San Francisco weather in September (Riviera Nayarit, Mexico)
Planning a trip to San Francisco in September? Here's what the weather might have in store during this month.
In September, San Francisco generally has
very high temperatures
and heavy rainfall.
Throughout the day, temperatures typically settle at around 31°C.
But by evening, they drop to around 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.
San Francisco in September usually receives heavy rainfall, averaging around 254 mm for the month. In this month, the heaviest downpours of the year are not uncommon. Carrying a poncho might be your best bet to stay dry. Based on our climate data of the past 30 years, about 18 days of rain are anticipated.
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 in September and which places have the best weather conditions in this month.
perfect weather
pleasant
tolerable
unpleasant
poor
So, what should you wear in San Francisco in September?
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 in September.
Interested in more climate information?
Weather and Climate 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 climate conditions. Find out where to go with our weather planner.
