Lasem weather in September
In September, Lasem sees average daytime highs of 31°C and overnight lows near 25°C, with 25 mm of rain across 4.5 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 44% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 11 h 54 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Lasem's 2nd-clearest and 5th-windiest month. For the whole year in context, see Lasem's year-round climate.
- Daytime high
- 31°
- 2nd warmest
- Overnight low
- 25°
- 3rd coldest
- Rainfall
- 25 mm
- 4.5 wet days
- Daylight
- 12 hours
- 5:30 AM – 5:27 PM
- Cloud cover
- 49%
- 2nd clearest
- Wind
- 11 km/h
- 5th windiest
- Solar energy
- 6.76 kWh/m²
- Travel score
- 5.4
- out of 10
Temperature in September
Day-to-day highs hold fairly steady near 31°C through the month.
A typical September day in Lasem reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 31°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) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 30 | 25 |
| 2 | 30 | 25 |
| 3 | 30 | 25 |
| 4 | 30 | 25 |
| 5 | 30 | 25 |
| 6 | 30 | 25 |
| 7 | 30 | 25 |
| 8 | 30 | 25 |
| 9 | 30 | 25 |
| 10 | 30 | 25 |
| 11 | 30 | 25 |
| 12 | 30 | 25 |
| 13 | 31 | 25 |
| 14 | 31 | 25 |
| 15 | 31 | 25 |
| 16 | 31 | 25 |
| 17 | 31 | 25 |
| 18 | 31 | 25 |
| 19 | 31 | 25 |
| 20 | 31 | 25 |
| 21 | 31 | 25 |
| 22 | 31 | 25 |
| 23 | 31 | 25 |
| 24 | 31 | 25 |
| 25 | 31 | 25 |
| 26 | 31 | 25 |
| 27 | 31 | 25 |
| 28 | 31 | 25 |
| 29 | 31 | 25 |
| 30 | 31 | 25 |
How September really feels in Lasem
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Lasem weather by month
How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 25° | 284 | 28.9 | 12.3 | 2.9 |
| Feb | 29° / 25° | 249 | 26.4 | 12.2 | 2.9 |
| Mar | 29° / 25° | 231 | 28.1 | 12 | 3.0 |
| Apr | 30° / 26° | 192 | 24.5 | 11.9 | 3.3 |
| May | 30° / 26° | 100 | 16.8 | 11.7 | 4.3 |
| Jun | 30° / 25° | 64 | 10.7 | 11.6 | 5.0 |
| Jul | 30° / 25° | 35 | 5.8 | 11.7 | 5.7 |
| Aug | 30° / 24° | 13 | 3.4 | 11.8 | 5.9 |
| Sep | 31° / 25° | 25 | 4.5 | 12 | 5.4 |
| Oct | 31° / 25° | 87 | 13.2 | 12.1 | 4.3 |
| Nov | 30° / 25° | 189 | 23.4 | 12.3 | 3.2 |
| Dec | 30° / 25° | 281 | 28.3 | 12.4 | 2.9 |
Cloud cover in September
The sky is clear or mostly clear about 44% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 38%. Skies tend to cloud over as the month goes on.
| 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 (%) | 69 | 69 | 69 | 68 | 68 | 68 | 67 | 67 | 67 | 67 | 66 | 65 | 64 | 64 | 63 | 62 | 62 | 61 | 60 | 59 | 59 | 57 | 56 | 56 | 55 | 55 | 54 | 54 | 53 | 53 |
| Cloudier (%) | 31 | 31 | 31 | 32 | 32 | 32 | 33 | 33 | 33 | 33 | 34 | 35 | 36 | 36 | 37 | 38 | 38 | 39 | 40 | 41 | 41 | 43 | 44 | 44 | 45 | 45 | 46 | 46 | 47 | 47 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 69 | 31 |
| 2 | 69 | 31 |
| 3 | 69 | 31 |
| 4 | 68 | 32 |
| 5 | 68 | 32 |
| 6 | 68 | 32 |
| 7 | 67 | 33 |
| 8 | 67 | 33 |
| 9 | 67 | 33 |
| 10 | 67 | 33 |
| 11 | 66 | 34 |
| 12 | 65 | 35 |
| 13 | 64 | 36 |
| 14 | 64 | 36 |
| 15 | 63 | 37 |
| 16 | 62 | 38 |
| 17 | 62 | 38 |
| 18 | 61 | 39 |
| 19 | 60 | 40 |
| 20 | 59 | 41 |
| 21 | 59 | 41 |
| 22 | 57 | 43 |
| 23 | 56 | 44 |
| 24 | 56 | 44 |
| 25 | 55 | 45 |
| 26 | 55 | 45 |
| 27 | 54 | 46 |
| 28 | 54 | 46 |
| 29 | 53 | 47 |
| 30 | 53 | 47 |
Chance of precipitation in September
Lasem gets around 25 mm of rain over 4.5 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 16% and peaks near 26% 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 (%) | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 14 | 14 | 15 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| Rain chance (%) | |
|---|---|
| 1 | 13 |
| 2 | 13 |
| 3 | 13 |
| 4 | 12 |
| 5 | 12 |
| 6 | 12 |
| 7 | 12 |
| 8 | 12 |
| 9 | 12 |
| 10 | 12 |
| 11 | 12 |
| 12 | 13 |
| 13 | 13 |
| 14 | 13 |
| 15 | 13 |
