Bismarck in Summer
In summer (June, July and August), Bismarck sees average daytime highs around 79°F and overnight lows near 57°F, with 9.1 in of rain over about 28 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Over the season highs climb from about 72°F in early June to 79°F by late August. The sky is clear or mostly clear about 46% of the time across summer, and the air most often feels dry.
Summer is Bismarck's best season of the year to visit on our travel score. For the whole year in context, see Bismarck's year-round climate.
- Avg daytime high
- 79°F
- warmest season of the year
- Avg overnight low
- 57°F
- Rainfall
- 9.1 in
- 28 wet days
- Avg wind
- 9 mph
- Travel score
- 6.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Bismarck in Summer
Over the season highs climb from about 72°F in early June to 79°F by late August.
A typical summer day in Bismarck reaches about 79°F and drops to 57°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Bismarck
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Bismarck weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 22° / 5° | 0.6 | 4.5 | 4.8 | 8.8 | 0.0 |
| Feb | 26° / 9° | 0.7 | 4.4 | 4.6 | 10 | 0.0 |
| Mar | 38° / 20° | 1.0 | 5 | 4 | 11.6 | 0.2 |
| Apr | 53° / 32° | 1.8 | 7.5 | 2.9 | 13.3 | 3.1 |
| May | 66° / 44° | 2.9 | 9.8 | 0.4 | 14.8 | 5.9 |
| Jun | 75° / 55° | 3.8 | 11.1 | 0 | 15.6 | 6.7 |
| Jul | 81° / 60° | 3.0 | 9.8 | 0 | 15.3 | 6.8 |
| Aug | 81° / 57° | 2.3 | 7.4 | 0 | 14 | 7.2 |
| Sep | 71° / 48° | 1.8 | 6.5 | 0 | 12.4 | 7.2 |
| Oct | 55° / 35° | 1.8 | 6.5 | 1.5 | 10.6 | 4.0 |
| Nov | 38° / 22° | 0.8 | 4.1 | 3.5 | 9.2 | 0.2 |
| Dec | 26° / 10° | 0.7 | 4.4 | 4.9 | 8.4 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 46% of the time across summer.
Chance of precipitation in Summer
Bismarck gets around 9.1 in of rain over 28 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 9 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 24 min in early June to 13 h 12 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.3 kWh/m².
Hazard calendar for Bismarck
In summer, Bismarck overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Bismarck's rainy season runs April–October, when most of the year's rain falls.
Is summer a good time to visit Bismarck?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Bismarck for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Bismarck in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Bismarck sees daytime highs around 79°F and nights near 57°F. Pack light clothes and sun protection. Worth having: rain gear. About 28 days see rain.
UV index in Bismarck in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Bismarck peaks around June 22 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 4 | 6 | 8 | 8 | 6 | 5 | 4 | 2 | 1 |
| Level | Low | Low | Moderate | Moderate | High | Very high | Very high | High | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 5 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Bismarck?
Bismarck sits at 46.8°N, 100.8°W, 1,686 ft above sea level, in United States. The nearest listed city is Mandan, 5.0 mi away.
Topography around Bismarck
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Bismarck.
Within 2 miles, the terrain around Bismarck has only modest variations in elevation — a maximum elevation change of 285 ft around an average of 1,713 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 505 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 915 ft.
The land around Bismarck is covered by artificial surfaces (54%) and trees (23%) within 2 miles, grassland (63%) and cropland (20%) within 10 miles, and grassland (62%) and cropland (34%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Bismarck (46.8083°, -100.7837°, elevation 1,686 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.