the available records.
Hamilton, United States Weather & Climate 2026
Monthly climate averages for Hamilton, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.5/10
Best: May, June, August, September, October
UV Index
5
Low
Temperature 18°C / 9°C
Feels Like 17°C / 8°C
Rainy Days 11
Rainfall 95 mm
Sunshine 8 h
Humidity 70%
Wind Speed 17 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 13 days
Hottest Month
30°C
July
Avg Low21°C
Rain12days
Coldest Month
-3°C
January
Avg High4°C
Rain10days
Driest Month
7days
September
Avg High27°C
Avg Low17°C
Windiest Month
20 km/h
March (Gusts 45)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 06:12
Daylight 14.9h
Sunset 21:08
Live conditions—
Hamilton on the map · live conditions
Hamilton, United States
- Continent
- Americas
- Country
- United States
- City
- Hamilton
- Population
- 62.4K
- Elevation
- 181 m
- Coordinates
- 39.40°, -84.56°
Seasonal Breakdown
Spring
Mar–May
Avg High 18°C
Avg Low 8°C
Rain 13 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 29°C
Avg Low 20°C
Rain 12 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 20°C
Avg Low 11°C
Rain 8 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 6°C
Avg Low -2°C
Rain 10 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 4°C / -3°C . Feb: 8°C / -1°C . Mar: 13°C / 3°C . Apr: 18°C / 8°C . May: 23°C / 14°C . Jun: 28°C / 19°C . Jul: 30°C / 21°C . Aug: 29°C / 20°C . Sep: 27°C / 17°C . Oct: 20°C / 11°C . Nov: 12°C / 4°C . Dec: 7°C / 0°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 86 mm. Feb: 102 mm. Mar: 119 mm. Apr: 112 mm. May: 116 mm. Jun: 103 mm. Jul: 108 mm. Aug: 83 mm. Sep: 67 mm. Oct: 74 mm. Nov: 80 mm. Dec: 90 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 71%. Feb: 69%. Mar: 65%. Apr: 67%. May: 72%. Jun: 69%. Jul: 72%. Aug: 72%. Sep: 68%. Oct: 68%. Nov: 70%. Dec: 73%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 20 km/h . Mar: 20 km/h . Apr: 20 km/h . May: 17 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 13 km/h . Sep: 14 km/h . Oct: 17 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 4. Mar: UV 5. Apr: UV 6. May: UV 7. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 6. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 8 days. Feb: 6 days. Mar: 3 days. Apr: 1 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 2 days. Dec: 5 days.
Climate Trends
Average highs have cooled by 0.6°C (1.1°F) across the available records. Average rainfall is trending wetter by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 31°C | Jul · 30°C |
| Coldest month | Jan 2025 · -8°C | Jan · -3°C |
| Wettest month | Apr 2025 · 152 mm | Mar · 119 mm |
| Windiest month | Mar 2025 · 22 km/h | Mar · 20 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Good May best
Excellent June best
Excellent July
Good August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -3°C | 0°C / -8°C | 10days (86 mm) Wet | 5.1h Fair | 71% Muggy | 2.4 Moderate | Poor | View Details |
| February | 8°C / -1°C | 4°C / -6°C | 10days (102 mm) Wet | 6.3h Fair | 69% Muggy | 3.5 Moderate | Poor | View Details |
| March | 13°C / 3°C | 10°C / -1°C | 12days (119 mm) Wet | 7.5h Good | 65% Muggy | 4.8 Moderate | Poor | View Details |
| April | 18°C / 8°C | 16°C / 5°C | 12days (112 mm) Wet | 8.9h Good | 67% Muggy | 5.8 High | Good | View Details |
| May best | 23°C / 14°C | 24°C / 13°C | 14days (116 mm) Wet | 9.7h Good | 72% Muggy | 6.5 High | Excellent | View Details |
| June best | 28°C / 19°C | 30°C / 19°C | 12days (103 mm) Wet | 11.5h Excellent | 69% Muggy | 7 High | Excellent | View Details |
| July | 30°C / 21°C | 33°C / 23°C | 12days (108 mm) Wet | 11.7h Excellent | 72% Muggy | 7.3 Very High | Good | View Details |
| August best | 29°C / 20°C | 31°C / 22°C | 11days (83 mm) Wet | 11.2h Excellent | 72% Muggy | 6.8 High | Excellent | View Details |
| September best | 27°C / 17°C | 28°C / 18°C | 7days (67 mm) Good | 9.7h Good | 68% Muggy | 5.5 High | Excellent | View Details |
| October best | 20°C / 11°C | 19°C / 9°C | 9days (74 mm) Wet | 7.9h Good | 68% Muggy | 4.2 Moderate | Good | View Details |
| November | 12°C / 4°C | 9°C / 0°C | 9days (80 mm) Wet | 6.3h Fair | 70% Muggy | 2.8 Moderate | Poor | View Details |
| December | 7°C / 0°C | 4°C / -4°C | 10days (90 mm) Wet | 5h Fair | 73% Muggy | 2.1 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Hamilton are May, June, August, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Hamilton, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Hamilton is July, with average daytime highs of 30°C (86°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Hamilton is January, with average overnight lows of -3°C (26°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Hamilton is March, averaging 119mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Hamilton runs through May, March, April, June, with the heaviest rainfall in May. Based on 10-year averages for Hamilton.
Hamilton receives approximately 101 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Hamilton.
The least favorable months to visit Hamilton are January, February, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Hamilton is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Hamilton is 70%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Hamilton receives snow. Months with snowfall average 4 snow days and 6 cm (2 in) of accumulation, with about 13 frost days during winter.
Average wind speeds in Hamilton are 17 km/h (11 mph). The windiest month is March with peak winds reaching 20 km/h (13 mph) (gusts up to 45 km/h / 28 mph).
Hamilton averages 4 clear-sky days per month with overall cloud cover around 60%. The clearest skies occur in October.
The annual average dew point in Hamilton is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Hamilton has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Hamilton ranges from 8°C (46°F) to 17°C (63°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Hamilton. It earns a climate score of 8.4/10 with Excellent.
For June in Hamilton, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 28°C (82°F) and 12 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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