Bireun in Fall
In fall (September, October and November), Bireun sees average daytime highs around 29°C and overnight lows near 25°C, with 837 mm of rain over about 79 wet days across the season. It is the 3rd-warmest season and the wettest season of the year.
Across fall, daytime highs hold fairly steady around 29°C. The sky is clear or mostly clear about 1% of the time across fall, and the air most often feels miserable.
Fall is Bireun's weakest season of the year to visit on our travel score. Bireun 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 Bireun's year-round climate.
- Avg daytime high
- 29°C
- 3rd-warmest season
- Avg overnight low
- 25°C
- Rainfall
- 837 mm
- 79 wet days
- Avg wind
- 5 km/h
- Travel score
- 3.1
- weakest season of the year
- Months
- Sep · Oct · Nov
Temperature in Bireun in Fall
Across fall, daytime highs hold fairly steady around 29°C.
A typical fall day in Bireun reaches about 29°C and drops to 25°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Bireun
Once humidity and wind are folded in, fall brings about 91 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Bireun weather by month
How the three fall months (September, October and November) 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° | 156 | 21.8 | 11.7 | 3.9 |
| Feb | 29° / 25° | 118 | 18.4 | 11.8 | 4.0 |
| Mar | 30° / 25° | 144 | 22.3 | 12 | 3.6 |
| Apr | 30° / 25° | 168 | 25.1 | 12.1 | 3.0 |
| May | 30° / 26° | 193 | 23.1 | 12.2 | 3.1 |
| Jun | 31° / 26° | 126 | 18 | 12.3 | 3.6 |
| Jul | 30° / 26° | 136 | 19.5 | 12.3 | 3.6 |
| Aug | 30° / 25° | 157 | 21.8 | 12.2 | 3.4 |
| Sep | 30° / 25° | 199 | 24.1 | 12 | 3.2 |
| Oct | 29° / 25° | 272 | 27.4 | 11.9 | 3.1 |
| Nov | 29° / 25° | 367 | 27.9 | 11.8 | 3.0 |
| Dec | 29° / 25° | 292 | 25.2 | 11.7 | 3.5 |
Cloud cover in Fall
The sky is clear or mostly clear about 1% of the time across fall.
Chance of precipitation in Fall
Bireun gets around 837 mm of rain over 79 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 5 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 06 min in early September to 11 h 42 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.6 kWh/m².
Hazard calendar for Bireun
In fall, Bireun overlaps its cyclone season. The full year is below, with each hazard's peak months called out.
Bireun sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Is fall a good time to visit Bireun?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Bireun.
What to pack for Bireun in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Bireun sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 79 days see rain.
Sea temperature near Bireun in Fall
The nearest coast averages about 29°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 21 km away) is warmest in May at about 30°C and coldest in January near 28°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 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Tropical |
UV index in Bireun in Fall
Clear-sky midday UV across fall 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 Bireun peaks around February 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 11 | 14 | 14 | 14 | 12 | 11 | 11 | 11 | 13 | 13 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 14 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 13 | Extreme |
| Oct | 13 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Extreme |
Air quality in Bireun in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Bireun is worst in September — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 16 | 19 | 18 | 18 | 19 | 18 | 18 | 19 | 17 | 14 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 16 | Moderate |
| Mar | 19 | Moderate |
| Apr | 18 | Moderate |
| May | 18 | Moderate |
| Jun | 19 | Moderate |
| Jul | 18 | Moderate |
| Aug | 18 | Moderate |
| Sep | 19 | Moderate |
| Oct | 17 | Moderate |
| Nov | 14 | Moderate |
| Dec | 13 | Moderate |
Where is Bireun?
Bireun sits at 5.2°N, 96.7°E, 19 m above sea level, in Indonesia. The nearest listed city is Reuleuet, 46 km away.
Topography around Bireun
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Bireun.
Within 3 km, the terrain around Bireun has only modest variations in elevation — a maximum elevation change of 158 m around an average of 20 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 372 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,846 m.
The land around Bireun is covered by trees (41%), cropland (31%) and artificial surfaces (24%) within 3 km, trees (49%) and water (39%) within 16 km, and trees (59%) and water (35%) within 80 km.
Indonesia travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,060
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 30%
- of population, 2024
- Homicide rate
- 0.3
- per 100k, 2022
- Road deaths
- 11.3
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 471
- 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 Bireun (5.203°, 96.7009°, elevation 19 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.