Mandan, United States experiences average highs of 13°C (55°F) and lows of 3°C (37°F) throughout the year. The climate is relatively dry, with only 6 rainy days per month on average. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 0.7°C (1.3°F) across the available records.
Mandan, United States Weather & Climate 2026
Monthly climate averages for Mandan, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Apr–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: May, June, July, August, September
UV Index
5
Low
Temperature 13°C / 3°C
Feels Like 10°C / -1°C
Rainy Days 6
Rainfall 42 mm
Sunshine 9 h
Humidity 66%
Wind Speed 23 km/h
Dew Point 2°C
Snow Days 6 days
Frost Days 19 days
Hottest Month
29°C
July
Avg Low18°C
Rain10days
Coldest Month
-13°C
January
Avg High-4°C
Rain3days
Driest Month
3days
January
Avg High-4°C
Avg Low-13°C
Windiest Month
26 km/h
April (Gusts 47)
Worst Time to Visit
Consider avoiding January, February, November, December due to very cold temperatures.
Sun Position
Sunrise 05:50
Daylight 15.8h
Sunset 21:41
Live conditions—
Mandan on the map · live conditions
Mandan, United States
- Continent
- Americas
- Country
- United States
- City
- Mandan
- Population
- 21.4K
- Elevation
- 502 m
- Coordinates
- 46.83°, -100.89°
Seasonal Breakdown
Spring
Mar–May
Avg High 13°C
Avg Low 1°C
Rain 7 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 28°C
Avg Low 16°C
Rain 9 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 15°C
Avg Low 5°C
Rain 5 days/mo
1/3 best months
Winter
Dec–Feb
Avg High -2°C
Avg Low -12°C
Rain 4 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 / -13°C . Feb: -2°C / -12°C . Mar: 6°C / -6°C . Apr: 12°C / 0°C . May: 20°C / 8°C . Jun: 27°C / 15°C . Jul: 29°C / 18°C . Aug: 28°C / 17°C . Sep: 24°C / 13°C . Oct: 14°C / 5°C . Nov: 6°C / -3°C . Dec: -2°C / -10°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 10 mm. Feb: 12 mm. Mar: 22 mm. Apr: 52 mm. May: 73 mm. Jun: 69 mm. Jul: 66 mm. Aug: 54 mm. Sep: 50 mm. Oct: 45 mm. Nov: 21 mm. Dec: 24 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 76%. Feb: 67%. Mar: 67%. Apr: 63%. May: 60%. Jun: 59%. Jul: 62%. Aug: 63%. Sep: 61%. Oct: 64%. Nov: 70%. Dec: 74%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 23 km/h . Feb: 23 km/h . Mar: 25 km/h . Apr: 26 km/h . May: 24 km/h . Jun: 24 km/h . Jul: 20 km/h . Aug: 21 km/h . Sep: 23 km/h . Oct: 24 km/h . Nov: 23 km/h . Dec: 24 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 8h. Mar: 9h. Apr: 9h. May: 11h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 10h. Oct: 8h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. Nov: UV 2. 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: 9 days. Mar: 8 days. Apr: 5 days. May: 1 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 2 days. Nov: 5 days. Dec: 10 days.
Climate Trends
Average highs have cooled by 0.7°C (1.3°F) 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 · 29°C | Jul · 29°C |
| Coldest month | Feb 2025 · -17°C | Jan · -13°C |
| Wettest month | May 2025 · 135 mm | May · 73 mm |
| Windiest month | Oct 2025 · 26 km/h | Apr · 26 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May best
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -4°C / -13°C | -9°C / -18°C | 3days (10 mm) Excellent | 5.9h Fair | 76% Humid | 2.1 Moderate | Poor | View Details |
| February | -2°C / -12°C | -7°C / -18°C | 4days (12 mm) Good | 7.6h Good | 67% Muggy | 3.1 Moderate | Poor | View Details |
| March | 6°C / -6°C | 1°C / -11°C | 5days (22 mm) Good | 8.7h Good | 67% Muggy | 4.4 Moderate | Poor | View Details |
| April | 12°C / 0°C | 8°C / -5°C | 7days (52 mm) Good | 9.4h Good | 63% Muggy | 5.4 High | Poor | View Details |
| May best | 20°C / 8°C | 18°C / 5°C | 9days (73 mm) Wet | 11.3h Excellent | 60% Moderate | 6.3 High | Good | View Details |
| June best | 27°C / 15°C | 26°C / 13°C | 9days (69 mm) Wet | 12.8h Excellent | 59% Moderate | 6.7 High | Excellent | View Details |
| July best | 29°C / 18°C | 30°C / 18°C | 10days (66 mm) Wet | 13.1h Excellent | 62% Muggy | 7.2 Very High | Excellent | View Details |
| August best | 28°C / 17°C | 28°C / 16°C | 7days (54 mm) Good | 11.6h Excellent | 63% Muggy | 6.4 High | Excellent | View Details |
| September best | 24°C / 13°C | 22°C / 10°C | 7days (50 mm) Good | 9.5h Good | 61% Muggy | 5.1 High | Excellent | View Details |
| October | 14°C / 5°C | 10°C / 0°C | 5days (45 mm) Good | 7.7h Good | 64% Muggy | 3.6 Moderate | Fair | View Details |
| November | 6°C / -3°C | 1°C / -8°C | 4days (21 mm) Good | 6.3h Fair | 70% Muggy | 2.3 Moderate | Poor | View Details |
| December | -2°C / -10°C | -7°C / -16°C | 5days (24 mm) Good | 5.4h Fair | 74% Muggy | 1.8 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Mandan are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Mandan, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Mandan is July, with average daytime highs of 29°C (85°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Mandan is January, with average overnight lows of -13°C (9°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Mandan is May, averaging 73mm of precipitation across 9 rainy days. An umbrella or waterproof jacket is essential.
Mandan receives approximately 109 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Mandan.
The least favorable months to visit Mandan are January, February, November, December, primarily due to very cold temperatures. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Mandan is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Mandan is 66%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Mandan receives snow. Months with snowfall average 6 snow days and 9 cm (4 in) of accumulation, with about 19 frost days during winter.
Average wind speeds in Mandan are 23 km/h (14 mph). The windiest month is April with peak winds reaching 26 km/h (16 mph) (gusts up to 47 km/h / 29 mph).
Mandan averages 5 clear-sky days per month with overall cloud cover around 53%. The clearest skies occur in September.
The annual average dew point in Mandan is 2°C (36°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Mandan has a Hot-Summer Continental climate, classified as Dfa under the Köppen system. Continental climates experience extreme temperature ranges — hot summers and cold, snowy winters.
The 'feels like' temperature in Mandan ranges from -1°C (30°F) to 10°C (50°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Mandan. It earns a climate score of 8.9/10 with Excellent.
For June in Mandan, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 27°C (80°F) and 9 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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