Hannibal, United States experiences average highs of 19°C (66°F) and lows of 9°C (48°F) throughout the year. Rainfall is moderate, averaging about 9 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Hannibal, United States Weather & Climate 2026
Monthly climate averages for Hannibal, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–May 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 19°C / 9°C
Feels Like 18°C / 7°C
Rainy Days 9
Rainfall 85 mm
Sunshine 9 h
Humidity 68%
Wind Speed 18 km/h
Dew Point 8°C
Snow Days 4 days
Frost Days 12 days
Hottest Month
31°C
July
Avg Low22°C
Rain10days
Coldest Month
-5°C
January
Avg High3°C
Rain8days
Driest Month
7days
February
Avg High7°C
Avg Low-3°C
Windiest Month
21 km/h
April (Gusts 46)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures.
Sun Position
Sunrise 05:38
Daylight 15h
Sunset 20:36
Live conditions—
Hannibal on the map · live conditions
Hannibal, United States
- Continent
- Americas
- Country
- United States
- City
- Hannibal
- Population
- 17.8K
- Elevation
- 153 m
- Coordinates
- 39.71°, -91.36°
Seasonal Breakdown
Spring
Mar–May
Avg High 19°C
Avg Low 9°C
Rain 12 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 30°C
Avg Low 21°C
Rain 10 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 -3°C
Rain 7 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: 3°C / -5°C . Feb: 7°C / -3°C . Mar: 13°C / 3°C . Apr: 19°C / 8°C . May: 24°C / 14°C . Jun: 30°C / 20°C . Jul: 31°C / 22°C . Aug: 30°C / 21°C . Sep: 27°C / 18°C . Oct: 20°C / 11°C . Nov: 12°C / 4°C . Dec: 7°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 55 mm. Feb: 50 mm. Mar: 108 mm. Apr: 107 mm. May: 119 mm. Jun: 104 mm. Jul: 116 mm. Aug: 87 mm. Sep: 72 mm. Oct: 86 mm. Nov: 65 mm. Dec: 52 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 70%. Feb: 65%. Mar: 65%. Apr: 64%. May: 69%. Jun: 66%. Jul: 71%. Aug: 71%. Sep: 67%. Oct: 65%. Nov: 67%. Dec: 70%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 19 km/h . Mar: 21 km/h . Apr: 21 km/h . May: 18 km/h . Jun: 16 km/h . Jul: 14 km/h . Aug: 14 km/h . Sep: 15 km/h . Oct: 18 km/h . Nov: 18 km/h . Dec: 19 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. 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: 7 days. Feb: 6 days. Mar: 2 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: 4 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 32°C | Jul · 31°C |
| Coldest month | Jan 2025 · -7°C | Jan · -5°C |
| Wettest month | Jul 2025 · 180 mm | May · 119 mm |
| Windiest month | Mar 2025 · 24 km/h | Apr · 21 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Good May best
Excellent June best
Excellent July
Fair August best
Excellent September best
Excellent October best
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 3°C / -5°C | -1°C / -10°C | 8days (55 mm) Wet | 5.6h Fair | 70% Muggy | 2.6 Moderate | Poor | View Details |
| February | 7°C / -3°C | 3°C / -8°C | 7days (50 mm) Good | 7h Good | 65% Muggy | 3.8 Moderate | Poor | View Details |
| March | 13°C / 3°C | 10°C / -1°C | 11days (108 mm) Wet | 7.7h Good | 65% Muggy | 5 Moderate | Poor | View Details |
| April | 19°C / 8°C | 17°C / 5°C | 11days (107 mm) Wet | 9.1h Good | 64% Muggy | 5.9 High | Good | View Details |
| May best | 24°C / 14°C | 24°C / 13°C | 14days (119 mm) Wet | 10.1h Excellent | 69% Muggy | 7 High | Excellent | View Details |
| June best | 30°C / 20°C | 32°C / 21°C | 10days (104 mm) Wet | 12.1h Excellent | 66% Muggy | 7.3 Very High | Excellent | View Details |
| July | 31°C / 22°C | 35°C / 24°C | 10days (116 mm) Wet | 11.9h Excellent | 71% Muggy | 7.4 Very High | Fair | View Details |
| August best | 30°C / 21°C | 33°C / 23°C | 10days (87 mm) Wet | 11.1h Excellent | 71% Muggy | 6.9 High | Excellent | View Details |
| September best | 27°C / 18°C | 29°C / 18°C | 7days (72 mm) Good | 10.1h Excellent | 67% Muggy | 5.7 High | Excellent | View Details |
| October best | 20°C / 11°C | 19°C / 9°C | 10days (86 mm) Wet | 7.8h Good | 65% Muggy | 4.3 Moderate | Good | View Details |
| November | 12°C / 4°C | 9°C / 0°C | 7days (65 mm) Good | 6.8h Fair | 67% Muggy | 3 Moderate | Poor | View Details |
| December | 7°C / -1°C | 3°C / -5°C | 7days (52 mm) Good | 5.7h Fair | 70% Muggy | 2.2 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Hannibal 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 Hannibal, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Hannibal is July, with average daytime highs of 31°C (87°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Hannibal is January, with average overnight lows of -5°C (23°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Hannibal is May, averaging 119mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Hannibal runs through May, March, April, June, with the heaviest rainfall in May. Based on 10-year averages for Hannibal.
Hannibal receives approximately 105 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Hannibal.
The least favorable months to visit Hannibal are January, February, December, primarily due to very cold temperatures. For the best conditions, consider May, June, August, September, October instead.
The annual average UV index in Hannibal is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Hannibal is 68%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Hannibal receives snow. Months with snowfall average 4 snow days and 7 cm (3 in) of accumulation, with about 12 frost days during winter.
Average wind speeds in Hannibal are 18 km/h (11 mph). The windiest month is April with peak winds reaching 21 km/h (13 mph) (gusts up to 46 km/h / 28 mph).
Hannibal averages 6 clear-sky days per month with overall cloud cover around 55%. The clearest skies occur in September.
The annual average dew point in Hannibal is 8°C (46°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Hannibal 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 Hannibal ranges from 7°C (45°F) to 18°C (64°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 Hannibal. It earns a climate score of 7.7/10 with Excellent.
For June in Hannibal, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 30°C (86°F) and 10 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.
Last updated: