Lasem in Spring
In spring (September, October and November), Lasem sees average daytime highs around 30°C and overnight lows near 25°C, with 301 mm of rain over about 41 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Across spring, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 28% of the time across spring, and the air most often feels oppressive.
Spring is Lasem's 2nd-best season to visit on our travel score. Lasem 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 Lasem's year-round climate.
- Avg daytime high
- 30°C
- warmest season of the year
- Avg overnight low
- 25°C
- Rainfall
- 301 mm
- 41 wet days
- Avg wind
- 10 km/h
- Travel score
- 4.3
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Lasem in Spring
Across spring, daytime highs hold fairly steady around 30°C.
A typical spring day in Lasem reaches about 30°C and drops to 25°C overnight. The warmest of the three months is October, the coolest September.
How spring really feels in Lasem
Once humidity and wind are folded in, spring brings about 91 days that feel above 32°C and 0 that feel at or below 0°C.
The story in spring is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Lasem weather by month
How the three spring 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° | 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 Spring
The sky is clear or mostly clear about 28% of the time across spring.
Chance of precipitation in Spring
Lasem gets around 301 mm of rain over 41 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 10 km/h across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 h 54 min in early September to 12 h 24 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.5 kWh/m².
Hazard calendar for Lasem
In spring, Lasem overlaps its cyclone and rainy season season. The full year is below, with each hazard's peak months called out.
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 spring a good time to visit Lasem?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring 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 Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Lasem sees daytime highs around 30°C and nights near 25°C. Pack light clothes, rain gear and sun protection. About 41 days see rain.
Sea temperature near Lasem in Spring
The nearest coast averages about 29°C across spring — 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 Spring
Clear-sky midday UV across spring averages around 10 (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 Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring 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.