AI-generatedSemarang at a glance
- Best time
- Jul – Aug
- Warmest month
- Sep · 34°
- Warmest sea
- Nov · 29.9°
- Sunshine a year
- 2,260 h
- Rain a year
- 2,119 mm
- Climate
- Tropical
- Time zone
- UTC+7
- Elevation
- 18 m
Climate in Semarang
Semarang has a tropical climate: it is warm all year round, and the seasons differ mainly in how much rain falls. September is the warmest month with average highs of 34 °C, while January is the coolest at 29 °C. With around 2,260 hours of sunshine a year, Semarang is sunny; August is the sunniest month with 8.0 hours a day.
Holiday weather through the year
Best time to visit Semarang
The best time to visit Semarang is from July to August. For a beach holiday – sea from 21 °C, warm and mostly dry – go from June to September. From August to October it can get very hot, with highs of up to 34 °C. The rainy season is from November to March; the wettest month is December with 343 mm.
Semarang through the seasons
How the weather changes over the seasons, with averages for each.
Semarang in the dry season
Apr – Oct
Fair
- 31–34 °C by day
- Sea 29 °C
- 7.1 h of sun a day
- 80 rainy days in all
Semarang in the rainy season
Nov – Mar
Poor
- 29–32 °C by day
- Sea 29 °C
- 4.9 h of sun a day
- 136 rainy days in all
Which month for what?
Beach & swimming
Jun – Sep
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Peak heat
Aug – Oct
Highs of 33 °C or more
Rainy months
Nov – Mar
Rainy season or more than 12 rainy days
Find your perfect month
Tell us what you like and we rate every month in Semarang for you.
Your best months: July – September
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Poor
Best time to visit: July – August
Where to go in OctoberSea temperature in October
Keep in mindPeak heat
A typical day in October
- Morning, 08:00: about 29°
- Midday, 13:00: about 34°
- Afternoon, 16:00: about 32°
- Evening, 20:00: about 28°
- Night, 23:00: about 26°
05:1617:31
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 05:04–05:44 · evening 17:04–17:44
- Blue hour
- Morning 04:55–05:04 · evening 17:44–17:52
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Semarang compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 34° at the start of the month to 33° at the end. The sea warms from 29° to 30°.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 34° | 33° |
| Night-time low | 23° | 23° |
| Sea | 29° | 30° |
| Daylight | 12.2 h | 12.3 h |
What is the weather like in Semarang in October?
In October, Semarang is very hot: daytime highs average 34 °C, and even at night it stays warm at around 23 °C. The sea averages 29.5 °C – almost as warm as a bath. The sun shines for around 7.1 hours a day. Rain is frequent, with about 14 rainy days and 126 mm in total. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is not an ideal month for a holiday in Semarang.
More details for October
- Daylight
- 12 h 15 min05:16 – 17:31
- UV index
- 14 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 10 km/haverage daily peakAll months
- Cloud cover
- 70 %on averageAll months
- Hot days
- 30 days30 °C or moreAll months
- Time zone
- UTC+7offset from UTC
How the score comes together
- Temperatureweight 50 %16 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 30 %30 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Compare two months in Semarang
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Semarang: score 55 against 31. In July, days are 1 °C cooler than in October. The sea is 1 °C cooler in July. July has 8 fewer rainy days. The sun shines an hour longer a day in July.
| Month | October | July |
|---|---|---|
| Holiday weather score | 31 | 55better |
| Daytime high | 34° | 33° |
| Night-time low | 23° | 22° |
| Sea | 29.5° | 28.9° |
| Sunshine | 7.1 h | 7.6 hbetter |
| Rainy days | 14 | 6better |
| Rainfall | 126 mm | 31 mmbetter |
| Muggy days | 30 | 27better |
Based on the climate averages 1996–2025.
Semarang month by month
The typical weather for every month at a glance.
42January29° · Sea 29° · 4.4 h
In January, Semarang is hot: daytime highs average 29 °C, and even at night it stays warm at around 23 °C. The sea averages 29.0 °C – almost as warm as a bath. Expect around 4.4 hours of sunshine a day. It is the rainy season: rain falls on about 29 days, totalling 337 mm. On about 8 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, January is a so-so month for a holiday in Semarang.
