Monthly climate guide
Fresno weather in September
Expect very hot weather in Fresno in September: afternoons reach about 36°C (96°F), while nights drop to around 18°C (64°F). Around 1 mm of rain falls over the month (very dry), and skies are mostly sunny. Daytime highs are 4°C cooler than August and 7°C warmer than October.
What stands out in September
- It cools down fast from here: October is about 7°C cooler.
- Evenings cool off sharply: the daily range is around 18°C, so pack a layer.
- Rain is well below Fresno's usual level (around 96% less).
- In Fresno, September is early autumn.
Avg high
36°C
96°F
Avg low
18°C
64°F
Rainfall
1 mm
very dry
Humidity
33%
relative
Sky
19%
cloud · mostly sunny
Fresno weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 16°C / 62°F | 6°C / 42°F | 55 mm | 72% | 60% |
| February | 18°C / 64°F | 6°C / 42°F | 44 mm | 71% | 43% |
| March | 20°C / 69°F | 8°C / 46°F | 59 mm | 69% | 48% |
| April | 25°C / 77°F | 10°C / 50°F | 25 mm | 59% | 35% |
| May | 30°C / 85°F | 13°C / 55°F | 11 mm | 46% | 29% |
| June | 37°C / 98°F | 17°C / 63°F | 4 mm | 31% | 15% |
| July | 40°C / 105°F | 21°C / 69°F | 1 mm | 26% | 15% |
| August | 40°C / 103°F | 20°C / 69°F | 0 mm | 28% | 15% |
| September | 36°C / 96°F | 18°C / 64°F | 1 mm | 33% | 19% |
| October | 29°C / 84°F | 14°C / 56°F | 10 mm | 41% | 26% |
| November | 21°C / 70°F | 8°C / 47°F | 29 mm | 58% | 41% |
| December | 16°C / 60°F | 5°C / 41°F | 42 mm | 69% | 53% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- An extra layer — evenings are noticeably cooler than afternoons
- Sunglasses
Is September a good time to visit Fresno?
Compare the months in the chart above to find your ideal window.
Best time to visit Fresno →Other United States cities in September
Cite or embed this data
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Fresno weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/fresno/september
<a href="https://weathercompare.eu/weather/usa/fresno/september">Fresno weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/fresno" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Fresno weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/fresno/september">Fresno weather in September</a> – WeatherCompare</p>
Fresno in September: quick answers
Is September a good time to visit Fresno?
It can be, if you like heat: September highs in Fresno are around 36°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Fresno in September?
Average highs are about 36°C (96°F) and average lows about 18°C (64°F), based on 10 years of daily data.
Does it rain a lot in Fresno in September?
Fresno typically gets around 1 mm of rain in September — very dry.
Figures are long-term averages for the area around Fresno (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.