Monthly Climate
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Best time to visit Philadelphia

May is the best time to visit Philadelphia for general sightseeing, with average highs of 23 °C and about 11 wet days. The comfortable season runs roughly May to June.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking May comfort 88/100
The least cloud October 50 % average cloud cover
The least rain November 75 mm
Warmth July 30 °C
Cooler weather January 4.8 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 88 23 °C 11
2 September 87 25 °C 9
3 October 85 19 °C 8
4 June 78 27 °C 11
5 April 75 18 °C 10
6 August 73 29 °C 11
7 July 68 30 °C 11
8 November 60 13 °C 8
9 March 48 11 °C 10
10 December 36 7.3 °C 9
11 February 32 6.5 °C 9
12 January 31 4.8 °C 9

When to think twice

January scores lowest with about 9 wet days and highs near 4.8 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

Month Avg high Rainfall Cloud
January 4.8 °C 83 mm 58 %
February 6.5 °C 75 mm 57 %
March 11.0 °C 104 mm 59 %
April 17.5 °C 92 mm 59 %
May 22.6 °C 91 mm 60 %
June 27.4 °C 102 mm 58 %
July 30.1 °C 99 mm 54 %
August 28.9 °C 97 mm 53 %
September 25.2 °C 106 mm 52 %
October 18.8 °C 94 mm 50 %
November 12.6 °C 75 mm 55 %
December 7.3 °C 102 mm 59 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.