Port Arthur in Summer
In summer (June, July and August), Port Arthur sees average daytime highs around 88°F and overnight lows near 76°F, with 14.3 in of rain over about 47 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 88°F. The sky is clear or mostly clear about 36% of the time across summer, and the air most often feels miserable.
Summer is Port Arthur's weakest season of the year to visit on our travel score. For the whole year in context, see Port Arthur's year-round climate.
- Avg daytime high
- 88°F
- warmest season of the year
- Avg overnight low
- 76°F
- Rainfall
- 14.3 in
- 47 wet days
- Avg wind
- 6 mph
- Travel score
- 3.8
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Port Arthur in Summer
Across summer, daytime highs hold fairly steady around 88°F.
A typical summer day in Port Arthur reaches about 88°F and drops to 76°F overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Port Arthur
Once humidity and wind are folded in, summer brings about 92 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.
Port Arthur 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 | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 61° / 46° | 4.7 | 9.8 | 10.3 | 5.1 |
| Feb | 64° / 49° | 3.4 | 8.7 | 10.9 | 5.9 |
| Mar | 70° / 56° | 3.9 | 9.5 | 11.8 | 6.6 |
| Apr | 76° / 62° | 4.4 | 9.4 | 12.7 | 7.0 |
| May | 83° / 69° | 3.8 | 10.7 | 13.5 | 6.0 |
| Jun | 87° / 75° | 5.2 | 15.1 | 13.9 | 4.2 |
| Jul | 89° / 77° | 4.2 | 15.9 | 13.7 | 3.6 |
| Aug | 89° / 76° | 4.8 | 15.7 | 13.1 | 3.6 |
| Sep | 86° / 72° | 5.4 | 12.3 | 12.2 | 4.8 |
| Oct | 79° / 63° | 4.1 | 8.8 | 11.3 | 7.1 |
| Nov | 70° / 53° | 4.3 | 8.6 | 10.5 | 6.8 |
| Dec | 63° / 48° | 4.7 | 9.5 | 10.1 | 5.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 36% of the time across summer.
Chance of precipitation in Summer
Port Arthur gets around 14.3 in of rain over 47 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — 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 13 h 48 min in early June to 12 h 42 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 6.1 kWh/m².
Hazard calendar for Port Arthur
In summer, Port Arthur overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Port Arthur sits in the Atlantic hurricane belt; the season peaks August–October.
Is summer a good time to visit Port Arthur?
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 weaker month for outdoor sightseeing in Port Arthur.
What to pack for Port Arthur in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Port Arthur sees daytime highs around 88°F and nights near 76°F. Pack light clothes, rain gear and sun protection. About 47 days see rain.
Sea temperature near Port Arthur in Summer
The nearest coast averages about 85°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 19 mi away) is warmest in August at about 86°F and coldest in January near 58°F.
It's comfortable for a long swim from Apr 3 to Nov 19 — about 7.6 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 58 | 59 | 64 | 71 | 78 | 84 | 86 | 86 | 84 | 77 | 69 | 62 |
| Comfort | Bracing | Cool | Cool | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Refreshing | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 58 | Bracing |
| Feb | 59 | Cool |
| Mar | 64 | Cool |
| Apr | 71 | Refreshing |
| May | 78 | Warm |
| Jun | 84 | Tropical |
| Jul | 86 | Tropical |
| Aug | 86 | Tropical |
| Sep | 84 | Tropical |
| Oct | 77 | Warm |
| Nov | 69 | Refreshing |
| Dec | 62 | Cool |
UV index in Port Arthur 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 Port Arthur peaks around July 14 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 7 | 10 | 10 | 10 | 10 | 10 | 8 | 6 | 5 | 4 |
| Level | Moderate | High | High | Very high | Extreme | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 7 | High |
| Apr | 10 | Very high |
| May | 10 | Extreme |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 4 | Moderate |
Air quality in Port Arthur 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 Port Arthur is worst in July — around 22 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (December, 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 | 11 | 12 | 11 | 13 | 18 | 22 | 17 | 14 | 11 | 9 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 11 | Good |
| Mar | 12 | Good |
| Apr | 11 | Good |
| May | 13 | Moderate |
| Jun | 18 | Moderate |
| Jul | 22 | Moderate |
| Aug | 17 | Moderate |
| Sep | 14 | Moderate |
| Oct | 11 | Good |
| Nov | 9 | Good |
| Dec | 8 | Good |
Where is Port Arthur?
Port Arthur sits at 29.9°N, 93.9°W, 7 ft above sea level, in United States. The nearest listed city is Groves, 4.3 mi away.
Topography around Port Arthur
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Port Arthur.
Within 2 miles, the terrain around Port Arthur has only modest variations in elevation — a maximum elevation change of 56 ft around an average of 7 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 75 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 190 ft.
The land around Port Arthur is covered by artificial surfaces (28%), grassland (24%) and trees (22%) within 2 miles, water (36%) and wetland (30%) within 10 miles, and trees (35%) and water (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 Port Arthur (29.8852°, -93.9423°, elevation 7 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.