Batu weather in September
In September, Batu sees average daytime highs of 28°C and overnight lows near 18°C, with 57 mm of rain across 8.1 wet days and about 12 hours of daylight. It is the 2nd-warmest and 10th-wettest month of the year here.
Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 16% of the time in September, and the air most often feels humid.
Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Batu's 1st-clearest and 4th-windiest month. For the whole year in context, see Batu's year-round climate.
- Daytime high
- 28°
- 2nd warmest
- Overnight low
- 18°
- 3rd coldest
- Rainfall
- 57 mm
- 8.1 wet days
- Daylight
- 12 hours
- 5:25 AM – 5:23 PM
- Cloud cover
- 65%
- 1st clearest
- Wind
- 4 km/h
- 4th windiest
- Solar energy
- 6.16 kWh/m²
- Travel score
- 6.5
- out of 10
Batu is city in East Java Province, Indonesia.
- Density
- 1,114/km²
- people per km²
- Founded
- 2001
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 28°C through the month.
A typical September day in Batu reaches about 28°C in the afternoon and slips back to 18°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 27 | 17 |
| 2 | 27 | 17 |
| 3 | 27 | 18 |
| 4 | 27 | 18 |
| 5 | 27 | 18 |
| 6 | 27 | 18 |
| 7 | 27 | 18 |
| 8 | 27 | 18 |
| 9 | 27 | 18 |
| 10 | 27 | 18 |
| 11 | 28 | 18 |
| 12 | 28 | 18 |
| 13 | 28 | 18 |
| 14 | 28 | 18 |
| 15 | 28 | 18 |
| 16 | 28 | 18 |
| 17 | 28 | 18 |
| 18 | 28 | 18 |
| 19 | 28 | 18 |
| 20 | 28 | 18 |
| 21 | 28 | 18 |
| 22 | 28 | 18 |
| 23 | 28 | 18 |
| 24 | 28 | 18 |
| 25 | 28 | 18 |
| 26 | 28 | 18 |
| 27 | 28 | 18 |
| 28 | 28 | 18 |
| 29 | 28 | 18 |
| 30 | 28 | 18 |
Batu weather by month
How September compares with the rest of the year at a glance. September is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 27° / 20° | 510 | 29.7 | 12.4 | 3.4 |
| Feb | 26° / 20° | 493 | 27.6 | 12.3 | 3.3 |
| Mar | 27° / 20° | 464 | 28.9 | 12.1 | 3.5 |
| Apr | 27° / 20° | 295 | 25.5 | 11.8 | 3.9 |
| May | 27° / 19° | 138 | 18.5 | 11.6 | 5.1 |
| Jun | 27° / 18° | 72 | 12.8 | 11.6 | 6.0 |
| Jul | 26° / 17° | 51 | 9.8 | 11.6 | 6.5 |
| Aug | 27° / 17° | 37 | 7.4 | 11.7 | 6.7 |
| Sep | 28° / 18° | 57 | 8.1 | 12 | 6.5 |
| Oct | 28° / 19° | 152 | 15.4 | 12.2 | 5.4 |
| Nov | 27° / 20° | 326 | 23.3 | 12.4 | 4.1 |
| Dec | 27° / 20° | 436 | 28.4 | 12.4 | 3.6 |
Cloud cover in September
The sky is clear or mostly clear about 16% of the time in September, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 20% of September, with mostly cloudy or overcast conditions the remaining 63%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 36 | 37 | 37 | 37 | 38 | 39 | 39 | 39 | 39 | 39 | 38 | 38 | 38 | 39 | 39 | 38 | 38 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 35 | 34 | 33 | 33 | 32 | 31 |
| Cloudier (%) | 64 | 63 | 63 | 63 | 62 | 61 | 61 | 61 | 61 | 61 | 62 | 62 | 62 | 61 | 61 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 66 | 67 | 67 | 68 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 36 | 64 |
| 2 | 37 | 63 |
| 3 | 37 | 63 |
| 4 | 37 | 63 |
| 5 | 38 | 62 |
| 6 | 39 | 61 |
| 7 | 39 | 61 |
| 8 | 39 | 61 |
| 9 | 39 | 61 |
| 10 | 39 | 61 |
| 11 | 38 | 62 |
| 12 | 38 | 62 |
| 13 | 38 | 62 |
| 14 | 39 | 61 |
| 15 | 39 | 61 |
| 16 | 38 | 62 |
| 17 | 38 | 62 |
| 18 | 37 | 63 |
| 19 | 37 | 63 |
| 20 | 37 | 63 |
| 21 | 36 | 64 |
| 22 | 36 | 64 |
| 23 | 36 | 64 |
| 24 | 35 | 65 |
| 25 | 35 | 65 |
| 26 | 34 | 66 |
| 27 | 33 | 67 |
| 28 | 33 | 67 |
| 29 | 32 | 68 |
| 30 | 31 | 69 |
Chance of precipitation in September
Batu gets around 57 mm of rain over 8.1 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 28% and peaks near 39% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 25 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 |
| Rain chance (%) | |
|---|---|
| 1 | 25 |
| 2 | 25 |
| 3 | 24 |
