Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 28.7 °C | 29.3 °C | 28 days | Unfavourable season |
| February | 28.4 °C | 28.8 °C | 27 days | Unfavourable season |
| March | 29.1 °C | 29.3 °C | 27 days | Unfavourable season |
| April | 30.1 °C | 30 °C | 24 days | Unfavourable season |
| May | 31.5 °C | 29.9 °C | 15 days | Possible, with trade-offs |
| June | 31.8 °C | 29.6 °C | 14 days | Possible, with trade-offs |
| July | 32.7 °C | 29.1 °C | 7 days | Ideal — one of the best times of year |
| August | 33.4 °C | 28.8 °C | 5 days | Ideal — one of the best times of year |
| September | 33.5 °C | 29.2 °C | 9 days | Ideal — one of the best times of year |
| October | 32.8 °C | 29.6 °C | 14 days | Possible, with trade-offs |
| November | 31 °C | 30 °C | 25 days | Unfavourable season |
| December | 29.3 °C | 29.7 °C | 27 days | Unfavourable season |
Nearby in April
Before you go
Three things to check once you have picked your dates.
Entry
Visa issued on arrival (500,000 Indonesian rupiah) for stays of up to 30 days. Passport valid for at least 6 months. VOA costs 500,000 rupiah (cash or card), single entry, extendable once for 30 days; fill in the All Indonesia declaration online within 72 hours of arrival.
For a British passport, per the UK Foreign Office on 10 September 2026. Rules change: check before booking.
Safety
Outside the areas advised against
Parts of the country are advised against (the immediate surroundings of several active volcanoes (Lewotobi Laki-Laki, Sinabung, Marapi, Semeru, Ruang, Ibu)); Semarang is not one of them.
Official advice updated 10 September 2026
Health
CDC level 2 notice: Zika
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; rabies, Japanese encephalitis and chikungunya depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. Certificate required only if you arrive from a country with yellow fever risk.
Malaria · Present. Areas: All areas of eastern Indonesia (the provinces of Maluku, North Maluku, East Nusa Tenggara, Papua, and West Papua), including the town of Labuan Bajo and the Komodo Islands in the Nusa Tenggara region Rural areas of Kalimantan (Borneo), West Nusa Tenggara (includes the island of Lombok), Sulawesi, and Sumatra Low transmission in rural areas of Java, including Pangandaran, Sukabumi, and Ujung Kulon No malaria transmission in the cities of Jakarta (the capital) or Ubud No malaria transmission in the resort areas of Bali or Java, the Gili Islands, or the Thousand Islands (Pulau Seribu). Preventive medication recommended: Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine — prescribed before departure.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Semarang in April?
The sea averages 30°C in April — yes, pleasant swimming.
How hot is Semarang in April?
Expect 30.1°C in the afternoon and 24.5°C at night, averaged over the last 10 years.
Does it rain a lot in Semarang in April?
Around 24 days with rain (≥ 1 mm) in the month — 81% of days.