Semarang in January42February29° · Sea 29° · 4.4 h
In February, Semarang is hot: daytime highs average 29 °C, and even at night it stays warm at around 23 °C. The sea averages 28.6 °C – lovely and warm for swimming. Expect around 4.4 hours of sunshine a day. It is the rainy season: rain falls on about 27 days, totalling 314 mm. On about 6 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, February is a so-so month for a holiday in Semarang.
Semarang in February37March30° · Sea 29° · 5.2 h
In March, Semarang is hot: daytime highs average 30 °C, and even at night it stays warm at around 23 °C. The sea averages 29.0 °C – almost as warm as a bath. Expect around 5.2 hours of sunshine a day. It is the rainy season: rain falls on about 28 days, totalling 301 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, March is not an ideal month for a holiday in Semarang.
Semarang in March33April31° · Sea 30° · 5.8 h
In April, Semarang is hot: daytime highs average 31 °C, and even at night it stays warm at around 23 °C. The sea averages 29.7 °C – almost as warm as a bath. Expect around 5.8 hours of sunshine a day. It rains often – on about 24 days, adding up to 199 mm. On about 27 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, April is not an ideal month for a holiday in Semarang.
Semarang in April36May32° · Sea 30° · 6.5 h
In May, Semarang is hot: daytime highs average 32 °C, and even at night it stays warm at around 23 °C. The sea averages 29.8 °C – almost as warm as a bath. The sun shines for around 6.5 hours a day. It rains often – on about 16 days, adding up to 103 mm. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is not an ideal month for a holiday in Semarang.
Semarang in May48June32° · Sea 29° · 6.9 h
In June, Semarang is hot: daytime highs average 32 °C, and even at night it stays warm at around 22 °C. The sea averages 29.4 °C – almost as warm as a bath. The sun shines for around 6.9 hours a day. Rain is frequent, with about 10 rainy days and 61 mm in total. On about 28 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is a so-so month for a holiday in Semarang.
Semarang in June55July33° · Sea 29° · 7.6 h
In July, Semarang is hot: daytime highs average 33 °C, and even at night it stays warm at around 22 °C. The sea averages 28.9 °C – lovely and warm for swimming. The sun shines for around 7.6 hours a day. Rain falls on about 6 days, adding up to 31 mm. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is a so-so month for a holiday in Semarang – and yet one of the best months here.
Semarang in July55August34° · Sea 29° · 8.0 h
In August, Semarang is very hot: daytime highs average 34 °C, and even at night it stays warm at around 22 °C. The sea averages 28.7 °C – lovely and warm for swimming. The sun shines for around 8.0 hours a day. Rain is rare: about 4 days bring 23 mm in total. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, August is a so-so month for a holiday in Semarang – and yet one of the best months here.
Semarang in August47September34° · Sea 29° · 7.9 h
In September, Semarang is very hot: daytime highs average 34 °C, and even at night it stays warm at around 23 °C. The sea averages 29.1 °C – almost as warm as a bath. The sun shines for around 7.9 hours a day. Rain falls on about 5 days, adding up to 37 mm. The thermometer climbs to 30 °C or more every day. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Semarang.
Semarang in September31October34° · Sea 30° · 7.1 h
In October, Semarang is very hot: daytime highs average 34 °C, and even at night it stays warm at around 23 °C. The sea averages 29.5 °C – almost as warm as a bath. The sun shines for around 7.1 hours a day. Rain is frequent, with about 14 rainy days and 126 mm in total. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is not an ideal month for a holiday in Semarang.
Semarang in October31November32° · Sea 30° · 5.8 h
In November, Semarang is hot: daytime highs average 32 °C, and even at night it stays warm at around 23 °C. The sea averages 29.9 °C – almost as warm as a bath. Expect around 5.8 hours of sunshine a day. It is the rainy season: rain falls on about 24 days, totalling 245 mm. On about 24 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, November is not an ideal month for a holiday in Semarang.
