Climate averages 1991–2020
Jember weather
in September.
A hot, moderately wet month: the joint 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Jember: daytime highs average 29.3°C and nights cool to about 21.3°C. By daytime temperature it is the joint 2nd warmest of the 12 months.
Expect about 57 mm of rain on roughly 10 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 03 min on an average September day.
The nearest other city in this atlas is Lumajang (52 km away). In September its highs average 29.0°C, about as warm as Jember, with 67 mm of rain.
Among the 200 cities listed in Indonesia, Jember ranks joint 140th of 200 for the warmest September highs and joint 75th of 200 for the driest September (rainfall, lowest first). The mean September high of those 200 cities is 30.1°C; Jember is 0.8°C cooler than that mean.
From September to October, average highs rise by 0.6°C to 29.8°C, and monthly rainfall rises from 57 mm to 119 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Jember climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.5°C22.7°C | 22.7°C | 358 | 29.3 | 12.513 h |
| February | 28.7°C22.7°C | 22.7°C | 337 | 27.4 | 12.412 h |
| March | 29.1°C22.7°C | 22.7°C | 322 | 27.8 | 12.212 h |
| April | 29.3°C22.7°C | 22.7°C | 214 | 24.3 | 11.912 h |
| May | 29.2°C22.1°C | 22.1°C | 108 | 15.5 | 11.712 h |
| June | 28.6°C21.4°C | 21.4°C | 64 | 10.7 | 11.712 h |
| July | 28.1°C20.7°C | 20.7°C | 38 | 7.5 | 11.712 h |
| August | 28.4°C20.5°C | 20.5°C | 25 | 6.2 | 11.812 h |
| September, selected | 29.3°C21.3°C | 21.3°C | 57 | 10.2 | 12.112 h |
| October | 29.8°C22.3°C | 22.3°C | 119 | 18.0 | 12.312 h |
| November | 29.1°C22.9°C | 22.9°C | 268 | 25.4 | 12.512 h |
| December | 28.4°C22.8°C | 22.8°C | 338 | 28.2 | 12.613 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Lumajang in SeptemberIndonesia · 52 kmHigh 29.0°C · Low 21.7°C · 67 mm rain
- Genteng in SeptemberIndonesia · 54 kmHigh 27.5°C · Low 19.9°C · 45 mm rain
- Situbondo in SeptemberIndonesia · 62 kmHigh 32.2°C · Low 23.1°C · 19 mm rain
- Probolinggo in SeptemberIndonesia · 71 kmHigh 30.5°C · Low 24.2°C · 12 mm rain
- Banyuwangi in SeptemberIndonesia · 73 kmHigh 29.3°C · Low 22.8°C · 45 mm rain
- Negara in SeptemberIndonesia · 103 kmHigh 28.6°C · Low 23.6°C · 14 mm rain
- Pasuruan in SeptemberIndonesia · 105 kmHigh 31.9°C · Low 22.8°C · 10 mm rain
- Pamekasan in SeptemberIndonesia · 116 kmHigh 30.4°C · Low 25.6°C · 13 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jember) is explained once on the Jember year overview and on the Sources, method and limits page.