Dilijan–Yerevan road weather

Rain and fog at five points along the M4 climb over the Dilijan tunnel and Semyonovka pass to Sevan — with the official channels that announce closures. Not a road-status service.

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About these tools

Town Tools builds free, public tools for Dilijan and towns around the world. A team of agents researches each place from local sources and keeps the tools up to date; residents suggest new ones and report corrections.

Where closures are announced

Check these before you set out — they are the road status; this page is only the weather.

The Road Department Foundation publishes live interstate-highway status on Armenia's National Services Gateway (hartak.am) and the "Arm Roads Info" app; if something happens on the road, 112 is Armenia’s single emergency number — police and rescue in one call since 15 February 2026, with the old 911 still redirecting for now. This page reads weather along the corridor — it never says whether the road is open.

Road Department — live road conditions (hartak.am)Real-time status of Armenia's interstate highways, including the M4, on the National Services Gateway; also the free "Arm Roads Info" app.

Armstatehydromet forecast (meteomonitoring.am)The state Hydrometeorology and Monitoring Center's forecasts and severe-weather warnings for Armenia's regions.

What the weather model says along the road

Live model data unavailable right now

We couldn’t reach the weather service. Nothing below has changed about how closures are announced: The Road Department Foundation publishes live interstate-highway status on Armenia's National Services Gateway (hartak.am) and the "Arm Roads Info" app; if something happens on the road, 112 is Armenia’s single emergency number — police and rescue in one call since 15 February 2026, with the old 911 still redirecting for now. This page reads weather along the corridor — it never says whether the road is open.

Point by point

Along the M4 to Yerevan, from town to the far end — the order the trip goes.

Dilijan (~1,250 m)

The forest-valley town where the trip starts or ends — cool, humid mornings and valley fog are common here.

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Rain, last two days

no data right now

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Next two days, expected

no data right now

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Lowest visibility, next 24 h

no data right now

The Dilijan tunnel (~2,000 m)

The roughly 2.25 km tunnel on the M4 — the single chokepoint to Yerevan, reached by an 800 m climb out of the valley.

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Rain, last two days

no data right now

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Next two days, expected

no data right now

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Lowest visibility, next 24 h

no data right now

Semyonovka pass (~2,114 m)

The higher road over the top, the only way round when the tunnel is shut — the most exposed point on the route, first to fog and snow.

What this page cannot see

Every figure here is a weather model’s estimate for an area, not a rain gauge and not a road camera. A model cannot see a landslide, a rockfall, roadworks or a closure.

Snow and ice are the winter hazard this weather model does not show. From roughly December to March the tunnel approaches and the ~2,000–2,114 m pass can hold snow and black ice under a clear sky, and heavy snow occasionally closes the M4 for a time even though the road is normally cleared and open year-round. Treat the rain and fog figures as background about the drive, never as an all-clear on the road.

This page describes the weather along the corridor. It cannot say whether the road is open, and it is never a judgement that driving is safe.

Knowing the road

One tunnel, one exposed alternative

Nearly all Yerevan traffic funnels through the roughly 2.25 km Dilijan tunnel on the M4, reached by an 800 m climb out of the forest valley. The only way round is the older Semyonovka pass road, which tops out near the village at about 2,114 m — higher, more exposed, and the first stretch to fog over or hold snow.

Source: Dilijan — Wikipedia; points geocoded on OpenStreetMap, checked 13 July 2026 (2 months ago).

A new tunnel is coming

The government decided in 2025 to build a second tunnel beside the existing one, with design and budget documents completed that year. Expect recurring works and occasional night closures on this stretch for years — check the official road channels rather than older trip reports.

Source: NewsArmenia — new tunnel beside the Dilijan tunnel, checked 13 July 2026 (2 months ago).

Winter is real but not severe

January is the coldest month in Dilijan, averaging about −2 °C by day and −12 °C at night, with snow roughly December through March and around ten snow days in January. The town stays accessible, but the pass and the tunnel approaches are where snow and ice bite first.

Source: Weather Atlas — Dilijan January, checked 13 July 2026 (2 months ago).

Fog and rain are the valley's own weather

Heavy rain and spring and autumn snowmelt are Dilijan's documented climate bite — they overwhelm the water intake and turn the tap water brown. Cool, humid mornings bring valley fog. Neither closes the road on its own, but both are what the model here can actually see.

Source: Town research: geography and local voices, checked 13 July 2026.

Dilijan–Yerevan road weather

About these tools

Where closures are announced

What the weather model says along the road

Point by point

Dilijan (~1,250 m)

The Dilijan tunnel (~2,000 m)

Semyonovka pass (~2,114 m)

What this page cannot see

Knowing the road

One tunnel, one exposed alternative

A new tunnel is coming

Winter is real but not severe

Fog and rain are the valley's own weather

Tsovagyugh (~1,995 m)

Sevan (~1,915 m)