| 16 | 14 |
| 17 | 14 |
| 18 | 15 |
| 19 | 15 |
| 20 | 16 |
| 21 | 17 |
| 22 | 18 |
| 23 | 19 |
| 24 | 20 |
| 25 | 21 |
| 26 | 22 |
| 27 | 23 |
| 28 | 24 |
| 29 | 25 |
| 30 | 26 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 66% of days. Sticky, muggy-or-worse air turns up on roughly 99% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 28 | 27 | 26 | 25 | 25 | 24 | 23 | 23 | 22 | 21 | 21 | 20 |
| Oppressive (%) | 62 | 62 | 62 | 62 | 62 | 62 | 63 | 64 | 64 | 63 | 64 | 64 | 64 | 66 | 65 | 66 | 65 | 66 | 66 | 67 | 67 | 68 | 67 | 68 | 69 | 70 | 70 | 71 | 71 | 72 |
| Miserable (%) | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 2 | 34 | 62 | 2 |
| 2 | 2 | 34 | 62 | 2 |
| 3 | 2 | 34 | 62 | 2 |
| 4 | 2 | 34 | 62 | 2 |
| 5 | 2 | 34 | 62 | 2 |
| 6 | 2 | 34 | 62 | 2 |
| 7 | 2 | 34 | 63 | 1 |
| 8 | 2 | 33 | 64 | 1 |
| 9 | 2 | 33 | 64 | 1 |
| 10 | 2 | 33 | 63 | 2 |
| 11 | 2 | 32 | 64 | 2 |
| 12 | 2 | 32 | 64 | 2 |
| 13 | 2 | 32 | 64 | 2 |
| 14 | 1 | 31 | 66 | 2 |
| 15 | 1 | 31 | 65 | 3 |
| 16 | 1 | 30 | 66 | 3 |
| 17 | 1 | 30 | 65 | 4 |
| 18 | 1 | 29 | 66 | 4 |
| 19 | 1 | 28 | 66 | 5 |
| 20 | 1 | 27 | 67 | 5 |
| 21 | 1 | 26 | 67 | 6 |
| 22 | 1 | 25 | 68 | 6 |
| 23 | 1 | 25 | 67 | 7 |
| 24 | 1 | 24 | 68 | 7 |
| 25 | 1 | 23 | 69 | 7 |
| 26 | 0 | 23 | 70 | 7 |
| 27 | 0 | 22 | 70 | 8 |
| 28 | 0 | 21 | 71 | 8 |
| 29 | 0 | 21 | 71 | 8 |
| 30 | 0 | 20 | 72 | 8 |
Wind in September
Winds average 11 km/h in September.
Across September, daily wind ranges from about 11 km/h on the calmest days to 12 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) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | light breeze | 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 | 12 | light breeze |
| 2 | 12 | calm |
| 3 | 12 | calm |
| 4 | 12 | calm |
| 5 | 12 | calm |
| 6 | 12 | calm |
| 7 | 12 | calm |
| 8 | 12 | calm |
| 9 | 12 | calm |
| 10 | 12 | calm |
| 11 | 12 | calm |
| 12 | 12 | calm |
| 13 | 12 | calm |
| 14 | 12 | calm |
| 15 | 12 | calm |
| 16 | 12 | calm |
| 17 | 12 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 54 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 12 minutes over September. Sunrise moves from 5:38 AM to 5:22 AM, and sunset from 5:30 PM to 5:25 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) | 11.9 | 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 | 12.0 | 12.0 | 12.0 | 12.1 |
| Sunrise (AM) | 5:38 | 5:37 | 5:37 | 5:36 | 5:36 | 5:35 | 5:35 | 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 | 5:26 | 5:25 | 5:25 | 5:24 | 5:24 | 5:23 | 5:22 | 5:22 |
| Sunset (PM) | 5:30 | 5:30 | 5:30 | 5:30 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:28 | 5:28 | 5:28 | 5:28 | 5:28 | 5:27 | 5:27 | 5:27 | 5:27 | 5:27 | 5:27 | 5:26 | 5:26 | 5:26 | 5:26 | 5:26 | 5:26 | 5:25 | 5:25 | 5:25 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.9 | 5:38 | 5:30 |
| 2 | 11.9 | 5:37 | 5:30 |
| 3 | 11.9 | 5:37 | 5:30 |
| 4 | 11.9 | 5:36 | 5:30 |
| 5 | 11.9 | 5:36 | 5:29 |
| 6 | 11.9 | 5:35 | 5:29 |
| 7 | 11.9 | 5:35 | 5:29 |
| 8 | 11.9 | 5:34 | 5:29 |
| 9 | 11.9 | 5:34 | 5:29 |
| 10 | 11.9 | 5:33 | 5:29 |
| 11 | 11.9 | 5:32 | 5:28 |
| 12 | 11.9 | 5:32 | 5:28 |
| 13 | 11.9 | 5:31 | 5:28 |
| 14 | 12.0 | 5:31 | 5:28 |
| 15 | 12.0 | 5:30 | 5:28 |
| 16 | 12.0 | 5:30 | 5:27 |
| 17 | 12.0 | 5:29 | 5:27 |
| 18 | 12.0 | 5:28 | 5:27 |
| 19 | 12.0 | 5:28 | 5:27 |
| 20 | 12.0 | 5:27 | 5:27 |
| 21 | 12.0 | 5:27 | 5:27 |
| 22 | 12.0 | 5:26 | 5:26 |
| 23 | 12.0 | 5:26 | 5:26 |
| 24 | 12.0 | 5:25 | 5:26 |
| 25 | 12.0 | 5:25 | 5:26 |
| 26 | 12.0 | 5:24 | 5:26 |
| 27 | 12.0 | 5:24 | 5:26 |
| 28 | 12.0 | 5:23 | 5:25 |
| 29 | 12.0 | 5:22 | 5:25 |
| 30 | 12.1 | 5:22 | 5:25 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.76 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 4.98 kWh/m² to a high of 6.76 kWh/m² in September across the year — September's 6.76 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) | 6.5 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 |
