Sikkim in June splits cleanly into two halves. The first 10 days are pre-monsoon — clear weather, dropping crowds as school holidays end, hotel rates softening, and North Sikkim still fully open. The monsoon usually arrives between 15 and 25 June; from that point onwards rainfall climbs sharply (Darjeeling jumps from 160 mm in May to 419 mm in June), the high-altitude road past Chungthang becomes weather-dependent, and the trip plan needs a buffer day. The first half of June is one of our favourite quieter windows. The second half needs a different itinerary entirely. Here is the honest split.
First half of June — the last good week
June 1 to 10 is essentially May weather with May infrastructure but without May crowds. Indian school holidays end around 5 to 8 June in most states; the family-traveller wave thins quickly. Gangtok daytime 20-23°C, Lachung 14-18°C, Gurudongmar accessible with morning departures still running on schedule. Hotel rates drop 15 to 20 per cent from peak-May. The pre-monsoon flowers in Lachen are the local secret: ground orchids and primulas that only bloom in this two-week window before the heavy rain arrives. We sell this stretch as "off-peak Sikkim at peak-season weather" and it is one of the best-value bookings of the year.
Monsoon onset — usually between 15 and 25 June
The southwest monsoon hits Sikkim any time in the third week of June. The exact date varies year to year — 2024 was 17 June, 2023 was 22 June, 2022 was 19 June. The IMD declares onset based on rainfall over consecutive days plus wind patterns over the Bay of Bengal. Once it hits, rainfall jumps within days from May-level intensity to monsoon-level intensity. The Lohapool and Setijhora stretches on NH-10 (Bagdogra to Gangtok) start getting periodic slips. The Singtam-to-Mangan section becomes the bigger concern for North Sikkim trips.
Second half of June — committed monsoon
After 20 June, treat your trip as a monsoon trip (see our separate monsoon post for the full picture). North Sikkim becomes weather-dependent. The Tsomgo / Nathu La day trip from Gangtok runs but with reduced visibility. The Old Silk Route to Zuluk is not advisable. What stays open: Gangtok itself, Pelling, Ravangla, Namchi, Yuksom and Khecheopalri in West Sikkim, the Darjeeling tea-garden side. The light is dramatic. The greens are saturated. The crowds are gone. Hotel rates drop another 15 to 25 per cent compared to first-half June.
What is open in June
- First-half June: Everything — North Sikkim, Old Silk Route, all monasteries, all treks
- Second-half June: Gangtok, Pelling, Ravangla, Namchi, Yuksom, all monasteries, Darjeeling
- Second-half June at risk: North Sikkim (Lachen-Lachung-Gurudongmar), Old Silk Route, Goecha La trek (officially closed by 15 June)
- Pre-monsoon flowers in Lachen — first half only
- Second-flush Darjeeling tea harvest begins late May, continues through June and into July
Pricing in June
First-half June: mid-range Gangtok hotels at ₹5,500-7,500 (vs ₹9,500 in peak May). North Sikkim Bhutia lodges at ₹3,000-4,500 with meals. A 7N/8D private trip including North Sikkim runs ₹52,000 to ₹65,000 per person — about 20 per cent below May. Second-half June: hotels drop another 15-25 per cent. A pure West Sikkim trip (Gangtok, Pelling, Ravangla, Yuksom) runs ₹32,000 to ₹42,000 per person — close to the annual low.
What to pack
- Light layers for first half — t-shirts and shirts with one fleece for evenings
- Full rain shell — non-negotiable from 15 June onwards
- Quick-dry trousers and shirts — second half June
- Waterproof walking shoes or boots for monastery and trail walks
- Leech socks for the lower monastery trails after 15 June (Pelling-Pemayangtse, Yuksom-Dubdi, Khecheopalri)
- High-altitude layers (down jacket, gloves) if doing North Sikkim
- Insurance documents — for monsoon onset trips, trip-cancellation cover is essential