Semarang in November38December30° · Sea 30° · 4.7 h
In December, Semarang is hot: daytime highs average 30 °C, and even at night it stays warm at around 23 °C. The sea averages 29.6 °C – almost as warm as a bath. Expect around 4.7 hours of sunshine a day. It is the rainy season: rain falls on about 28 days, totalling 343 mm. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is not an ideal month for a holiday in Semarang.
Semarang in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Semarang
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Warm 20–24°
- muggy month (15+ muggy days)
WarmOctober: nights around 23°. Tropical nights: a fan or air conditioning helps. Muggy on about 30 days (dew point 18 °C or more).
The coolest nights are in July (22°), the warmest in October (23°). Nights stay tropical all year (20 °C and more), so a room with air conditioning or at least a fan pays off. It is muggy (dew point 18 °C or more) all year, on about 348 days a year.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 42 | 29° | 23° | 29.0° | 4.4 h | 29 | 337 |
| FebruaryFeb | 42 | 29° | 23° | 28.6° | 4.4 h | 27 | 314 |
| MarchMar | 37 | 30° | 23° | 29.0° | 5.2 h | 28 | 301 |
| AprilApr | 33 | 31° | 23° | 29.7° | 5.8 h | 24 | 199 |
| MayMay | 36 | 32° | 23° | 29.8° | 6.5 h | 16 | 103 |
| JuneJun | 48 | 32° | 22° | 29.4° | 6.9 h | 10 | 61 |
| JulyJul | 55 | 33° | 22° | 28.9° | 7.6 h | 6 | 31 |
| AugustAug | 55 | 34° | 22° | 28.7° | 8.0 h | 4 | 23 |
| SeptemberSep | 47 | 34° | 23° | 29.1° | 7.9 h | 5 | 37 |
| OctoberOct | 31 | 34° | 23° | 29.5° | 7.1 h | 14 | 126 |
| NovemberNov | 31 | 32° | 23° | 29.9° | 5.8 h | 24 | 245 |
| DecemberDec | 38 | 30° | 23° | 29.6° | 4.7 h | 28 | 343 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
6.99° S, 110.42° E · 18 m · Asia/Jakarta
Sea temperature in Semarang
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 29.1 – 29.8 °C
Swimming season: all year
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Semarang ranges from 28.6 °C in February to 29.9 °C in November. At 20 °C and more, the sea is warm enough for swimming all year round.
The sea warms up slowly: it is warmest in November, while the air already peaks in September. The sea temperature varies from year to year: in November, eight out of ten years were between 29.5 and 30.4 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 29.0° | 28.3° | 29.7° | very warm |
| FebruaryFeb | 28.6° | 27.6° | 29.4° | warm |
| MarchMar | 29.0° | 28.5° | 29.6° | very warm |
| AprilApr | 29.7° | 29.2° | 30.2° | very warm |
| MayMay | 29.8° | 29.4° | 30.2° | very warm |
| JuneJun | 29.4° | 29.1° | 29.8° | very warm |
| JulyJul | 28.9° | 28.3° | 29.4° | warm |
| AugustAug | 28.7° | 28.1° | 29.3° | warm |
| SeptemberSep | 29.1° | 28.6° | 29.5° | very warm |
| OctoberOct | 29.5° | 29.1° | 29.8° | very warm |
| NovemberNov | 29.9° | 29.5° | 30.4° | very warm |
| DecemberDec | 29.6° | 29.2° | 30.0° | very warm |
Sunshine hours in Semarang
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 7.1 of 12.2 hours of daylight in Semarang, 58 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Semarang: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Semarang has about 14 rainy days with 126 mm of rain in total.
UV index in Semarang
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 14 · extremeAvoid the midday sun; SPF 50+, covering clothes, hat and sunglasses.
The sun is strongest in October (UV 14).
