Seria in Summer
In summer (June, July and August), Seria sees average daytime highs around 30°C and overnight lows near 25°C, with 585 mm of rain over about 64 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 6% of the time across summer, and the air most often feels miserable.
Summer is Seria's best season of the year to visit on our travel score. Seria has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Seria's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 585 mm
- 64 wet days
- Avg wind
- 8 km/h
- Travel score
- 3.5
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Seria in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Seria reaches about 30°C and drops to 25°C overnight. The warmest of the three months is June, the coolest July.
How summer really feels in Seria
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Seria 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 (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 25° | 227 | 24.5 | 11.8 | 3.5 |
| Feb | 29° / 25° | 151 | 20.1 | 11.8 | 3.8 |
| Mar | 29° / 25° | 134 | 23 | 12 | 3.6 |
| Apr | 30° / 25° | 176 | 25 | 12.1 | 3.1 |
| May | 30° / 25° | 189 | 23.4 | 12.2 | 3.2 |
| Jun | 30° / 25° | 206 | 21.1 | 12.3 | 3.5 |
| Jul | 30° / 25° | 187 | 20.8 | 12.2 | 3.6 |
| Aug | 30° / 25° | 192 | 21.7 | 12.2 | 3.5 |
| Sep | 30° / 25° | 199 | 23.6 | 12 | 3.2 |
| Oct | 29° / 25° | 269 | 27.8 | 11.9 | 3.0 |
| Nov | 29° / 25° | 284 | 28.5 | 11.8 | 2.8 |
| Dec | 29° / 25° | 287 | 28.1 | 11.7 | 3.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 6% of the time across summer.
Chance of precipitation in Summer
Seria gets around 585 mm of rain over 64 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 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 12 min in early June to 12 h 06 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 5.4 kWh/m².
Hazard calendar for Seria
In summer, Seria overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Seria sits in the Pacific typhoon belt; the season peaks July–October.
Is summer a good time to visit Seria?
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 Seria.
What to pack for Seria in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Seria sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 64 days see rain.
Sea temperature near Seria in Summer
The nearest coast averages about 30°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in May at about 30°C and coldest in February near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 28 | 27 | 28 | 29 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 |
| Comfort | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 27 | Warm |
| Mar | 28 | Warm |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in Seria in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Seria peaks around February 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 10 (extreme).
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) | 13 | 14 | 14 | 14 | 13 | 12 | 11 | 13 | 12 | 13 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 12 | Extreme |
| Jul | 11 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Extreme |
Air quality in Seria 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 Seria is worst in May — around 68 µg/m³ PM2.5 (unhealthy), about 5.1× the cleanest month (October, 13 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) | 17 | 48 | 47 | 34 | 68 | 35 | 23 | 23 | 28 | 13 | 24 | 24 |
| Level | Moderate | Poor | Poor | Moderate | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 17 | Moderate |
| Feb | 48 | Poor |
| Mar | 47 | Poor |
| Apr | 34 | Moderate |
| May | 68 | Unhealthy |
| Jun | 35 | Moderate |
| Jul | 23 | Moderate |
| Aug | 23 | Moderate |
| Sep | 28 | Moderate |
| Oct | 13 | Moderate |
| Nov | 24 | Moderate |
| Dec | 24 | Moderate |
Where is Seria?
Seria sits at 4.6°N, 114.3°E, 6 m above sea level, in Brunei. The nearest listed city is Kuala Belait, 11 km away.
Topography around Seria
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Seria.
Within 3 km, the terrain around Seria has only modest variations in elevation — a maximum elevation change of 45 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 78 m; within 80 km, large variations in elevation — a maximum elevation change of 630 m.
The land around Seria is covered by trees (37%), water (25%) and grassland (24%) within 3 km, trees (49%) and water (44%) within 16 km, and trees (59%) and water (38%) within 80 km.
Brunei travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type G
- 240 V · 50 Hz
- Prices
- ≈ 35% of US
- price level, 2025
- GDP per capita
- $32,235
- 2025
- Homicide rate
- 0.5
- per 100k, 2013
- Road deaths
- 7.5
- 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 Seria (4.6064°, 114.3248°, elevation 6 m), 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.