| 4 | 24 |
| 5 | 24 |
| 6 | 23 |
| 7 | 23 |
| 8 | 23 |
| 9 | 23 |
| 10 | 23 |
| 11 | 23 |
| 12 | 23 |
| 13 | 24 |
| 14 | 24 |
| 15 | 25 |
| 16 | 25 |
| 17 | 26 |
| 18 | 27 |
| 19 | 28 |
| 20 | 29 |
| 21 | 30 |
| 22 | 31 |
| 23 | 32 |
| 24 | 33 |
| 25 | 34 |
| 26 | 35 |
| 27 | 36 |
| 28 | 37 |
| 29 | 38 |
| 30 | 39 |
Humidity in September
Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the humid band about 48% of days. Sticky, muggy-or-worse air turns up on roughly 29% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Comfortable (%) | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 22 | 21 | 21 | 20 | 20 | 20 | 19 | 19 | 19 | 18 | 18 | 17 |
| Humid (%) | 50 | 50 | 50 | 50 | 51 | 50 | 50 | 50 | 51 | 51 | 50 | 50 | 50 | 50 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 47 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 |
| Muggy (%) | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 23 | 23 | 24 | 24 | 24 | 25 | 26 | 26 | 27 | 28 | 28 | 29 | 30 | 31 | 32 | 33 | 35 | 36 | 37 | 38 | 39 | 41 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 1 | 24 | 50 | 25 | 0 |
| 2 | 1 | 24 | 50 | 25 | 0 |
| 3 | 1 | 24 | 50 | 25 | 0 |
| 4 | 1 | 24 | 50 | 25 | 0 |
| 5 | 1 | 24 | 51 | 24 | 0 |
| 6 | 1 | 25 | 50 | 24 | 0 |
| 7 | 1 | 25 | 50 | 24 | 0 |
| 8 | 1 | 25 | 50 | 24 | 0 |
| 9 | 1 | 25 | 51 | 23 | 0 |
| 10 | 1 | 25 | 51 | 23 | 0 |
| 11 | 1 | 25 | 50 | 24 | 0 |
| 12 | 1 | 25 | 50 | 24 | 0 |
| 13 | 1 | 25 | 50 | 24 | 0 |
| 14 | 1 | 24 | 50 | 25 | 0 |
| 15 | 1 | 24 | 49 | 26 | 0 |
| 16 | 1 | 24 | 49 | 26 | 0 |
| 17 | 1 | 23 | 49 | 27 | 0 |
| 18 | 1 | 23 | 49 | 28 | 0 |
| 19 | 1 | 22 | 48 | 28 | 0 |
| 20 | 1 | 21 | 48 | 29 | 0 |
| 21 | 1 | 21 | 48 | 30 | 0 |
| 22 | 1 | 20 | 47 | 31 | 0 |
| 23 | 1 | 20 | 47 | 32 | 0 |
| 24 | 1 | 20 | 46 | 33 | 0 |
| 25 | 1 | 19 | 45 | 35 | 0 |
| 26 | 1 | 19 | 44 | 36 | 0 |
| 27 | 1 | 19 | 43 | 37 | 0 |
| 28 | 1 | 18 | 42 | 38 | 0 |
| 29 | 1 | 18 | 41 | 39 | 1 |
| 30 | 1 | 17 | 40 | 41 | 1 |
Wind in September
Winds average 4 km/h in September.
Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over September. Sunrise moves from 5:34 AM to 5:17 AM, and sunset from 5:25 PM to 5:21 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 |
| Sunrise (AM) | 5:34 | 5:34 | 5:33 | 5:32 | 5:32 | 5:31 | 5:31 | 5:30 | 5:30 | 5:29 | 5:28 | 5:28 | 5:27 | 5:27 | 5:26 | 5:25 | 5:25 | 5:24 | 5:24 | 5:23 | 5:23 | 5:22 | 5:21 | 5:21 | 5:20 | 5:20 | 5:19 | 5:18 | 5:18 | 5:17 |
| Sunset (PM) | 5:25 | 5:25 | 5:25 | 5:25 | 5:25 | 5:24 | 5:24 | 5:24 | 5:24 | 5:24 | 5:24 | 5:24 | 5:23 | 5:23 | 5:23 | 5:23 | 5:23 | 5:23 | 5:22 | 5:22 | 5:22 | 5:22 | 5:22 | 5:22 | 5:22 | 5:22 | 5:21 | 5:21 | 5:21 | 5:21 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 5:34 | 5:25 |
| 2 | 11.9 | 5:34 | 5:25 |
| 3 | 11.9 | 5:33 | 5:25 |
| 4 | 11.9 | 5:32 | 5:25 |
| 5 | 11.9 | 5:32 | 5:25 |
| 6 | 11.9 | 5:31 | 5:24 |
| 7 | 11.9 | 5:31 | 5:24 |
| 8 | 11.9 | 5:30 | 5:24 |
| 9 | 11.9 | 5:30 | 5:24 |
| 10 | 11.9 | 5:29 | 5:24 |
| 11 | 11.9 | 5:28 | 5:24 |
| 12 | 11.9 | 5:28 | 5:24 |
| 13 | 11.9 | 5:27 | 5:23 |
| 14 | 11.9 | 5:27 | 5:23 |
| 15 | 11.9 | 5:26 | 5:23 |
| 16 | 12.0 | 5:25 | 5:23 |
| 17 | 12.0 | 5:25 | 5:23 |
| 18 | 12.0 | 5:24 | 5:23 |
| 19 | 12.0 | 5:24 | 5:22 |
| 20 | 12.0 | 5:23 | 5:22 |
| 21 | 12.0 | 5:23 | 5:22 |
| 22 | 12.0 | 5:22 | 5:22 |
| 23 | 12.0 | 5:21 | 5:22 |
| 24 | 12.0 | 5:21 | 5:22 |
| 25 | 12.0 | 5:20 | 5:22 |
| 26 | 12.0 | 5:20 | 5:22 |
| 27 | 12.0 | 5:19 | 5:21 |
| 28 | 12.0 | 5:18 | 5:21 |
| 29 | 12.1 | 5:18 | 5:21 |
| 30 | 12.1 | 5:17 | 5:21 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.16 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 4.39 kWh/m² to a high of 6.16 kWh/m² in September across the year — September's 6.16 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 | 6.2 |
