San Francisco weather in September (Riviera Nayarit, Mexico)
What should you pack for a trip to San Francisco in September? Discover if this is the best time for your journey with our detailed monthly weather breakdown.
Temperatures
During September, San Francisco usually has very high temperatures and heavy rainfall. As the day progresses, temperatures can peak at 31°C. Luckily at nightfall, they typically drop to 26°C.While these temperatures are typical, some days might be even hotter. Always be prepared for the unexpected spikes in warmth. Dressing in lightweight and breathable outfits will help you stay cool. Don't forget to stay hydrated and wear sun protection to handle the heat better.
Precipitation
San Francisco in September usually receives heavy rainfall, averaging around 254 mm for the month. The month brings the heaviest rain of the year, often in intense bursts. Make sure to have a poncho to stay dry during the showers. Historically, the month has about 18 days of rain.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit San Francisco. January, February, March, April, May, November and December typically offer the most optimal weather. In contrast, August and September tend to have less optimal conditions.
For an in-depth look at the yearly conditions, visit our specialized San Francisco climate page with graphs.
San Francisco, monthly averages in September
Min Temperature
26°C
Max Temperature
31°C
Chance of Rain
59%
Precipitation
254 mm
Rainy days
18 days
Humidity
70% *
Where to go in Mexico in September
Find out more about the weather in Mexico and which places have the best travel conditions in this month.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in this month?
It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case.What To Do
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Interested in more climate information?
This site provides you with all the information you need about the climate in San Francisco.
Our site offers climate and forecast data for every country in the world. Are you going to Mexico? On this website you can find historical weather averages for many cities in Mexico. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.
