Do Dengue Mosquitoes Bite at Night? Aedes vs Culex Biting Hours in Singapore
Aedes dengue mosquitoes bite in the day with dawn and dusk peaks, but can bite at night in lit flats. Culex is the night biter. What it means for your home.
Short answer: the Aedes mosquito that spreads dengue is a day biter, most active in daylight with peaks around sunrise and sunset. But in Singapore it also bites at night, because our flats and void decks are lit well enough for it to keep hunting. The one whining near your ear at 2 am is more likely a Culex, which does not carry dengue here but bites just as happily.
That distinction matters, because most of us only think about mosquitoes at bedtime. If dengue mosquitoes are biting at 7 am while you make breakfast with the kitchen window open, or at 4 pm while the kids nap, then repellent at night and a plug-in by the bed are protecting you at the wrong hours. Here is what NEA says about biting hours, how to tell Aedes from Culex, how to tell a mosquito bite from a bed bug bite, and where the 2026 season stands.
What NEA says about night biting
NEA answers this directly in its NEA Vox series. Asked whether it is true that the Aedes mosquito does not bite at night, the reply is: "The Aedes mosquito is generally day-biting and most active during daylight hours, with peak biting at dawn (soon after sunrise) and dusk (just before sunset). However, in Singapore's well-lit urban environment, the Aedes mosquito may also bite at night, as it has adapted to artificial lighting."
The gov.sg dengue page says the same: peak biting is soon after sunrise and just before sunset.
So the honest picture is: mostly day, worst around 7 am and 7 pm, and not zero at night if the lights are on. Only the females bite, and an adult Aedes lives about two weeks, biting several times over that span.
Aedes vs Culex: who is biting you, and when
Singapore has over 180 mosquito species but only a handful bother people at home. NEA's mosquito species page sums up the ones that matter.
| Mosquito | How it looks | When it bites | Where it breeds | Disease risk in Singapore |
|---|---|---|---|---|
| Aedes aegypti | Black and white stripes, lyre-shaped white marking on the back | Day, also at night in lit areas | Flowerpots, gutters, water containers in and around homes | Main dengue carrier; also Zika, chikungunya |
| Aedes albopictus | Black and white stripes, single white line on the back | Day, also at night in lit areas | Same as above, plus tree holes and leaf litter near greenery | Dengue (less efficient carrier), chikungunya |
| Culex quinquefasciatus | Golden-brown, dark proboscis | Night | Blocked drains | Japanese encephalitis and filariasis, neither endemic here |
| Anopheles | Light brown, pale and dark scales on legs and wings | Night | Sunlit brackish pools with algae | Malaria, not endemic here |
A rough field guide: bitten on the ankles at your desk in the afternoon by something small, striped and quiet? That is Aedes, the one worth worrying about. Something brown buzzing loudly around your head after midnight? Usually Culex, a nuisance rather than a dengue risk, but the reason many people assume all mosquitoes are night creatures and guard only the bedroom.
If your estate is a Project Wolbachia release site, note that the programme suppresses only Aedes aegypti; Culex and Aedes albopictus carry on regardless, which is a big part of why residents there still report bites.
Why the biting hours change what you should do at home
Most home mosquito defences are bedtime habits: repellent before sleep, a plug-in vaporiser in the bedroom, maybe a bed net for the baby. Those are fine for Culex. They do little against a day biter, because at 8 am and 6 pm you are in the kitchen or living room, windows open, no repellent on. And the people at home in the day (young children napping, elderly parents, anyone working from home) are the ones collecting the Aedes bites, in the rooms with the windows open longest.
Clean and Green Singapore's Block Dengue tips reflect this. Alongside repellent, they list "installing mosquito screens on windows/doors to keep mosquitoes out of your home" and "sleeping under a mosquito net (especially during the day since Aedes aegypti mosquitoes are day-biting)". The takeaway: whatever you do at night, you also need something that works at 7 am and 7 pm, when you are not thinking about it. A screen on the openings that stay open all day, and no stagnant water anywhere in the flat, cover those hours without any effort from you.
Is it a mosquito bite or a bed bug bite?
This comes up more than you would expect. In one HardwareZone thread, someone had 35 bites in three days with windows shut and NEA finding no breeding, and several replies suspected bed bugs. Worth ruling out before you spend on any mosquito fix.
| Mosquito bite | Bed bug bite | |
|---|---|---|
| Pattern | Isolated, random, on skin that clothing does not cover | Clusters, often in a line or zigzag of three to five |
| Timing | Itchy and visible almost immediately | Often unnoticed at the time; reaction hours or days later |
| Where | Any exposed skin, day or night | Skin exposed while sleeping, such as ankles, arms, neck |
| How long | Usually better in a day or two | Around a week |
| Do you see or hear the culprit? | Often yes, especially Culex at night | Rarely; check mattress seams for tiny dark spots |
The bite descriptions above follow the summary from Medical News Today. If your bites are in neat lines, appear overnight without you ever hearing a mosquito, and mesh plus a stagnant-water check changes nothing, look at the bed before you look at the window.
