Nepal Trekking Weather in May: Everest Base Camp vs Annapurna Temperature Data

Nepal Trekking Weather in May: Temperature Reality Check

May delivers Nepal's most reliable trekking conditions before monsoon rains arrive in June. Daytime temperatures at Everest Base Camp hover around 50°F (10°C), while Kathmandu sweats through 80°F (27°C) afternoons. This 30°F (17°C) spread across elevation zones makes route selection critical for comfort and safety.

Most trekking circuits experience their driest month in May, with Everest Base Camp recording just 0.8 inches (20mm) of precipitation and Annapurna Circuit averaging 1.2 inches (30mm). Clear skies dominate—expect visibility above 12 miles (19km) on 22-25 days of the month across major routes.

Everest Base Camp Weather Breakdown

Everest Base Camp at 17,598 feet (5,364m) maintains alpine conditions throughout May. Daytime temperatures range from 45-55°F (7-13°C), dropping to 15-25°F (-9 to -4°C) overnight. Namche Bazaar at 11,290 feet (3,441m) offers more moderate conditions: 55-65°F (13-18°C) during the day and 35-45°F (2-7°C) at night.

Wind speeds average 15-20 mph (24-32 km/h) above 16,000 feet (4,877m), with gusts reaching 35 mph (56 km/h). The jet stream typically moves off Everest's summit by late May, creating the brief weather windows that define climbing season.

Sunrise occurs around 5:15 AM, sunset around 6:45 PM. UV radiation intensifies dramatically with altitude—expect readings of 12-15 (extreme) above 14,000 feet (4,267m). Snow remains likely above 15,000 feet (4,572m), particularly during afternoon weather changes.

Lukla Flight Considerations

Lukla Airport experiences morning clarity followed by afternoon cloud buildup. Flights operate most reliably between 6:00-11:00 AM, when visibility exceeds 6 miles (10km) and cloud ceiling stays above 10,000 feet (3,048m). After noon, thermal activity creates turbulence and reduces visibility to 2-3 miles (3-5km).

Annapurna Circuit Temperature Patterns

The Annapurna Circuit spans greater elevation variation, creating more complex weather patterns. Pokhara starts the trek at 2,700 feet (823m) with humid subtropical conditions: 75-85°F (24-29°C) during the day and 60-70°F (16-21°C) at night. Humidity averages 65-70%, making afternoons genuinely uncomfortable for hiking.

Thorong La Pass at 17,769 feet (5,416m) delivers arctic conditions year-round. May temperatures range from 25-35°F (-4 to 2°C) during crossing hours (typically 5:00-9:00 AM) with wind chills dropping to 0°F (-18°C). Afternoon temperatures may reach 45°F (7°C) in direct sunlight, but weather deteriorates rapidly after 2:00 PM.

Manang at 11,519 feet (3,512m) provides acclimatization conditions similar to Namche: 50-60°F (10-16°C) days and 30-40°F (-1 to 4°C) nights. The rain shadow effect keeps precipitation under 0.6 inches (15mm) for the month.

Monsoon Approach Timing

Pre-monsoon conditions begin affecting Nepal trekking weather in May's final week. Afternoon thunderstorms increase in frequency, particularly in lower elevation zones below 8,000 feet (2,438m). These storms typically develop between 2:00-5:00 PM and dissipate by evening.

Weather windows shrink as June approaches. Early May offers 6-8 hour clear periods daily. By month's end, reliable weather lasts 4-6 hours, usually morning through early afternoon. The WeatherGO app provides hourly forecasts that help time high-altitude crossings during stable periods.

Regional Variations

Eastern Nepal (Everest region) stays drier longer than western circuits. Everest Base Camp typically experiences clear conditions until June 5-10, while Annapurna sees increased cloud cover starting May 25-30. Langtang Valley falls between these patterns, with weather degradation beginning around June 1-5.

Packing Requirements by Elevation Zone

Below 8,000 feet (2,438m): Lightweight hiking clothes, rain shell, temperatures 60-85°F (16-29°C). Synthetic materials dry faster in increasing humidity.

8,000-13,000 feet (2,438-3,962m): Layering system essential. Base layer, insulating layer, and waterproof shell. Temperature range 35-65°F (2-18°C) creates constant adjustment needs.

Above 13,000 feet (3,962m): Four-season gear required. Down insulation, insulated boots rated to -10°F (-23°C), expedition-weight gloves. Temperatures drop to 15°F (-9°C) regularly.

Sleeping bags rated to 0°F (-18°C) handle most teahouse conditions above 12,000 feet (3,658m). Wind-resistant outer layers become critical above treeline—approximately 12,500 feet (3,810m) in most regions.

Route-Specific Weather Windows

Everest Base Camp trek requires 12-16 clear days for safe completion. May typically delivers 18-22 suitable days, providing buffer for weather delays or acclimatization needs.

Annapurna Circuit needs 15-18 clear days, focusing on Thorong La crossing conditions. Pass closure occurs 3-5 days annually in May due to fresh snowfall or high winds above 40 mph (64 km/h).

Three Passes Trek demands 18-20 clear days with specific timing for Cho La, Kongma La, and Renjo La crossings. Each pass requires morning starts by 5:00 AM to avoid afternoon weather deterioration.

May provides Nepal's most predictable trekking weather, but altitude amplifies every temperature swing. Plan gear systems for 50°F (28°C) daily temperature ranges, pack layers obsessively, and book flights with buffer days for weather delays. The mountains set the schedule, not the calendar.