Early autumn · Weather & things to do
San Simeon in September
San Simeon's warmest month brings highs averaging 64°F (18°C), lows of 55°F (13°C) and about 0.2 in (4 mm) of rain.
At 89/100 for comfort (the top score of the year), it's one of the best months to visit.
- Avg high
- 64°F (18°C)
- Avg low
- 55°F (13°C)
- Rain
- 0.2 in (4 mm)
- Humidity
- 75%
- Cloud cover
- 59%
- Daylight
- ~12 h 13 min
- Comfort score
- 89/100 · Great
What September feels like
Days are mild at around 64°F (18°C): comfortable for walking all day, with a layer for the evening.
Lows average 55°F (13°C).
It's one of the drier stretches, with only about 0.2 in (4 mm) of rain.
Plan around September
September is one of San Simeon's best months on the climate data.
- Comfort improves from 83/100 in August to 89/100.
- September sits inside the Apr – Oct window our Pacific Coast Highway route recommends.
What to pack for September
- A warm layer for eveningsnights drop to 55°F
- Comfortable walking shoesmost picks involve some walking
What to do in San Simeon in September
September is good outdoor weather here, so these picks lean toward the open air.
Moonstone Beach Boardwalk
Mile-long boardwalk above a rocky shore with tidepools and otter sightings.
Why now September scores 89/100 for comfort, good conditions for being outside.
Hearst Ranch Winery
Tasting room in the historic Sebastian's building across from the beach.
Piedras Blancas Light Station
Guided tours of an 1875 lighthouse and its restored grounds.
Robin's Restaurant
Garden-patio restaurant in Cambria with global, seasonal plates.
Why now Highs near 64°F and 0.2 in of monthly rain make this an easy outdoor pick.
Fiscalini Ranch Preserve
Bluff trail and Monterey pine forest on the edge of Cambria.
Why now One to do outside while the weather is on your side.
Nearby in September
- Big Sur in September~54 mi · highs 69°F, 0.2 in rain · 3°C (5°F) warmer by day, about as wet
- Monterey & Carmel in September~75 mi · highs 69°F, 0.2 in rain · 3°C (6°F) warmer by day, about as wet
- Solvang in September~95 mi · highs 80°F, 0.1 in rain · 9°C (16°F) warmer by day, about as wet
- Santa Barbara in September~121 mi · highs 81°F, 0.1 in rain · 10°C (18°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~84 m to San Simeon's ~452 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
San Simeon in September: quick answers
Is September a good time to visit San Simeon?
Yes. On the climate data it's one of the best months, scoring 89/100. Expect highs of 64°F (18°C) and 0.2 in (4 mm) of rain. September is inside the Apr – Oct window our Pacific Coast Highway route recommends.
How cold is San Simeon in September?
Average highs are 64°F (18°C) and average lows 55°F (13°C), making it the warmest month by daytime highs.
Does it rain a lot in San Simeon in September?
Not much: about 0.2 in (4 mm) of rain falls across September on average, the 3rd-driest month of the year. The annual total is about 15.2 in (387 mm).
What should I pack for San Simeon in September?
Bring a warm layer for evenings (nights drop to 55°F) and comfortable walking shoes (most picks involve some walking).
More on San Simeon
Routes in season in September
- Pacific Coast Highway Apr – Oct
Planning San Simeon in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.