Gwynn Oak in Summer
In summer (June, July and August), Gwynn Oak sees average daytime highs around 84°F and overnight lows near 68°F, with 11.7 in of rain over about 35 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 79°F in early June to 83°F by late August. The sky is clear or mostly clear about 28% of the time across summer, and the air most often feels muggy.
Summer is Gwynn Oak's 2nd-best season to visit on our travel score. For the whole year in context, see Gwynn Oak's year-round climate.
- Avg daytime high
- 84°F
- warmest season of the year
- Avg overnight low
- 68°F
- Rainfall
- 11.7 in
- 35 wet days
- Avg wind
- 6 mph
- Travel score
- 5.3
- 2nd-best season
- Months
- Jun · Jul · Aug
Temperature in Gwynn Oak in Summer
Over the season highs climb from about 79°F in early June to 83°F by late August.
A typical summer day in Gwynn Oak reaches about 84°F and drops to 68°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Gwynn Oak
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.
Gwynn Oak 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 | 42° / 28° | 3.1 | 8.5 | 3 | 9.5 | 0.2 |
| Feb | 44° / 29° | 2.9 | 8.5 | 3.2 | 10.5 | 0.9 |
| Mar | 53° / 36° | 4.0 | 10.3 | 2.2 | 11.7 | 3.0 |
| Apr | 64° / 47° | 3.5 | 10.3 | 0.2 | 13 | 5.7 |
| May | 73° / 56° | 3.8 | 11.4 | 0 | 14.1 | 6.5 |
| Jun | 82° / 65° | 3.7 | 11.6 | 0 | 14.7 | 5.8 |
| Jul | 86° / 70° | 4.2 | 12.1 | 0 | 14.5 | 4.7 |
| Aug | 84° / 69° | 3.7 | 10.9 | 0 | 13.5 | 5.4 |
| Sep | 78° / 61° | 4.6 | 9.1 | 0 | 12.3 | 6.9 |
| Oct | 66° / 50° | 3.6 | 8 | 0 | 11 | 6.4 |
| Nov | 55° / 39° | 3.0 | 7.6 | 0.2 | 9.8 | 3.8 |
| Dec | 46° / 32° | 3.7 | 9 | 1.7 | 9.3 | 1.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 28% of the time across summer.
Chance of precipitation in Summer
Gwynn Oak gets around 11.7 in of rain over 35 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 6 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 36 min in early June to 12 h 54 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 5.8 kWh/m².
Hazard calendar for Gwynn Oak
In summer, Gwynn Oak overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Gwynn Oak sits in the Atlantic hurricane belt; the season peaks August–October.
Is summer a good time to visit Gwynn Oak?
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 Gwynn Oak for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Gwynn Oak in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Gwynn Oak sees daytime highs around 84°F and nights near 68°F. Pack light clothes and sun protection. Worth having: rain gear. About 35 days see rain.
Sea temperature near Gwynn Oak in Summer
The nearest coast averages about 74°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 22 mi away) is warmest in August at about 78°F and coldest in February near 36°F.
It's comfortable for a long swim from Jun 16 to Oct 5 — about 3.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 36 | 40 | 47 | 58 | 68 | 76 | 78 | 74 | 65 | 53 | 44 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Warm | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 36 | Bracing |
| Mar | 40 | Bracing |
| Apr | 47 | Bracing |
| May | 58 | Bracing |
| Jun | 68 | Refreshing |
| Jul | 76 | Warm |
| Aug | 78 | Warm |
| Sep | 74 | Refreshing |
| Oct | 65 | Cool |
| Nov | 53 | Bracing |
| Dec | 44 | Bracing |
UV index in Gwynn Oak in Summer
Clear-sky midday UV across summer averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Gwynn Oak peaks around July 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Gwynn Oak 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 Gwynn Oak is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 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) | 10 | 12 | 13 | 13 | 15 | 16 | 17 | 14 | 12 | 9 | 8 | 10 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 12 | Good |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 12 | Good |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 10 | Good |
Where is Gwynn Oak?
Gwynn Oak sits at 39.3°N, 76.7°W, 427 ft above sea level, in United States. The nearest listed city is Lochearn, 1.9 mi away.
Topography around Gwynn Oak
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gwynn Oak.
Within 2 miles, the terrain around Gwynn Oak has only modest variations in elevation — a maximum elevation change of 348 ft around an average of 397 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 925 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,031 ft.
The land around Gwynn Oak is covered by trees (50%) and artificial surfaces (39%) within 2 miles, trees (58%) and artificial surfaces (27%) within 10 miles, and trees (52%) 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 Gwynn Oak (39.3326°, -76.6928°, elevation 427 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.