| Level | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.0 | Bright |
| 2 | 6.0 | Bright |
| 3 | 6.0 | Bright |
| 4 | 6.0 | Intense |
| 5 | 6.0 | Intense |
| 6 | 6.0 | Intense |
| 7 | 6.1 | Intense |
| 8 | 6.1 | Intense |
| 9 | 6.1 | Intense |
| 10 | 6.1 | Intense |
| 11 | 6.1 | Intense |
| 12 | 6.2 | Intense |
| 13 | 6.2 | Intense |
| 14 | 6.2 | Intense |
| 15 | 6.2 | Intense |
| 16 | 6.2 | Intense |
| 17 | 6.2 | Intense |
| 18 | 6.2 | Intense |
| 19 | 6.2 | Intense |
| 20 | 6.2 | Intense |
| 21 | 6.2 | Intense |
| 22 | 6.2 | Intense |
| 23 | 6.2 | Intense |
| 24 | 6.2 | Intense |
| 25 | 6.2 | Intense |
| 26 | 6.2 | Intense |
| 27 | 6.2 | Intense |
| 28 | 6.2 | Intense |
| 29 | 6.2 | Intense |
| 30 | 6.2 | Intense |
Hazard calendar for Batu
None of Batu's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Batu sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Batu's monsoon runs November–April, when most of the year's rain falls.
Is September a good time to visit Batu?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Batu for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Batu in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Batu sees daytime highs around 28°C and nights near 18°C. Pack light clothes and sun protection. Worth having: rain gear. About 8 days see rain.
Sea temperature near Batu in September
The nearest coast averages about 28°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 47 km away) is warmest in November at about 30°C and coldest in August 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) | 29 | 29 | 29 | 30 | 30 | 29 | 28 | 28 | 28 | 29 | 30 | 30 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 30 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Tropical |
| Oct | 29 | Tropical |
| Nov | 30 | Tropical |
| Dec | 30 | Tropical |
UV index in Batu in September
Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Batu peaks around March 17 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 16 at about 8 (very high).
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) | 14 | 13 | 15 | 13 | 10 | 8 | 10 | 12 | 13 | 13 | 10 | 12 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 13 | Extreme |
| Mar | 15 | Extreme |
| Apr | 13 | Extreme |
| May | 10 | Extreme |
| Jun | 8 | Very high |
| Jul | 10 | Very high |
| Aug | 12 | Extreme |
| Sep | 13 | Extreme |
| Oct | 13 | Extreme |
| Nov | 10 | Extreme |
| Dec | 12 | Extreme |
Air quality in Batu in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Batu is worst in May — around 101 µg/m³ PM2.5 (unhealthy), 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) | 76 | 71 | 87 | 99 | 101 | 95 | 81 | 66 | 69 | 80 | 87 | 81 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 76 | Unhealthy |
| Feb | 71 | Unhealthy |
| Mar | 87 | Unhealthy |
| Apr | 99 | Unhealthy |
| May | 101 | Unhealthy |
| Jun | 95 | Unhealthy |
| Jul | 81 | Unhealthy |
| Aug | 66 | Unhealthy |
| Sep | 69 | Unhealthy |
| Oct | 80 | Unhealthy |
| Nov | 87 | Unhealthy |
| Dec | 81 | Unhealthy |
Where is Batu?
Batu sits at 7.9°S, 112.5°E, 881 m above sea level, in Indonesia. The nearest listed city is Singosari, 15 km away.
Topography around Batu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Batu.
Within 3 km, the terrain around Batu has significant variations in elevation — a maximum elevation change of 588 m around an average of 915 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,889 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,645 m.
The land around Batu is covered by trees (45%) and artificial surfaces (40%) within 3 km, trees (75%) within 16 km, and trees (49%) and cropland (21%) 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 Batu (-7.87°, 112.5283°, elevation 881 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).