Lytton is known as Canada's Hot Spot and is often the hottest spot in Canada during the summer months. On 16 July 1941, the temperature reached a record 44.4°C (111.9°F).

Summer daytime shade temperatures regularly reach the mid to high 30°C 's (upper 90's to low 100°F's) and occasionally exceed 40°C (104°F).

Hot summer temperatures are made more tolerable by low humidity and Lytton usually enjoys clear blue skies and beautiful sunlight.

Lytton's location at the junction of the Fraser and Thompson Rivers is close to several sub-alpine plateaus and valleys, each with its own micro-climate. Biking, hiking, horse riding and other outdoor activities are available at cooler temperatures than town only a few minutes away, while rafting the rivers is always a refreshing break.

Lytton generally has short and mild winters with the January average temperature slightly below the freezing point. Annual precipitation is usually light, with some Pacific maritime influence. Precipitation is largely concentrated in the cooler half of the year.