| Level | 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 | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.5 | Intense |
| 2 | 6.6 | Intense |
| 3 | 6.6 | Intense |
| 4 | 6.6 | Intense |
| 5 | 6.6 | Intense |
| 6 | 6.6 | Intense |
| 7 | 6.7 | Intense |
| 8 | 6.7 | Intense |
| 9 | 6.7 | Intense |
| 10 | 6.7 | Intense |
| 11 | 6.7 | Intense |
| 12 | 6.7 | Intense |
| 13 | 6.8 | Intense |
| 14 | 6.8 | Intense |
| 15 | 6.8 | Intense |
| 16 | 6.8 | Intense |
| 17 | 6.8 | Intense |
| 18 | 6.8 | Intense |
| 19 | 6.8 | Intense |
| 20 | 6.8 | Intense |
| 21 | 6.8 | Intense |
| 22 | 6.8 | Intense |
| 23 | 6.8 | Intense |
| 24 | 6.8 | Intense |
| 25 | 6.8 | Intense |
| 26 | 6.8 | Intense |
| 27 | 6.8 | Intense |
| 28 | 6.8 | Intense |
| 29 | 6.8 | Intense |
| 30 | 6.8 | Intense |
Hazard calendar for Lasem
None of Lasem's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Lasem sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Lasem's rainy season runs November–April, when most of the year's rain falls.
Is September a good time to visit Lasem?
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 Lasem for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Lasem in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Lasem sees daytime highs around 31°C and nights near 25°C. Pack light clothes and sun protection. About 5 days see rain.
Sea temperature near Lasem in September
The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore 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 | 29 | 28 | 29 | 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 | 29 | Tropical |
| Aug | 28 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 30 | Tropical |
| Dec | 30 | Tropical |
UV index in Lasem in September
Clear-sky midday UV in September peaks 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 Lasem peaks around March 17 at about 14 (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) | 10 | 10 | 14 | 11 | 9 | 8 | 9 | 11 | 12 | 12 | 7 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Extreme |
| Feb | 10 | Extreme |
| Mar | 14 | Extreme |
| Apr | 11 | Extreme |
| May | 9 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 7 | Very high |
| Dec | 11 | Extreme |
Air quality in Lasem 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 Lasem is worst in May — around 40 µg/m³ PM2.5 (poor), 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) | 27 | 25 | 32 | 35 | 40 | 37 | 34 | 33 | 35 | 39 | 34 | 30 |
| Level | Moderate | Moderate | Moderate | Poor | Poor | Poor | Moderate | Moderate | Poor | Poor | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 27 | Moderate |
| Feb | 25 | Moderate |
| Mar | 32 | Moderate |
| Apr | 35 | Poor |
| May | 40 | Poor |
| Jun | 37 | Poor |
| Jul | 34 | Moderate |
| Aug | 33 | Moderate |
| Sep | 35 | Poor |
| Oct | 39 | Poor |
| Nov | 34 | Moderate |
| Dec | 30 | Moderate |
Where is Lasem?
Lasem sits at 6.7°S, 111.5°E, 12 m above sea level, in Indonesia. The nearest listed city is Rembangan, 12 km away.
Topography around Lasem
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lasem.
Within 3 km, the terrain around Lasem has significant variations in elevation — a maximum elevation change of 251 m around an average of 28 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 787 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,559 m.
The land around Lasem is covered by trees (38%) and cropland (21%) within 3 km, water (40%) and trees (34%) within 16 km, and water (36%), trees (35%) and cropland (24%) 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 Lasem (-6.6922°, 111.4527°, elevation 12 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).