The 2026 dengue season so far (updated August 2026)
This is the section that dates, so here is where things stand as of mid August 2026. We will refresh it each season.
- Peak season is May to October. NEA marked the start of peak season on 16 May 2026 and flagged low population immunity and all four serotypes circulating as risk factors.
- DENV-3 is the dominant serotype. NEA's Q2 2026 surveillance data shows DEN-3 accounting for the majority of typed samples from April to June, followed by DEN-2, DEN-1 and DEN-4. Serotype matters because immunity to one does not protect against another.
- Case numbers are moderate. 770 cases were reported from April to June, an 87.8% jump on the first quarter, with 46 clusters and over 4,000 breeding habitats found. NEA's dengue cases page shows 96 cases in the week ending 15 August and 1,986 for the first 32 weeks of the year. For comparison, 2024 saw 13,651 cases and 2025 just over 4,000.
- Breeding is mostly at home. The Q2 top five home habitats were pails, flowerpots, flowerpot plates, vases and refuse bins outside landed houses. At 2025 clusters, about 65% of breeding was inside homes.
Numbers are low compared to 2024, but low immunity plus a serotype switch is the setup NEA worries about, which is why the vigilance messaging has not eased.
Where window mesh fits, honestly
Mesh does one thing well: it keeps mosquitoes that are outside from coming in through an open window or door, at 7 am, 3 pm and 2 am alike, without you doing anything. For a day biter that is the whole point, because nobody applies repellent for a morning at home. Our insect mesh guide for Singapore windows covers weave sizes and prices, and can mosquitoes go through window mesh explains why the weave itself is not the weak point.
What mesh does not do: stop a mosquito that hatched in your own floor trap or flowerpot plate, help at the lift lobby, or do anything about the neighbour's corridor garden. If you screen every window and still get bitten, run the B-L-O-C-K check before you blame the mesh; our high floor mosquito guide lists the other ways in.
If you would like to close the daytime gap, WhatsApp us a few photos of your windows and we can give you a rough idea. The site visit is free and there is no obligation.
Frequently asked questions
What time of day do dengue mosquitoes bite?
Aedes mosquitoes are day biters, most active in daylight with peaks soon after sunrise and just before sunset. NEA notes that in Singapore's well-lit urban environment they may also bite at night, having adapted to artificial lighting. So the riskiest hours are early morning and early evening, but a lit flat is never fully off the clock.
Which mosquito bites at night in Singapore?
Mostly Culex, the golden-brown mosquito that breeds in blocked drains and hunts after dark. It does not spread dengue in Singapore, though its bites itch just as much. Aedes can also bite at night indoors when the lights are on, so a bite after midnight is not proof that it was harmless.
Can you get dengue from a bite at night?
Yes, if the mosquito is an Aedes. NEA's guidance is that Aedes may bite at night in lit urban settings, so a night-time bite in a bright flat carries some risk. Most Aedes bites still happen in the day, though, which is why daytime barriers matter more than most people assume.
How do I tell a mosquito bite from a bed bug bite?
Mosquito bites are scattered, itch straight away and fade in a day or two. Bed bug bites come in clusters or lines of three to five, are often not felt at the time, show up hours later on skin exposed in bed, and take about a week to settle. If you never hear a mosquito and the bites are in rows, check the mattress seams.
Sources
MeshMates product specifications are from our own product pages.
- NEA — Is it true that the Aedes mosquito does not bite at night? (NEA Vox). nea.gov.sg
- gov.sg — Stop Dengue Now with B-L-O-C-K. gov.sg
- NEA — Aedes Mosquito (life cycle and biting). nea.gov.sg
- NEA — Understanding Singapore's Mosquito Landscape: Why Different Species Matter (Annex B). nea.gov.sg
- Clean and Green Singapore — Tips and FAQs (Block Dengue). cgs.gov.sg
- HardwareZone Forums — Mosquito problem, any tips? (Sep 2024). forums.hardwarezone.com.sg
- Medical News Today — Bed bug bites vs. mosquito bites: What to know. medicalnewstoday.com
- NEA — Singapore Enters Peak Dengue Season, Public Urged to Stay Vigilant (16 May 2026). nea.gov.sg
- NEA — Dengue Surveillance Data, Apr to Jun 2026 (PDF). nea.gov.sg
- NEA — Dengue Cases (weekly figures). nea.gov.sg
MeshMates installs cat mesh and insect mesh frames across Singapore. Frames are custom-cut to your window size, and a free site visit is included before you commit. If you're unsure which mesh type or model suits your home, send us a photo and we'll give a recommendation.
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