Stillwater in Summer
In summer (June, July and August), Stillwater sees average daytime highs around 91°F and overnight lows near 71°F, with 9.6 in of rain over about 24 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 84°F in early June to 90°F by late August. The sky is clear or mostly clear about 52% of the time across summer, and the air most often feels muggy.
Summer is Stillwater's 3rd-best season to visit on our travel score. For the whole year in context, see Stillwater's year-round climate.
- Avg daytime high
- 91°F
- warmest season of the year
- Avg overnight low
- 71°F
- Rainfall
- 9.6 in
- 24 wet days
- Avg wind
- 7 mph
- Travel score
- 4.0
- 3rd-best season
- Months
- Jun · Jul · Aug
Temperature in Stillwater in Summer
Over the season highs climb from about 84°F in early June to 90°F by late August.
A typical summer day in Stillwater reaches about 91°F and drops to 71°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Stillwater
Once humidity and wind are folded in, summer brings about 78 days that feel above 90°F and 0 that feel at or below 32°F.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Stillwater 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 | 48° / 30° | 1.5 | 5.3 | 1.3 | 9.8 | 2.1 |
| Feb | 53° / 33° | 1.8 | 5.7 | 1.3 | 10.6 | 3.4 |
| Mar | 62° / 42° | 2.9 | 8.1 | 0.7 | 11.7 | 5.6 |
| Apr | 71° / 50° | 4.1 | 9 | 0 | 12.9 | 6.8 |
| May | 79° / 60° | 4.8 | 11.2 | 0 | 13.9 | 6.5 |
| Jun | 88° / 69° | 4.1 | 9.9 | 0 | 14.4 | 4.6 |
| Jul | 93° / 73° | 2.9 | 7.4 | 0 | 14.2 | 3.5 |
| Aug | 91° / 72° | 2.6 | 6.9 | 0 | 13.4 | 3.9 |
| Sep | 83° / 64° | 3.1 | 7.3 | 0 | 12.2 | 6.3 |
| Oct | 72° / 52° | 3.2 | 7.6 | 0.1 | 11.1 | 7.4 |
| Nov | 60° / 41° | 2.0 | 5.7 | 0.4 | 10.1 | 5.5 |
| Dec | 50° / 32° | 1.8 | 5.4 | 1.3 | 9.6 | 2.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 52% of the time across summer.
Chance of precipitation in Summer
Stillwater gets around 9.6 in of rain over 24 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 18 min in early June to 12 h 48 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 6.6 kWh/m².
Is summer a good time to visit Stillwater?
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 Stillwater for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Stillwater in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Stillwater sees daytime highs around 91°F and nights near 71°F. Pack light clothes and sun protection. Worth having: rain gear. About 24 days see rain.
UV index in Stillwater in Summer
Clear-sky midday UV across summer averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Stillwater peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 9 | 8 | 10 | 10 | 10 | 7 | 5 | 4 | 2 |
| Level | Moderate | Moderate | High | Very high | Very high | Very high | Very high | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | High |
| Apr | 9 | Very high |
| May | 8 | Very high |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Air quality in Stillwater in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Stillwater is worst in July — around 15 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (November, 5 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 8 | 12 | 13 | 11 | 12 | 15 | 13 | 9 | 5 | 5 | 5 |
| Level | Good | Good | Good | Moderate | Good | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 8 | Good |
| Mar | 12 | Good |
| Apr | 13 | Moderate |
| May | 11 | Good |
| Jun | 12 | Moderate |
| Jul | 15 | Moderate |
| Aug | 13 | Moderate |
| Sep | 9 | Good |
| Oct | 5 | Good |
| Nov | 5 | Good |
| Dec | 5 | Good |
Where is Stillwater?
Stillwater sits at 36.1°N, 97.1°W, 896 ft above sea level, in United States. The nearest listed city is Edmond, 40 mi away.
Topography around Stillwater
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Stillwater.
Within 2 miles, the terrain around Stillwater has only modest variations in elevation — a maximum elevation change of 138 ft around an average of 902 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 341 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 719 ft.
The land around Stillwater is covered by trees (35%), artificial surfaces (33%) and grassland (24%) within 2 miles, grassland (50%) and trees (39%) within 10 miles, and grassland (47%) and trees (32%) 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 Stillwater (36.1156°, -97.0584°, elevation 896 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.