Minutes until sunburn in October
- Very fair skin
- about 10 min
- Fair skin
- about 10 min
- Light brown skin
- about 15 min
- Olive skin
- about 20 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Semarang
How breezy and how cloudy Semarang is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Semarang typically peaks at 10 km/h during the day: Beaufort 2, light breeze or less.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 70 % of the sky over Semarang: mostly cloudy, with about 7.1 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Semarang
How often the day gets hot in Semarang (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Semarang has about 30 hot days, with an average daytime high of 34 °C: hot and muggy. Plan outdoor activities for the morning and evening, drink a lot and take breaks in the cool.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Planning a trip to Semarang
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Semarang in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Semarang has its best school-holiday weather during the summer holidays (score 55) and its weakest during October half-term (score 31).
- 34
Easter holidays
Mar – Apr
Poor
- 31 °C by day
- Sea 29 °C
- 5.6 h of sun a day
- 26 rainy days a month
Keep in mind: Frequent rain
- 38
May half-term
May – Jun
Poor
- 32 °C by day
- Sea 30 °C
- 6.6 h of sun a day
- 15 rainy days a month
- 55
Summer holidays
Jul – Aug
FairBest holidays
- 33 °C by day
- Sea 29 °C
- 7.9 h of sun a day
- 5 rainy days a month
Good for: Beach & swimming
Keep in mind: Peak heat
- 31
October half-term
Oct
Poor
- 34 °C by day
- Sea 30 °C
- 7.1 h of sun a day
- 14 rainy days a month
Keep in mind: Peak heat
- 40
Christmas holidays
Dec – Jan
Fair
- 30 °C by day
- Sea 29 °C
- 4.6 h of sun a day
- 28 rainy days a month
Keep in mind: Frequent rain
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 15 h
- Distance
- 12,050 km
- Time zone
- UTC+7
- Jet lag
- About 6 days (6 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Semarang compared
Put Semarang side by side with another destination.
Semarang vs Surakarta
In October the holiday weather in Semarang and Surakarta is about equally good (score 31 vs 33). During the day Surakarta is 1 °C cooler than Semarang.
| in October | Semarang | Surakarta |
|---|---|---|
| Holiday weather score | 31 | 33 |
| Daytime high | 34° | 33° |
| Sea | 30° | no sea nearby |
| Sunshine | 7 h | 7 h |
| Rainy days | 14 | 13 |
| Best time | Jul – Aug | Jul – Aug |
Through the year
Indonesia in October: the best places
In October, Semarang ranks 19 among the 31 nearest destinations in this country.
- Komodo Island30°28°99
- 2Gili Trawangan31°29°81
- 3Senggigi32°29°79
- 4Kuta29°27°76
- 5Sanur29°28°76
- 6Nusa Dua29°27°76
- 7Gili Air32°29°76
- 8Nusantara31°29°62
- 19SemarangThis page34°30°31
Near Semarang
Other destinations close by.
Places with a climate like Semarang
Destinations whose weather through the year is closest to Semarang's – good alternatives.
Frequently asked questions about Semarang
When is the best time to visit Semarang?
The best time to visit Semarang is from July to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Semarang?
The sea temperature in Semarang ranges from 28.6 °C in February to 29.9 °C in November. At 20 °C and more, the sea is warm enough for swimming all year round.
Can you swim in Semarang in October?
Yes. In October the sea averages 29.5 °C – almost as warm as a bath.
What is the warmest month in Semarang?
September is the warmest month, with average highs of 34 °C and nights around 23 °C. January is the coolest month at 29 °C.
When does it rain most in Semarang?
The rainy season is from November to March; the wettest month is December with 343 mm. The driest month is August with 23 mm.
How many hours of sunshine does Semarang get?
Semarang gets around 2,260 hours of sunshine a year. The sunniest month is August with 8.0 hours a day; in January there are 4.4 hours a day.
What time zone is Semarang in?
Semarang is on UTC+7 all year.
How long is the flight from London to Semarang?
A nonstop flight from London to Semarang takes about 15 h, for a straight-line distance of about 12,050 km. Most routes need a change of planes, which adds time.
Which school holidays are best for Semarang?
Semarang has its best school-holiday weather during the summer holidays (score 55) and its weakest during October half-term (score 31). Holiday ratings (0–100): Easter holidays 34, May half-term 38, summer holidays 55, October half-term 31, Christmas holidays 40.